* pl_exec.c - Executor for the PL/pgSQL
* procedural language
*
- * Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/pl/plpgsql/src/pl_exec.c,v 1.163 2006/04/04 19:35:37 tgl Exp $
+ * $PostgreSQL: pgsql/src/pl/plpgsql/src/pl_exec.c,v 1.249 2009/11/04 22:26:07 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include "plpgsql.h"
-#include "pl.tab.h"
#include <ctype.h>
-#include "access/heapam.h"
+#include "access/transam.h"
+#include "access/tupconvert.h"
#include "catalog/pg_proc.h"
#include "catalog/pg_type.h"
#include "executor/spi_priv.h"
#include "funcapi.h"
-#include "optimizer/clauses.h"
-#include "parser/parse_expr.h"
+#include "lib/stringinfo.h"
+#include "miscadmin.h"
+#include "nodes/nodeFuncs.h"
+#include "parser/parse_node.h"
+#include "parser/scansup.h"
+#include "storage/proc.h"
#include "tcop/tcopprot.h"
#include "utils/array.h"
#include "utils/builtins.h"
+#include "utils/datum.h"
#include "utils/lsyscache.h"
#include "utils/memutils.h"
+#include "utils/snapmgr.h"
#include "utils/typcache.h"
static const char *const raise_skip_msg = "RAISE";
+typedef struct
+{
+ int nargs; /* number of arguments */
+ Oid *types; /* types of arguments */
+ Datum *values; /* evaluated argument values */
+ char *nulls; /* null markers (' '/'n' style) */
+ bool *freevals; /* which arguments are pfree-able */
+} PreparedParamsData;
/*
- * All plpgsql function executions within a single transaction share
- * the same executor EState for evaluating "simple" expressions. Each
- * function call creates its own "eval_econtext" ExprContext within this
- * estate. We destroy the estate at transaction shutdown to ensure there
- * is no permanent leakage of memory (especially for xact abort case).
+ * All plpgsql function executions within a single transaction share the same
+ * executor EState for evaluating "simple" expressions. Each function call
+ * creates its own "eval_econtext" ExprContext within this estate for
+ * per-evaluation workspace. eval_econtext is freed at normal function exit,
+ * and the EState is freed at transaction end (in case of error, we assume
+ * that the abort mechanisms clean it all up). Furthermore, any exception
+ * block within a function has to have its own eval_econtext separate from
+ * the containing function's, so that we can clean up ExprContext callbacks
+ * properly at subtransaction exit. We maintain a stack that tracks the
+ * individual econtexts so that we can clean up correctly at subxact exit.
+ *
+ * This arrangement is a bit tedious to maintain, but it's worth the trouble
+ * so that we don't have to re-prepare simple expressions on each trip through
+ * a function. (We assume the case to optimize is many repetitions of a
+ * function within a transaction.)
*/
+typedef struct SimpleEcontextStackEntry
+{
+ ExprContext *stack_econtext; /* a stacked econtext */
+ SubTransactionId xact_subxid; /* ID for current subxact */
+ struct SimpleEcontextStackEntry *next; /* next stack entry up */
+} SimpleEcontextStackEntry;
+
static EState *simple_eval_estate = NULL;
+static SimpleEcontextStackEntry *simple_econtext_stack = NULL;
/************************************************************
* Local function forward declarations
PLpgSQL_stmt_getdiag *stmt);
static int exec_stmt_if(PLpgSQL_execstate *estate,
PLpgSQL_stmt_if *stmt);
+static int exec_stmt_case(PLpgSQL_execstate *estate,
+ PLpgSQL_stmt_case *stmt);
static int exec_stmt_loop(PLpgSQL_execstate *estate,
PLpgSQL_stmt_loop *stmt);
static int exec_stmt_while(PLpgSQL_execstate *estate,
PLpgSQL_stmt_fori *stmt);
static int exec_stmt_fors(PLpgSQL_execstate *estate,
PLpgSQL_stmt_fors *stmt);
-static int exec_stmt_select(PLpgSQL_execstate *estate,
- PLpgSQL_stmt_select *stmt);
+static int exec_stmt_forc(PLpgSQL_execstate *estate,
+ PLpgSQL_stmt_forc *stmt);
static int exec_stmt_open(PLpgSQL_execstate *estate,
PLpgSQL_stmt_open *stmt);
static int exec_stmt_fetch(PLpgSQL_execstate *estate,
PLpgSQL_stmt_return *stmt);
static int exec_stmt_return_next(PLpgSQL_execstate *estate,
PLpgSQL_stmt_return_next *stmt);
+static int exec_stmt_return_query(PLpgSQL_execstate *estate,
+ PLpgSQL_stmt_return_query *stmt);
static int exec_stmt_raise(PLpgSQL_execstate *estate,
PLpgSQL_stmt_raise *stmt);
static int exec_stmt_execsql(PLpgSQL_execstate *estate,
static void exec_eval_cleanup(PLpgSQL_execstate *estate);
static void exec_prepare_plan(PLpgSQL_execstate *estate,
- PLpgSQL_expr *expr);
+ PLpgSQL_expr *expr, int cursorOptions);
static bool exec_simple_check_node(Node *node);
static void exec_simple_check_plan(PLpgSQL_expr *expr);
-static Datum exec_eval_simple_expr(PLpgSQL_execstate *estate,
+static bool exec_eval_simple_expr(PLpgSQL_execstate *estate,
PLpgSQL_expr *expr,
+ Datum *result,
bool *isNull,
Oid *rettype);
Datum value, Oid valtype, bool *isNull);
static void exec_eval_datum(PLpgSQL_execstate *estate,
PLpgSQL_datum *datum,
- Oid expectedtypeid,
Oid *typeid,
Datum *value,
bool *isnull);
+static Oid exec_get_datum_type(PLpgSQL_execstate *estate,
+ PLpgSQL_datum *datum);
static int exec_eval_integer(PLpgSQL_execstate *estate,
PLpgSQL_expr *expr,
bool *isNull);
Oid *rettype);
static int exec_run_select(PLpgSQL_execstate *estate,
PLpgSQL_expr *expr, long maxtuples, Portal *portalP);
+static int exec_for_query(PLpgSQL_execstate *estate, PLpgSQL_stmt_forq *stmt,
+ Portal portal, bool prefetch_ok);
+static ParamListInfo setup_param_list(PLpgSQL_execstate *estate,
+ PLpgSQL_expr *expr);
+static void plpgsql_parser_setup(ParseState *pstate, PLpgSQL_expr *expr);
+static Node *plpgsql_param_ref(ParseState *pstate, ParamRef *pref);
+static void plpgsql_param_fetch(ParamListInfo params, int paramid);
static void exec_move_row(PLpgSQL_execstate *estate,
PLpgSQL_rec *rec,
PLpgSQL_row *row,
Oid reqtype, int32 reqtypmod,
bool isnull);
static void exec_init_tuple_store(PLpgSQL_execstate *estate);
-static bool compatible_tupdesc(TupleDesc td1, TupleDesc td2);
static void exec_set_found(PLpgSQL_execstate *estate, bool state);
+static void plpgsql_create_econtext(PLpgSQL_execstate *estate);
+static void plpgsql_destroy_econtext(PLpgSQL_execstate *estate);
static void free_var(PLpgSQL_var *var);
+static void assign_text_var(PLpgSQL_var *var, const char *str);
+static PreparedParamsData *exec_eval_using_params(PLpgSQL_execstate *estate,
+ List *params);
+static void free_params_data(PreparedParamsData *ppd);
+static Portal exec_dynquery_with_params(PLpgSQL_execstate *estate,
+ PLpgSQL_expr *query, List *params);
/* ----------
tmptup.t_tableOid = InvalidOid;
tmptup.t_data = td;
exec_move_row(&estate, NULL, row, &tmptup, tupdesc);
+ ReleaseTupleDesc(tupdesc);
}
else
{
}
}
+ estate.err_text = gettext_noop("during function entry");
+
/*
* Set the magic variable FOUND to false
*/
exec_set_found(&estate, false);
+ /*
+ * Let the instrumentation plugin peek at this function
+ */
+ if (*plugin_ptr && (*plugin_ptr)->func_beg)
+ ((*plugin_ptr)->func_beg) (&estate, func);
+
/*
* Now call the toplevel block of statements
*/
estate.err_text = NULL;
/*
- * Provide a more helpful message if a CONTINUE has been used outside
- * a loop.
+ * Provide a more helpful message if a CONTINUE or RAISE has been used
+ * outside the context it can work in.
*/
if (rc == PLPGSQL_RC_CONTINUE)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("CONTINUE cannot be used outside a loop")));
+ else if (rc == PLPGSQL_RC_RERAISE)
+ ereport(ERROR,
+ (errcode(ERRCODE_SYNTAX_ERROR),
+ errmsg("RAISE without parameters cannot be used outside an exception handler")));
else
ereport(ERROR,
(errcode(ERRCODE_S_R_E_FUNCTION_EXECUTED_NO_RETURN_STATEMENT),
if (estate.retistuple)
{
/*
- * We have to check that the returned tuple actually matches
- * the expected result type. XXX would be better to cache the
- * tupdesc instead of repeating get_call_result_type()
+ * We have to check that the returned tuple actually matches the
+ * expected result type. XXX would be better to cache the tupdesc
+ * instead of repeating get_call_result_type()
*/
+ HeapTuple rettup = (HeapTuple) DatumGetPointer(estate.retval);
TupleDesc tupdesc;
+ TupleConversionMap *tupmap;
switch (get_call_result_type(fcinfo, NULL, &tupdesc))
{
case TYPEFUNC_COMPOSITE:
/* got the expected result rowtype, now check it */
- if (estate.rettupdesc == NULL ||
- !compatible_tupdesc(estate.rettupdesc, tupdesc))
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("returned record type does not match expected record type")));
+ tupmap = convert_tuples_by_position(estate.rettupdesc,
+ tupdesc,
+ gettext_noop("returned record type does not match expected record type"));
+ /* it might need conversion */
+ if (tupmap)
+ rettup = do_convert_tuple(rettup, tupmap);
+ /* no need to free map, we're about to return anyway */
break;
case TYPEFUNC_RECORD:
+
/*
* Failed to determine actual type of RECORD. We could
- * raise an error here, but what this means in practice
- * is that the caller is expecting any old generic
- * rowtype, so we don't really need to be restrictive.
- * Pass back the generated result type, instead.
+ * raise an error here, but what this means in practice is
+ * that the caller is expecting any old generic rowtype,
+ * so we don't really need to be restrictive. Pass back
+ * the generated result type, instead.
*/
tupdesc = estate.rettupdesc;
if (tupdesc == NULL) /* shouldn't happen */
}
/*
- * Copy tuple to upper executor memory, as a tuple Datum.
- * Make sure it is labeled with the caller-supplied tuple type.
+ * Copy tuple to upper executor memory, as a tuple Datum. Make
+ * sure it is labeled with the caller-supplied tuple type.
*/
- estate.retval =
- PointerGetDatum(SPI_returntuple((HeapTuple) (estate.retval),
- tupdesc));
+ estate.retval = PointerGetDatum(SPI_returntuple(rettup, tupdesc));
}
else
{
void *tmp;
len = datumGetSize(estate.retval, false, func->fn_rettyplen);
- tmp = (void *) SPI_palloc(len);
+ tmp = SPI_palloc(len);
memcpy(tmp, DatumGetPointer(estate.retval), len);
estate.retval = PointerGetDatum(tmp);
}
}
}
+ estate.err_text = gettext_noop("during function exit");
+
+ /*
+ * Let the instrumentation plugin peek at this function
+ */
+ if (*plugin_ptr && (*plugin_ptr)->func_end)
+ ((*plugin_ptr)->func_end) (&estate, func);
+
/* Clean up any leftover temporary memory */
- FreeExprContext(estate.eval_econtext);
- estate.eval_econtext = NULL;
+ plpgsql_destroy_econtext(&estate);
exec_eval_cleanup(&estate);
/*
/*
* Put the OLD and NEW tuples into record variables
+ *
+ * We make the tupdescs available in both records even though only one
+ * may have a value. This allows parsing of record references to succeed
+ * in functions that are used for multiple trigger types. For example,
+ * we might have a test like "if (TG_OP = 'INSERT' and NEW.foo = 'xyz')",
+ * which should parse regardless of the current trigger type.
*/
rec_new = (PLpgSQL_rec *) (estate.datums[func->new_varno]);
rec_new->freetup = false;
+ rec_new->tupdesc = trigdata->tg_relation->rd_att;
rec_new->freetupdesc = false;
rec_old = (PLpgSQL_rec *) (estate.datums[func->old_varno]);
rec_old->freetup = false;
+ rec_old->tupdesc = trigdata->tg_relation->rd_att;
rec_old->freetupdesc = false;
if (TRIGGER_FIRED_FOR_STATEMENT(trigdata->tg_event))
* Per-statement triggers don't use OLD/NEW variables
*/
rec_new->tup = NULL;
- rec_new->tupdesc = NULL;
rec_old->tup = NULL;
- rec_old->tupdesc = NULL;
}
else if (TRIGGER_FIRED_BY_INSERT(trigdata->tg_event))
{
rec_new->tup = trigdata->tg_trigtuple;
- rec_new->tupdesc = trigdata->tg_relation->rd_att;
rec_old->tup = NULL;
- rec_old->tupdesc = NULL;
}
else if (TRIGGER_FIRED_BY_UPDATE(trigdata->tg_event))
{
rec_new->tup = trigdata->tg_newtuple;
- rec_new->tupdesc = trigdata->tg_relation->rd_att;
rec_old->tup = trigdata->tg_trigtuple;
- rec_old->tupdesc = trigdata->tg_relation->rd_att;
}
else if (TRIGGER_FIRED_BY_DELETE(trigdata->tg_event))
{
rec_new->tup = NULL;
- rec_new->tupdesc = NULL;
rec_old->tup = trigdata->tg_trigtuple;
- rec_old->tupdesc = trigdata->tg_relation->rd_att;
}
else
elog(ERROR, "unrecognized trigger action: not INSERT, DELETE, or UPDATE");
var = (PLpgSQL_var *) (estate.datums[func->tg_op_varno]);
if (TRIGGER_FIRED_BY_INSERT(trigdata->tg_event))
- var->value = DirectFunctionCall1(textin, CStringGetDatum("INSERT"));
+ var->value = CStringGetTextDatum("INSERT");
else if (TRIGGER_FIRED_BY_UPDATE(trigdata->tg_event))
- var->value = DirectFunctionCall1(textin, CStringGetDatum("UPDATE"));
+ var->value = CStringGetTextDatum("UPDATE");
else if (TRIGGER_FIRED_BY_DELETE(trigdata->tg_event))
- var->value = DirectFunctionCall1(textin, CStringGetDatum("DELETE"));
+ var->value = CStringGetTextDatum("DELETE");
+ else if (TRIGGER_FIRED_BY_TRUNCATE(trigdata->tg_event))
+ var->value = CStringGetTextDatum("TRUNCATE");
else
- elog(ERROR, "unrecognized trigger action: not INSERT, DELETE, or UPDATE");
+ elog(ERROR, "unrecognized trigger action: not INSERT, DELETE, UPDATE, or TRUNCATE");
var->isnull = false;
var->freeval = true;
var = (PLpgSQL_var *) (estate.datums[func->tg_when_varno]);
if (TRIGGER_FIRED_BEFORE(trigdata->tg_event))
- var->value = DirectFunctionCall1(textin, CStringGetDatum("BEFORE"));
+ var->value = CStringGetTextDatum("BEFORE");
else if (TRIGGER_FIRED_AFTER(trigdata->tg_event))
- var->value = DirectFunctionCall1(textin, CStringGetDatum("AFTER"));
+ var->value = CStringGetTextDatum("AFTER");
else
elog(ERROR, "unrecognized trigger execution time: not BEFORE or AFTER");
var->isnull = false;
var = (PLpgSQL_var *) (estate.datums[func->tg_level_varno]);
if (TRIGGER_FIRED_FOR_ROW(trigdata->tg_event))
- var->value = DirectFunctionCall1(textin, CStringGetDatum("ROW"));
+ var->value = CStringGetTextDatum("ROW");
else if (TRIGGER_FIRED_FOR_STATEMENT(trigdata->tg_event))
- var->value = DirectFunctionCall1(textin, CStringGetDatum("STATEMENT"));
+ var->value = CStringGetTextDatum("STATEMENT");
else
elog(ERROR, "unrecognized trigger event type: not ROW or STATEMENT");
var->isnull = false;
var->isnull = false;
var->freeval = true;
+ var = (PLpgSQL_var *) (estate.datums[func->tg_table_name_varno]);
+ var->value = DirectFunctionCall1(namein,
+ CStringGetDatum(RelationGetRelationName(trigdata->tg_relation)));
+ var->isnull = false;
+ var->freeval = true;
+
+ var = (PLpgSQL_var *) (estate.datums[func->tg_table_schema_varno]);
+ var->value = DirectFunctionCall1(namein,
+ CStringGetDatum(
+ get_namespace_name(
+ RelationGetNamespace(
+ trigdata->tg_relation))));
+ var->isnull = false;
+ var->freeval = true;
+
var = (PLpgSQL_var *) (estate.datums[func->tg_nargs_varno]);
var->value = Int16GetDatum(trigdata->tg_trigger->tgnargs);
var->isnull = false;
var->freeval = false;
- /*
- * Store the trigger argument values into the special execution state
- * variables
- */
- estate.err_text = gettext_noop("while storing call arguments into local variables");
- estate.trig_nargs = trigdata->tg_trigger->tgnargs;
- if (estate.trig_nargs == 0)
- estate.trig_argv = NULL;
+ var = (PLpgSQL_var *) (estate.datums[func->tg_argv_varno]);
+ if (trigdata->tg_trigger->tgnargs > 0)
+ {
+ /*
+ * For historical reasons, tg_argv[] subscripts start at zero not one.
+ * So we can't use construct_array().
+ */
+ int nelems = trigdata->tg_trigger->tgnargs;
+ Datum *elems;
+ int dims[1];
+ int lbs[1];
+
+ elems = palloc(sizeof(Datum) * nelems);
+ for (i = 0; i < nelems; i++)
+ elems[i] = CStringGetTextDatum(trigdata->tg_trigger->tgargs[i]);
+ dims[0] = nelems;
+ lbs[0] = 0;
+
+ var->value = PointerGetDatum(construct_md_array(elems, NULL,
+ 1, dims, lbs,
+ TEXTOID,
+ -1, false, 'i'));
+ var->isnull = false;
+ var->freeval = true;
+ }
else
{
- estate.trig_argv = palloc(sizeof(Datum) * estate.trig_nargs);
- for (i = 0; i < trigdata->tg_trigger->tgnargs; i++)
- estate.trig_argv[i] = DirectFunctionCall1(textin,
- CStringGetDatum(trigdata->tg_trigger->tgargs[i]));
+ var->value = (Datum) 0;
+ var->isnull = true;
+ var->freeval = false;
}
+ estate.err_text = gettext_noop("during function entry");
+
/*
* Set the magic variable FOUND to false
*/
exec_set_found(&estate, false);
+ /*
+ * Let the instrumentation plugin peek at this function
+ */
+ if (*plugin_ptr && (*plugin_ptr)->func_beg)
+ ((*plugin_ptr)->func_beg) (&estate, func);
+
/*
* Now call the toplevel block of statements
*/
estate.err_text = NULL;
/*
- * Provide a more helpful message if a CONTINUE has been used outside
- * a loop.
+ * Provide a more helpful message if a CONTINUE or RAISE has been used
+ * outside the context it can work in.
*/
if (rc == PLPGSQL_RC_CONTINUE)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("CONTINUE cannot be used outside a loop")));
+ else if (rc == PLPGSQL_RC_RERAISE)
+ ereport(ERROR,
+ (errcode(ERRCODE_SYNTAX_ERROR),
+ errmsg("RAISE without parameters cannot be used outside an exception handler")));
else
ereport(ERROR,
(errcode(ERRCODE_S_R_E_FUNCTION_EXECUTED_NO_RETURN_STATEMENT),
errmsg("control reached end of trigger procedure without RETURN")));
}
+ estate.err_stmt = NULL;
+ estate.err_text = gettext_noop("during function exit");
+
if (estate.retisset)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
rettup = NULL;
else
{
- if (!compatible_tupdesc(estate.rettupdesc,
- trigdata->tg_relation->rd_att))
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("returned tuple structure does not match table of trigger event")));
+ TupleConversionMap *tupmap;
+
+ rettup = (HeapTuple) DatumGetPointer(estate.retval);
+ /* check rowtype compatibility */
+ tupmap = convert_tuples_by_position(estate.rettupdesc,
+ trigdata->tg_relation->rd_att,
+ gettext_noop("returned row structure does not match the structure of the triggering table"));
+ /* it might need conversion */
+ if (tupmap)
+ rettup = do_convert_tuple(rettup, tupmap);
+ /* no need to free map, we're about to return anyway */
+
/* Copy tuple to upper executor memory */
- rettup = SPI_copytuple((HeapTuple) (estate.retval));
+ rettup = SPI_copytuple(rettup);
}
+ /*
+ * Let the instrumentation plugin peek at this function
+ */
+ if (*plugin_ptr && (*plugin_ptr)->func_end)
+ ((*plugin_ptr)->func_end) (&estate, func);
+
/* Clean up any leftover temporary memory */
- FreeExprContext(estate.eval_econtext);
- estate.eval_econtext = NULL;
+ plpgsql_destroy_econtext(&estate);
exec_eval_cleanup(&estate);
/*
{
PLpgSQL_execstate *estate = (PLpgSQL_execstate *) arg;
- /* safety check, shouldn't happen */
- if (estate->err_func == NULL)
- return;
-
/* if we are doing RAISE, don't report its location */
if (estate->err_text == raise_skip_msg)
return;
- if (estate->err_stmt != NULL)
- {
- /* translator: last %s is a plpgsql statement type name */
- errcontext("PL/pgSQL function \"%s\" line %d at %s",
- estate->err_func->fn_name,
- estate->err_stmt->lineno,
- plpgsql_stmt_typename(estate->err_stmt));
- }
- else if (estate->err_text != NULL)
+ if (estate->err_text != NULL)
{
/*
* We don't expend the cycles to run gettext() on err_text unless we
* actually need it. Therefore, places that set up err_text should
* use gettext_noop() to ensure the strings get recorded in the
* message dictionary.
+ *
+ * If both err_text and err_stmt are set, use the err_text as
+ * description, but report the err_stmt's line number. When err_stmt
+ * is not set, we're in function entry/exit, or some such place not
+ * attached to a specific line number.
*/
-
- /*
- * translator: last %s is a phrase such as "while storing call
- * arguments into local variables"
- */
- errcontext("PL/pgSQL function \"%s\" %s",
- estate->err_func->fn_name,
- gettext(estate->err_text));
+ if (estate->err_stmt != NULL)
+ {
+ /*
+ * translator: last %s is a phrase such as "during statement block
+ * local variable initialization"
+ */
+ errcontext("PL/pgSQL function \"%s\" line %d %s",
+ estate->func->fn_name,
+ estate->err_stmt->lineno,
+ _(estate->err_text));
+ }
+ else
+ {
+ /*
+ * translator: last %s is a phrase such as "while storing call
+ * arguments into local variables"
+ */
+ errcontext("PL/pgSQL function \"%s\" %s",
+ estate->func->fn_name,
+ _(estate->err_text));
+ }
+ }
+ else if (estate->err_stmt != NULL)
+ {
+ /* translator: last %s is a plpgsql statement type name */
+ errcontext("PL/pgSQL function \"%s\" line %d at %s",
+ estate->func->fn_name,
+ estate->err_stmt->lineno,
+ plpgsql_stmt_typename(estate->err_stmt));
}
else
errcontext("PL/pgSQL function \"%s\"",
- estate->err_func->fn_name);
+ estate->func->fn_name);
}
case PLPGSQL_DTYPE_ROW:
case PLPGSQL_DTYPE_RECFIELD:
case PLPGSQL_DTYPE_ARRAYELEM:
- case PLPGSQL_DTYPE_TRIGARG:
/*
* These datum records are read-only at runtime, so no need to
/*
* First initialize all variables declared in this block
*/
+ estate->err_text = gettext_noop("during statement block local variable initialization");
+
for (i = 0; i < block->n_initvars; i++)
{
n = block->initvarnos[i];
{
PLpgSQL_var *var = (PLpgSQL_var *) (estate->datums[n]);
+ /* free any old value, in case re-entering block */
free_var(var);
- if (!var->isconst || var->isnull)
+
+ /* Initially it contains a NULL */
+ var->value = (Datum) 0;
+ var->isnull = true;
+
+ if (var->default_val == NULL)
{
- if (var->default_val == NULL)
+ /*
+ * If needed, give the datatype a chance to reject
+ * NULLs, by assigning a NULL to the variable. We
+ * claim the value is of type UNKNOWN, not the var's
+ * datatype, else coercion will be skipped. (Do this
+ * before the notnull check to be consistent with
+ * exec_assign_value.)
+ */
+ if (!var->datatype->typinput.fn_strict)
{
- var->value = (Datum) 0;
- var->isnull = true;
- if (var->notnull)
- ereport(ERROR,
+ bool valIsNull = true;
+
+ exec_assign_value(estate,
+ (PLpgSQL_datum *) var,
+ (Datum) 0,
+ UNKNOWNOID,
+ &valIsNull);
+ }
+ if (var->notnull)
+ ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
errmsg("variable \"%s\" declared NOT NULL cannot default to NULL",
var->refname)));
- }
- else
- {
- exec_assign_expr(estate, (PLpgSQL_datum *) var,
- var->default_val);
- }
+ }
+ else
+ {
+ exec_assign_expr(estate, (PLpgSQL_datum *) var,
+ var->default_val);
}
}
break;
if (rec->freetup)
{
heap_freetuple(rec->tup);
- FreeTupleDesc(rec->tupdesc);
rec->freetup = false;
}
-
+ if (rec->freetupdesc)
+ {
+ FreeTupleDesc(rec->tupdesc);
+ rec->freetupdesc = false;
+ }
rec->tup = NULL;
rec->tupdesc = NULL;
}
*/
MemoryContext oldcontext = CurrentMemoryContext;
ResourceOwner oldowner = CurrentResourceOwner;
+ ExprContext *old_eval_econtext = estate->eval_econtext;
+
+ estate->err_text = gettext_noop("during statement block entry");
BeginInternalSubTransaction(NULL);
/* Want to run statements inside function's memory context */
PG_TRY();
{
+ /*
+ * We need to run the block's statements with a new eval_econtext
+ * that belongs to the current subtransaction; if we try to use
+ * the outer econtext then ExprContext shutdown callbacks will be
+ * called at the wrong times.
+ */
+ plpgsql_create_econtext(estate);
+
+ estate->err_text = NULL;
+
+ /* Run the block's statements */
rc = exec_stmts(estate, block->body);
+ estate->err_text = gettext_noop("during statement block exit");
+
+ /*
+ * If the block ended with RETURN, we may need to copy the return
+ * value out of the subtransaction eval_context. This is
+ * currently only needed for scalar result types --- rowtype
+ * values will always exist in the function's own memory context.
+ */
+ if (rc == PLPGSQL_RC_RETURN &&
+ !estate->retisset &&
+ !estate->retisnull &&
+ estate->rettupdesc == NULL)
+ {
+ int16 resTypLen;
+ bool resTypByVal;
+
+ get_typlenbyval(estate->rettype, &resTypLen, &resTypByVal);
+ estate->retval = datumCopy(estate->retval,
+ resTypByVal, resTypLen);
+ }
+
/* Commit the inner transaction, return to outer xact context */
ReleaseCurrentSubTransaction();
MemoryContextSwitchTo(oldcontext);
CurrentResourceOwner = oldowner;
+ /*
+ * Revert to outer eval_econtext. (The inner one was
+ * automatically cleaned up during subxact exit.)
+ */
+ estate->eval_econtext = old_eval_econtext;
+
/*
* AtEOSubXact_SPI() should not have popped any SPI context, but
* just in case it did, make sure we remain connected.
ErrorData *edata;
ListCell *e;
+ estate->err_text = gettext_noop("during exception cleanup");
+
/* Save error info */
MemoryContextSwitchTo(oldcontext);
edata = CopyErrorData();
MemoryContextSwitchTo(oldcontext);
CurrentResourceOwner = oldowner;
+ /* Revert to outer eval_econtext */
+ estate->eval_econtext = old_eval_econtext;
+
/*
* If AtEOSubXact_SPI() popped any SPI context of the subxact, it
* will have left us in a disconnected state. We need this hack
state_var = (PLpgSQL_var *)
estate->datums[block->exceptions->sqlstate_varno];
- state_var->value = DirectFunctionCall1(textin,
- CStringGetDatum(unpack_sql_state(edata->sqlerrcode)));
- state_var->freeval = true;
- state_var->isnull = false;
-
errm_var = (PLpgSQL_var *)
estate->datums[block->exceptions->sqlerrm_varno];
- errm_var->value = DirectFunctionCall1(textin,
- CStringGetDatum(edata->message));
- errm_var->freeval = true;
- errm_var->isnull = false;
+
+ assign_text_var(state_var,
+ unpack_sql_state(edata->sqlerrcode));
+ assign_text_var(errm_var, edata->message);
+
+ estate->err_text = NULL;
rc = exec_stmts(estate, exception->action);
free_var(state_var);
+ state_var->value = (Datum) 0;
+ state_var->isnull = true;
free_var(errm_var);
+ errm_var->value = (Datum) 0;
+ errm_var->isnull = true;
+
+ /* re-throw error if requested by handler */
+ if (rc == PLPGSQL_RC_RERAISE)
+ ReThrowError(edata);
+
break;
}
}
/*
* Just execute the statements in the block's body
*/
+ estate->err_text = NULL;
+
rc = exec_stmts(estate, block->body);
}
+ estate->err_text = NULL;
+
/*
* Handle the return code.
*/
switch (rc)
{
case PLPGSQL_RC_OK:
- case PLPGSQL_RC_CONTINUE:
case PLPGSQL_RC_RETURN:
+ case PLPGSQL_RC_CONTINUE:
+ case PLPGSQL_RC_RERAISE:
return rc;
case PLPGSQL_RC_EXIT:
+
+ /*
+ * This is intentionally different from the handling of RC_EXIT
+ * for loops: to match a block, we require a match by label.
+ */
if (estate->exitlabel == NULL)
- return PLPGSQL_RC_OK;
+ return PLPGSQL_RC_EXIT;
if (block->label == NULL)
return PLPGSQL_RC_EXIT;
- if (strcmp(block->label, estate->exitlabel))
+ if (strcmp(block->label, estate->exitlabel) != 0)
return PLPGSQL_RC_EXIT;
estate->exitlabel = NULL;
return PLPGSQL_RC_OK;
save_estmt = estate->err_stmt;
estate->err_stmt = stmt;
+ /* Let the plugin know that we are about to execute this statement */
+ if (*plugin_ptr && (*plugin_ptr)->stmt_beg)
+ ((*plugin_ptr)->stmt_beg) (estate, stmt);
+
CHECK_FOR_INTERRUPTS();
- switch (stmt->cmd_type)
+ switch ((enum PLpgSQL_stmt_types) stmt->cmd_type)
{
case PLPGSQL_STMT_BLOCK:
rc = exec_stmt_block(estate, (PLpgSQL_stmt_block *) stmt);
rc = exec_stmt_if(estate, (PLpgSQL_stmt_if *) stmt);
break;
+ case PLPGSQL_STMT_CASE:
+ rc = exec_stmt_case(estate, (PLpgSQL_stmt_case *) stmt);
+ break;
+
case PLPGSQL_STMT_LOOP:
rc = exec_stmt_loop(estate, (PLpgSQL_stmt_loop *) stmt);
break;
rc = exec_stmt_fors(estate, (PLpgSQL_stmt_fors *) stmt);
break;
- case PLPGSQL_STMT_SELECT:
- rc = exec_stmt_select(estate, (PLpgSQL_stmt_select *) stmt);
+ case PLPGSQL_STMT_FORC:
+ rc = exec_stmt_forc(estate, (PLpgSQL_stmt_forc *) stmt);
break;
case PLPGSQL_STMT_EXIT:
rc = exec_stmt_return_next(estate, (PLpgSQL_stmt_return_next *) stmt);
break;
+ case PLPGSQL_STMT_RETURN_QUERY:
+ rc = exec_stmt_return_query(estate, (PLpgSQL_stmt_return_query *) stmt);
+ break;
+
case PLPGSQL_STMT_RAISE:
rc = exec_stmt_raise(estate, (PLpgSQL_stmt_raise *) stmt);
break;
elog(ERROR, "unrecognized cmdtype: %d", stmt->cmd_type);
}
+ /* Let the plugin know that we have finished executing this statement */
+ if (*plugin_ptr && (*plugin_ptr)->stmt_end)
+ ((*plugin_ptr)->stmt_end) (estate, stmt);
+
estate->err_stmt = save_estmt;
return rc;
}
+/*-----------
+ * exec_stmt_case
+ *-----------
+ */
+static int
+exec_stmt_case(PLpgSQL_execstate *estate, PLpgSQL_stmt_case *stmt)
+{
+ PLpgSQL_var *t_var = NULL;
+ bool isnull;
+ ListCell *l;
+
+ if (stmt->t_expr != NULL)
+ {
+ /* simple case */
+ Datum t_val;
+ Oid t_oid;
+
+ t_val = exec_eval_expr(estate, stmt->t_expr, &isnull, &t_oid);
+
+ t_var = (PLpgSQL_var *) estate->datums[stmt->t_varno];
+
+ /*
+ * When expected datatype is different from real, change it. Note that
+ * what we're modifying here is an execution copy of the datum, so
+ * this doesn't affect the originally stored function parse tree.
+ */
+ if (t_var->datatype->typoid != t_oid)
+ t_var->datatype = plpgsql_build_datatype(t_oid, -1);
+
+ /* now we can assign to the variable */
+ exec_assign_value(estate,
+ (PLpgSQL_datum *) t_var,
+ t_val,
+ t_oid,
+ &isnull);
+
+ exec_eval_cleanup(estate);
+ }
+
+ /* Now search for a successful WHEN clause */
+ foreach(l, stmt->case_when_list)
+ {
+ PLpgSQL_case_when *cwt = (PLpgSQL_case_when *) lfirst(l);
+ bool value;
+
+ value = exec_eval_boolean(estate, cwt->expr, &isnull);
+ exec_eval_cleanup(estate);
+ if (!isnull && value)
+ {
+ /* Found it */
+
+ /* We can now discard any value we had for the temp variable */
+ if (t_var != NULL)
+ {
+ free_var(t_var);
+ t_var->value = (Datum) 0;
+ t_var->isnull = true;
+ }
+
+ /* Evaluate the statement(s), and we're done */
+ return exec_stmts(estate, cwt->stmts);
+ }
+ }
+
+ /* We can now discard any value we had for the temp variable */
+ if (t_var != NULL)
+ {
+ free_var(t_var);
+ t_var->value = (Datum) 0;
+ t_var->isnull = true;
+ }
+
+ /* SQL2003 mandates this error if there was no ELSE clause */
+ if (!stmt->have_else)
+ ereport(ERROR,
+ (errcode(ERRCODE_CASE_NOT_FOUND),
+ errmsg("case not found"),
+ errhint("CASE statement is missing ELSE part.")));
+
+ /* Evaluate the ELSE statements, and we're done */
+ return exec_stmts(estate, stmt->else_stmts);
+}
+
+
/* ----------
* exec_stmt_loop Loop over statements until
* an exit occurs.
break;
case PLPGSQL_RC_RETURN:
- return PLPGSQL_RC_RETURN;
+ case PLPGSQL_RC_RERAISE:
+ return rc;
default:
elog(ERROR, "unrecognized rc: %d", rc);
return PLPGSQL_RC_OK;
if (stmt->label == NULL)
return PLPGSQL_RC_EXIT;
- if (strcmp(stmt->label, estate->exitlabel))
+ if (strcmp(stmt->label, estate->exitlabel) != 0)
return PLPGSQL_RC_EXIT;
estate->exitlabel = NULL;
return PLPGSQL_RC_OK;
break;
case PLPGSQL_RC_RETURN:
- return PLPGSQL_RC_RETURN;
+ case PLPGSQL_RC_RERAISE:
+ return rc;
default:
elog(ERROR, "unrecognized rc: %d", rc);
/* ----------
* exec_stmt_fori Iterate an integer variable
- * from a lower to an upper value.
- * Loop can be left with exit.
+ * from a lower to an upper value
+ * incrementing or decrementing by the BY value
* ----------
*/
static int
{
PLpgSQL_var *var;
Datum value;
- Oid valtype;
bool isnull;
+ Oid valtype;
+ int32 loop_value;
+ int32 end_value;
+ int32 step_value;
bool found = false;
int rc = PLPGSQL_RC_OK;
- var = (PLpgSQL_var *) (estate->datums[stmt->var->varno]);
+ var = (PLpgSQL_var *) (estate->datums[stmt->var->dno]);
/*
- * Get the value of the lower bound into the loop var
+ * Get the value of the lower bound
*/
value = exec_eval_expr(estate, stmt->lower, &isnull, &valtype);
value = exec_cast_value(value, valtype, var->datatype->typoid,
if (isnull)
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
- errmsg("lower bound of FOR loop cannot be NULL")));
- var->value = value;
- var->isnull = false;
+ errmsg("lower bound of FOR loop cannot be null")));
+ loop_value = DatumGetInt32(value);
exec_eval_cleanup(estate);
/*
if (isnull)
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
- errmsg("upper bound of FOR loop cannot be NULL")));
+ errmsg("upper bound of FOR loop cannot be null")));
+ end_value = DatumGetInt32(value);
exec_eval_cleanup(estate);
+ /*
+ * Get the step value
+ */
+ if (stmt->step)
+ {
+ value = exec_eval_expr(estate, stmt->step, &isnull, &valtype);
+ value = exec_cast_value(value, valtype, var->datatype->typoid,
+ &(var->datatype->typinput),
+ var->datatype->typioparam,
+ var->datatype->atttypmod, isnull);
+ if (isnull)
+ ereport(ERROR,
+ (errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
+ errmsg("BY value of FOR loop cannot be null")));
+ step_value = DatumGetInt32(value);
+ exec_eval_cleanup(estate);
+ if (step_value <= 0)
+ ereport(ERROR,
+ (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+ errmsg("BY value of FOR loop must be greater than zero")));
+ }
+ else
+ step_value = 1;
+
/*
* Now do the loop
*/
for (;;)
{
/*
- * Check bounds
+ * Check against upper bound
*/
if (stmt->reverse)
{
- if ((int4) (var->value) < (int4) value)
+ if (loop_value < end_value)
break;
}
else
{
- if ((int4) (var->value) > (int4) value)
+ if (loop_value > end_value)
break;
}
found = true; /* looped at least once */
+ /*
+ * Assign current value to loop var
+ */
+ var->value = Int32GetDatum(loop_value);
+ var->isnull = false;
+
/*
* Execute the statements
*/
rc = exec_stmts(estate, stmt->body);
- if (rc == PLPGSQL_RC_RETURN)
- break; /* return from function */
+ if (rc == PLPGSQL_RC_RETURN ||
+ rc == PLPGSQL_RC_RERAISE)
+ break; /* break out of the loop */
else if (rc == PLPGSQL_RC_EXIT)
{
if (estate->exitlabel == NULL)
* current statement's label, if any: return RC_EXIT so that the
* EXIT continues to propagate up the stack.
*/
-
break;
}
else if (rc == PLPGSQL_RC_CONTINUE)
{
if (estate->exitlabel == NULL)
- /* anonymous continue, so re-run the current loop */
+ /* unlabelled continue, so re-run the current loop */
rc = PLPGSQL_RC_OK;
else if (stmt->label != NULL &&
strcmp(stmt->label, estate->exitlabel) == 0)
}
/*
- * Increase/decrease loop var
+ * Increase/decrease loop value, unless it would overflow, in which
+ * case exit the loop.
*/
if (stmt->reverse)
- var->value--;
+ {
+ if ((int32) (loop_value - step_value) > loop_value)
+ break;
+ loop_value -= step_value;
+ }
else
- var->value++;
+ {
+ if ((int32) (loop_value + step_value) < loop_value)
+ break;
+ loop_value += step_value;
+ }
}
/*
static int
exec_stmt_fors(PLpgSQL_execstate *estate, PLpgSQL_stmt_fors *stmt)
{
- PLpgSQL_rec *rec = NULL;
- PLpgSQL_row *row = NULL;
- SPITupleTable *tuptab;
Portal portal;
- bool found = false;
- int rc = PLPGSQL_RC_OK;
- int i;
- int n;
+ int rc;
/*
- * Determine if we assign to a record or a row
+ * Open the implicit cursor for the statement using exec_run_select
*/
- if (stmt->rec != NULL)
- rec = (PLpgSQL_rec *) (estate->datums[stmt->rec->recno]);
- else if (stmt->row != NULL)
- row = (PLpgSQL_row *) (estate->datums[stmt->row->rowno]);
- else
- elog(ERROR, "unsupported target");
+ exec_run_select(estate, stmt->query, 0, &portal);
/*
- * Open the implicit cursor for the statement and fetch the initial 10
- * rows.
+ * Execute the loop
*/
- exec_run_select(estate, stmt->query, 0, &portal);
-
- SPI_cursor_fetch(portal, true, 10);
- tuptab = SPI_tuptable;
- n = SPI_processed;
+ rc = exec_for_query(estate, (PLpgSQL_stmt_forq *) stmt, portal, true);
/*
- * If the query didn't return any rows, set the target to NULL and return
- * with FOUND = false.
+ * Close the implicit cursor
*/
- if (n == 0)
- exec_move_row(estate, rec, row, NULL, tuptab->tupdesc);
- else
- found = true; /* processed at least one tuple */
+ SPI_cursor_close(portal);
- /*
- * Now do the loop
+ return rc;
+}
+
+
+/* ----------
+ * exec_stmt_forc Execute a loop for each row from a cursor.
+ * ----------
+ */
+static int
+exec_stmt_forc(PLpgSQL_execstate *estate, PLpgSQL_stmt_forc *stmt)
+{
+ PLpgSQL_var *curvar;
+ char *curname = NULL;
+ PLpgSQL_expr *query;
+ ParamListInfo paramLI;
+ Portal portal;
+ int rc;
+
+ /* ----------
+ * Get the cursor variable and if it has an assigned name, check
+ * that it's not in use currently.
+ * ----------
*/
- while (n > 0)
+ curvar = (PLpgSQL_var *) (estate->datums[stmt->curvar]);
+ if (!curvar->isnull)
{
- for (i = 0; i < n; i++)
- {
- /*
- * Assign the tuple to the target
- */
- exec_move_row(estate, rec, row, tuptab->vals[i], tuptab->tupdesc);
+ curname = TextDatumGetCString(curvar->value);
+ if (SPI_cursor_find(curname) != NULL)
+ ereport(ERROR,
+ (errcode(ERRCODE_DUPLICATE_CURSOR),
+ errmsg("cursor \"%s\" already in use", curname)));
+ }
- /*
- * Execute the statements
- */
- rc = exec_stmts(estate, stmt->body);
- if (rc != PLPGSQL_RC_OK)
- {
- if (rc == PLPGSQL_RC_EXIT)
- {
- if (estate->exitlabel == NULL)
- /* unlabelled exit, finish the current loop */
- rc = PLPGSQL_RC_OK;
- else if (stmt->label != NULL &&
- strcmp(stmt->label, estate->exitlabel) == 0)
- {
- /* labelled exit, matches the current stmt's label */
- estate->exitlabel = NULL;
- rc = PLPGSQL_RC_OK;
- }
-
- /*
- * otherwise, we processed a labelled exit that does not
- * match the current statement's label, if any: return
- * RC_EXIT so that the EXIT continues to recurse upward.
- */
- }
- else if (rc == PLPGSQL_RC_CONTINUE)
- {
- if (estate->exitlabel == NULL)
- {
- /* anonymous continue, so re-run the current loop */
- rc = PLPGSQL_RC_OK;
- continue;
- }
- else if (stmt->label != NULL &&
- strcmp(stmt->label, estate->exitlabel) == 0)
- {
- /* label matches named continue, so re-run loop */
- rc = PLPGSQL_RC_OK;
- estate->exitlabel = NULL;
- continue;
- }
-
- /*
- * otherwise, we processed a named continue that does not
- * match the current statement's label, if any: return
- * RC_CONTINUE so that the CONTINUE will propagate up the
- * stack.
- */
- }
-
- /*
- * We're aborting the loop, so cleanup and set FOUND. (This
- * code should match the code after the loop.)
- */
- SPI_freetuptable(tuptab);
- SPI_cursor_close(portal);
- exec_set_found(estate, found);
-
- return rc;
- }
- }
-
- SPI_freetuptable(tuptab);
-
- /*
- * Fetch the next 50 tuples
+ /* ----------
+ * Open the cursor just like an OPEN command
+ *
+ * Note: parser should already have checked that statement supplies
+ * args iff cursor needs them, but we check again to be safe.
+ * ----------
+ */
+ if (stmt->argquery != NULL)
+ {
+ /* ----------
+ * OPEN CURSOR with args. We fake a SELECT ... INTO ...
+ * statement to evaluate the args and put 'em into the
+ * internal row.
+ * ----------
*/
- SPI_cursor_fetch(portal, true, 50);
- n = SPI_processed;
- tuptab = SPI_tuptable;
+ PLpgSQL_stmt_execsql set_args;
+
+ if (curvar->cursor_explicit_argrow < 0)
+ ereport(ERROR,
+ (errcode(ERRCODE_SYNTAX_ERROR),
+ errmsg("arguments given for cursor without arguments")));
+
+ memset(&set_args, 0, sizeof(set_args));
+ set_args.cmd_type = PLPGSQL_STMT_EXECSQL;
+ set_args.lineno = stmt->lineno;
+ set_args.sqlstmt = stmt->argquery;
+ set_args.into = true;
+ /* XXX historically this has not been STRICT */
+ set_args.row = (PLpgSQL_row *)
+ (estate->datums[curvar->cursor_explicit_argrow]);
+
+ if (exec_stmt_execsql(estate, &set_args) != PLPGSQL_RC_OK)
+ elog(ERROR, "open cursor failed during argument processing");
+ }
+ else
+ {
+ if (curvar->cursor_explicit_argrow >= 0)
+ ereport(ERROR,
+ (errcode(ERRCODE_SYNTAX_ERROR),
+ errmsg("arguments required for cursor")));
}
- /*
- * Release last group of tuples
- */
- SPI_freetuptable(tuptab);
+ query = curvar->cursor_explicit_expr;
+ Assert(query);
+
+ if (query->plan == NULL)
+ exec_prepare_plan(estate, query, curvar->cursor_options);
/*
- * Close the implicit cursor
+ * Set up ParamListInfo (note this is only carrying a hook function,
+ * not any actual data values, at this point)
*/
- SPI_cursor_close(portal);
+ paramLI = setup_param_list(estate, query);
/*
- * Set the FOUND variable to indicate the result of executing the loop
- * (namely, whether we looped one or more times). This must be set here so
- * that it does not interfere with the value of the FOUND variable inside
- * the loop processing itself.
+ * Open the cursor (the paramlist will get copied into the portal)
*/
- exec_set_found(estate, found);
-
- return rc;
-}
-
+ portal = SPI_cursor_open_with_paramlist(curname, query->plan,
+ paramLI,
+ estate->readonly_func);
+ if (portal == NULL)
+ elog(ERROR, "could not open cursor: %s",
+ SPI_result_code_string(SPI_result));
-/* ----------
- * exec_stmt_select Run a query and assign the first
- * row to a record or rowtype.
- * ----------
- */
-static int
-exec_stmt_select(PLpgSQL_execstate *estate, PLpgSQL_stmt_select *stmt)
-{
- PLpgSQL_rec *rec = NULL;
- PLpgSQL_row *row = NULL;
- SPITupleTable *tuptab;
- uint32 n;
+ /* don't need paramlist any more */
+ if (paramLI)
+ pfree(paramLI);
/*
- * Initialize the global found variable to false
+ * If cursor variable was NULL, store the generated portal name in it
*/
- exec_set_found(estate, false);
+ if (curname == NULL)
+ assign_text_var(curvar, portal->name);
/*
- * Determine if we assign to a record or a row
+ * Execute the loop. We can't prefetch because the cursor is accessible
+ * to the user, for instance via UPDATE WHERE CURRENT OF within the loop.
*/
- if (stmt->rec != NULL)
- rec = (PLpgSQL_rec *) (estate->datums[stmt->rec->recno]);
- else if (stmt->row != NULL)
- row = (PLpgSQL_row *) (estate->datums[stmt->row->rowno]);
- else
- elog(ERROR, "unsupported target");
+ rc = exec_for_query(estate, (PLpgSQL_stmt_forq *) stmt, portal, false);
- /*
- * Run the query
+ /* ----------
+ * Close portal, and restore cursor variable if it was initially NULL.
+ * ----------
*/
- exec_run_select(estate, stmt->query, 1, NULL);
- tuptab = estate->eval_tuptable;
- n = estate->eval_processed;
+ SPI_cursor_close(portal);
- /*
- * If the query didn't return any rows, set the target to NULL and return.
- */
- if (n == 0)
+ if (curname == NULL)
{
- exec_move_row(estate, rec, row, NULL, tuptab->tupdesc);
- exec_eval_cleanup(estate);
- return PLPGSQL_RC_OK;
+ free_var(curvar);
+ curvar->value = (Datum) 0;
+ curvar->isnull = true;
}
- /*
- * Put the result into the target and set found to true
- */
- exec_move_row(estate, rec, row, tuptab->vals[0], tuptab->tupdesc);
- exec_set_found(estate, true);
-
- exec_eval_cleanup(estate);
+ if (curname)
+ pfree(curname);
- return PLPGSQL_RC_OK;
+ return rc;
}
if (HeapTupleIsValid(rec->tup))
{
- estate->retval = (Datum) rec->tup;
+ estate->retval = PointerGetDatum(rec->tup);
estate->rettupdesc = rec->tupdesc;
estate->retisnull = false;
}
PLpgSQL_row *row = (PLpgSQL_row *) retvar;
Assert(row->rowtupdesc);
- estate->retval = (Datum) make_tuple_from_row(estate, row,
- row->rowtupdesc);
- if (estate->retval == (Datum) NULL) /* should not happen */
+ estate->retval =
+ PointerGetDatum(make_tuple_from_row(estate, row,
+ row->rowtupdesc));
+ if (DatumGetPointer(estate->retval) == NULL) /* should not happen */
elog(ERROR, "row not compatible with its own tupdesc");
estate->rettupdesc = row->rowtupdesc;
estate->retisnull = false;
exec_run_select(estate, stmt->expr, 1, NULL);
if (estate->eval_processed > 0)
{
- estate->retval = (Datum) estate->eval_tuptable->vals[0];
+ estate->retval = PointerGetDatum(estate->eval_tuptable->vals[0]);
estate->rettupdesc = estate->eval_tuptable->tupdesc;
estate->retisnull = false;
}
{
TupleDesc tupdesc;
int natts;
- HeapTuple tuple;
+ MemoryContext oldcxt;
+ HeapTuple tuple = NULL;
bool free_tuple = false;
if (!estate->retisset)
tupdesc->attrs[0]->atttypmod,
isNull);
- tuple = heap_form_tuple(tupdesc, &retval, &isNull);
-
- free_tuple = true;
+ oldcxt = MemoryContextSwitchTo(estate->tuple_store_cxt);
+ tuplestore_putvalues(estate->tuple_store, tupdesc,
+ &retval, &isNull);
+ MemoryContextSwitchTo(oldcxt);
}
break;
case PLPGSQL_DTYPE_REC:
{
PLpgSQL_rec *rec = (PLpgSQL_rec *) retvar;
+ TupleConversionMap *tupmap;
if (!HeapTupleIsValid(rec->tup))
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("record \"%s\" is not assigned yet",
rec->refname),
- errdetail("The tuple structure of a not-yet-assigned record is indeterminate.")));
- if (!compatible_tupdesc(tupdesc, rec->tupdesc))
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("wrong record type supplied in RETURN NEXT")));
+ errdetail("The tuple structure of a not-yet-assigned"
+ " record is indeterminate.")));
+ tupmap = convert_tuples_by_position(rec->tupdesc,
+ tupdesc,
+ gettext_noop("wrong record type supplied in RETURN NEXT"));
tuple = rec->tup;
+ /* it might need conversion */
+ if (tupmap)
+ {
+ tuple = do_convert_tuple(tuple, tupmap);
+ free_conversion_map(tupmap);
+ }
}
break;
default:
elog(ERROR, "unrecognized dtype: %d", retvar->dtype);
- tuple = NULL; /* keep compiler quiet */
break;
}
}
tupdesc->attrs[0]->atttypmod,
isNull);
- tuple = heap_form_tuple(tupdesc, &retval, &isNull);
-
- free_tuple = true;
+ oldcxt = MemoryContextSwitchTo(estate->tuple_store_cxt);
+ tuplestore_putvalues(estate->tuple_store, tupdesc,
+ &retval, &isNull);
+ MemoryContextSwitchTo(oldcxt);
exec_eval_cleanup(estate);
}
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("RETURN NEXT must have a parameter")));
- tuple = NULL; /* keep compiler quiet */
}
if (HeapTupleIsValid(tuple))
{
- MemoryContext oldcxt;
-
oldcxt = MemoryContextSwitchTo(estate->tuple_store_cxt);
tuplestore_puttuple(estate->tuple_store, tuple);
MemoryContextSwitchTo(oldcxt);
return PLPGSQL_RC_OK;
}
+/* ----------
+ * exec_stmt_return_query Evaluate a query and add it to the
+ * list of tuples returned by the current
+ * SRF.
+ * ----------
+ */
+static int
+exec_stmt_return_query(PLpgSQL_execstate *estate,
+ PLpgSQL_stmt_return_query *stmt)
+{
+ Portal portal;
+ uint32 processed = 0;
+ TupleConversionMap *tupmap;
+
+ if (!estate->retisset)
+ ereport(ERROR,
+ (errcode(ERRCODE_SYNTAX_ERROR),
+ errmsg("cannot use RETURN QUERY in a non-SETOF function")));
+
+ if (estate->tuple_store == NULL)
+ exec_init_tuple_store(estate);
+
+ if (stmt->query != NULL)
+ {
+ /* static query */
+ exec_run_select(estate, stmt->query, 0, &portal);
+ }
+ else
+ {
+ /* RETURN QUERY EXECUTE */
+ Assert(stmt->dynquery != NULL);
+ portal = exec_dynquery_with_params(estate, stmt->dynquery,
+ stmt->params);
+ }
+
+ tupmap = convert_tuples_by_position(portal->tupDesc,
+ estate->rettupdesc,
+ gettext_noop("structure of query does not match function result type"));
+
+ while (true)
+ {
+ MemoryContext old_cxt;
+ int i;
+
+ SPI_cursor_fetch(portal, true, 50);
+ if (SPI_processed == 0)
+ break;
+
+ old_cxt = MemoryContextSwitchTo(estate->tuple_store_cxt);
+ for (i = 0; i < SPI_processed; i++)
+ {
+ HeapTuple tuple = SPI_tuptable->vals[i];
+
+ if (tupmap)
+ tuple = do_convert_tuple(tuple, tupmap);
+ tuplestore_puttuple(estate->tuple_store, tuple);
+ if (tupmap)
+ heap_freetuple(tuple);
+ processed++;
+ }
+ MemoryContextSwitchTo(old_cxt);
+
+ SPI_freetuptable(SPI_tuptable);
+ }
+
+ if (tupmap)
+ free_conversion_map(tupmap);
+
+ SPI_freetuptable(SPI_tuptable);
+ SPI_cursor_close(portal);
+
+ estate->eval_processed = processed;
+ exec_set_found(estate, processed != 0);
+
+ return PLPGSQL_RC_OK;
+}
+
static void
exec_init_tuple_store(PLpgSQL_execstate *estate)
{
estate->tuple_store_cxt = rsi->econtext->ecxt_per_query_memory;
oldcxt = MemoryContextSwitchTo(estate->tuple_store_cxt);
- estate->tuple_store = tuplestore_begin_heap(true, false, work_mem);
+ estate->tuple_store =
+ tuplestore_begin_heap(rsi->allowedModes & SFRM_Materialize_Random,
+ false, work_mem);
MemoryContextSwitchTo(oldcxt);
estate->rettupdesc = rsi->expectedDesc;
static int
exec_stmt_raise(PLpgSQL_execstate *estate, PLpgSQL_stmt_raise *stmt)
{
- char *cp;
- PLpgSQL_dstring ds;
- ListCell *current_param;
+ int err_code = 0;
+ char *condname = NULL;
+ char *err_message = NULL;
+ char *err_detail = NULL;
+ char *err_hint = NULL;
+ ListCell *lc;
- plpgsql_dstring_init(&ds);
- current_param = list_head(stmt->params);
+ /* RAISE with no parameters: re-throw current exception */
+ if (stmt->condname == NULL && stmt->message == NULL &&
+ stmt->options == NIL)
+ return PLPGSQL_RC_RERAISE;
- for (cp = stmt->message; *cp; cp++)
+ if (stmt->condname)
{
- /*
- * Occurrences of a single % are replaced by the next parameter's
- * external representation. Double %'s are converted to one %.
- */
- if (cp[0] == '%')
- {
- Oid paramtypeid;
- Datum paramvalue;
- bool paramisnull;
- char *extval;
+ err_code = plpgsql_recognize_err_condition(stmt->condname, true);
+ condname = pstrdup(stmt->condname);
+ }
+
+ if (stmt->message)
+ {
+ StringInfoData ds;
+ ListCell *current_param;
+ char *cp;
+
+ initStringInfo(&ds);
+ current_param = list_head(stmt->params);
- if (cp[1] == '%')
+ for (cp = stmt->message; *cp; cp++)
+ {
+ /*
+ * Occurrences of a single % are replaced by the next parameter's
+ * external representation. Double %'s are converted to one %.
+ */
+ if (cp[0] == '%')
{
- plpgsql_dstring_append_char(&ds, cp[1]);
- cp++;
- continue;
- }
+ Oid paramtypeid;
+ Datum paramvalue;
+ bool paramisnull;
+ char *extval;
- if (current_param == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_SYNTAX_ERROR),
- errmsg("too few parameters specified for RAISE")));
+ if (cp[1] == '%')
+ {
+ appendStringInfoChar(&ds, '%');
+ cp++;
+ continue;
+ }
+
+ if (current_param == NULL)
+ ereport(ERROR,
+ (errcode(ERRCODE_SYNTAX_ERROR),
+ errmsg("too few parameters specified for RAISE")));
- paramvalue = exec_eval_expr(estate,
+ paramvalue = exec_eval_expr(estate,
(PLpgSQL_expr *) lfirst(current_param),
- ¶misnull,
- ¶mtypeid);
+ ¶misnull,
+ ¶mtypeid);
- if (paramisnull)
- extval = "<NULL>";
+ if (paramisnull)
+ extval = "<NULL>";
+ else
+ extval = convert_value_to_string(paramvalue, paramtypeid);
+ appendStringInfoString(&ds, extval);
+ current_param = lnext(current_param);
+ exec_eval_cleanup(estate);
+ }
else
- extval = convert_value_to_string(paramvalue, paramtypeid);
- plpgsql_dstring_append(&ds, extval);
- current_param = lnext(current_param);
- exec_eval_cleanup(estate);
- continue;
+ appendStringInfoChar(&ds, cp[0]);
}
- plpgsql_dstring_append_char(&ds, cp[0]);
+ /*
+ * If more parameters were specified than were required to process the
+ * format string, throw an error
+ */
+ if (current_param != NULL)
+ ereport(ERROR,
+ (errcode(ERRCODE_SYNTAX_ERROR),
+ errmsg("too many parameters specified for RAISE")));
+
+ err_message = ds.data;
+ /* No pfree(ds.data), the pfree(err_message) does it */
}
- /*
- * If more parameters were specified than were required to process the
- * format string, throw an error
- */
- if (current_param != NULL)
- ereport(ERROR,
- (errcode(ERRCODE_SYNTAX_ERROR),
- errmsg("too many parameters specified for RAISE")));
+ foreach(lc, stmt->options)
+ {
+ PLpgSQL_raise_option *opt = (PLpgSQL_raise_option *) lfirst(lc);
+ Datum optionvalue;
+ bool optionisnull;
+ Oid optiontypeid;
+ char *extval;
+
+ optionvalue = exec_eval_expr(estate, opt->expr,
+ &optionisnull,
+ &optiontypeid);
+ if (optionisnull)
+ ereport(ERROR,
+ (errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
+ errmsg("RAISE statement option cannot be null")));
+
+ extval = convert_value_to_string(optionvalue, optiontypeid);
+
+ switch (opt->opt_type)
+ {
+ case PLPGSQL_RAISEOPTION_ERRCODE:
+ if (err_code)
+ ereport(ERROR,
+ (errcode(ERRCODE_SYNTAX_ERROR),
+ errmsg("RAISE option already specified: %s",
+ "ERRCODE")));
+ err_code = plpgsql_recognize_err_condition(extval, true);
+ condname = pstrdup(extval);
+ break;
+ case PLPGSQL_RAISEOPTION_MESSAGE:
+ if (err_message)
+ ereport(ERROR,
+ (errcode(ERRCODE_SYNTAX_ERROR),
+ errmsg("RAISE option already specified: %s",
+ "MESSAGE")));
+ err_message = pstrdup(extval);
+ break;
+ case PLPGSQL_RAISEOPTION_DETAIL:
+ if (err_detail)
+ ereport(ERROR,
+ (errcode(ERRCODE_SYNTAX_ERROR),
+ errmsg("RAISE option already specified: %s",
+ "DETAIL")));
+ err_detail = pstrdup(extval);
+ break;
+ case PLPGSQL_RAISEOPTION_HINT:
+ if (err_hint)
+ ereport(ERROR,
+ (errcode(ERRCODE_SYNTAX_ERROR),
+ errmsg("RAISE option already specified: %s",
+ "HINT")));
+ err_hint = pstrdup(extval);
+ break;
+ default:
+ elog(ERROR, "unrecognized raise option: %d", opt->opt_type);
+ }
+
+ exec_eval_cleanup(estate);
+ }
+
+ /* Default code if nothing specified */
+ if (err_code == 0 && stmt->elog_level >= ERROR)
+ err_code = ERRCODE_RAISE_EXCEPTION;
+
+ /* Default error message if nothing specified */
+ if (err_message == NULL)
+ {
+ if (condname)
+ {
+ err_message = condname;
+ condname = NULL;
+ }
+ else
+ err_message = pstrdup(unpack_sql_state(err_code));
+ }
/*
* Throw the error (may or may not come back)
estate->err_text = raise_skip_msg; /* suppress traceback of raise */
ereport(stmt->elog_level,
- ((stmt->elog_level >= ERROR) ? errcode(ERRCODE_RAISE_EXCEPTION) : 0,
- errmsg_internal("%s", plpgsql_dstring_get(&ds))));
+ (err_code ? errcode(err_code) : 0,
+ errmsg_internal("%s", err_message),
+ (err_detail != NULL) ? errdetail("%s", err_detail) : 0,
+ (err_hint != NULL) ? errhint("%s", err_hint) : 0));
estate->err_text = NULL; /* un-suppress... */
- plpgsql_dstring_free(&ds);
+ if (condname != NULL)
+ pfree(condname);
+ if (err_message != NULL)
+ pfree(err_message);
+ if (err_detail != NULL)
+ pfree(err_detail);
+ if (err_hint != NULL)
+ pfree(err_hint);
return PLPGSQL_RC_OK;
}
PLpgSQL_function *func,
ReturnSetInfo *rsi)
{
+ /* this link will be restored at exit from plpgsql_call_handler */
+ func->cur_estate = estate;
+
+ estate->func = func;
+
estate->retval = (Datum) 0;
estate->retisnull = true;
estate->rettype = InvalidOid;
estate->tuple_store_cxt = NULL;
estate->rsi = rsi;
- estate->trig_nargs = 0;
- estate->trig_argv = NULL;
-
estate->found_varno = func->found_varno;
estate->ndatums = func->ndatums;
estate->datums = palloc(sizeof(PLpgSQL_datum *) * estate->ndatums);
estate->eval_tuptable = NULL;
estate->eval_processed = 0;
estate->eval_lastoid = InvalidOid;
+ estate->eval_econtext = NULL;
+ estate->cur_expr = NULL;
- estate->err_func = func;
estate->err_stmt = NULL;
estate->err_text = NULL;
+ estate->plugin_info = NULL;
+
/*
- * Create an EState for evaluation of simple expressions, if there's not
- * one already in the current transaction. The EState is made a child of
- * TopTransactionContext so it will have the right lifespan.
+ * Create an EState and ExprContext for evaluation of simple expressions.
*/
- if (simple_eval_estate == NULL)
- {
- MemoryContext oldcontext;
-
- oldcontext = MemoryContextSwitchTo(TopTransactionContext);
- simple_eval_estate = CreateExecutorState();
- MemoryContextSwitchTo(oldcontext);
- }
+ plpgsql_create_econtext(estate);
/*
- * Create an expression context for simple expressions. This must be a
- * child of simple_eval_estate.
+ * Let the plugin see this function before we initialize any local
+ * PL/pgSQL variables - note that we also give the plugin a few function
+ * pointers so it can call back into PL/pgSQL for doing things like
+ * variable assignments and stack traces
*/
- estate->eval_econtext = CreateExprContext(simple_eval_estate);
+ if (*plugin_ptr)
+ {
+ (*plugin_ptr)->error_callback = plpgsql_exec_error_callback;
+ (*plugin_ptr)->assign_expr = exec_assign_expr;
+
+ if ((*plugin_ptr)->func_setup)
+ ((*plugin_ptr)->func_setup) (estate, func);
+ }
}
/* ----------
*/
static void
exec_prepare_plan(PLpgSQL_execstate *estate,
- PLpgSQL_expr *expr)
+ PLpgSQL_expr *expr, int cursorOptions)
{
- int i;
- _SPI_plan *spi_plan;
- void *plan;
- Oid *argtypes;
+ SPIPlanPtr plan;
/*
- * We need a temporary argtypes array to load with data. (The finished
- * plan structure will contain a copy of it.)
+ * The grammar can't conveniently set expr->func while building the
+ * parse tree, so make sure it's set before parser hooks need it.
*/
- argtypes = (Oid *) palloc(expr->nparams * sizeof(Oid));
-
- for (i = 0; i < expr->nparams; i++)
- {
- Datum paramval;
- bool paramisnull;
-
- exec_eval_datum(estate, estate->datums[expr->params[i]],
- InvalidOid,
- &argtypes[i], ¶mval, ¶misnull);
- }
+ expr->func = estate->func;
/*
* Generate and save the plan
*/
- plan = SPI_prepare(expr->query, expr->nparams, argtypes);
+ plan = SPI_prepare_params(expr->query,
+ (ParserSetupHook) plpgsql_parser_setup,
+ (void *) expr,
+ cursorOptions);
if (plan == NULL)
{
/* Some SPI errors deserve specific error messages */
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot COPY to/from client in PL/pgSQL")));
- case SPI_ERROR_CURSOR:
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("cannot manipulate cursors directly in PL/pgSQL"),
- errhint("Use PL/pgSQL's cursor features instead.")));
case SPI_ERROR_TRANSACTION:
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot begin/end transactions in PL/pgSQL"),
errhint("Use a BEGIN block with an EXCEPTION clause instead.")));
default:
- elog(ERROR, "SPI_prepare failed for \"%s\": %s",
+ elog(ERROR, "SPI_prepare_params failed for \"%s\": %s",
expr->query, SPI_result_code_string(SPI_result));
}
}
expr->plan = SPI_saveplan(plan);
- spi_plan = (_SPI_plan *) expr->plan;
- expr->plan_argtypes = spi_plan->argtypes;
- expr->expr_simple_expr = NULL;
- exec_simple_check_plan(expr);
-
SPI_freeplan(plan);
- pfree(argtypes);
+ exec_simple_check_plan(expr);
}
/* ----------
- * exec_stmt_execsql Execute an SQL statement not
- * returning any data.
+ * exec_stmt_execsql Execute an SQL statement (possibly with INTO).
* ----------
*/
static int
exec_stmt_execsql(PLpgSQL_execstate *estate,
PLpgSQL_stmt_execsql *stmt)
{
- int i;
- Datum *values;
- char *nulls;
+ ParamListInfo paramLI;
+ long tcount;
int rc;
PLpgSQL_expr *expr = stmt->sqlstmt;
/*
- * On the first call for this expression generate the plan
+ * On the first call for this statement generate the plan, and detect
+ * whether the statement is INSERT/UPDATE/DELETE
*/
if (expr->plan == NULL)
- exec_prepare_plan(estate, expr);
+ {
+ ListCell *l;
+
+ exec_prepare_plan(estate, expr, 0);
+ stmt->mod_stmt = false;
+ foreach(l, expr->plan->plancache_list)
+ {
+ CachedPlanSource *plansource = (CachedPlanSource *) lfirst(l);
+ ListCell *l2;
+
+ foreach(l2, plansource->plan->stmt_list)
+ {
+ PlannedStmt *p = (PlannedStmt *) lfirst(l2);
+
+ if (IsA(p, PlannedStmt) &&
+ p->canSetTag)
+ {
+ if (p->commandType == CMD_INSERT ||
+ p->commandType == CMD_UPDATE ||
+ p->commandType == CMD_DELETE)
+ stmt->mod_stmt = true;
+ }
+ }
+ }
+ }
/*
- * Now build up the values and nulls arguments for SPI_execute_plan()
+ * Set up ParamListInfo (note this is only carrying a hook function,
+ * not any actual data values, at this point)
*/
- values = (Datum *) palloc(expr->nparams * sizeof(Datum));
- nulls = (char *) palloc(expr->nparams * sizeof(char));
+ paramLI = setup_param_list(estate, expr);
- for (i = 0; i < expr->nparams; i++)
+ /*
+ * If we have INTO, then we only need one row back ... but if we have INTO
+ * STRICT, ask for two rows, so that we can verify the statement returns
+ * only one. INSERT/UPDATE/DELETE are always treated strictly. Without
+ * INTO, just run the statement to completion (tcount = 0).
+ *
+ * We could just ask for two rows always when using INTO, but there are
+ * some cases where demanding the extra row costs significant time, eg by
+ * forcing completion of a sequential scan. So don't do it unless we need
+ * to enforce strictness.
+ */
+ if (stmt->into)
{
- PLpgSQL_datum *datum = estate->datums[expr->params[i]];
- Oid paramtypeid;
- bool paramisnull;
-
- exec_eval_datum(estate, datum, expr->plan_argtypes[i],
- ¶mtypeid, &values[i], ¶misnull);
- if (paramisnull)
- nulls[i] = 'n';
+ if (stmt->strict || stmt->mod_stmt)
+ tcount = 2;
else
- nulls[i] = ' ';
+ tcount = 1;
}
+ else
+ tcount = 0;
/*
* Execute the plan
*/
- rc = SPI_execute_plan(expr->plan, values, nulls,
- estate->readonly_func, 0);
+ rc = SPI_execute_plan_with_paramlist(expr->plan, paramLI,
+ estate->readonly_func, tcount);
+
+ /*
+ * Check for error, and set FOUND if appropriate (for historical reasons
+ * we set FOUND only for certain query types). Also Assert that we
+ * identified the statement type the same as SPI did.
+ */
switch (rc)
{
- case SPI_OK_UTILITY:
- case SPI_OK_SELINTO:
+ case SPI_OK_SELECT:
+ Assert(!stmt->mod_stmt);
+ exec_set_found(estate, (SPI_processed != 0));
break;
case SPI_OK_INSERT:
- case SPI_OK_DELETE:
case SPI_OK_UPDATE:
+ case SPI_OK_DELETE:
+ case SPI_OK_INSERT_RETURNING:
+ case SPI_OK_UPDATE_RETURNING:
+ case SPI_OK_DELETE_RETURNING:
+ Assert(stmt->mod_stmt);
+ exec_set_found(estate, (SPI_processed != 0));
+ break;
+
+ case SPI_OK_SELINTO:
+ case SPI_OK_UTILITY:
+ Assert(!stmt->mod_stmt);
+ break;
+
+ case SPI_OK_REWRITTEN:
+ Assert(!stmt->mod_stmt);
/*
- * If the INSERT, DELETE, or UPDATE query affected at least one
- * tuple, set the magic 'FOUND' variable to true. This conforms
- * with the behavior of PL/SQL.
+ * The command was rewritten into another kind of command. It's
+ * not clear what FOUND would mean in that case (and SPI doesn't
+ * return the row count either), so just set it to false.
*/
- exec_set_found(estate, (SPI_processed != 0));
+ exec_set_found(estate, false);
break;
- case SPI_OK_SELECT:
- ereport(ERROR,
- (errcode(ERRCODE_SYNTAX_ERROR),
- errmsg("SELECT query has no destination for result data"),
- errhint("If you want to discard the results, use PERFORM instead.")));
-
default:
- elog(ERROR, "SPI_execute_plan failed executing query \"%s\": %s",
+ elog(ERROR, "SPI_execute_plan_with_paramlist failed executing query \"%s\": %s",
expr->query, SPI_result_code_string(rc));
}
- /*
- * Release any result tuples from SPI_execute_plan (probably shouldn't be
- * any)
- */
- SPI_freetuptable(SPI_tuptable);
-
- /* Save result info for GET DIAGNOSTICS */
+ /* All variants should save result info for GET DIAGNOSTICS */
estate->eval_processed = SPI_processed;
estate->eval_lastoid = SPI_lastoid;
- pfree(values);
- pfree(nulls);
+ /* Process INTO if present */
+ if (stmt->into)
+ {
+ SPITupleTable *tuptab = SPI_tuptable;
+ uint32 n = SPI_processed;
+ PLpgSQL_rec *rec = NULL;
+ PLpgSQL_row *row = NULL;
+
+ /* If the statement did not return a tuple table, complain */
+ if (tuptab == NULL)
+ ereport(ERROR,
+ (errcode(ERRCODE_SYNTAX_ERROR),
+ errmsg("INTO used with a command that cannot return data")));
+
+ /* Determine if we assign to a record or a row */
+ if (stmt->rec != NULL)
+ rec = (PLpgSQL_rec *) (estate->datums[stmt->rec->dno]);
+ else if (stmt->row != NULL)
+ row = (PLpgSQL_row *) (estate->datums[stmt->row->dno]);
+ else
+ elog(ERROR, "unsupported target");
+
+ /*
+ * If SELECT ... INTO specified STRICT, and the query didn't find
+ * exactly one row, throw an error. If STRICT was not specified, then
+ * allow the query to find any number of rows.
+ */
+ if (n == 0)
+ {
+ if (stmt->strict)
+ ereport(ERROR,
+ (errcode(ERRCODE_NO_DATA_FOUND),
+ errmsg("query returned no rows")));
+ /* set the target to NULL(s) */
+ exec_move_row(estate, rec, row, NULL, tuptab->tupdesc);
+ }
+ else
+ {
+ if (n > 1 && (stmt->strict || stmt->mod_stmt))
+ ereport(ERROR,
+ (errcode(ERRCODE_TOO_MANY_ROWS),
+ errmsg("query returned more than one row")));
+ /* Put the first result row into the target */
+ exec_move_row(estate, rec, row, tuptab->vals[0], tuptab->tupdesc);
+ }
+
+ /* Clean up */
+ SPI_freetuptable(SPI_tuptable);
+ }
+ else
+ {
+ /* If the statement returned a tuple table, complain */
+ if (SPI_tuptable != NULL)
+ ereport(ERROR,
+ (errcode(ERRCODE_SYNTAX_ERROR),
+ errmsg("query has no destination for result data"),
+ (rc == SPI_OK_SELECT) ? errhint("If you want to discard the results of a SELECT, use PERFORM instead.") : 0));
+ }
+
+ if (paramLI)
+ pfree(paramLI);
return PLPGSQL_RC_OK;
}
/* ----------
- * exec_stmt_dynexecute Execute a dynamic SQL query not
- * returning any data.
+ * exec_stmt_dynexecute Execute a dynamic SQL query
+ * (possibly with INTO).
* ----------
*/
static int
Oid restype;
char *querystr;
int exec_res;
- PLpgSQL_rec *rec = NULL;
- PLpgSQL_row *row = NULL;
-
- if (stmt->rec != NULL)
- rec = (PLpgSQL_rec *) (estate->datums[stmt->rec->recno]);
- else if (stmt->row != NULL)
- row = (PLpgSQL_row *) (estate->datums[stmt->row->rowno]);
/*
- * First we evaluate the string expression after the EXECUTE keyword. It's
+ * First we evaluate the string expression after the EXECUTE keyword. Its
* result is the querystring we have to execute.
*/
query = exec_eval_expr(estate, stmt->query, &isnull, &restype);
if (isnull)
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
- errmsg("cannot EXECUTE a null querystring")));
+ errmsg("query string argument of EXECUTE is null")));
/* Get the C-String representation */
querystr = convert_value_to_string(query, restype);
exec_eval_cleanup(estate);
/*
- * Call SPI_execute() without preparing a saved plan. The returncode can
- * be any standard OK. Note that while a SELECT is allowed, its results
- * will be discarded unless an INTO clause is specified.
+ * Execute the query without preparing a saved plan.
*/
- exec_res = SPI_execute(querystr, estate->readonly_func, 0);
-
- /* Assign to INTO variable */
- if (rec || row)
+ if (stmt->params)
{
- if (exec_res != SPI_OK_SELECT)
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("EXECUTE ... INTO is only for SELECT")));
- else
- {
- if (SPI_processed == 0)
- exec_move_row(estate, rec, row, NULL, SPI_tuptable->tupdesc);
- else
- exec_move_row(estate, rec, row,
- SPI_tuptable->vals[0], SPI_tuptable->tupdesc);
- }
+ PreparedParamsData *ppd;
+
+ ppd = exec_eval_using_params(estate, stmt->params);
+ exec_res = SPI_execute_with_args(querystr,
+ ppd->nargs, ppd->types,
+ ppd->values, ppd->nulls,
+ estate->readonly_func, 0);
+ free_params_data(ppd);
}
+ else
+ exec_res = SPI_execute(querystr, estate->readonly_func, 0);
switch (exec_res)
{
case SPI_OK_INSERT:
case SPI_OK_UPDATE:
case SPI_OK_DELETE:
+ case SPI_OK_INSERT_RETURNING:
+ case SPI_OK_UPDATE_RETURNING:
+ case SPI_OK_DELETE_RETURNING:
case SPI_OK_UTILITY:
+ case SPI_OK_REWRITTEN:
break;
case 0:
char *ptr;
for (ptr = querystr; *ptr; ptr++)
- if (!isspace((unsigned char) *ptr))
+ if (!scanner_isspace(*ptr))
break;
if (*ptr == 'S' || *ptr == 's')
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("EXECUTE of SELECT ... INTO is not implemented yet")));
+ errmsg("EXECUTE of SELECT ... INTO is not implemented")));
break;
}
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot COPY to/from client in PL/pgSQL")));
- case SPI_ERROR_CURSOR:
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("cannot manipulate cursors directly in PL/pgSQL"),
- errhint("Use PL/pgSQL's cursor features instead.")));
case SPI_ERROR_TRANSACTION:
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
break;
}
- /* Release any result from SPI_execute, as well as the querystring */
- SPI_freetuptable(SPI_tuptable);
- pfree(querystr);
-
/* Save result info for GET DIAGNOSTICS */
estate->eval_processed = SPI_processed;
estate->eval_lastoid = SPI_lastoid;
+ /* Process INTO if present */
+ if (stmt->into)
+ {
+ SPITupleTable *tuptab = SPI_tuptable;
+ uint32 n = SPI_processed;
+ PLpgSQL_rec *rec = NULL;
+ PLpgSQL_row *row = NULL;
+
+ /* If the statement did not return a tuple table, complain */
+ if (tuptab == NULL)
+ ereport(ERROR,
+ (errcode(ERRCODE_SYNTAX_ERROR),
+ errmsg("INTO used with a command that cannot return data")));
+
+ /* Determine if we assign to a record or a row */
+ if (stmt->rec != NULL)
+ rec = (PLpgSQL_rec *) (estate->datums[stmt->rec->dno]);
+ else if (stmt->row != NULL)
+ row = (PLpgSQL_row *) (estate->datums[stmt->row->dno]);
+ else
+ elog(ERROR, "unsupported target");
+
+ /*
+ * If SELECT ... INTO specified STRICT, and the query didn't find
+ * exactly one row, throw an error. If STRICT was not specified, then
+ * allow the query to find any number of rows.
+ */
+ if (n == 0)
+ {
+ if (stmt->strict)
+ ereport(ERROR,
+ (errcode(ERRCODE_NO_DATA_FOUND),
+ errmsg("query returned no rows")));
+ /* set the target to NULL(s) */
+ exec_move_row(estate, rec, row, NULL, tuptab->tupdesc);
+ }
+ else
+ {
+ if (n > 1 && stmt->strict)
+ ereport(ERROR,
+ (errcode(ERRCODE_TOO_MANY_ROWS),
+ errmsg("query returned more than one row")));
+ /* Put the first result row into the target */
+ exec_move_row(estate, rec, row, tuptab->vals[0], tuptab->tupdesc);
+ }
+ }
+ else
+ {
+ /*
+ * It might be a good idea to raise an error if the query returned
+ * tuples that are being ignored, but historically we have not done
+ * that.
+ */
+ }
+
+ /* Release any result from SPI_execute, as well as the querystring */
+ SPI_freetuptable(SPI_tuptable);
+ pfree(querystr);
+
return PLPGSQL_RC_OK;
}
static int
exec_stmt_dynfors(PLpgSQL_execstate *estate, PLpgSQL_stmt_dynfors *stmt)
{
- Datum query;
- bool isnull;
- Oid restype;
- char *querystr;
- PLpgSQL_rec *rec = NULL;
- PLpgSQL_row *row = NULL;
- SPITupleTable *tuptab;
- int n;
- void *plan;
Portal portal;
- bool found = false;
-
- /*
- * Determine if we assign to a record or a row
- */
- if (stmt->rec != NULL)
- rec = (PLpgSQL_rec *) (estate->datums[stmt->rec->recno]);
- else if (stmt->row != NULL)
- row = (PLpgSQL_row *) (estate->datums[stmt->row->rowno]);
- else
- elog(ERROR, "unsupported target");
-
- /*
- * Evaluate the string expression after the EXECUTE keyword. It's result
- * is the querystring we have to execute.
- */
- query = exec_eval_expr(estate, stmt->query, &isnull, &restype);
- if (isnull)
- ereport(ERROR,
- (errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
- errmsg("cannot EXECUTE a null querystring")));
-
- /* Get the C-String representation */
- querystr = convert_value_to_string(query, restype);
-
- exec_eval_cleanup(estate);
-
- /*
- * Prepare a plan and open an implicit cursor for the query
- */
- plan = SPI_prepare(querystr, 0, NULL);
- if (plan == NULL)
- elog(ERROR, "SPI_prepare failed for \"%s\": %s",
- querystr, SPI_result_code_string(SPI_result));
- portal = SPI_cursor_open(NULL, plan, NULL, NULL,
- estate->readonly_func);
- if (portal == NULL)
- elog(ERROR, "could not open implicit cursor for query \"%s\": %s",
- querystr, SPI_result_code_string(SPI_result));
- pfree(querystr);
- SPI_freeplan(plan);
-
- /*
- * Fetch the initial 10 tuples
- */
- SPI_cursor_fetch(portal, true, 10);
- tuptab = SPI_tuptable;
- n = SPI_processed;
+ int rc;
- /*
- * If the query didn't return any rows, set the target to NULL and return
- * with FOUND = false.
- */
- if (n == 0)
- exec_move_row(estate, rec, row, NULL, tuptab->tupdesc);
- else
- found = true; /* processed at least one tuple */
+ portal = exec_dynquery_with_params(estate, stmt->query, stmt->params);
/*
- * Now do the loop
+ * Execute the loop
*/
- while (n > 0)
- {
- int i;
-
- for (i = 0; i < n; i++)
- {
- int rc;
-
- /*
- * Assign the tuple to the target
- */
- exec_move_row(estate, rec, row, tuptab->vals[i], tuptab->tupdesc);
-
- /*
- * Execute the statements
- */
- rc = exec_stmts(estate, stmt->body);
-
- if (rc != PLPGSQL_RC_OK)
- {
- if (rc == PLPGSQL_RC_EXIT)
- {
- if (estate->exitlabel == NULL)
- /* unlabelled exit, finish the current loop */
- rc = PLPGSQL_RC_OK;
- else if (stmt->label != NULL &&
- strcmp(stmt->label, estate->exitlabel) == 0)
- {
- /* labelled exit, matches the current stmt's label */
- estate->exitlabel = NULL;
- rc = PLPGSQL_RC_OK;
- }
-
- /*
- * otherwise, we processed a labelled exit that does not
- * match the current statement's label, if any: return
- * RC_EXIT so that the EXIT continues to recurse upward.
- */
- }
- else if (rc == PLPGSQL_RC_CONTINUE)
- {
- if (estate->exitlabel == NULL)
- /* unlabelled continue, continue the current loop */
- continue;
- else if (stmt->label != NULL &&
- strcmp(stmt->label, estate->exitlabel) == 0)
- {
- /* labelled continue, matches the current stmt's label */
- estate->exitlabel = NULL;
- continue;
- }
-
- /*
- * otherwise, we process a labelled continue that does not
- * match the current statement's label, so propagate
- * RC_CONTINUE upward in the stack.
- */
- }
-
- /*
- * We're aborting the loop, so cleanup and set FOUND. (This
- * code should match the code after the loop.)
- */
- SPI_freetuptable(tuptab);
- SPI_cursor_close(portal);
- exec_set_found(estate, found);
-
- return rc;
- }
- }
-
- SPI_freetuptable(tuptab);
-
- /*
- * Fetch the next 50 tuples
- */
- SPI_cursor_fetch(portal, true, 50);
- n = SPI_processed;
- tuptab = SPI_tuptable;
- }
-
- /*
- * Release last group of tuples
- */
- SPI_freetuptable(tuptab);
+ rc = exec_for_query(estate, (PLpgSQL_stmt_forq *) stmt, portal, true);
/*
* Close the implicit cursor
*/
SPI_cursor_close(portal);
- /*
- * Set the FOUND variable to indicate the result of executing the loop
- * (namely, whether we looped one or more times). This must be set here so
- * that it does not interfere with the value of the FOUND variable inside
- * the loop processing itself.
- */
- exec_set_found(estate, found);
-
- return PLPGSQL_RC_OK;
+ return rc;
}
static int
exec_stmt_open(PLpgSQL_execstate *estate, PLpgSQL_stmt_open *stmt)
{
- PLpgSQL_var *curvar = NULL;
+ PLpgSQL_var *curvar;
char *curname = NULL;
- PLpgSQL_expr *query = NULL;
+ PLpgSQL_expr *query;
Portal portal;
- int i;
- Datum *values;
- char *nulls;
+ ParamListInfo paramLI;
bool isnull;
-
/* ----------
* Get the cursor variable and if it has an assigned name, check
* that it's not in use currently.
curvar = (PLpgSQL_var *) (estate->datums[stmt->curvar]);
if (!curvar->isnull)
{
- curname = DatumGetCString(DirectFunctionCall1(textout, curvar->value));
+ curname = TextDatumGetCString(curvar->value);
if (SPI_cursor_find(curname) != NULL)
ereport(ERROR,
(errcode(ERRCODE_DUPLICATE_CURSOR),
*/
query = stmt->query;
if (query->plan == NULL)
- exec_prepare_plan(estate, query);
+ exec_prepare_plan(estate, query, stmt->cursor_options);
}
else if (stmt->dynquery != NULL)
{
Datum queryD;
Oid restype;
char *querystr;
- void *curplan;
+ SPIPlanPtr curplan;
/* ----------
* We evaluate the string expression after the
if (isnull)
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
- errmsg("cannot EXECUTE a null querystring")));
+ errmsg("query string argument of EXECUTE is null")));
/* Get the C-String representation */
querystr = convert_value_to_string(queryD, restype);
* Now we prepare a query plan for it and open a cursor
* ----------
*/
- curplan = SPI_prepare(querystr, 0, NULL);
+ curplan = SPI_prepare_cursor(querystr, 0, NULL, stmt->cursor_options);
if (curplan == NULL)
- elog(ERROR, "SPI_prepare failed for \"%s\": %s",
+ elog(ERROR, "SPI_prepare_cursor failed for \"%s\": %s",
querystr, SPI_result_code_string(SPI_result));
portal = SPI_cursor_open(curname, curplan, NULL, NULL,
estate->readonly_func);
pfree(querystr);
SPI_freeplan(curplan);
- /* ----------
- * Store the eventually assigned cursor name in the cursor variable
- * ----------
+ /*
+ * If cursor variable was NULL, store the generated portal name in it
*/
- free_var(curvar);
- curvar->value = DirectFunctionCall1(textin, CStringGetDatum(portal->name));
- curvar->isnull = false;
- curvar->freeval = true;
+ if (curname == NULL)
+ assign_text_var(curvar, portal->name);
return PLPGSQL_RC_OK;
}
if (stmt->argquery != NULL)
{
/* ----------
- * Er - OPEN CURSOR (args). We fake a SELECT ... INTO ...
+ * OPEN CURSOR with args. We fake a SELECT ... INTO ...
* statement to evaluate the args and put 'em into the
* internal row.
* ----------
*/
- PLpgSQL_stmt_select set_args;
+ PLpgSQL_stmt_execsql set_args;
if (curvar->cursor_explicit_argrow < 0)
ereport(ERROR,
errmsg("arguments given for cursor without arguments")));
memset(&set_args, 0, sizeof(set_args));
- set_args.cmd_type = PLPGSQL_STMT_SELECT;
+ set_args.cmd_type = PLPGSQL_STMT_EXECSQL;
set_args.lineno = stmt->lineno;
+ set_args.sqlstmt = stmt->argquery;
+ set_args.into = true;
+ /* XXX historically this has not been STRICT */
set_args.row = (PLpgSQL_row *)
(estate->datums[curvar->cursor_explicit_argrow]);
- set_args.query = stmt->argquery;
- if (exec_stmt_select(estate, &set_args) != PLPGSQL_RC_OK)
+ if (exec_stmt_execsql(estate, &set_args) != PLPGSQL_RC_OK)
elog(ERROR, "open cursor failed during argument processing");
}
else
query = curvar->cursor_explicit_expr;
if (query->plan == NULL)
- exec_prepare_plan(estate, query);
+ exec_prepare_plan(estate, query, curvar->cursor_options);
}
- /* ----------
- * Here we go if we have a saved plan where we have to put
- * values into, either from an explicit cursor or from a
- * refcursor opened with OPEN ... FOR SELECT ...;
- * ----------
+ /*
+ * Set up ParamListInfo (note this is only carrying a hook function,
+ * not any actual data values, at this point)
*/
- values = (Datum *) palloc(query->nparams * sizeof(Datum));
- nulls = (char *) palloc(query->nparams * sizeof(char));
+ paramLI = setup_param_list(estate, query);
- for (i = 0; i < query->nparams; i++)
- {
- PLpgSQL_datum *datum = estate->datums[query->params[i]];
- Oid paramtypeid;
- bool paramisnull;
-
- exec_eval_datum(estate, datum, query->plan_argtypes[i],
- ¶mtypeid, &values[i], ¶misnull);
- if (paramisnull)
- nulls[i] = 'n';
- else
- nulls[i] = ' ';
- }
-
- /* ----------
+ /*
* Open the cursor
- * ----------
*/
- portal = SPI_cursor_open(curname, query->plan, values, nulls,
- estate->readonly_func);
+ portal = SPI_cursor_open_with_paramlist(curname, query->plan,
+ paramLI,
+ estate->readonly_func);
if (portal == NULL)
elog(ERROR, "could not open cursor: %s",
SPI_result_code_string(SPI_result));
- pfree(values);
- pfree(nulls);
+ /*
+ * If cursor variable was NULL, store the generated portal name in it
+ */
+ if (curname == NULL)
+ assign_text_var(curvar, portal->name);
+
if (curname)
pfree(curname);
-
- /* ----------
- * Store the eventually assigned portal name in the cursor variable
- * ----------
- */
- free_var(curvar);
- curvar->value = DirectFunctionCall1(textin, CStringGetDatum(portal->name));
- curvar->isnull = false;
- curvar->freeval = true;
+ if (paramLI)
+ pfree(paramLI);
return PLPGSQL_RC_OK;
}
/* ----------
- * exec_stmt_fetch Fetch from a cursor into a target
+ * exec_stmt_fetch Fetch from a cursor into a target, or just
+ * move the current position of the cursor
* ----------
*/
static int
PLpgSQL_var *curvar = NULL;
PLpgSQL_rec *rec = NULL;
PLpgSQL_row *row = NULL;
+ long how_many = stmt->how_many;
SPITupleTable *tuptab;
Portal portal;
char *curname;
- int n;
+ uint32 n;
/* ----------
* Get the portal of the cursor by name
if (curvar->isnull)
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
- errmsg("cursor variable \"%s\" is NULL", curvar->refname)));
- curname = DatumGetCString(DirectFunctionCall1(textout, curvar->value));
+ errmsg("cursor variable \"%s\" is null", curvar->refname)));
+ curname = TextDatumGetCString(curvar->value);
portal = SPI_cursor_find(curname);
if (portal == NULL)
errmsg("cursor \"%s\" does not exist", curname)));
pfree(curname);
- /* ----------
- * Determine if we fetch into a record or a row
- * ----------
- */
- if (stmt->rec != NULL)
- rec = (PLpgSQL_rec *) (estate->datums[stmt->rec->recno]);
- else if (stmt->row != NULL)
- row = (PLpgSQL_row *) (estate->datums[stmt->row->rowno]);
- else
- elog(ERROR, "unsupported target");
+ /* Calculate position for FETCH_RELATIVE or FETCH_ABSOLUTE */
+ if (stmt->expr)
+ {
+ bool isnull;
- /* ----------
- * Fetch 1 tuple from the cursor
- * ----------
- */
- SPI_cursor_fetch(portal, true, 1);
- tuptab = SPI_tuptable;
- n = SPI_processed;
+ /* XXX should be doing this in LONG not INT width */
+ how_many = exec_eval_integer(estate, stmt->expr, &isnull);
+
+ if (isnull)
+ ereport(ERROR,
+ (errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
+ errmsg("relative or absolute cursor position is null")));
+
+ exec_eval_cleanup(estate);
+ }
+
+ if (!stmt->is_move)
+ {
+ /* ----------
+ * Determine if we fetch into a record or a row
+ * ----------
+ */
+ if (stmt->rec != NULL)
+ rec = (PLpgSQL_rec *) (estate->datums[stmt->rec->dno]);
+ else if (stmt->row != NULL)
+ row = (PLpgSQL_row *) (estate->datums[stmt->row->dno]);
+ else
+ elog(ERROR, "unsupported target");
+
+ /* ----------
+ * Fetch 1 tuple from the cursor
+ * ----------
+ */
+ SPI_scroll_cursor_fetch(portal, stmt->direction, how_many);
+ tuptab = SPI_tuptable;
+ n = SPI_processed;
+
+ /* ----------
+ * Set the target appropriately.
+ * ----------
+ */
+ if (n == 0)
+ exec_move_row(estate, rec, row, NULL, tuptab->tupdesc);
+ else
+ exec_move_row(estate, rec, row, tuptab->vals[0], tuptab->tupdesc);
- /* ----------
- * Set the target and the global FOUND variable appropriately.
- * ----------
- */
- if (n == 0)
- {
- exec_move_row(estate, rec, row, NULL, tuptab->tupdesc);
- exec_set_found(estate, false);
+ SPI_freetuptable(tuptab);
}
else
{
- exec_move_row(estate, rec, row, tuptab->vals[0], tuptab->tupdesc);
- exec_set_found(estate, true);
+ /* Move the cursor */
+ SPI_scroll_cursor_move(portal, stmt->direction, how_many);
+ n = SPI_processed;
}
- SPI_freetuptable(tuptab);
+ /* Set the ROW_COUNT and the global FOUND variable appropriately. */
+ estate->eval_processed = n;
+ exec_set_found(estate, n != 0);
return PLPGSQL_RC_OK;
}
-
/* ----------
* exec_stmt_close Close a cursor
* ----------
if (curvar->isnull)
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
- errmsg("cursor variable \"%s\" is NULL", curvar->refname)));
- curname = DatumGetCString(DirectFunctionCall1(textout, curvar->value));
+ errmsg("cursor variable \"%s\" is null", curvar->refname)));
+ curname = TextDatumGetCString(curvar->value);
portal = SPI_cursor_find(curname);
if (portal == NULL)
if (*isNull && var->notnull)
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
- errmsg("NULL cannot be assigned to variable \"%s\" declared NOT NULL",
+ errmsg("null value cannot be assigned to variable \"%s\" declared NOT NULL",
var->refname)));
/*
PLpgSQL_row *row = (PLpgSQL_row *) target;
/* Source must be of RECORD or composite type */
- if (!(valtype == RECORDOID ||
- get_typtype(valtype) == 'c'))
+ if (!type_is_rowtype(valtype))
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("cannot assign non-composite value to a row variable")));
tmptup.t_tableOid = InvalidOid;
tmptup.t_data = td;
exec_move_row(estate, NULL, row, &tmptup, tupdesc);
+ ReleaseTupleDesc(tupdesc);
}
break;
}
PLpgSQL_rec *rec = (PLpgSQL_rec *) target;
/* Source must be of RECORD or composite type */
- if (!(valtype == RECORDOID ||
- get_typtype(valtype) == 'c'))
+ if (!type_is_rowtype(valtype))
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("cannot assign non-composite value to a record variable")));
tmptup.t_tableOid = InvalidOid;
tmptup.t_data = td;
exec_move_row(estate, rec, NULL, &tmptup, tupdesc);
+ ReleaseTupleDesc(tupdesc);
}
break;
}
int fno;
HeapTuple newtup;
int natts;
- int i;
Datum *values;
- char *nulls;
+ bool *nulls;
+ bool *replaces;
void *mustfree;
bool attisnull;
Oid atttype;
/*
* Get the number of the records field to change and the
- * number of attributes in the tuple.
+ * number of attributes in the tuple. Note: disallow system
+ * column names because the code below won't cope.
*/
fno = SPI_fnumber(rec->tupdesc, recfield->fieldname);
- if (fno == SPI_ERROR_NOATTRIBUTE)
+ if (fno <= 0)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_COLUMN),
errmsg("record \"%s\" has no field \"%s\"",
natts = rec->tupdesc->natts;
/*
- * Set up values/datums arrays for heap_formtuple. For all
+ * Set up values/control arrays for heap_modify_tuple. For all
* the attributes except the one we want to replace, use the
* value that's in the old tuple.
*/
values = palloc(sizeof(Datum) * natts);
- nulls = palloc(natts);
+ nulls = palloc(sizeof(bool) * natts);
+ replaces = palloc(sizeof(bool) * natts);
- for (i = 0; i < natts; i++)
- {
- if (i == fno)
- continue;
- values[i] = SPI_getbinval(rec->tup, rec->tupdesc,
- i + 1, &attisnull);
- if (attisnull)
- nulls[i] = 'n';
- else
- nulls[i] = ' ';
- }
+ memset(replaces, false, sizeof(bool) * natts);
+ replaces[fno] = true;
/*
* Now insert the new value, being careful to cast it to the
atttype,
atttypmod,
attisnull);
- if (attisnull)
- nulls[fno] = 'n';
- else
- nulls[fno] = ' ';
+ nulls[fno] = attisnull;
/*
* Avoid leaking the result of exec_simple_cast_value, if it
mustfree = NULL;
/*
- * Now call heap_formtuple() to create a new tuple that
+ * Now call heap_modify_tuple() to create a new tuple that
* replaces the old one in the record.
*/
- newtup = heap_formtuple(rec->tupdesc, values, nulls);
+ newtup = heap_modify_tuple(rec->tup, rec->tupdesc,
+ values, nulls, replaces);
if (rec->freetup)
heap_freetuple(rec->tup);
pfree(values);
pfree(nulls);
+ pfree(replaces);
if (mustfree)
pfree(mustfree);
if (nsubscripts >= MAXDIM)
ereport(ERROR,
(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions exceeds the maximum allowed, %d",
- MAXDIM)));
+ errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
+ nsubscripts, MAXDIM)));
subscripts[nsubscripts++] = arrayelem->subscript;
target = estate->datums[arrayelem->arrayparentno];
} while (target->dtype == PLPGSQL_DTYPE_ARRAYELEM);
/* Fetch current value of array datum */
- exec_eval_datum(estate, target, InvalidOid,
+ exec_eval_datum(estate, target,
&arraytypeid, &oldarraydatum, &oldarrayisnull);
arrayelemtypeid = get_element_type(arraytypeid);
if (subisnull)
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
- errmsg("array subscript in assignment must not be NULL")));
+ errmsg("array subscript in assignment must not be null")));
}
/* Coerce source value to match array element type. */
*
* The type oid, value in Datum format, and null flag are returned.
*
- * If expectedtypeid isn't InvalidOid, it is checked against the actual type.
- *
* At present this doesn't handle PLpgSQL_expr or PLpgSQL_arrayelem datums.
*
* NOTE: caller must not modify the returned value, since it points right
static void
exec_eval_datum(PLpgSQL_execstate *estate,
PLpgSQL_datum *datum,
- Oid expectedtypeid,
Oid *typeid,
Datum *value,
bool *isnull)
*typeid = var->datatype->typoid;
*value = var->value;
*isnull = var->isnull;
- if (expectedtypeid != InvalidOid && expectedtypeid != *typeid)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("type of \"%s\" does not match that when preparing the plan",
- var->refname)));
break;
}
*typeid = row->rowtupdesc->tdtypeid;
*value = HeapTupleGetDatum(tup);
*isnull = false;
- if (expectedtypeid != InvalidOid && expectedtypeid != *typeid)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("type of \"%s\" does not match that when preparing the plan",
- row->refname)));
break;
}
*typeid = rec->tupdesc->tdtypeid;
*value = HeapTupleGetDatum(&worktup);
*isnull = false;
- if (expectedtypeid != InvalidOid && expectedtypeid != *typeid)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("type of \"%s\" does not match that when preparing the plan",
- rec->refname)));
break;
}
rec->refname, recfield->fieldname)));
*typeid = SPI_gettypeid(rec->tupdesc, fno);
*value = SPI_getbinval(rec->tup, rec->tupdesc, fno, isnull);
- if (expectedtypeid != InvalidOid && expectedtypeid != *typeid)
+ break;
+ }
+
+ default:
+ elog(ERROR, "unrecognized dtype: %d", datum->dtype);
+ }
+}
+
+/*
+ * exec_get_datum_type Get datatype of a PLpgSQL_datum
+ *
+ * This is the same logic as in exec_eval_datum, except that it can handle
+ * some cases where exec_eval_datum has to fail; specifically, we may have
+ * a tupdesc but no row value for a record variable. (This currently can
+ * happen only for a trigger's NEW/OLD records.)
+ */
+static Oid
+exec_get_datum_type(PLpgSQL_execstate *estate,
+ PLpgSQL_datum *datum)
+{
+ Oid typeid;
+
+ switch (datum->dtype)
+ {
+ case PLPGSQL_DTYPE_VAR:
+ {
+ PLpgSQL_var *var = (PLpgSQL_var *) datum;
+
+ typeid = var->datatype->typoid;
+ break;
+ }
+
+ case PLPGSQL_DTYPE_ROW:
+ {
+ PLpgSQL_row *row = (PLpgSQL_row *) datum;
+
+ if (!row->rowtupdesc) /* should not happen */
+ elog(ERROR, "row variable has no tupdesc");
+ /* Make sure we have a valid type/typmod setting */
+ BlessTupleDesc(row->rowtupdesc);
+ typeid = row->rowtupdesc->tdtypeid;
+ break;
+ }
+
+ case PLPGSQL_DTYPE_REC:
+ {
+ PLpgSQL_rec *rec = (PLpgSQL_rec *) datum;
+
+ if (rec->tupdesc == NULL)
ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("type of \"%s.%s\" does not match that when preparing the plan",
- rec->refname, recfield->fieldname)));
+ (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
+ errmsg("record \"%s\" is not assigned yet",
+ rec->refname),
+ errdetail("The tuple structure of a not-yet-assigned record is indeterminate.")));
+ /* Make sure we have a valid type/typmod setting */
+ BlessTupleDesc(rec->tupdesc);
+ typeid = rec->tupdesc->tdtypeid;
break;
}
- case PLPGSQL_DTYPE_TRIGARG:
+ case PLPGSQL_DTYPE_RECFIELD:
{
- PLpgSQL_trigarg *trigarg = (PLpgSQL_trigarg *) datum;
- int tgargno;
+ PLpgSQL_recfield *recfield = (PLpgSQL_recfield *) datum;
+ PLpgSQL_rec *rec;
+ int fno;
- *typeid = TEXTOID;
- tgargno = exec_eval_integer(estate, trigarg->argnum, isnull);
- if (*isnull || tgargno < 0 || tgargno >= estate->trig_nargs)
- {
- *value = (Datum) 0;
- *isnull = true;
- }
- else
- {
- *value = estate->trig_argv[tgargno];
- *isnull = false;
- }
- if (expectedtypeid != InvalidOid && expectedtypeid != *typeid)
+ rec = (PLpgSQL_rec *) (estate->datums[recfield->recparentno]);
+ if (rec->tupdesc == NULL)
ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("type of tgargv[%d] does not match that when preparing the plan",
- tgargno)));
+ (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
+ errmsg("record \"%s\" is not assigned yet",
+ rec->refname),
+ errdetail("The tuple structure of a not-yet-assigned record is indeterminate.")));
+ fno = SPI_fnumber(rec->tupdesc, recfield->fieldname);
+ if (fno == SPI_ERROR_NOATTRIBUTE)
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_COLUMN),
+ errmsg("record \"%s\" has no field \"%s\"",
+ rec->refname, recfield->fieldname)));
+ typeid = SPI_gettypeid(rec->tupdesc, fno);
break;
}
default:
elog(ERROR, "unrecognized dtype: %d", datum->dtype);
+ typeid = InvalidOid; /* keep compiler quiet */
+ break;
}
+
+ return typeid;
}
/* ----------
bool *isNull,
Oid *rettype)
{
+ Datum result = 0;
int rc;
/*
- * If not already done create a plan for this expression
+ * If first time through, create a plan for this expression.
*/
if (expr->plan == NULL)
- exec_prepare_plan(estate, expr);
+ exec_prepare_plan(estate, expr, 0);
/*
* If this is a simple expression, bypass SPI and use the executor
* directly
*/
- if (expr->expr_simple_expr != NULL)
- return exec_eval_simple_expr(estate, expr, isNull, rettype);
+ if (exec_eval_simple_expr(estate, expr, &result, isNull, rettype))
+ return result;
+ /*
+ * Else do it the hard way via exec_run_select
+ */
rc = exec_run_select(estate, expr, 2, NULL);
if (rc != SPI_OK_SELECT)
ereport(ERROR,
if (estate->eval_tuptable->tupdesc->natts != 1)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
- errmsg("query \"%s\" returned %d columns", expr->query,
- estate->eval_tuptable->tupdesc->natts)));
+ errmsg_plural("query \"%s\" returned %d column",
+ "query \"%s\" returned %d columns",
+ estate->eval_tuptable->tupdesc->natts,
+ expr->query,
+ estate->eval_tuptable->tupdesc->natts)));
/*
* Return the result and its type
exec_run_select(PLpgSQL_execstate *estate,
PLpgSQL_expr *expr, long maxtuples, Portal *portalP)
{
- int i;
- Datum *values;
- char *nulls;
+ ParamListInfo paramLI;
int rc;
/*
* On the first call for this expression generate the plan
*/
if (expr->plan == NULL)
- exec_prepare_plan(estate, expr);
+ exec_prepare_plan(estate, expr, 0);
/*
- * Now build up the values and nulls arguments for SPI_execute_plan()
+ * Set up ParamListInfo (note this is only carrying a hook function,
+ * not any actual data values, at this point)
*/
- values = (Datum *) palloc(expr->nparams * sizeof(Datum));
- nulls = (char *) palloc(expr->nparams * sizeof(char));
-
- for (i = 0; i < expr->nparams; i++)
- {
- PLpgSQL_datum *datum = estate->datums[expr->params[i]];
- Oid paramtypeid;
- bool paramisnull;
-
- exec_eval_datum(estate, datum, expr->plan_argtypes[i],
- ¶mtypeid, &values[i], ¶misnull);
- if (paramisnull)
- nulls[i] = 'n';
- else
- nulls[i] = ' ';
- }
+ paramLI = setup_param_list(estate, expr);
/*
* If a portal was requested, put the query into the portal
*/
if (portalP != NULL)
{
- *portalP = SPI_cursor_open(NULL, expr->plan, values, nulls,
- estate->readonly_func);
+ *portalP = SPI_cursor_open_with_paramlist(NULL, expr->plan,
+ paramLI,
+ estate->readonly_func);
if (*portalP == NULL)
elog(ERROR, "could not open implicit cursor for query \"%s\": %s",
expr->query, SPI_result_code_string(SPI_result));
- pfree(values);
- pfree(nulls);
+ if (paramLI)
+ pfree(paramLI);
return SPI_OK_CURSOR;
}
/*
* Execute the query
*/
- rc = SPI_execute_plan(expr->plan, values, nulls,
- estate->readonly_func, maxtuples);
+ rc = SPI_execute_plan_with_paramlist(expr->plan, paramLI,
+ estate->readonly_func, maxtuples);
if (rc != SPI_OK_SELECT)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
estate->eval_processed = SPI_processed;
estate->eval_lastoid = SPI_lastoid;
- pfree(values);
- pfree(nulls);
+ if (paramLI)
+ pfree(paramLI);
+
+ return rc;
+}
+
+
+/*
+ * exec_for_query --- execute body of FOR loop for each row from a portal
+ *
+ * Used by exec_stmt_fors, exec_stmt_forc and exec_stmt_dynfors
+ */
+static int
+exec_for_query(PLpgSQL_execstate *estate, PLpgSQL_stmt_forq *stmt,
+ Portal portal, bool prefetch_ok)
+{
+ PLpgSQL_rec *rec = NULL;
+ PLpgSQL_row *row = NULL;
+ SPITupleTable *tuptab;
+ bool found = false;
+ int rc = PLPGSQL_RC_OK;
+ int n;
+
+ /*
+ * Determine if we assign to a record or a row
+ */
+ if (stmt->rec != NULL)
+ rec = (PLpgSQL_rec *) (estate->datums[stmt->rec->dno]);
+ else if (stmt->row != NULL)
+ row = (PLpgSQL_row *) (estate->datums[stmt->row->dno]);
+ else
+ elog(ERROR, "unsupported target");
+
+ /*
+ * Fetch the initial tuple(s). If prefetching is allowed then we grab a
+ * few more rows to avoid multiple trips through executor startup
+ * overhead.
+ */
+ SPI_cursor_fetch(portal, true, prefetch_ok ? 10 : 1);
+ tuptab = SPI_tuptable;
+ n = SPI_processed;
+
+ /*
+ * If the query didn't return any rows, set the target to NULL and fall
+ * through with found = false.
+ */
+ if (n <= 0)
+ exec_move_row(estate, rec, row, NULL, tuptab->tupdesc);
+ else
+ found = true; /* processed at least one tuple */
+
+ /*
+ * Now do the loop
+ */
+ while (n > 0)
+ {
+ int i;
+
+ for (i = 0; i < n; i++)
+ {
+ /*
+ * Assign the tuple to the target
+ */
+ exec_move_row(estate, rec, row, tuptab->vals[i], tuptab->tupdesc);
+
+ /*
+ * Execute the statements
+ */
+ rc = exec_stmts(estate, stmt->body);
+
+ if (rc != PLPGSQL_RC_OK)
+ {
+ if (rc == PLPGSQL_RC_EXIT)
+ {
+ if (estate->exitlabel == NULL)
+ {
+ /* unlabelled exit, so exit the current loop */
+ rc = PLPGSQL_RC_OK;
+ }
+ else if (stmt->label != NULL &&
+ strcmp(stmt->label, estate->exitlabel) == 0)
+ {
+ /* label matches this loop, so exit loop */
+ estate->exitlabel = NULL;
+ rc = PLPGSQL_RC_OK;
+ }
+
+ /*
+ * otherwise, we processed a labelled exit that does not
+ * match the current statement's label, if any; return
+ * RC_EXIT so that the EXIT continues to recurse upward.
+ */
+ }
+ else if (rc == PLPGSQL_RC_CONTINUE)
+ {
+ if (estate->exitlabel == NULL)
+ {
+ /* unlabelled continue, so re-run the current loop */
+ rc = PLPGSQL_RC_OK;
+ continue;
+ }
+ else if (stmt->label != NULL &&
+ strcmp(stmt->label, estate->exitlabel) == 0)
+ {
+ /* label matches this loop, so re-run loop */
+ estate->exitlabel = NULL;
+ rc = PLPGSQL_RC_OK;
+ continue;
+ }
+
+ /*
+ * otherwise, we process a labelled continue that does not
+ * match the current statement's label, if any; return
+ * RC_CONTINUE so that the CONTINUE will propagate up the
+ * stack.
+ */
+ }
+
+ /*
+ * We're aborting the loop. Need a goto to get out of two
+ * levels of loop...
+ */
+ goto loop_exit;
+ }
+ }
+
+ SPI_freetuptable(tuptab);
+
+ /*
+ * Fetch more tuples. If prefetching is allowed, grab 50 at a time.
+ */
+ SPI_cursor_fetch(portal, true, prefetch_ok ? 50 : 1);
+ tuptab = SPI_tuptable;
+ n = SPI_processed;
+ }
+
+loop_exit:
+
+ /*
+ * Release last group of tuples (if any)
+ */
+ SPI_freetuptable(tuptab);
+
+ /*
+ * Set the FOUND variable to indicate the result of executing the loop
+ * (namely, whether we looped one or more times). This must be set last so
+ * that it does not interfere with the value of the FOUND variable inside
+ * the loop processing itself.
+ */
+ exec_set_found(estate, found);
return rc;
}
* exec_eval_simple_expr - Evaluate a simple expression returning
* a Datum by directly calling ExecEvalExpr().
*
+ * If successful, store results into *result, *isNull, *rettype and return
+ * TRUE. If the expression is not simple (any more), return FALSE.
+ *
+ * It is possible though unlikely for a simple expression to become non-simple
+ * (consider for example redefining a trivial view). We must handle that for
+ * correctness; fortunately it's normally inexpensive to do
+ * RevalidateCachedPlan on a simple expression. We do not consider the other
+ * direction (non-simple expression becoming simple) because we'll still give
+ * correct results if that happens, and it's unlikely to be worth the cycles
+ * to check.
+ *
* Note: if pass-by-reference, the result is in the eval_econtext's
* temporary memory context. It will be freed when exec_eval_cleanup
* is done.
* ----------
*/
-static Datum
+static bool
exec_eval_simple_expr(PLpgSQL_execstate *estate,
PLpgSQL_expr *expr,
+ Datum *result,
bool *isNull,
Oid *rettype)
{
- Datum retval;
ExprContext *econtext = estate->eval_econtext;
- TransactionId curxid = GetTopTransactionId();
+ LocalTransactionId curlxid = MyProc->lxid;
+ CachedPlanSource *plansource;
+ CachedPlan *cplan;
ParamListInfo paramLI;
- int i;
- Snapshot saveActiveSnapshot;
+ PLpgSQL_expr *save_cur_expr;
+ MemoryContext oldcontext;
+
+ /*
+ * Forget it if expression wasn't simple before.
+ */
+ if (expr->expr_simple_expr == NULL)
+ return false;
+
+ /*
+ * Revalidate cached plan, so that we will notice if it became stale. (We
+ * also need to hold a refcount while using the plan.) Note that even if
+ * replanning occurs, the length of plancache_list can't change, since it
+ * is a property of the raw parsetree generated from the query text.
+ */
+ Assert(list_length(expr->plan->plancache_list) == 1);
+ plansource = (CachedPlanSource *) linitial(expr->plan->plancache_list);
+ cplan = RevalidateCachedPlan(plansource, true);
+ if (cplan->generation != expr->expr_simple_generation)
+ {
+ /* It got replanned ... is it still simple? */
+ exec_simple_check_plan(expr);
+ if (expr->expr_simple_expr == NULL)
+ {
+ /* Ooops, release refcount and fail */
+ ReleaseCachedPlan(cplan, true);
+ return false;
+ }
+ }
/*
* Pass back previously-determined result type.
/*
* Prepare the expression for execution, if it's not been done already in
- * the current transaction.
+ * the current transaction. (This will be forced to happen if we called
+ * exec_simple_check_plan above.)
*/
- if (expr->expr_simple_xid != curxid)
+ if (expr->expr_simple_lxid != curlxid)
{
expr->expr_simple_state = ExecPrepareExpr(expr->expr_simple_expr,
simple_eval_estate);
- expr->expr_simple_xid = curxid;
+ expr->expr_simple_lxid = curlxid;
+ }
+
+ /*
+ * We have to do some of the things SPI_execute_plan would do, in
+ * particular advance the snapshot if we are in a non-read-only function.
+ * Without this, stable functions within the expression would fail to see
+ * updates made so far by our own function.
+ */
+ SPI_push();
+
+ oldcontext = MemoryContextSwitchTo(econtext->ecxt_per_tuple_memory);
+ if (!estate->readonly_func)
+ {
+ CommandCounterIncrement();
+ PushActiveSnapshot(GetTransactionSnapshot());
}
/*
- * Param list can live in econtext's temporary memory context.
+ * Create the param list in econtext's temporary memory context.
+ * We won't need to free it explicitly, since it will go away at the
+ * next reset of that context.
+ *
+ * XXX think about avoiding repeated palloc's for param lists? It should
+ * be possible --- this routine isn't re-entrant anymore.
*
- * XXX think about avoiding repeated palloc's for param lists? Beware
- * however that this routine is re-entrant: exec_eval_datum() can call it
- * back for subscript evaluation, and so there can be a need to have more
- * than one active param list.
+ * Just for paranoia's sake, save and restore the prior value of
+ * estate->cur_expr, which setup_param_list() sets.
*/
- paramLI = (ParamListInfo)
- MemoryContextAlloc(econtext->ecxt_per_tuple_memory,
- (expr->nparams + 1) * sizeof(ParamListInfoData));
+ save_cur_expr = estate->cur_expr;
+
+ paramLI = setup_param_list(estate, expr);
+ econtext->ecxt_param_list_info = paramLI;
/*
- * Put the parameter values into the parameter list entries.
+ * Finally we can call the executor to evaluate the expression
*/
- for (i = 0; i < expr->nparams; i++)
- {
- PLpgSQL_datum *datum = estate->datums[expr->params[i]];
+ *result = ExecEvalExpr(expr->expr_simple_state,
+ econtext,
+ isNull,
+ NULL);
- paramLI[i].kind = PARAM_NUM;
- paramLI[i].id = i + 1;
- exec_eval_datum(estate, datum, expr->plan_argtypes[i],
- ¶mLI[i].ptype,
- ¶mLI[i].value, ¶mLI[i].isnull);
- }
- paramLI[i].kind = PARAM_INVALID;
+ /* Assorted cleanup */
+ estate->cur_expr = save_cur_expr;
+
+ if (!estate->readonly_func)
+ PopActiveSnapshot();
+
+ MemoryContextSwitchTo(oldcontext);
+
+ SPI_pop();
/*
- * Now we can safely make the econtext point to the param list.
+ * Now we can release our refcount on the cached plan.
*/
- econtext->ecxt_param_list_info = paramLI;
+ ReleaseCachedPlan(cplan, true);
/*
- * We have to do some of the things SPI_execute_plan would do, in
- * particular advance the snapshot if we are in a non-read-only function.
- * Without this, stable functions within the expression would fail to see
- * updates made so far by our own function.
+ * That's it.
*/
- SPI_push();
- saveActiveSnapshot = ActiveSnapshot;
+ return true;
+}
+
- PG_TRY();
+/*
+ * Create a ParamListInfo to pass to SPI
+ *
+ * The ParamListInfo array is initially all zeroes, in particular the
+ * ptype values are all InvalidOid. This causes the executor to call the
+ * paramFetch hook each time it wants a value. We thus evaluate only the
+ * parameters actually demanded.
+ *
+ * The result is a locally palloc'd array that should be pfree'd after use;
+ * but note it can be NULL.
+ */
+static ParamListInfo
+setup_param_list(PLpgSQL_execstate *estate, PLpgSQL_expr *expr)
+{
+ ParamListInfo paramLI;
+
+ /*
+ * Could we re-use these arrays instead of palloc'ing a new one each
+ * time? However, we'd have to zero the array each time anyway,
+ * since new values might have been assigned to the variables.
+ */
+ if (estate->ndatums > 0)
{
- MemoryContext oldcontext;
+ /* sizeof(ParamListInfoData) includes the first array element */
+ paramLI = (ParamListInfo)
+ palloc0(sizeof(ParamListInfoData) +
+ (estate->ndatums - 1) * sizeof(ParamExternData));
+ paramLI->paramFetch = plpgsql_param_fetch;
+ paramLI->paramFetchArg = (void *) estate;
+ paramLI->parserSetup = (ParserSetupHook) plpgsql_parser_setup;
+ paramLI->parserSetupArg = (void *) expr;
+ paramLI->numParams = estate->ndatums;
- oldcontext = MemoryContextSwitchTo(econtext->ecxt_per_tuple_memory);
- if (!estate->readonly_func)
- {
- CommandCounterIncrement();
- ActiveSnapshot = CopySnapshot(GetTransactionSnapshot());
- }
+ /*
+ * Set up link to active expr where the hook functions can find it.
+ * Callers must save and restore cur_expr if there is any chance
+ * that they are interrupting an active use of parameters.
+ */
+ estate->cur_expr = expr;
/*
- * Finally we can call the executor to evaluate the expression
+ * Also make sure this is set before parser hooks need it. There
+ * is no need to save and restore, since the value is always correct
+ * once set.
*/
- retval = ExecEvalExpr(expr->expr_simple_state,
- econtext,
- isNull,
- NULL);
- MemoryContextSwitchTo(oldcontext);
- }
- PG_CATCH();
- {
- /* Restore global vars and propagate error */
- ActiveSnapshot = saveActiveSnapshot;
- PG_RE_THROW();
+ expr->func = estate->func;
}
- PG_END_TRY();
+ else
+ paramLI = NULL;
+ return paramLI;
+}
- ActiveSnapshot = saveActiveSnapshot;
- SPI_pop();
+/*
+ * plpgsql_parser_setup set up parser hooks for dynamic parameters
+ */
+static void
+plpgsql_parser_setup(ParseState *pstate, PLpgSQL_expr *expr)
+{
+ pstate->p_ref_hook_state = (void *) expr;
+ pstate->p_paramref_hook = plpgsql_param_ref;
+ /* no need to use p_coerce_param_hook */
+}
+
+/*
+ * plpgsql_param_ref parser callback for ParamRefs ($n symbols)
+ */
+static Node *
+plpgsql_param_ref(ParseState *pstate, ParamRef *pref)
+{
+ int paramno = pref->number;
+ PLpgSQL_expr *expr = (PLpgSQL_expr *) pstate->p_ref_hook_state;
+ PLpgSQL_execstate *estate;
+ Param *param;
+
+ /* Let's just check parameter number is in range */
+ if (!bms_is_member(paramno-1, expr->paramnos))
+ return NULL;
/*
- * That's it.
+ * We use the function's current estate to resolve parameter data types.
+ * This is really pretty bogus because there is no provision for updating
+ * plans when those types change ...
*/
- return retval;
+ estate = expr->func->cur_estate;
+ Assert(paramno <= estate->ndatums);
+
+ param = makeNode(Param);
+ param->paramkind = PARAM_EXTERN;
+ param->paramid = paramno;
+ param->paramtype = exec_get_datum_type(estate,
+ estate->datums[paramno-1]);
+ param->paramtypmod = -1;
+ param->location = pref->location;
+
+ return (Node *) param;
+}
+
+/*
+ * plpgsql_param_fetch paramFetch callback for dynamic parameter fetch
+ */
+static void
+plpgsql_param_fetch(ParamListInfo params, int paramid)
+{
+ int dno;
+ PLpgSQL_execstate *estate;
+ PLpgSQL_expr *expr;
+ PLpgSQL_datum *datum;
+ ParamExternData *prm;
+
+ /* paramid's are 1-based, but dnos are 0-based */
+ dno = paramid - 1;
+ Assert(dno >= 0 && dno < params->numParams);
+
+ /* fetch back the hook data */
+ estate = (PLpgSQL_execstate *) params->paramFetchArg;
+ expr = estate->cur_expr;
+ Assert(params->numParams == estate->ndatums);
+
+ /*
+ * Do nothing if asked for a value that's not supposed to be used by
+ * this SQL expression. This avoids unwanted evaluations when functions
+ * such as copyParamList try to materialize all the values.
+ */
+ if (!bms_is_member(dno, expr->paramnos))
+ return;
+
+ /* OK, evaluate the value and store into the appropriate paramlist slot */
+ datum = estate->datums[dno];
+ prm = ¶ms->params[dno];
+ exec_eval_datum(estate, datum,
+ &prm->ptype, &prm->value, &prm->isnull);
}
if (rec != NULL)
{
/*
- * copy input first, just in case it is pointing at variable's value
+ * Copy input first, just in case it is pointing at variable's value
*/
if (HeapTupleIsValid(tup))
tup = heap_copytuple(tup);
+ else if (tupdesc)
+ {
+ /* If we have a tupdesc but no data, form an all-nulls tuple */
+ bool *nulls;
+
+ nulls = (bool *) palloc(tupdesc->natts * sizeof(bool));
+ memset(nulls, true, tupdesc->natts * sizeof(bool));
+
+ tup = heap_form_tuple(tupdesc, NULL, nulls);
+
+ pfree(nulls);
+ }
+
if (tupdesc)
tupdesc = CreateTupleDescCopy(tupdesc);
+ /* Free the old value ... */
if (rec->freetup)
{
heap_freetuple(rec->tup);
rec->freetupdesc = false;
}
+ /* ... and install the new */
if (HeapTupleIsValid(tup))
{
rec->tup = tup;
rec->freetup = true;
}
- else if (tupdesc)
- {
- /* If we have a tupdesc but no data, form an all-nulls tuple */
- char *nulls;
-
- nulls = (char *) palloc(tupdesc->natts * sizeof(char));
- memset(nulls, 'n', tupdesc->natts * sizeof(char));
-
- rec->tup = heap_formtuple(tupdesc, NULL, nulls);
- rec->freetup = true;
-
- pfree(nulls);
- }
else
rec->tup = NULL;
* Row is a bit more complicated in that we assign the individual
* attributes of the tuple to the variables the row points to.
*
- * NOTE: this code used to demand row->nfields == tup->t_data->t_natts,
- * but that's wrong. The tuple might have more fields than we expected if
- * it's from an inheritance-child table of the current table, or it might
- * have fewer if the table has had columns added by ALTER TABLE. Ignore
- * extra columns and assume NULL for missing columns, the same as
- * heap_getattr would do. We also have to skip over dropped columns in
- * either the source or destination.
+ * NOTE: this code used to demand row->nfields ==
+ * HeapTupleHeaderGetNatts(tup->t_data), but that's wrong. The tuple
+ * might have more fields than we expected if it's from an
+ * inheritance-child table of the current table, or it might have fewer if
+ * the table has had columns added by ALTER TABLE. Ignore extra columns
+ * and assume NULL for missing columns, the same as heap_getattr would do.
+ * We also have to skip over dropped columns in either the source or
+ * destination.
*
* If we have no tuple data at all, we'll assign NULL to all columns of
* the row variable.
*/
if (row != NULL)
{
+ int td_natts = tupdesc ? tupdesc->natts : 0;
int t_natts;
int fnum;
int anum;
if (HeapTupleIsValid(tup))
- t_natts = tup->t_data->t_natts;
+ t_natts = HeapTupleHeaderGetNatts(tup->t_data);
else
t_natts = 0;
var = (PLpgSQL_var *) (estate->datums[row->varnos[fnum]]);
- while (anum < t_natts && tupdesc->attrs[anum]->attisdropped)
+ while (anum < td_natts && tupdesc->attrs[anum]->attisdropped)
anum++; /* skip dropped column in tuple */
- if (anum < t_natts)
+ if (anum < td_natts)
{
- value = SPI_getbinval(tup, tupdesc, anum + 1, &isnull);
+ if (anum < t_natts)
+ value = SPI_getbinval(tup, tupdesc, anum + 1, &isnull);
+ else
+ {
+ value = (Datum) 0;
+ isnull = true;
+ }
valtype = SPI_gettypeid(tupdesc, anum + 1);
anum++;
}
elog(ERROR, "dropped rowtype entry for non-dropped column");
exec_eval_datum(estate, estate->datums[row->varnos[i]],
- InvalidOid, &fieldtypeid, &dvalues[i], &nulls[i]);
+ &fieldtypeid, &dvalues[i], &nulls[i]);
if (fieldtypeid != tupdesc->attrs[i]->atttypid)
return NULL;
}
bool typIsVarlena;
getTypeOutputInfo(valtype, &typoutput, &typIsVarlena);
-
return OidOutputFunctionCall(typoutput, value);
}
Oid reqtype, int32 reqtypmod,
bool isnull)
{
- if (!isnull)
+ if (valtype != reqtype || reqtypmod != -1)
{
- if (valtype != reqtype || reqtypmod != -1)
- {
- Oid typinput;
- Oid typioparam;
- FmgrInfo finfo_input;
+ Oid typinput;
+ Oid typioparam;
+ FmgrInfo finfo_input;
- getTypeInputInfo(reqtype, &typinput, &typioparam);
+ getTypeInputInfo(reqtype, &typinput, &typioparam);
- fmgr_info(typinput, &finfo_input);
+ fmgr_info(typinput, &finfo_input);
- value = exec_cast_value(value,
- valtype,
- reqtype,
- &finfo_input,
- typioparam,
- reqtypmod,
- isnull);
- }
+ value = exec_cast_value(value,
+ valtype,
+ reqtype,
+ &finfo_input,
+ typioparam,
+ reqtypmod,
+ isnull);
}
return value;
case T_RelabelType:
return exec_simple_check_node((Node *) ((RelabelType *) node)->arg);
+ case T_CoerceViaIO:
+ return exec_simple_check_node((Node *) ((CoerceViaIO *) node)->arg);
+
+ case T_ArrayCoerceExpr:
+ return exec_simple_check_node((Node *) ((ArrayCoerceExpr *) node)->arg);
+
case T_ConvertRowtypeExpr:
return exec_simple_check_node((Node *) ((ConvertRowtypeExpr *) node)->arg);
case T_RowCompareExpr:
{
- RowCompareExpr *expr = (RowCompareExpr *) node;
+ RowCompareExpr *expr = (RowCompareExpr *) node;
if (!exec_simple_check_node((Node *) expr->largs))
return FALSE;
return TRUE;
}
+ case T_XmlExpr:
+ {
+ XmlExpr *expr = (XmlExpr *) node;
+
+ if (!exec_simple_check_node((Node *) expr->named_args))
+ return FALSE;
+ if (!exec_simple_check_node((Node *) expr->args))
+ return FALSE;
+
+ return TRUE;
+ }
+
case T_NullIfExpr:
{
NullIfExpr *expr = (NullIfExpr *) node;
static void
exec_simple_check_plan(PLpgSQL_expr *expr)
{
- _SPI_plan *spi_plan = (_SPI_plan *) expr->plan;
+ CachedPlanSource *plansource;
+ PlannedStmt *stmt;
Plan *plan;
TargetEntry *tle;
+ /*
+ * Initialize to "not simple", and remember the plan generation number we
+ * last checked. (If the query produces more or less than one parsetree
+ * we just leave expr_simple_generation set to 0.)
+ */
expr->expr_simple_expr = NULL;
+ expr->expr_simple_generation = 0;
/*
* 1. We can only evaluate queries that resulted in one single execution
* plan
*/
- if (list_length(spi_plan->ptlist) != 1)
+ if (list_length(expr->plan->plancache_list) != 1)
+ return;
+ plansource = (CachedPlanSource *) linitial(expr->plan->plancache_list);
+ expr->expr_simple_generation = plansource->generation;
+ if (list_length(plansource->plan->stmt_list) != 1)
return;
- plan = (Plan *) linitial(spi_plan->ptlist);
+ stmt = (PlannedStmt *) linitial(plansource->plan->stmt_list);
/*
* 2. It must be a RESULT plan --> no scan's required
*/
- if (plan == NULL) /* utility statement produces this */
+ if (!IsA(stmt, PlannedStmt))
return;
-
+ plan = stmt->planTree;
if (!IsA(plan, Result))
return;
*/
expr->expr_simple_expr = tle->expr;
expr->expr_simple_state = NULL;
- expr->expr_simple_xid = InvalidTransactionId;
+ expr->expr_simple_lxid = InvalidLocalTransactionId;
/* Also stash away the expression result type */
expr->expr_simple_type = exprType((Node *) tle->expr);
}
-/*
- * Check two tupledescs have matching number and types of attributes
+/* ----------
+ * exec_set_found Set the global found variable
+ * to true/false
+ * ----------
*/
-static bool
-compatible_tupdesc(TupleDesc td1, TupleDesc td2)
+static void
+exec_set_found(PLpgSQL_execstate *estate, bool state)
{
- int i;
+ PLpgSQL_var *var;
- if (td1->natts != td2->natts)
- return false;
+ var = (PLpgSQL_var *) (estate->datums[estate->found_varno]);
+ var->value = PointerGetDatum(state);
+ var->isnull = false;
+}
+
+/*
+ * plpgsql_create_econtext --- create an eval_econtext for the current function
+ *
+ * We may need to create a new simple_eval_estate too, if there's not one
+ * already for the current transaction. The EState will be cleaned up at
+ * transaction end.
+ */
+static void
+plpgsql_create_econtext(PLpgSQL_execstate *estate)
+{
+ SimpleEcontextStackEntry *entry;
- for (i = 0; i < td1->natts; i++)
+ /*
+ * Create an EState for evaluation of simple expressions, if there's not
+ * one already in the current transaction. The EState is made a child of
+ * TopTransactionContext so it will have the right lifespan.
+ */
+ if (simple_eval_estate == NULL)
{
- if (td1->attrs[i]->atttypid != td2->attrs[i]->atttypid)
- return false;
+ MemoryContext oldcontext;
+
+ oldcontext = MemoryContextSwitchTo(TopTransactionContext);
+ simple_eval_estate = CreateExecutorState();
+ MemoryContextSwitchTo(oldcontext);
}
- return true;
+ /*
+ * Create a child econtext for the current function.
+ */
+ estate->eval_econtext = CreateExprContext(simple_eval_estate);
+
+ /*
+ * Make a stack entry so we can clean up the econtext at subxact end.
+ * Stack entries are kept in TopTransactionContext for simplicity.
+ */
+ entry = (SimpleEcontextStackEntry *)
+ MemoryContextAlloc(TopTransactionContext,
+ sizeof(SimpleEcontextStackEntry));
+
+ entry->stack_econtext = estate->eval_econtext;
+ entry->xact_subxid = GetCurrentSubTransactionId();
+
+ entry->next = simple_econtext_stack;
+ simple_econtext_stack = entry;
}
-/* ----------
- * exec_set_found Set the global found variable
- * to true/false
- * ----------
+/*
+ * plpgsql_destroy_econtext --- destroy function's econtext
+ *
+ * We check that it matches the top stack entry, and destroy the stack
+ * entry along with the context.
*/
static void
-exec_set_found(PLpgSQL_execstate *estate, bool state)
+plpgsql_destroy_econtext(PLpgSQL_execstate *estate)
{
- PLpgSQL_var *var;
+ SimpleEcontextStackEntry *next;
- var = (PLpgSQL_var *) (estate->datums[estate->found_varno]);
- var->value = (Datum) state;
- var->isnull = false;
+ Assert(simple_econtext_stack != NULL);
+ Assert(simple_econtext_stack->stack_econtext == estate->eval_econtext);
+
+ next = simple_econtext_stack->next;
+ pfree(simple_econtext_stack);
+ simple_econtext_stack = next;
+
+ FreeExprContext(estate->eval_econtext, true);
+ estate->eval_econtext = NULL;
}
/*
* plpgsql_xact_cb --- post-transaction-commit-or-abort cleanup
*
- * If a simple_eval_estate was created in the current transaction,
+ * If a simple-expression EState was created in the current transaction,
* it has to be cleaned up.
- *
- * XXX Do we need to do anything at subtransaction events?
- * Maybe subtransactions need to have their own simple_eval_estate?
- * It would get a lot messier, so for now let's assume we don't need that.
*/
void
plpgsql_xact_cb(XactEvent event, void *arg)
* expect the regular abort recovery procedures to release everything of
* interest.
*/
- if (event == XACT_EVENT_COMMIT && simple_eval_estate)
- FreeExecutorState(simple_eval_estate);
- simple_eval_estate = NULL;
+ if (event != XACT_EVENT_ABORT)
+ {
+ /* Shouldn't be any econtext stack entries left at commit */
+ Assert(simple_econtext_stack == NULL);
+
+ if (simple_eval_estate)
+ FreeExecutorState(simple_eval_estate);
+ simple_eval_estate = NULL;
+ }
+ else
+ {
+ simple_econtext_stack = NULL;
+ simple_eval_estate = NULL;
+ }
+}
+
+/*
+ * plpgsql_subxact_cb --- post-subtransaction-commit-or-abort cleanup
+ *
+ * Make sure any simple-expression econtexts created in the current
+ * subtransaction get cleaned up. We have to do this explicitly because
+ * no other code knows which child econtexts of simple_eval_estate belong
+ * to which level of subxact.
+ */
+void
+plpgsql_subxact_cb(SubXactEvent event, SubTransactionId mySubid,
+ SubTransactionId parentSubid, void *arg)
+{
+ if (event == SUBXACT_EVENT_START_SUB)
+ return;
+
+ while (simple_econtext_stack != NULL &&
+ simple_econtext_stack->xact_subxid == mySubid)
+ {
+ SimpleEcontextStackEntry *next;
+
+ FreeExprContext(simple_econtext_stack->stack_econtext,
+ (event == SUBXACT_EVENT_COMMIT_SUB));
+ next = simple_econtext_stack->next;
+ pfree(simple_econtext_stack);
+ simple_econtext_stack = next;
+ }
}
+/*
+ * free_var --- pfree any pass-by-reference value of the variable.
+ *
+ * This should always be followed by some assignment to var->value,
+ * as it leaves a dangling pointer.
+ */
static void
free_var(PLpgSQL_var *var)
{
var->freeval = false;
}
}
+
+/*
+ * free old value of a text variable and assign new value from C string
+ */
+static void
+assign_text_var(PLpgSQL_var *var, const char *str)
+{
+ free_var(var);
+ var->value = CStringGetTextDatum(str);
+ var->isnull = false;
+ var->freeval = true;
+}
+
+/*
+ * exec_eval_using_params --- evaluate params of USING clause
+ */
+static PreparedParamsData *
+exec_eval_using_params(PLpgSQL_execstate *estate, List *params)
+{
+ PreparedParamsData *ppd;
+ int nargs;
+ int i;
+ ListCell *lc;
+
+ ppd = (PreparedParamsData *) palloc(sizeof(PreparedParamsData));
+ nargs = list_length(params);
+
+ ppd->nargs = nargs;
+ ppd->types = (Oid *) palloc(nargs * sizeof(Oid));
+ ppd->values = (Datum *) palloc(nargs * sizeof(Datum));
+ ppd->nulls = (char *) palloc(nargs * sizeof(char));
+ ppd->freevals = (bool *) palloc(nargs * sizeof(bool));
+
+ i = 0;
+ foreach(lc, params)
+ {
+ PLpgSQL_expr *param = (PLpgSQL_expr *) lfirst(lc);
+ bool isnull;
+
+ ppd->values[i] = exec_eval_expr(estate, param,
+ &isnull,
+ &ppd->types[i]);
+ ppd->nulls[i] = isnull ? 'n' : ' ';
+ ppd->freevals[i] = false;
+
+ /* pass-by-ref non null values must be copied into plpgsql context */
+ if (!isnull)
+ {
+ int16 typLen;
+ bool typByVal;
+
+ get_typlenbyval(ppd->types[i], &typLen, &typByVal);
+ if (!typByVal)
+ {
+ ppd->values[i] = datumCopy(ppd->values[i], typByVal, typLen);
+ ppd->freevals[i] = true;
+ }
+ }
+
+ exec_eval_cleanup(estate);
+
+ i++;
+ }
+
+ return ppd;
+}
+
+/*
+ * free_params_data --- pfree all pass-by-reference values used in USING clause
+ */
+static void
+free_params_data(PreparedParamsData *ppd)
+{
+ int i;
+
+ for (i = 0; i < ppd->nargs; i++)
+ {
+ if (ppd->freevals[i])
+ pfree(DatumGetPointer(ppd->values[i]));
+ }
+
+ pfree(ppd->types);
+ pfree(ppd->values);
+ pfree(ppd->nulls);
+ pfree(ppd->freevals);
+
+ pfree(ppd);
+}
+
+/*
+ * Open portal for dynamic query
+ */
+static Portal
+exec_dynquery_with_params(PLpgSQL_execstate *estate, PLpgSQL_expr *dynquery,
+ List *params)
+{
+ Portal portal;
+ Datum query;
+ bool isnull;
+ Oid restype;
+ char *querystr;
+
+ /*
+ * Evaluate the string expression after the EXECUTE keyword. Its result is
+ * the querystring we have to execute.
+ */
+ query = exec_eval_expr(estate, dynquery, &isnull, &restype);
+ if (isnull)
+ ereport(ERROR,
+ (errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
+ errmsg("query string argument of EXECUTE is null")));
+
+ /* Get the C-String representation */
+ querystr = convert_value_to_string(query, restype);
+
+ exec_eval_cleanup(estate);
+
+ /*
+ * Open an implicit cursor for the query. We use
+ * SPI_cursor_open_with_args even when there are no params, because this
+ * avoids making and freeing one copy of the plan.
+ */
+ if (params)
+ {
+ PreparedParamsData *ppd;
+
+ ppd = exec_eval_using_params(estate, params);
+ portal = SPI_cursor_open_with_args(NULL,
+ querystr,
+ ppd->nargs, ppd->types,
+ ppd->values, ppd->nulls,
+ estate->readonly_func, 0);
+ free_params_data(ppd);
+ }
+ else
+ {
+ portal = SPI_cursor_open_with_args(NULL,
+ querystr,
+ 0, NULL,
+ NULL, NULL,
+ estate->readonly_func, 0);
+ }
+
+ if (portal == NULL)
+ elog(ERROR, "could not open implicit cursor for query \"%s\": %s",
+ querystr, SPI_result_code_string(SPI_result));
+ pfree(querystr);
+
+ return portal;
+}
projects / postgresql / blobdiff