* pl_exec.c - Executor for the PL/pgSQL
* procedural language
*
- * Portions Copyright (c) 1996-2008, 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 1.207 2008/03/28 00:21:56 tgl Exp $
+ * $PostgreSQL: pgsql/src/pl/plpgsql/src/pl_exec.c,v 1.242 2009/06/04 18:33:07 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include "plpgsql.h"
-#include "pl.tab.h"
#include <ctype.h>
-#include "access/heapam.h"
#include "access/transam.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 "nodes/nodeFuncs.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"
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 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). In order to be sure
- * ExprContext callbacks are handled properly, each subtransaction has to have
- * its own such EState; hence we need a stack. We use a simple counter to
- * distinguish different instantiations of the EState, so that we can tell
- * whether we have a current copy of a prepared expression.
+ * 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 SimpleEstateStackEntry
+typedef struct SimpleEcontextStackEntry
{
- EState *xact_eval_estate; /* EState for current xact level */
- long int xact_estate_simple_id; /* ID for xact_eval_estate */
- SubTransactionId xact_subxid; /* ID for current subxact */
- struct SimpleEstateStackEntry *next; /* next stack entry up */
-} SimpleEstateStackEntry;
+ ExprContext *stack_econtext; /* a stacked econtext */
+ SubTransactionId xact_subxid; /* ID for current subxact */
+ struct SimpleEcontextStackEntry *next; /* next stack entry up */
+} SimpleEcontextStackEntry;
-static SimpleEstateStackEntry *simple_estate_stack = NULL;
-static long int simple_estate_id_counter = 0;
+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_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,
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 void eval_expr_params(PLpgSQL_execstate *estate,
+ PLpgSQL_expr *expr, Datum **p_values, char **p_nulls);
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 validate_tupdesc_compat(TupleDesc expected, TupleDesc returned,
+ const char *msg);
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);
/* ----------
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),
{
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")));
+ validate_tupdesc_compat(tupdesc, estate.rettupdesc,
+ "returned record type does not match expected record type");
break;
case TYPEFUNC_RECORD:
* sure it is labeled with the caller-supplied tuple type.
*/
estate.retval =
- PointerGetDatum(SPI_returntuple((HeapTuple) (estate.retval),
+ PointerGetDatum(SPI_returntuple((HeapTuple)DatumGetPointer(estate.retval),
tupdesc));
}
else
((*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);
/*
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),
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")));
+ validate_tupdesc_compat(trigdata->tg_relation->rd_att,
+ estate.rettupdesc,
+ "returned row structure does not match the structure of the triggering table");
/* Copy tuple to upper executor memory */
- rettup = SPI_copytuple((HeapTuple) (estate.retval));
+ rettup = SPI_copytuple((HeapTuple) DatumGetPointer(estate.retval));
}
/*
((*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);
/*
*/
if (estate->err_stmt != NULL)
{
- /*
- * translator: last %s is a phrase such as "during statement block
- * local variable initialization"
- */
+ /* translator: last %s is a phrase such as "during statement block local variable initialization" */
errcontext("PL/pgSQL function \"%s\" line %d %s",
estate->err_func->fn_name,
estate->err_stmt->lineno,
- gettext(estate->err_text));
+ _(estate->err_text));
}
else
{
- /*
- * translator: last %s is a phrase such as "while storing call
- * arguments into local variables"
- */
+ /* 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));
+ _(estate->err_text));
}
}
else if (estate->err_stmt != NULL)
MemoryContext oldcontext = CurrentMemoryContext;
ResourceOwner oldowner = CurrentResourceOwner;
ExprContext *old_eval_econtext = estate->eval_econtext;
- EState *old_eval_estate = estate->eval_estate;
- long int old_eval_estate_simple_id = estate->eval_estate_simple_id;
estate->err_text = gettext_noop("during statement block entry");
MemoryContextSwitchTo(oldcontext);
CurrentResourceOwner = oldowner;
- /* Revert to outer eval_econtext */
+ /*
+ * Revert to outer eval_econtext. (The inner one was automatically
+ * cleaned up during subxact exit.)
+ */
estate->eval_econtext = old_eval_econtext;
- estate->eval_estate = old_eval_estate;
- estate->eval_estate_simple_id = old_eval_estate_simple_id;
/*
* AtEOSubXact_SPI() should not have popped any SPI context, but
/* Revert to outer eval_econtext */
estate->eval_econtext = old_eval_econtext;
- estate->eval_estate = old_eval_estate;
- estate->eval_estate_simple_id = old_eval_estate_simple_id;
/*
* If AtEOSubXact_SPI() popped any SPI context of the subxact, it
state_var = (PLpgSQL_var *)
estate->datums[block->exceptions->sqlstate_varno];
- state_var->value = CStringGetTextDatum(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 = CStringGetTextDatum(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;
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;
}
}
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;
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_FORC:
+ rc = exec_stmt_forc(estate, (PLpgSQL_stmt_forc *) stmt);
+ break;
+
case PLPGSQL_STMT_EXIT:
rc = exec_stmt_exit(estate, (PLpgSQL_stmt_exit *) stmt);
break;
}
+/*-----------
+ * 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);
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
if (isnull)
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
- errmsg("lower bound of FOR loop cannot be NULL")));
+ 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);
if (isnull)
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
- errmsg("BY value of FOR loop cannot be NULL")));
+ errmsg("BY value of FOR loop cannot be null")));
step_value = DatumGetInt32(value);
exec_eval_cleanup(estate);
if (step_value <= 0)
*/
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)
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;
-
- /*
- * 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");
+ int rc;
/*
- * Open the implicit cursor for the statement and fetch the initial 10
- * rows.
+ * Open the implicit cursor for the statement using exec_run_select
*/
exec_run_select(estate, stmt->query, 0, &portal);
- SPI_cursor_fetch(portal, true, 10);
- tuptab = SPI_tuptable;
- n = SPI_processed;
-
/*
- * If the query didn't return any rows, set the target to NULL and return
- * with FOUND = false.
+ * Execute the loop
*/
- if (n == 0)
- exec_move_row(estate, rec, row, NULL, tuptab->tupdesc);
- else
- found = true; /* processed at least one tuple */
+ rc = exec_for_query(estate, (PLpgSQL_stmt_forq *) stmt, portal, true);
/*
- * Now do the loop
+ * Close the implicit cursor
*/
- while (n > 0)
- {
- for (i = 0; i < n; i++)
- {
- /*
- * Assign the tuple to the target
- */
- exec_move_row(estate, rec, row, tuptab->vals[i], tuptab->tupdesc);
+ SPI_cursor_close(portal);
- /*
- * 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;
- }
+ return rc;
+}
- /*
- * 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.
- */
- }
+/* ----------
+ * 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;
+ Portal portal;
+ int rc;
+ Datum *values;
+ char *nulls;
- /*
- * 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);
+ /* ----------
+ * 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 = TextDatumGetCString(curvar->value);
+ if (SPI_cursor_find(curname) != NULL)
+ ereport(ERROR,
+ (errcode(ERRCODE_DUPLICATE_CURSOR),
+ errmsg("cursor \"%s\" already in use", curname)));
+ }
- return rc;
- }
- }
+ /* ----------
+ * 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.
+ * ----------
+ */
+ PLpgSQL_stmt_execsql set_args;
- SPI_freetuptable(tuptab);
+ if (curvar->cursor_explicit_argrow < 0)
+ ereport(ERROR,
+ (errcode(ERRCODE_SYNTAX_ERROR),
+ errmsg("arguments given for cursor without arguments")));
- /*
- * Fetch the next 50 tuples
- */
- SPI_cursor_fetch(portal, true, 50);
- n = SPI_processed;
- tuptab = SPI_tuptable;
+ 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")));
}
+ query = curvar->cursor_explicit_expr;
+ Assert(query);
+
+ if (query->plan == NULL)
+ exec_prepare_plan(estate, query, curvar->cursor_options);
+
/*
- * Release last group of tuples
+ * Now build up the values and nulls arguments for SPI_execute_plan()
*/
- SPI_freetuptable(tuptab);
+ eval_expr_params(estate, query, &values, &nulls);
/*
- * Close the implicit cursor
+ * Open the cursor
*/
- SPI_cursor_close(portal);
+ portal = SPI_cursor_open(curname, query->plan, values, nulls,
+ estate->readonly_func);
+ if (portal == NULL)
+ elog(ERROR, "could not open cursor: %s",
+ SPI_result_code_string(SPI_result));
/*
- * 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.
+ * If cursor variable was NULL, store the generated portal name in it
*/
- exec_set_found(estate, found);
+ if (curname == NULL)
+ assign_text_var(curvar, portal->name);
+
+ /*
+ * 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.
+ */
+ rc = exec_for_query(estate, (PLpgSQL_stmt_forq *) stmt, portal, false);
+
+ /* ----------
+ * Close portal, and restore cursor variable if it was initially NULL.
+ * ----------
+ */
+ SPI_cursor_close(portal);
+
+ if (curname == NULL)
+ {
+ free_var(curvar);
+ curvar->value = (Datum) 0;
+ curvar->isnull = true;
+ }
+
+ pfree(values);
+ pfree(nulls);
+ if (curname)
+ pfree(curname);
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;
}
(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.")));
+ validate_tupdesc_compat(tupdesc, rec->tupdesc,
+ "wrong record type supplied in RETURN NEXT");
tuple = rec->tup;
}
break;
PLpgSQL_stmt_return_query *stmt)
{
Portal portal;
+ uint32 processed = 0;
if (!estate->retisset)
ereport(ERROR,
if (estate->tuple_store == NULL)
exec_init_tuple_store(estate);
- exec_run_select(estate, stmt->query, 0, &portal);
+ 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);
+ }
- if (!compatible_tupdesc(estate->rettupdesc, portal->tupDesc))
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("structure of query does not match function result type")));
+ validate_tupdesc_compat(estate->rettupdesc, portal->tupDesc,
+ "structure of query does not match function result type");
while (true)
{
HeapTuple tuple = SPI_tuptable->vals[i];
tuplestore_puttuple(estate->tuple_store, tuple);
+ processed++;
}
MemoryContextSwitchTo(old_cxt);
SPI_freetuptable(SPI_tuptable);
SPI_cursor_close(portal);
+ estate->eval_processed = processed;
+ exec_set_found(estate, processed != 0);
+
return PLPGSQL_RC_OK;
}
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;
-
- if (cp[1] == '%')
- {
- plpgsql_dstring_append_char(&ds, cp[1]);
- cp++;
- continue;
- }
+ err_code = plpgsql_recognize_err_condition(stmt->condname, true);
+ condname = pstrdup(stmt->condname);
+ }
- if (current_param == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_SYNTAX_ERROR),
- errmsg("too few parameters specified for RAISE")));
+ if (stmt->message)
+ {
+ PLpgSQL_dstring ds;
+ ListCell *current_param;
+ char *cp;
- paramvalue = exec_eval_expr(estate,
- (PLpgSQL_expr *) lfirst(current_param),
- ¶misnull,
- ¶mtypeid);
+ plpgsql_dstring_init(&ds);
+ current_param = list_head(stmt->params);
- if (paramisnull)
- extval = "<NULL>";
- else
- extval = convert_value_to_string(paramvalue, paramtypeid);
- plpgsql_dstring_append(&ds, extval);
- current_param = lnext(current_param);
- exec_eval_cleanup(estate);
- continue;
+ 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] == '%')
+ {
+ Oid paramtypeid;
+ Datum paramvalue;
+ bool paramisnull;
+ char *extval;
+
+ if (cp[1] == '%')
+ {
+ plpgsql_dstring_append_char(&ds, cp[1]);
+ cp++;
+ continue;
+ }
+
+ if (current_param == NULL)
+ ereport(ERROR,
+ (errcode(ERRCODE_SYNTAX_ERROR),
+ errmsg("too few parameters specified for RAISE")));
+
+ paramvalue = exec_eval_expr(estate,
+ (PLpgSQL_expr *) lfirst(current_param),
+ ¶misnull,
+ ¶mtypeid);
+
+ if (paramisnull)
+ extval = "<NULL>";
+ else
+ extval = convert_value_to_string(paramvalue, paramtypeid);
+ plpgsql_dstring_append(&ds, extval);
+ current_param = lnext(current_param);
+ exec_eval_cleanup(estate);
+ }
+ else
+ plpgsql_dstring_append_char(&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 = plpgsql_dstring_get(&ds);
+ /* No dstring_free here, 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;
}
exec_stmt_execsql(PLpgSQL_execstate *estate,
PLpgSQL_stmt_execsql *stmt)
{
- int i;
Datum *values;
char *nulls;
long tcount;
/*
* Now build up the values and nulls arguments for SPI_execute_plan()
*/
- 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] = ' ';
- }
+ eval_expr_params(estate, expr, &values, &nulls);
/*
* If we have INTO, then we only need one row back ... but if we have INTO
Assert(!stmt->mod_stmt);
break;
+ case SPI_OK_REWRITTEN:
+ Assert(!stmt->mod_stmt);
+ /*
+ * 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, false);
+ break;
+
default:
elog(ERROR, "SPI_execute_plan failed executing query \"%s\": %s",
expr->query, SPI_result_code_string(rc));
/* Determine if we assign to a record or a row */
if (stmt->rec != NULL)
- rec = (PLpgSQL_rec *) (estate->datums[stmt->rec->recno]);
+ rec = (PLpgSQL_rec *) (estate->datums[stmt->rec->dno]);
else if (stmt->row != NULL)
- row = (PLpgSQL_row *) (estate->datums[stmt->row->rowno]);
+ row = (PLpgSQL_row *) (estate->datums[stmt->row->dno]);
else
elog(ERROR, "unsupported target");
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.
+ * Execute the query without preparing a saved plan.
*/
- exec_res = SPI_execute(querystr, estate->readonly_func, 0);
+ if (stmt->params)
+ {
+ 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_UPDATE_RETURNING:
case SPI_OK_DELETE_RETURNING:
case SPI_OK_UTILITY:
+ case SPI_OK_REWRITTEN:
break;
case 0:
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;
}
/* Determine if we assign to a record or a row */
if (stmt->rec != NULL)
- rec = (PLpgSQL_rec *) (estate->datums[stmt->rec->recno]);
+ rec = (PLpgSQL_rec *) (estate->datums[stmt->rec->dno]);
else if (stmt->row != NULL)
- row = (PLpgSQL_row *) (estate->datums[stmt->row->rowno]);
+ row = (PLpgSQL_row *) (estate->datums[stmt->row->dno]);
else
elog(ERROR, "unsupported target");
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;
- SPIPlanPtr 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;
-
- /*
- * 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 */
-
- /*
- * Now do 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);
+ int rc;
- /*
- * Fetch the next 50 tuples
- */
- SPI_cursor_fetch(portal, true, 50);
- n = SPI_processed;
- tuptab = SPI_tuptable;
- }
+ portal = exec_dynquery_with_params(estate, stmt->query, stmt->params);
/*
- * Release last group of tuples
+ * Execute the loop
*/
- 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;
bool isnull;
-
/* ----------
* Get the cursor variable and if it has an assigned name, check
* that it's not in use currently.
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);
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 = CStringGetTextDatum(portal->name);
- curvar->isnull = false;
- curvar->freeval = true;
+ if (curname == NULL)
+ assign_text_var(curvar, portal->name);
return PLPGSQL_RC_OK;
}
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 ...;
- * ----------
+ /*
+ * Now build up the values and nulls arguments for SPI_execute_plan()
*/
- values = (Datum *) palloc(query->nparams * sizeof(Datum));
- nulls = (char *) palloc(query->nparams * sizeof(char));
-
- 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] = ' ';
- }
+ eval_expr_params(estate, query, &values, &nulls);
- /* ----------
+ /*
* Open the cursor
- * ----------
*/
portal = SPI_cursor_open(curname, query->plan, values, nulls,
estate->readonly_func);
elog(ERROR, "could not open cursor: %s",
SPI_result_code_string(SPI_result));
+ /*
+ * If cursor variable was NULL, store the generated portal name in it
+ */
+ if (curname == NULL)
+ assign_text_var(curvar, portal->name);
+
pfree(values);
pfree(nulls);
if (curname)
pfree(curname);
- /* ----------
- * Store the eventually assigned portal name in the cursor variable
- * ----------
- */
- free_var(curvar);
- curvar->value = CStringGetTextDatum(portal->name);
- curvar->isnull = false;
- curvar->freeval = true;
-
return PLPGSQL_RC_OK;
}
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)));
+ errmsg("cursor variable \"%s\" is null", curvar->refname)));
curname = TextDatumGetCString(curvar->value);
portal = SPI_cursor_find(curname);
if (isnull)
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
- errmsg("relative or absolute cursor position is NULL")));
+ errmsg("relative or absolute cursor position is null")));
exec_eval_cleanup(estate);
}
* ----------
*/
if (stmt->rec != NULL)
- rec = (PLpgSQL_rec *) (estate->datums[stmt->rec->recno]);
+ rec = (PLpgSQL_rec *) (estate->datums[stmt->rec->dno]);
else if (stmt->row != NULL)
- row = (PLpgSQL_row *) (estate->datums[stmt->row->rowno]);
+ row = (PLpgSQL_row *) (estate->datums[stmt->row->dno]);
else
elog(ERROR, "unsupported target");
n = SPI_processed;
/* ----------
- * Set the target and the global FOUND variable appropriately.
+ * Set the target appropriately.
* ----------
*/
if (n == 0)
- {
exec_move_row(estate, rec, row, NULL, tuptab->tupdesc);
- exec_set_found(estate, false);
- }
else
- {
exec_move_row(estate, rec, row, tuptab->vals[0], tuptab->tupdesc);
- exec_set_found(estate, true);
- }
SPI_freetuptable(tuptab);
}
/* Move the cursor */
SPI_scroll_cursor_move(portal, stmt->direction, how_many);
n = SPI_processed;
-
- /* Set the global FOUND variable appropriately. */
- exec_set_found(estate, n != 0);
}
+ /* Set the ROW_COUNT and the global FOUND variable appropriately. */
+ estate->eval_processed = n;
+ exec_set_found(estate, n != 0);
+
return PLPGSQL_RC_OK;
}
if (curvar->isnull)
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
- errmsg("cursor variable \"%s\" is NULL", curvar->refname)));
+ errmsg("cursor variable \"%s\" is null", curvar->refname)));
curname = TextDatumGetCString(curvar->value);
portal = SPI_cursor_find(curname);
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)));
/*
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);
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. */
bool *isNull,
Oid *rettype)
{
- Datum result;
+ Datum result = 0;
int rc;
/*
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;
int rc;
/*
* Now build up the values and nulls arguments for SPI_execute_plan()
*/
- 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] = ' ';
- }
+ eval_expr_params(estate, expr, &values, &nulls);
/*
* If a portal was requested, put the query into the portal
}
+/*
+ * 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().
Oid *rettype)
{
ExprContext *econtext = estate->eval_econtext;
+ LocalTransactionId curlxid = MyProc->lxid;
CachedPlanSource *plansource;
CachedPlan *cplan;
ParamListInfo paramLI;
int i;
- Snapshot saveActiveSnapshot;
+ MemoryContext oldcontext;
/*
* Forget it if expression wasn't simple before.
/*
* Prepare the expression for execution, if it's not been done already in
- * the current eval_estate. (This will be forced to happen if we called
+ * the current transaction. (This will be forced to happen if we called
* exec_simple_check_plan above.)
*/
- if (expr->expr_simple_id != estate->eval_estate_simple_id)
+ if (expr->expr_simple_lxid != curlxid)
{
expr->expr_simple_state = ExecPrepareExpr(expr->expr_simple_expr,
- estate->eval_estate);
- expr->expr_simple_id = estate->eval_estate_simple_id;
+ simple_eval_estate);
+ expr->expr_simple_lxid = curlxid;
}
/*
* updates made so far by our own function.
*/
SPI_push();
- saveActiveSnapshot = ActiveSnapshot;
- PG_TRY();
+ oldcontext = MemoryContextSwitchTo(econtext->ecxt_per_tuple_memory);
+ if (!estate->readonly_func)
{
- MemoryContext oldcontext;
+ CommandCounterIncrement();
+ PushActiveSnapshot(GetTransactionSnapshot());
+ }
- oldcontext = MemoryContextSwitchTo(econtext->ecxt_per_tuple_memory);
- if (!estate->readonly_func)
- {
- CommandCounterIncrement();
- ActiveSnapshot = CopySnapshot(GetTransactionSnapshot());
- }
+ /*
+ * Finally we can call the executor to evaluate the expression
+ */
+ *result = ExecEvalExpr(expr->expr_simple_state,
+ econtext,
+ isNull,
+ NULL);
+ MemoryContextSwitchTo(oldcontext);
- /*
- * Finally we can call the executor to evaluate the expression
- */
- *result = ExecEvalExpr(expr->expr_simple_state,
- econtext,
- isNull,
- NULL);
- MemoryContextSwitchTo(oldcontext);
- }
- PG_CATCH();
- {
- /* Restore global vars and propagate error */
- ActiveSnapshot = saveActiveSnapshot;
- PG_RE_THROW();
- }
- PG_END_TRY();
+ if (!estate->readonly_func)
+ PopActiveSnapshot();
- ActiveSnapshot = saveActiveSnapshot;
SPI_pop();
/*
}
+/*
+ * Build up the values and nulls arguments for SPI_execute_plan()
+ */
+static void
+eval_expr_params(PLpgSQL_execstate *estate,
+ PLpgSQL_expr *expr, Datum **p_values, char **p_nulls)
+{
+ Datum *values;
+ char *nulls;
+ int i;
+
+ *p_values = values = (Datum *) palloc(expr->nparams * sizeof(Datum));
+ *p_nulls = 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] = ' ';
+ }
+}
+
+
/* ----------
* exec_move_row Move one tuple's values into a record or row
* ----------
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;
* attributes of the tuple to the variables the row points to.
*
* NOTE: this code used to demand row->nfields ==
- * HeapTupleHeaderGetNatts(tup->t_data, but that's wrong. The tuple might
+ * 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
*/
if (row != NULL)
{
+ int td_natts = tupdesc ? tupdesc->natts : 0;
int t_natts;
int fnum;
int anum;
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++;
}
static char *
convert_value_to_string(Datum value, Oid valtype)
{
- char *str;
Oid typoutput;
bool typIsVarlena;
getTypeOutputInfo(valtype, &typoutput, &typIsVarlena);
-
- /*
- * We do SPI_push to allow the datatype output function to use SPI.
- * However we do not mess around with CommandCounterIncrement or advancing
- * the snapshot, which means that a stable output function would not see
- * updates made so far by our own function. The use-case for such
- * scenarios seems too narrow to justify the cycles that would be
- * expended.
- */
- SPI_push();
-
- str = OidOutputFunctionCall(typoutput, value);
-
- SPI_pop();
-
- return str;
+ return OidOutputFunctionCall(typoutput, value);
}
/* ----------
char *extval;
extval = convert_value_to_string(value, valtype);
-
- /* Allow input function to use SPI ... see notes above */
- SPI_push();
-
value = InputFunctionCall(reqinput, extval,
reqtypioparam, reqtypmod);
-
- SPI_pop();
-
pfree(extval);
}
else
{
- SPI_push();
-
value = InputFunctionCall(reqinput, NULL,
reqtypioparam, reqtypmod);
-
- SPI_pop();
}
}
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;
*/
expr->expr_simple_expr = tle->expr;
expr->expr_simple_state = NULL;
- expr->expr_simple_id = -1;
+ 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
+ * Validates compatibility of supplied TupleDesc pair by checking number and type
+ * of attributes.
*/
-static bool
-compatible_tupdesc(TupleDesc td1, TupleDesc td2)
+static void
+validate_tupdesc_compat(TupleDesc expected, TupleDesc returned, const char *msg)
{
- int i;
+ int i;
+ const char *dropped_column_type = gettext_noop("N/A (dropped column)");
- if (td1->natts != td2->natts)
- return false;
+ if (!expected || !returned)
+ ereport(ERROR,
+ (errcode(ERRCODE_DATATYPE_MISMATCH),
+ errmsg("%s", _(msg))));
- for (i = 0; i < td1->natts; i++)
- {
- if (td1->attrs[i]->atttypid != td2->attrs[i]->atttypid)
- return false;
- }
+ if (expected->natts != returned->natts)
+ ereport(ERROR,
+ (errcode(ERRCODE_DATATYPE_MISMATCH),
+ errmsg("%s", _(msg)),
+ errdetail("Number of returned columns (%d) does not match "
+ "expected column count (%d).",
+ returned->natts, expected->natts)));
- return true;
+ for (i = 0; i < expected->natts; i++)
+ if (expected->attrs[i]->atttypid != returned->attrs[i]->atttypid)
+ ereport(ERROR,
+ (errcode(ERRCODE_DATATYPE_MISMATCH),
+ errmsg("%s", _(msg)),
+ errdetail("Returned type %s does not match expected type "
+ "%s in column \"%s\".",
+ OidIsValid(returned->attrs[i]->atttypid) ?
+ format_type_be(returned->attrs[i]->atttypid) :
+ _(dropped_column_type),
+ OidIsValid(expected->attrs[i]->atttypid) ?
+ format_type_be(expected->attrs[i]->atttypid) :
+ _(dropped_column_type),
+ NameStr(expected->attrs[i]->attname))));
}
/* ----------
PLpgSQL_var *var;
var = (PLpgSQL_var *) (estate->datums[estate->found_varno]);
- var->value = (Datum) state;
+ 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 eval_estate too, if there's not one already
- * for the current (sub) transaction. The EState will be cleaned up at
- * (sub) transaction end.
+ * 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)
{
- SubTransactionId my_subxid = GetCurrentSubTransactionId();
- SimpleEstateStackEntry *entry = simple_estate_stack;
+ SimpleEcontextStackEntry *entry;
- /* Create new EState if not one for current subxact */
- if (entry == NULL ||
- entry->xact_subxid != my_subxid)
+ /*
+ * 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)
{
MemoryContext oldcontext;
- /* Stack entries are kept in TopTransactionContext for simplicity */
- entry = (SimpleEstateStackEntry *)
- MemoryContextAlloc(TopTransactionContext,
- sizeof(SimpleEstateStackEntry));
-
- /* But each EState should be a child of its CurTransactionContext */
- oldcontext = MemoryContextSwitchTo(CurTransactionContext);
- entry->xact_eval_estate = CreateExecutorState();
+ oldcontext = MemoryContextSwitchTo(TopTransactionContext);
+ simple_eval_estate = CreateExecutorState();
MemoryContextSwitchTo(oldcontext);
+ }
- /* Assign a reasonably-unique ID to this EState */
- entry->xact_estate_simple_id = simple_estate_id_counter++;
- entry->xact_subxid = my_subxid;
+ /*
+ * Create a child econtext for the current function.
+ */
+ estate->eval_econtext = CreateExprContext(simple_eval_estate);
- entry->next = simple_estate_stack;
- simple_estate_stack = entry;
- }
+ /*
+ * 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;
+}
+
+/*
+ * 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
+plpgsql_destroy_econtext(PLpgSQL_execstate *estate)
+{
+ SimpleEcontextStackEntry *next;
- /* Link plpgsql estate to it */
- estate->eval_estate = entry->xact_eval_estate;
- estate->eval_estate_simple_id = entry->xact_estate_simple_id;
+ Assert(simple_econtext_stack != NULL);
+ Assert(simple_econtext_stack->stack_econtext == estate->eval_econtext);
- /* And create a child econtext for the current function */
- estate->eval_econtext = CreateExprContext(estate->eval_estate);
+ next = simple_econtext_stack->next;
+ pfree(simple_econtext_stack);
+ simple_econtext_stack = next;
+
+ FreeExprContext(estate->eval_econtext);
+ estate->eval_econtext = NULL;
}
/*
* If we are doing a clean transaction shutdown, free the EState (so that
* any remaining resources will be released correctly). In an abort, we
* expect the regular abort recovery procedures to release everything of
- * interest. We don't need to free the individual stack entries since
- * TopTransactionContext is about to go away anyway.
- *
- * Note: if plpgsql_subxact_cb is doing its job, there should be at most
- * one stack entry, but we may as well code this as a loop.
+ * interest.
*/
if (event != XACT_EVENT_ABORT)
{
- while (simple_estate_stack != NULL)
- {
- FreeExecutorState(simple_estate_stack->xact_eval_estate);
- simple_estate_stack = simple_estate_stack->next;
- }
+ /* 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_estate_stack = NULL;
+ {
+ simple_econtext_stack = NULL;
+ simple_eval_estate = NULL;
+ }
}
/*
* plpgsql_subxact_cb --- post-subtransaction-commit-or-abort cleanup
*
- * If a simple-expression EState was created in the current subtransaction,
- * it has to be cleaned up.
+ * 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,
if (event == SUBXACT_EVENT_START_SUB)
return;
- if (simple_estate_stack != NULL &&
- simple_estate_stack->xact_subxid == mySubid)
+ while (simple_econtext_stack != NULL &&
+ simple_econtext_stack->xact_subxid == mySubid)
{
- SimpleEstateStackEntry *next;
+ SimpleEcontextStackEntry *next;
- if (event == SUBXACT_EVENT_COMMIT_SUB)
- FreeExecutorState(simple_estate_stack->xact_eval_estate);
- next = simple_estate_stack->next;
- pfree(simple_estate_stack);
- simple_estate_stack = next;
+ FreeExprContext(simple_econtext_stack->stack_econtext);
+ next = simple_econtext_stack->next;
+ pfree(simple_econtext_stack);
+ simple_econtext_stack = next;
}
}
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