* spi.c
* Server Programming Interface
*
- * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/executor/spi.c,v 1.79 2002/12/05 15:50:34 tgl Exp $
+ * $PostgreSQL: pgsql/src/backend/executor/spi.c,v 1.150 2006/04/04 19:35:34 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include "access/printtup.h"
#include "catalog/heap.h"
-#include "commands/portalcmds.h"
+#include "commands/trigger.h"
#include "executor/spi_priv.h"
#include "tcop/tcopprot.h"
#include "utils/lsyscache.h"
+#include "utils/memutils.h"
+#include "utils/typcache.h"
uint32 SPI_processed = 0;
static _SPI_connection *_SPI_stack = NULL;
static _SPI_connection *_SPI_current = NULL;
+static int _SPI_stack_depth = 0; /* allocated size of _SPI_stack */
static int _SPI_connected = -1;
static int _SPI_curid = -1;
-static int _SPI_execute(char *src, int tcount, _SPI_plan *plan);
-static int _SPI_pquery(QueryDesc *queryDesc, bool runit, int tcount);
+static void _SPI_prepare_plan(const char *src, _SPI_plan *plan);
static int _SPI_execute_plan(_SPI_plan *plan,
- Datum *Values, char *Nulls, int tcount);
+ Datum *Values, const char *Nulls,
+ Snapshot snapshot, Snapshot crosscheck_snapshot,
+ bool read_only, long tcount);
-static void _SPI_cursor_operation(Portal portal, bool forward, int count,
- CommandDest dest);
+static int _SPI_pquery(QueryDesc *queryDesc, long tcount);
+
+static void _SPI_error_callback(void *arg);
+
+static void _SPI_cursor_operation(Portal portal, bool forward, long count,
+ DestReceiver *dest);
static _SPI_plan *_SPI_copy_plan(_SPI_plan *plan, int location);
int
SPI_connect(void)
{
- _SPI_connection *new_SPI_stack;
+ int newdepth;
/*
- * When procedure called by Executor _SPI_curid expected to be equal
- * to _SPI_connected
+ * When procedure called by Executor _SPI_curid expected to be equal to
+ * _SPI_connected
*/
if (_SPI_curid != _SPI_connected)
return SPI_ERROR_CONNECT;
if (_SPI_stack == NULL)
{
- if (_SPI_connected != -1)
- elog(FATAL, "SPI_connect: no connection(s) expected");
- new_SPI_stack = (_SPI_connection *) malloc(sizeof(_SPI_connection));
+ if (_SPI_connected != -1 || _SPI_stack_depth != 0)
+ elog(ERROR, "SPI stack corrupted");
+ newdepth = 16;
+ _SPI_stack = (_SPI_connection *)
+ MemoryContextAlloc(TopTransactionContext,
+ newdepth * sizeof(_SPI_connection));
+ _SPI_stack_depth = newdepth;
}
else
{
- if (_SPI_connected <= -1)
- elog(FATAL, "SPI_connect: some connection(s) expected");
- new_SPI_stack = (_SPI_connection *) realloc(_SPI_stack,
- (_SPI_connected + 2) * sizeof(_SPI_connection));
+ if (_SPI_stack_depth <= 0 || _SPI_stack_depth <= _SPI_connected)
+ elog(ERROR, "SPI stack corrupted");
+ if (_SPI_stack_depth == _SPI_connected + 1)
+ {
+ newdepth = _SPI_stack_depth * 2;
+ _SPI_stack = (_SPI_connection *)
+ repalloc(_SPI_stack,
+ newdepth * sizeof(_SPI_connection));
+ _SPI_stack_depth = newdepth;
+ }
}
- if (new_SPI_stack == NULL)
- elog(ERROR, "Memory exhausted in SPI_connect");
-
/*
- * We' returning to procedure where _SPI_curid == _SPI_connected - 1
+ * We're entering procedure where _SPI_curid == _SPI_connected - 1
*/
- _SPI_stack = new_SPI_stack;
_SPI_connected++;
+ Assert(_SPI_connected >= 0 && _SPI_connected < _SPI_stack_depth);
_SPI_current = &(_SPI_stack[_SPI_connected]);
_SPI_current->processed = 0;
+ _SPI_current->lastoid = InvalidOid;
_SPI_current->tuptable = NULL;
+ _SPI_current->procCxt = NULL; /* in case we fail to create 'em */
+ _SPI_current->execCxt = NULL;
+ _SPI_current->connectSubid = GetCurrentSubTransactionId();
- /* Create memory contexts for this procedure */
+ /*
+ * Create memory contexts for this procedure
+ *
+ * XXX it would be better to use PortalContext as the parent context, but
+ * we may not be inside a portal (consider deferred-trigger execution).
+ * Perhaps CurTransactionContext would do? For now it doesn't matter
+ * because we clean up explicitly in AtEOSubXact_SPI().
+ */
_SPI_current->procCxt = AllocSetContextCreate(TopTransactionContext,
"SPI Proc",
- ALLOCSET_DEFAULT_MINSIZE,
- ALLOCSET_DEFAULT_INITSIZE,
- ALLOCSET_DEFAULT_MAXSIZE);
+ ALLOCSET_DEFAULT_MINSIZE,
+ ALLOCSET_DEFAULT_INITSIZE,
+ ALLOCSET_DEFAULT_MAXSIZE);
_SPI_current->execCxt = AllocSetContextCreate(TopTransactionContext,
"SPI Exec",
- ALLOCSET_DEFAULT_MINSIZE,
- ALLOCSET_DEFAULT_INITSIZE,
- ALLOCSET_DEFAULT_MAXSIZE);
+ ALLOCSET_DEFAULT_MINSIZE,
+ ALLOCSET_DEFAULT_INITSIZE,
+ ALLOCSET_DEFAULT_MAXSIZE);
/* ... and switch to procedure's context */
_SPI_current->savedcxt = MemoryContextSwitchTo(_SPI_current->procCxt);
/* Release memory used in procedure call */
MemoryContextDelete(_SPI_current->execCxt);
+ _SPI_current->execCxt = NULL;
MemoryContextDelete(_SPI_current->procCxt);
+ _SPI_current->procCxt = NULL;
+
+ /*
+ * Reset result variables, especially SPI_tuptable which is probably
+ * pointing at a just-deleted tuptable
+ */
+ SPI_processed = 0;
+ SPI_lastoid = InvalidOid;
+ SPI_tuptable = NULL;
/*
- * After _SPI_begin_call _SPI_connected == _SPI_curid. Now we are
- * closing connection to SPI and returning to upper Executor and so
- * _SPI_connected must be equal to _SPI_curid.
+ * After _SPI_begin_call _SPI_connected == _SPI_curid. Now we are closing
+ * connection to SPI and returning to upper Executor and so _SPI_connected
+ * must be equal to _SPI_curid.
*/
_SPI_connected--;
_SPI_curid--;
if (_SPI_connected == -1)
- {
- free(_SPI_stack);
- _SPI_stack = NULL;
_SPI_current = NULL;
- }
else
- {
- _SPI_connection *new_SPI_stack;
-
- new_SPI_stack = (_SPI_connection *) realloc(_SPI_stack,
- (_SPI_connected + 1) * sizeof(_SPI_connection));
- /* This could only fail with a pretty stupid malloc package ... */
- if (new_SPI_stack == NULL)
- elog(ERROR, "Memory exhausted in SPI_finish");
- _SPI_stack = new_SPI_stack;
_SPI_current = &(_SPI_stack[_SPI_connected]);
- }
return SPI_OK_FINISH;
-
}
/*
- * Clean up SPI state at transaction commit or abort (we don't care which).
+ * Clean up SPI state at transaction commit or abort.
*/
void
-AtEOXact_SPI(void)
+AtEOXact_SPI(bool isCommit)
{
/*
- * Note that memory contexts belonging to SPI stack entries will be
- * freed automatically, so we can ignore them here. We just need to
- * restore our static variables to initial state.
+ * Note that memory contexts belonging to SPI stack entries will be freed
+ * automatically, so we can ignore them here. We just need to restore our
+ * static variables to initial state.
*/
- if (_SPI_stack != NULL) /* there was abort */
- free(_SPI_stack);
+ if (isCommit && _SPI_connected != -1)
+ ereport(WARNING,
+ (errcode(ERRCODE_WARNING),
+ errmsg("transaction left non-empty SPI stack"),
+ errhint("Check for missing \"SPI_finish\" calls.")));
+
_SPI_current = _SPI_stack = NULL;
+ _SPI_stack_depth = 0;
_SPI_connected = _SPI_curid = -1;
SPI_processed = 0;
SPI_lastoid = InvalidOid;
SPI_tuptable = NULL;
}
+/*
+ * Clean up SPI state at subtransaction commit or abort.
+ *
+ * During commit, there shouldn't be any unclosed entries remaining from
+ * the current subtransaction; we emit a warning if any are found.
+ */
+void
+AtEOSubXact_SPI(bool isCommit, SubTransactionId mySubid)
+{
+ bool found = false;
+
+ while (_SPI_connected >= 0)
+ {
+ _SPI_connection *connection = &(_SPI_stack[_SPI_connected]);
+
+ if (connection->connectSubid != mySubid)
+ break; /* couldn't be any underneath it either */
+
+ found = true;
+
+ /*
+ * Release procedure memory explicitly (see note in SPI_connect)
+ */
+ if (connection->execCxt)
+ {
+ MemoryContextDelete(connection->execCxt);
+ connection->execCxt = NULL;
+ }
+ if (connection->procCxt)
+ {
+ MemoryContextDelete(connection->procCxt);
+ connection->procCxt = NULL;
+ }
+
+ /*
+ * Pop the stack entry and reset global variables. Unlike
+ * SPI_finish(), we don't risk switching to memory contexts that might
+ * be already gone.
+ */
+ _SPI_connected--;
+ _SPI_curid = _SPI_connected;
+ if (_SPI_connected == -1)
+ _SPI_current = NULL;
+ else
+ _SPI_current = &(_SPI_stack[_SPI_connected]);
+ SPI_processed = 0;
+ SPI_lastoid = InvalidOid;
+ SPI_tuptable = NULL;
+ }
+
+ if (found && isCommit)
+ ereport(WARNING,
+ (errcode(ERRCODE_WARNING),
+ errmsg("subtransaction left non-empty SPI stack"),
+ errhint("Check for missing \"SPI_finish\" calls.")));
+}
+
+
+/* Pushes SPI stack to allow recursive SPI calls */
void
SPI_push(void)
{
_SPI_curid++;
}
+/* Pops SPI stack to allow recursive SPI calls */
void
SPI_pop(void)
{
_SPI_curid--;
}
+/* Restore state of SPI stack after aborting a subtransaction */
+void
+SPI_restore_connection(void)
+{
+ Assert(_SPI_connected >= 0);
+ _SPI_curid = _SPI_connected - 1;
+}
+
+/* Parse, plan, and execute a query string */
int
-SPI_exec(char *src, int tcount)
+SPI_execute(const char *src, bool read_only, long tcount)
{
+ _SPI_plan plan;
int res;
if (src == NULL || tcount < 0)
if (res < 0)
return res;
- res = _SPI_execute(src, tcount, NULL);
+ plan.plancxt = NULL; /* doesn't have own context */
+ plan.query = src;
+ plan.nargs = 0;
+ plan.argtypes = NULL;
+
+ _SPI_prepare_plan(src, &plan);
+
+ res = _SPI_execute_plan(&plan, NULL, NULL,
+ InvalidSnapshot, InvalidSnapshot,
+ read_only, tcount);
_SPI_end_call(true);
return res;
}
+/* Obsolete version of SPI_execute */
int
-SPI_execp(void *plan, Datum *Values, char *Nulls, int tcount)
+SPI_exec(const char *src, long tcount)
+{
+ return SPI_execute(src, false, tcount);
+}
+
+/* Execute a previously prepared plan */
+int
+SPI_execute_plan(void *plan, Datum *Values, const char *Nulls,
+ bool read_only, long tcount)
{
int res;
if (res < 0)
return res;
- /* copy plan to current (executor) context */
- plan = (void *) _SPI_copy_plan(plan, _SPI_CPLAN_CURCXT);
+ res = _SPI_execute_plan((_SPI_plan *) plan,
+ Values, Nulls,
+ InvalidSnapshot, InvalidSnapshot,
+ read_only, tcount);
+
+ _SPI_end_call(true);
+ return res;
+}
+
+/* Obsolete version of SPI_execute_plan */
+int
+SPI_execp(void *plan, Datum *Values, const char *Nulls, long tcount)
+{
+ return SPI_execute_plan(plan, Values, Nulls, false, tcount);
+}
+
+/*
+ * SPI_execute_snapshot -- identical to SPI_execute_plan, except that we allow
+ * the caller to specify exactly which snapshots to use. This is currently
+ * not documented in spi.sgml because it is only intended for use by RI
+ * triggers.
+ *
+ * Passing snapshot == InvalidSnapshot will select the normal behavior of
+ * fetching a new snapshot for each query.
+ */
+int
+SPI_execute_snapshot(void *plan,
+ Datum *Values, const char *Nulls,
+ Snapshot snapshot, Snapshot crosscheck_snapshot,
+ bool read_only, long tcount)
+{
+ int res;
+
+ if (plan == NULL || tcount < 0)
+ return SPI_ERROR_ARGUMENT;
+
+ if (((_SPI_plan *) plan)->nargs > 0 && Values == NULL)
+ return SPI_ERROR_PARAM;
- res = _SPI_execute_plan((_SPI_plan *) plan, Values, Nulls, tcount);
+ res = _SPI_begin_call(true);
+ if (res < 0)
+ return res;
+
+ res = _SPI_execute_plan((_SPI_plan *) plan,
+ Values, Nulls,
+ snapshot, crosscheck_snapshot,
+ read_only, tcount);
_SPI_end_call(true);
return res;
}
void *
-SPI_prepare(char *src, int nargs, Oid *argtypes)
+SPI_prepare(const char *src, int nargs, Oid *argtypes)
{
- _SPI_plan *plan;
+ _SPI_plan plan;
+ _SPI_plan *result;
if (src == NULL || nargs < 0 || (nargs > 0 && argtypes == NULL))
{
if (SPI_result < 0)
return NULL;
- plan = (_SPI_plan *) palloc(sizeof(_SPI_plan)); /* Executor context */
- plan->argtypes = argtypes;
- plan->nargs = nargs;
+ plan.plancxt = NULL; /* doesn't have own context */
+ plan.query = src;
+ plan.nargs = nargs;
+ plan.argtypes = argtypes;
- SPI_result = _SPI_execute(src, 0, plan);
+ _SPI_prepare_plan(src, &plan);
- if (SPI_result >= 0) /* copy plan to procedure context */
- plan = _SPI_copy_plan(plan, _SPI_CPLAN_PROCXT);
- else
- plan = NULL;
+ /* copy plan to procedure context */
+ result = _SPI_copy_plan(&plan, _SPI_CPLAN_PROCXT);
_SPI_end_call(true);
- return (void *) plan;
+ return (void *) result;
}
void *
SPI_result = 0;
return (void *) newplan;
-
}
int
if (_SPI_curid + 1 == _SPI_connected) /* connected */
{
if (_SPI_current != &(_SPI_stack[_SPI_curid + 1]))
- elog(FATAL, "SPI: stack corrupted");
+ elog(ERROR, "SPI stack corrupted");
oldcxt = MemoryContextSwitchTo(_SPI_current->savedcxt);
}
return ctuple;
}
-TupleDesc
-SPI_copytupledesc(TupleDesc tupdesc)
-{
- MemoryContext oldcxt = NULL;
- TupleDesc ctupdesc;
-
- if (tupdesc == NULL)
- {
- SPI_result = SPI_ERROR_ARGUMENT;
- return NULL;
- }
-
- if (_SPI_curid + 1 == _SPI_connected) /* connected */
- {
- if (_SPI_current != &(_SPI_stack[_SPI_curid + 1]))
- elog(FATAL, "SPI: stack corrupted");
- oldcxt = MemoryContextSwitchTo(_SPI_current->savedcxt);
- }
-
- ctupdesc = CreateTupleDescCopy(tupdesc);
-
- if (oldcxt)
- MemoryContextSwitchTo(oldcxt);
-
- return ctupdesc;
-}
-
-TupleTableSlot *
-SPI_copytupleintoslot(HeapTuple tuple, TupleDesc tupdesc)
+HeapTupleHeader
+SPI_returntuple(HeapTuple tuple, TupleDesc tupdesc)
{
MemoryContext oldcxt = NULL;
- TupleTableSlot *cslot;
- HeapTuple ctuple;
- TupleDesc ctupdesc;
+ HeapTupleHeader dtup;
if (tuple == NULL || tupdesc == NULL)
{
return NULL;
}
+ /* For RECORD results, make sure a typmod has been assigned */
+ if (tupdesc->tdtypeid == RECORDOID &&
+ tupdesc->tdtypmod < 0)
+ assign_record_type_typmod(tupdesc);
+
if (_SPI_curid + 1 == _SPI_connected) /* connected */
{
if (_SPI_current != &(_SPI_stack[_SPI_curid + 1]))
- elog(FATAL, "SPI: stack corrupted");
+ elog(ERROR, "SPI stack corrupted");
oldcxt = MemoryContextSwitchTo(_SPI_current->savedcxt);
}
- ctuple = heap_copytuple(tuple);
- ctupdesc = CreateTupleDescCopy(tupdesc);
+ dtup = (HeapTupleHeader) palloc(tuple->t_len);
+ memcpy((char *) dtup, (char *) tuple->t_data, tuple->t_len);
- cslot = MakeTupleTableSlot();
- ExecSetSlotDescriptor(cslot, ctupdesc, true);
- cslot = ExecStoreTuple(ctuple, cslot, InvalidBuffer, true);
+ HeapTupleHeaderSetDatumLength(dtup, tuple->t_len);
+ HeapTupleHeaderSetTypeId(dtup, tupdesc->tdtypeid);
+ HeapTupleHeaderSetTypMod(dtup, tupdesc->tdtypmod);
if (oldcxt)
MemoryContextSwitchTo(oldcxt);
- return cslot;
+ return dtup;
}
HeapTuple
SPI_modifytuple(Relation rel, HeapTuple tuple, int natts, int *attnum,
- Datum *Values, char *Nulls)
+ Datum *Values, const char *Nulls)
{
MemoryContext oldcxt = NULL;
HeapTuple mtuple;
int numberOfAttributes;
Datum *v;
char *n;
- bool isnull;
int i;
- if (rel == NULL || tuple == NULL || natts <= 0 || attnum == NULL || Values == NULL)
+ if (rel == NULL || tuple == NULL || natts < 0 || attnum == NULL || Values == NULL)
{
SPI_result = SPI_ERROR_ARGUMENT;
return NULL;
if (_SPI_curid + 1 == _SPI_connected) /* connected */
{
if (_SPI_current != &(_SPI_stack[_SPI_curid + 1]))
- elog(FATAL, "SPI: stack corrupted");
+ elog(ERROR, "SPI stack corrupted");
oldcxt = MemoryContextSwitchTo(_SPI_current->savedcxt);
}
SPI_result = 0;
n = (char *) palloc(numberOfAttributes * sizeof(char));
/* fetch old values and nulls */
- for (i = 0; i < numberOfAttributes; i++)
- {
- v[i] = heap_getattr(tuple, i + 1, rel->rd_att, &isnull);
- n[i] = (isnull) ? 'n' : ' ';
- }
+ heap_deformtuple(tuple, rel->rd_att, v, n);
/* replace values and nulls */
for (i = 0; i < natts; i++)
mtuple = heap_formtuple(rel->rd_att, v, n);
/*
- * copy the identification info of the old tuple: t_ctid, t_self,
- * and OID (if any)
+ * copy the identification info of the old tuple: t_ctid, t_self, and
+ * OID (if any)
*/
mtuple->t_data->t_ctid = tuple->t_data->t_ctid;
mtuple->t_self = tuple->t_self;
mtuple->t_tableOid = tuple->t_tableOid;
- if (rel->rd_rel->relhasoids)
+ if (rel->rd_att->tdhasoid)
HeapTupleSetOid(mtuple, HeapTupleGetOid(tuple));
}
else
}
int
-SPI_fnumber(TupleDesc tupdesc, char *fname)
+SPI_fnumber(TupleDesc tupdesc, const char *fname)
{
int res;
Form_pg_attribute sysatt;
char *
SPI_getvalue(HeapTuple tuple, TupleDesc tupdesc, int fnumber)
{
+ char *result;
Datum origval,
- val,
- result;
+ val;
bool isnull;
Oid typoid,
- foutoid,
- typelem;
- int32 typmod;
+ foutoid;
bool typisvarlena;
SPI_result = 0;
return NULL;
if (fnumber > 0)
- {
typoid = tupdesc->attrs[fnumber - 1]->atttypid;
- typmod = tupdesc->attrs[fnumber - 1]->atttypmod;
- }
else
- {
typoid = (SystemAttributeDefinition(fnumber, true))->atttypid;
- typmod = -1;
- }
- if (!getTypeOutputInfo(typoid, &foutoid, &typelem, &typisvarlena))
- {
- SPI_result = SPI_ERROR_NOOUTFUNC;
- return NULL;
- }
+ getTypeOutputInfo(typoid, &foutoid, &typisvarlena);
/*
- * If we have a toasted datum, forcibly detoast it here to avoid
- * memory leakage inside the type's output routine.
+ * If we have a toasted datum, forcibly detoast it here to avoid memory
+ * leakage inside the type's output routine.
*/
if (typisvarlena)
val = PointerGetDatum(PG_DETOAST_DATUM(origval));
else
val = origval;
- result = OidFunctionCall3(foutoid,
- val,
- ObjectIdGetDatum(typelem),
- Int32GetDatum(typmod));
+ result = OidOutputFunctionCall(foutoid, val);
/* Clean up detoasted copy, if any */
if (val != origval)
pfree(DatumGetPointer(val));
- return DatumGetCString(result);
+ return result;
}
Datum
return pstrdup(RelationGetRelationName(rel));
}
+char *
+SPI_getnspname(Relation rel)
+{
+ return get_namespace_name(RelationGetNamespace(rel));
+}
+
void *
SPI_palloc(Size size)
{
if (_SPI_curid + 1 == _SPI_connected) /* connected */
{
if (_SPI_current != &(_SPI_stack[_SPI_curid + 1]))
- elog(FATAL, "SPI: stack corrupted");
+ elog(ERROR, "SPI stack corrupted");
oldcxt = MemoryContextSwitchTo(_SPI_current->savedcxt);
}
* Open a prepared SPI plan as a portal
*/
Portal
-SPI_cursor_open(char *name, void *plan, Datum *Values, char *Nulls)
+SPI_cursor_open(const char *name, void *plan,
+ Datum *Values, const char *Nulls,
+ bool read_only)
{
- static int unnamed_portal_count = 0;
-
_SPI_plan *spiplan = (_SPI_plan *) plan;
List *qtlist = spiplan->qtlist;
List *ptlist = spiplan->ptlist;
Query *queryTree;
Plan *planTree;
ParamListInfo paramLI;
- QueryDesc *queryDesc;
+ Snapshot snapshot;
MemoryContext oldcontext;
Portal portal;
- char portalname[64];
int k;
- /* Ensure that the plan contains only one regular SELECT query */
- if (length(ptlist) != 1 || length(qtlist) != 1)
- elog(ERROR, "cannot open multi-query plan as cursor");
- queryTree = (Query *) lfirst((List *) lfirst(qtlist));
- planTree = (Plan *) lfirst(ptlist);
-
- if (queryTree->commandType != CMD_SELECT)
- elog(ERROR, "plan in SPI_cursor_open() is not a SELECT");
- if (queryTree->isPortal)
- elog(ERROR, "plan in SPI_cursor_open() must NOT be a DECLARE already");
- else if (queryTree->into != NULL)
- elog(ERROR, "plan in SPI_cursor_open() must NOT be a SELECT INTO");
+ /* Ensure that the plan contains only one query */
+ if (list_length(ptlist) != 1 || list_length(qtlist) != 1)
+ ereport(ERROR,
+ (errcode(ERRCODE_INVALID_CURSOR_DEFINITION),
+ errmsg("cannot open multi-query plan as cursor")));
+ queryTree = (Query *) linitial((List *) linitial(qtlist));
+ planTree = (Plan *) linitial(ptlist);
- /* Increment CommandCounter to see changes made by now */
- CommandCounterIncrement();
+ /* Must be a query that returns tuples */
+ switch (queryTree->commandType)
+ {
+ case CMD_SELECT:
+ if (queryTree->into != NULL)
+ ereport(ERROR,
+ (errcode(ERRCODE_INVALID_CURSOR_DEFINITION),
+ errmsg("cannot open SELECT INTO query as cursor")));
+ break;
+ case CMD_UTILITY:
+ if (!UtilityReturnsTuples(queryTree->utilityStmt))
+ ereport(ERROR,
+ (errcode(ERRCODE_INVALID_CURSOR_DEFINITION),
+ errmsg("cannot open non-SELECT query as cursor")));
+ break;
+ default:
+ ereport(ERROR,
+ (errcode(ERRCODE_INVALID_CURSOR_DEFINITION),
+ errmsg("cannot open non-SELECT query as cursor")));
+ break;
+ }
- /* Reset SPI result */
+ /* Reset SPI result (note we deliberately don't touch lastoid) */
SPI_processed = 0;
SPI_tuptable = NULL;
_SPI_current->processed = 0;
_SPI_current->tuptable = NULL;
- if (name == NULL)
+ /* Create the portal */
+ if (name == NULL || name[0] == '\0')
{
- /* Make up a portal name if none given */
- for (;;)
- {
- unnamed_portal_count++;
- if (unnamed_portal_count < 0)
- unnamed_portal_count = 0;
- sprintf(portalname, "<unnamed cursor %d>", unnamed_portal_count);
- if (GetPortalByName(portalname) == NULL)
- break;
- }
-
- name = portalname;
+ /* Use a random nonconflicting name */
+ portal = CreateNewPortal();
}
else
{
- /* Ensure the portal doesn't exist already */
- portal = GetPortalByName(name);
- if (portal != NULL)
- elog(ERROR, "cursor \"%s\" already in use", name);
+ /* In this path, error if portal of same name already exists */
+ portal = CreatePortal(name, false, false);
}
- /* Create the portal */
- portal = CreatePortal(name);
- if (portal == NULL)
- elog(ERROR, "failed to create portal \"%s\"", name);
-
/* Switch to portals memory and copy the parsetree and plan to there */
oldcontext = MemoryContextSwitchTo(PortalGetHeapMemory(portal));
queryTree = copyObject(queryTree);
planTree = copyObject(planTree);
- /* Modify the parsetree to be a cursor */
- queryTree->isPortal = true;
- queryTree->into = makeNode(RangeVar);
- queryTree->into->relname = pstrdup(name);
- queryTree->isBinary = false;
-
/* If the plan has parameters, set them up */
if (spiplan->nargs > 0)
{
{
paramLI[k].kind = PARAM_NUM;
paramLI[k].id = k + 1;
+ paramLI[k].ptype = spiplan->argtypes[k];
paramLI[k].isnull = (Nulls && Nulls[k] == 'n');
if (paramLI[k].isnull)
{
else
paramLI = NULL;
- /* Create the QueryDesc object */
- queryDesc = CreateQueryDesc(queryTree, planTree, SPI, NULL,
- paramLI, false);
+ /*
+ * Set up the portal.
+ */
+ PortalDefineQuery(portal,
+ spiplan->query,
+ "SELECT", /* don't have the raw parse tree... */
+ list_make1(queryTree),
+ list_make1(planTree),
+ PortalGetHeapMemory(portal));
- /* Start the executor */
- ExecutorStart(queryDesc);
+ MemoryContextSwitchTo(oldcontext);
- /* Arrange to shut down the executor if portal is dropped */
- PortalSetQuery(portal, queryDesc, PortalCleanup);
+ /*
+ * Set up options for portal.
+ */
+ portal->cursorOptions &= ~(CURSOR_OPT_SCROLL | CURSOR_OPT_NO_SCROLL);
+ if (planTree == NULL || ExecSupportsBackwardScan(planTree))
+ portal->cursorOptions |= CURSOR_OPT_SCROLL;
+ else
+ portal->cursorOptions |= CURSOR_OPT_NO_SCROLL;
- /* Switch back to the callers memory context */
- MemoryContextSwitchTo(oldcontext);
+ /*
+ * Set up the snapshot to use. (PortalStart will do CopySnapshot, so we
+ * skip that here.)
+ */
+ if (read_only)
+ snapshot = ActiveSnapshot;
+ else
+ {
+ CommandCounterIncrement();
+ snapshot = GetTransactionSnapshot();
+ }
+
+ /*
+ * Start portal execution.
+ */
+ PortalStart(portal, paramLI, snapshot);
+
+ Assert(portal->strategy == PORTAL_ONE_SELECT ||
+ portal->strategy == PORTAL_UTIL_SELECT);
/* Return the created portal */
return portal;
* Find the portal of an existing open cursor
*/
Portal
-SPI_cursor_find(char *name)
+SPI_cursor_find(const char *name)
{
return GetPortalByName(name);
}
* Fetch rows in a cursor
*/
void
-SPI_cursor_fetch(Portal portal, bool forward, int count)
+SPI_cursor_fetch(Portal portal, bool forward, long count)
{
- _SPI_cursor_operation(portal, forward, count, SPI);
+ _SPI_cursor_operation(portal, forward, count,
+ CreateDestReceiver(DestSPI, NULL));
+ /* we know that the DestSPI receiver doesn't need a destroy call */
}
* Move in a cursor
*/
void
-SPI_cursor_move(Portal portal, bool forward, int count)
+SPI_cursor_move(Portal portal, bool forward, long count)
{
- _SPI_cursor_operation(portal, forward, count, None);
+ _SPI_cursor_operation(portal, forward, count, None_Receiver);
}
if (!PortalIsValid(portal))
elog(ERROR, "invalid portal in SPI cursor operation");
- PortalDrop(portal);
+ PortalDrop(portal, false);
+}
+
+/*
+ * Returns the Oid representing the type id for argument at argIndex. First
+ * parameter is at index zero.
+ */
+Oid
+SPI_getargtypeid(void *plan, int argIndex)
+{
+ if (plan == NULL || argIndex < 0 || argIndex >= ((_SPI_plan *) plan)->nargs)
+ {
+ SPI_result = SPI_ERROR_ARGUMENT;
+ return InvalidOid;
+ }
+ return ((_SPI_plan *) plan)->argtypes[argIndex];
+}
+
+/*
+ * Returns the number of arguments for the prepared plan.
+ */
+int
+SPI_getargcount(void *plan)
+{
+ if (plan == NULL)
+ {
+ SPI_result = SPI_ERROR_ARGUMENT;
+ return -1;
+ }
+ return ((_SPI_plan *) plan)->nargs;
+}
+
+/*
+ * Returns true if the plan contains exactly one command
+ * and that command originates from normal SELECT (i.e.
+ * *not* a SELECT ... INTO). In essence, the result indicates
+ * if the command can be used with SPI_cursor_open
+ *
+ * Parameters
+ * plan A plan previously prepared using SPI_prepare
+ */
+bool
+SPI_is_cursor_plan(void *plan)
+{
+ _SPI_plan *spiplan = (_SPI_plan *) plan;
+ List *qtlist;
+
+ if (spiplan == NULL)
+ {
+ SPI_result = SPI_ERROR_ARGUMENT;
+ return false;
+ }
+
+ qtlist = spiplan->qtlist;
+ if (list_length(spiplan->ptlist) == 1 && list_length(qtlist) == 1)
+ {
+ Query *queryTree = (Query *) linitial((List *) linitial(qtlist));
+
+ if (queryTree->commandType == CMD_SELECT && queryTree->into == NULL)
+ return true;
+ }
+ return false;
+}
+
+/*
+ * SPI_result_code_string --- convert any SPI return code to a string
+ *
+ * This is often useful in error messages. Most callers will probably
+ * only pass negative (error-case) codes, but for generality we recognize
+ * the success codes too.
+ */
+const char *
+SPI_result_code_string(int code)
+{
+ static char buf[64];
+
+ switch (code)
+ {
+ case SPI_ERROR_CONNECT:
+ return "SPI_ERROR_CONNECT";
+ case SPI_ERROR_COPY:
+ return "SPI_ERROR_COPY";
+ case SPI_ERROR_OPUNKNOWN:
+ return "SPI_ERROR_OPUNKNOWN";
+ case SPI_ERROR_UNCONNECTED:
+ return "SPI_ERROR_UNCONNECTED";
+ case SPI_ERROR_CURSOR:
+ return "SPI_ERROR_CURSOR";
+ case SPI_ERROR_ARGUMENT:
+ return "SPI_ERROR_ARGUMENT";
+ case SPI_ERROR_PARAM:
+ return "SPI_ERROR_PARAM";
+ case SPI_ERROR_TRANSACTION:
+ return "SPI_ERROR_TRANSACTION";
+ case SPI_ERROR_NOATTRIBUTE:
+ return "SPI_ERROR_NOATTRIBUTE";
+ case SPI_ERROR_NOOUTFUNC:
+ return "SPI_ERROR_NOOUTFUNC";
+ case SPI_ERROR_TYPUNKNOWN:
+ return "SPI_ERROR_TYPUNKNOWN";
+ case SPI_OK_CONNECT:
+ return "SPI_OK_CONNECT";
+ case SPI_OK_FINISH:
+ return "SPI_OK_FINISH";
+ case SPI_OK_FETCH:
+ return "SPI_OK_FETCH";
+ case SPI_OK_UTILITY:
+ return "SPI_OK_UTILITY";
+ case SPI_OK_SELECT:
+ return "SPI_OK_SELECT";
+ case SPI_OK_SELINTO:
+ return "SPI_OK_SELINTO";
+ case SPI_OK_INSERT:
+ return "SPI_OK_INSERT";
+ case SPI_OK_DELETE:
+ return "SPI_OK_DELETE";
+ case SPI_OK_UPDATE:
+ return "SPI_OK_UPDATE";
+ case SPI_OK_CURSOR:
+ return "SPI_OK_CURSOR";
+ }
+ /* Unrecognized code ... return something useful ... */
+ sprintf(buf, "Unrecognized SPI code %d", code);
+ return buf;
}
/* =================== private functions =================== */
/*
- * spi_printtup
- * store tuple retrieved by Executor into SPITupleTable
+ * spi_dest_startup
+ * Initialize to receive tuples from Executor into SPITupleTable
* of current SPI procedure
- *
*/
void
-spi_printtup(HeapTuple tuple, TupleDesc tupdesc, DestReceiver *self)
+spi_dest_startup(DestReceiver *self, int operation, TupleDesc typeinfo)
{
SPITupleTable *tuptable;
MemoryContext oldcxt;
* _SPI_connected
*/
if (_SPI_curid != _SPI_connected || _SPI_connected < 0)
- elog(FATAL, "SPI: improper call to spi_printtup");
+ elog(ERROR, "improper call to spi_dest_startup");
if (_SPI_current != &(_SPI_stack[_SPI_curid]))
- elog(FATAL, "SPI: stack corrupted in spi_printtup");
+ elog(ERROR, "SPI stack corrupted");
+
+ if (_SPI_current->tuptable != NULL)
+ elog(ERROR, "improper call to spi_dest_startup");
oldcxt = _SPI_procmem(); /* switch to procedure memory context */
+ tuptabcxt = AllocSetContextCreate(CurrentMemoryContext,
+ "SPI TupTable",
+ ALLOCSET_DEFAULT_MINSIZE,
+ ALLOCSET_DEFAULT_INITSIZE,
+ ALLOCSET_DEFAULT_MAXSIZE);
+ MemoryContextSwitchTo(tuptabcxt);
+
+ _SPI_current->tuptable = tuptable = (SPITupleTable *)
+ palloc(sizeof(SPITupleTable));
+ tuptable->tuptabcxt = tuptabcxt;
+ tuptable->alloced = tuptable->free = 128;
+ tuptable->vals = (HeapTuple *) palloc(tuptable->alloced * sizeof(HeapTuple));
+ tuptable->tupdesc = CreateTupleDescCopy(typeinfo);
+
+ MemoryContextSwitchTo(oldcxt);
+}
+
+/*
+ * spi_printtup
+ * store tuple retrieved by Executor into SPITupleTable
+ * of current SPI procedure
+ */
+void
+spi_printtup(TupleTableSlot *slot, DestReceiver *self)
+{
+ SPITupleTable *tuptable;
+ MemoryContext oldcxt;
+
+ /*
+ * When called by Executor _SPI_curid expected to be equal to
+ * _SPI_connected
+ */
+ if (_SPI_curid != _SPI_connected || _SPI_connected < 0)
+ elog(ERROR, "improper call to spi_printtup");
+ if (_SPI_current != &(_SPI_stack[_SPI_curid]))
+ elog(ERROR, "SPI stack corrupted");
+
tuptable = _SPI_current->tuptable;
if (tuptable == NULL)
- {
- tuptabcxt = AllocSetContextCreate(CurrentMemoryContext,
- "SPI TupTable",
- ALLOCSET_DEFAULT_MINSIZE,
- ALLOCSET_DEFAULT_INITSIZE,
- ALLOCSET_DEFAULT_MAXSIZE);
- MemoryContextSwitchTo(tuptabcxt);
-
- _SPI_current->tuptable = tuptable = (SPITupleTable *)
- palloc(sizeof(SPITupleTable));
- tuptable->tuptabcxt = tuptabcxt;
- tuptable->alloced = tuptable->free = 128;
- tuptable->vals = (HeapTuple *) palloc(tuptable->alloced * sizeof(HeapTuple));
- tuptable->tupdesc = CreateTupleDescCopy(tupdesc);
- }
- else
- {
- MemoryContextSwitchTo(tuptable->tuptabcxt);
+ elog(ERROR, "improper call to spi_printtup");
- if (tuptable->free == 0)
- {
- tuptable->free = 256;
- tuptable->alloced += tuptable->free;
- tuptable->vals = (HeapTuple *) repalloc(tuptable->vals,
- tuptable->alloced * sizeof(HeapTuple));
- }
+ oldcxt = MemoryContextSwitchTo(tuptable->tuptabcxt);
+
+ if (tuptable->free == 0)
+ {
+ tuptable->free = 256;
+ tuptable->alloced += tuptable->free;
+ tuptable->vals = (HeapTuple *) repalloc(tuptable->vals,
+ tuptable->alloced * sizeof(HeapTuple));
}
- tuptable->vals[tuptable->alloced - tuptable->free] = heap_copytuple(tuple);
+ tuptable->vals[tuptable->alloced - tuptable->free] =
+ ExecCopySlotTuple(slot);
(tuptable->free)--;
MemoryContextSwitchTo(oldcxt);
- return;
}
/*
*/
/*
- * Plan and optionally execute a querystring.
+ * Parse and plan a querystring.
+ *
+ * At entry, plan->argtypes and plan->nargs must be valid.
*
- * If plan != NULL, just prepare plan tree, else execute immediately.
+ * Query and plan lists are stored into *plan.
*/
-static int
-_SPI_execute(char *src, int tcount, _SPI_plan *plan)
+static void
+_SPI_prepare_plan(const char *src, _SPI_plan *plan)
{
- StringInfoData stri;
List *raw_parsetree_list;
List *query_list_list;
List *plan_list;
- List *list_item;
- int nargs = 0;
- Oid *argtypes = NULL;
- int res = 0;
-
- if (plan)
- {
- nargs = plan->nargs;
- argtypes = plan->argtypes;
- }
+ ListCell *list_item;
+ ErrorContextCallback spierrcontext;
+ Oid *argtypes = plan->argtypes;
+ int nargs = plan->nargs;
- /* Increment CommandCounter to see changes made by now */
+ /*
+ * Increment CommandCounter to see changes made by now. We must do this
+ * to be sure of seeing any schema changes made by a just-preceding SPI
+ * command. (But we don't bother advancing the snapshot, since the
+ * planner generally operates under SnapshotNow rules anyway.)
+ */
CommandCounterIncrement();
- /* Reset state (only needed in case string is empty) */
- SPI_processed = 0;
- SPI_lastoid = InvalidOid;
- SPI_tuptable = NULL;
- _SPI_current->tuptable = NULL;
+ /*
+ * Setup error traceback support for ereport()
+ */
+ spierrcontext.callback = _SPI_error_callback;
+ spierrcontext.arg = (void *) src;
+ spierrcontext.previous = error_context_stack;
+ error_context_stack = &spierrcontext;
/*
* Parse the request string into a list of raw parse trees.
*/
- initStringInfo(&stri);
- appendStringInfo(&stri, "%s", src);
-
- raw_parsetree_list = pg_parse_query(&stri, argtypes, nargs);
+ raw_parsetree_list = pg_parse_query(src);
/*
* Do parse analysis and rule rewrite for each raw parsetree.
*
- * We save the querytrees from each raw parsetree as a separate
- * sublist. This allows _SPI_execute_plan() to know where the
- * boundaries between original queries fall.
+ * We save the querytrees from each raw parsetree as a separate sublist.
+ * This allows _SPI_execute_plan() to know where the boundaries between
+ * original queries fall.
*/
query_list_list = NIL;
plan_list = NIL;
foreach(list_item, raw_parsetree_list)
{
Node *parsetree = (Node *) lfirst(list_item);
- CmdType origCmdType;
- bool foundOriginalQuery = false;
List *query_list;
- List *query_list_item;
- switch (nodeTag(parsetree))
- {
- case T_InsertStmt:
- origCmdType = CMD_INSERT;
- break;
- case T_DeleteStmt:
- origCmdType = CMD_DELETE;
- break;
- case T_UpdateStmt:
- origCmdType = CMD_UPDATE;
- break;
- case T_SelectStmt:
- origCmdType = CMD_SELECT;
- break;
- default:
- /* Otherwise, never match commandType */
- origCmdType = CMD_UNKNOWN;
- break;
- }
-
- if (plan)
- plan->origCmdType = origCmdType;
-
- query_list = pg_analyze_and_rewrite(parsetree);
+ query_list = pg_analyze_and_rewrite(parsetree, src, argtypes, nargs);
query_list_list = lappend(query_list_list, query_list);
- /* Reset state for each original parsetree */
- SPI_processed = 0;
- SPI_lastoid = InvalidOid;
- SPI_tuptable = NULL;
- _SPI_current->tuptable = NULL;
-
- foreach(query_list_item, query_list)
- {
- Query *queryTree = (Query *) lfirst(query_list_item);
- Plan *planTree;
- bool canSetResult;
- QueryDesc *qdesc;
-
- planTree = pg_plan_query(queryTree);
- plan_list = lappend(plan_list, planTree);
-
- /*
- * This query can set the SPI result if it is the original
- * query, or if it is an INSTEAD query of the same kind as the
- * original and we haven't yet seen the original query.
- */
- if (queryTree->querySource == QSRC_ORIGINAL)
- {
- canSetResult = true;
- foundOriginalQuery = true;
- }
- else if (!foundOriginalQuery &&
- queryTree->commandType == origCmdType &&
- (queryTree->querySource == QSRC_INSTEAD_RULE ||
- queryTree->querySource == QSRC_QUAL_INSTEAD_RULE))
- canSetResult = true;
- else
- canSetResult = false;
-
- if (queryTree->commandType == CMD_UTILITY)
- {
- if (IsA(queryTree->utilityStmt, CopyStmt))
- {
- CopyStmt *stmt = (CopyStmt *) queryTree->utilityStmt;
-
- if (stmt->filename == NULL)
- return SPI_ERROR_COPY;
- }
- else if (IsA(queryTree->utilityStmt, ClosePortalStmt) ||
- IsA(queryTree->utilityStmt, FetchStmt))
- return SPI_ERROR_CURSOR;
- else if (IsA(queryTree->utilityStmt, TransactionStmt))
- return SPI_ERROR_TRANSACTION;
- res = SPI_OK_UTILITY;
- if (plan == NULL)
- {
- ProcessUtility(queryTree->utilityStmt, None, NULL);
- CommandCounterIncrement();
- }
- }
- else if (plan == NULL)
- {
- qdesc = CreateQueryDesc(queryTree, planTree,
- canSetResult ? SPI : None,
- NULL, NULL, false);
- res = _SPI_pquery(qdesc, true, canSetResult ? tcount : 0);
- if (res < 0)
- return res;
- CommandCounterIncrement();
- }
- else
- {
- qdesc = CreateQueryDesc(queryTree, planTree,
- canSetResult ? SPI : None,
- NULL, NULL, false);
- res = _SPI_pquery(qdesc, false, 0);
- if (res < 0)
- return res;
- }
- }
+ plan_list = list_concat(plan_list,
+ pg_plan_queries(query_list, NULL, false));
}
- if (plan)
- {
- plan->qtlist = query_list_list;
- plan->ptlist = plan_list;
- }
+ plan->qtlist = query_list_list;
+ plan->ptlist = plan_list;
- return res;
+ /*
+ * Pop the error context stack
+ */
+ error_context_stack = spierrcontext.previous;
}
+/*
+ * Execute the given plan with the given parameter values
+ *
+ * snapshot: query snapshot to use, or InvalidSnapshot for the normal
+ * behavior of taking a new snapshot for each query.
+ * crosscheck_snapshot: for RI use, all others pass InvalidSnapshot
+ * read_only: TRUE for read-only execution (no CommandCounterIncrement)
+ * tcount: execution tuple-count limit, or 0 for none
+ */
static int
-_SPI_execute_plan(_SPI_plan *plan, Datum *Values, char *Nulls, int tcount)
+_SPI_execute_plan(_SPI_plan *plan, Datum *Values, const char *Nulls,
+ Snapshot snapshot, Snapshot crosscheck_snapshot,
+ bool read_only, long tcount)
{
- List *query_list_list = plan->qtlist;
- List *plan_list = plan->ptlist;
- List *query_list_list_item;
- int nargs = plan->nargs;
- int res = 0;
-
- /* Increment CommandCounter to see changes made by now */
- CommandCounterIncrement();
-
- /* Reset state (only needed in case string is empty) */
- SPI_processed = 0;
- SPI_lastoid = InvalidOid;
- SPI_tuptable = NULL;
- _SPI_current->tuptable = NULL;
-
- foreach(query_list_list_item, query_list_list)
+ volatile int res = 0;
+ volatile uint32 my_processed = 0;
+ volatile Oid my_lastoid = InvalidOid;
+ SPITupleTable *volatile my_tuptable = NULL;
+ Snapshot saveActiveSnapshot;
+
+ /* Be sure to restore ActiveSnapshot on error exit */
+ saveActiveSnapshot = ActiveSnapshot;
+ PG_TRY();
{
- List *query_list = lfirst(query_list_list_item);
- List *query_list_item;
- bool foundOriginalQuery = false;
+ List *query_list_list = plan->qtlist;
+ ListCell *plan_list_item = list_head(plan->ptlist);
+ ListCell *query_list_list_item;
+ ErrorContextCallback spierrcontext;
+ int nargs = plan->nargs;
+ ParamListInfo paramLI;
+
+ /* Convert parameters to form wanted by executor */
+ if (nargs > 0)
+ {
+ int k;
- /* Reset state for each original parsetree */
- SPI_processed = 0;
- SPI_lastoid = InvalidOid;
- SPI_tuptable = NULL;
- _SPI_current->tuptable = NULL;
+ paramLI = (ParamListInfo)
+ palloc0((nargs + 1) * sizeof(ParamListInfoData));
- foreach(query_list_item, query_list)
- {
- Query *queryTree = (Query *) lfirst(query_list_item);
- Plan *planTree;
- bool canSetResult;
- QueryDesc *qdesc;
-
- planTree = lfirst(plan_list);
- plan_list = lnext(plan_list);
-
- /*
- * This query can set the SPI result if it is the original
- * query, or if it is an INSTEAD query of the same kind as the
- * original and we haven't yet seen the original query.
- */
- if (queryTree->querySource == QSRC_ORIGINAL)
+ for (k = 0; k < nargs; k++)
{
- canSetResult = true;
- foundOriginalQuery = true;
+ paramLI[k].kind = PARAM_NUM;
+ paramLI[k].id = k + 1;
+ paramLI[k].ptype = plan->argtypes[k];
+ paramLI[k].isnull = (Nulls && Nulls[k] == 'n');
+ paramLI[k].value = Values[k];
}
- else if (!foundOriginalQuery &&
- queryTree->commandType == plan->origCmdType &&
- (queryTree->querySource == QSRC_INSTEAD_RULE ||
- queryTree->querySource == QSRC_QUAL_INSTEAD_RULE))
- canSetResult = true;
- else
- canSetResult = false;
+ paramLI[k].kind = PARAM_INVALID;
+ }
+ else
+ paramLI = NULL;
- if (queryTree->commandType == CMD_UTILITY)
- {
- res = SPI_OK_UTILITY;
- ProcessUtility(queryTree->utilityStmt, None, NULL);
- CommandCounterIncrement();
- }
- else
+ /*
+ * Setup error traceback support for ereport()
+ */
+ spierrcontext.callback = _SPI_error_callback;
+ spierrcontext.arg = (void *) plan->query;
+ spierrcontext.previous = error_context_stack;
+ error_context_stack = &spierrcontext;
+
+ foreach(query_list_list_item, query_list_list)
+ {
+ List *query_list = lfirst(query_list_list_item);
+ ListCell *query_list_item;
+
+ foreach(query_list_item, query_list)
{
- ParamListInfo paramLI;
+ Query *queryTree = (Query *) lfirst(query_list_item);
+ Plan *planTree;
+ QueryDesc *qdesc;
+ DestReceiver *dest;
- if (nargs > 0)
- {
- int k;
+ planTree = lfirst(plan_list_item);
+ plan_list_item = lnext(plan_list_item);
- paramLI = (ParamListInfo)
- palloc0((nargs + 1) * sizeof(ParamListInfoData));
+ _SPI_current->processed = 0;
+ _SPI_current->lastoid = InvalidOid;
+ _SPI_current->tuptable = NULL;
- for (k = 0; k < plan->nargs; k++)
+ if (queryTree->commandType == CMD_UTILITY)
+ {
+ if (IsA(queryTree->utilityStmt, CopyStmt))
{
- paramLI[k].kind = PARAM_NUM;
- paramLI[k].id = k + 1;
- paramLI[k].isnull = (Nulls && Nulls[k] == 'n');
- paramLI[k].value = Values[k];
+ CopyStmt *stmt = (CopyStmt *) queryTree->utilityStmt;
+
+ if (stmt->filename == NULL)
+ {
+ res = SPI_ERROR_COPY;
+ goto fail;
+ }
+ }
+ else if (IsA(queryTree->utilityStmt, DeclareCursorStmt) ||
+ IsA(queryTree->utilityStmt, ClosePortalStmt) ||
+ IsA(queryTree->utilityStmt, FetchStmt))
+ {
+ res = SPI_ERROR_CURSOR;
+ goto fail;
+ }
+ else if (IsA(queryTree->utilityStmt, TransactionStmt))
+ {
+ res = SPI_ERROR_TRANSACTION;
+ goto fail;
}
- paramLI[k].kind = PARAM_INVALID;
+ }
+
+ if (read_only && !QueryIsReadOnly(queryTree))
+ ereport(ERROR,
+ (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+ /* translator: %s is a SQL statement name */
+ errmsg("%s is not allowed in a non-volatile function",
+ CreateQueryTag(queryTree))));
+
+ /*
+ * If not read-only mode, advance the command counter before
+ * each command.
+ */
+ if (!read_only)
+ CommandCounterIncrement();
+
+ dest = CreateDestReceiver(queryTree->canSetTag ? DestSPI : DestNone,
+ NULL);
+
+ if (snapshot == InvalidSnapshot)
+ {
+ /*
+ * Default read_only behavior is to use the entry-time
+ * ActiveSnapshot; if read-write, grab a full new snap.
+ */
+ if (read_only)
+ ActiveSnapshot = CopySnapshot(saveActiveSnapshot);
+ else
+ ActiveSnapshot = CopySnapshot(GetTransactionSnapshot());
}
else
- paramLI = NULL;
+ {
+ /*
+ * We interpret read_only with a specified snapshot to be
+ * exactly that snapshot, but read-write means use the
+ * snap with advancing of command ID.
+ */
+ ActiveSnapshot = CopySnapshot(snapshot);
+ if (!read_only)
+ ActiveSnapshot->curcid = GetCurrentCommandId();
+ }
- qdesc = CreateQueryDesc(queryTree, planTree,
- canSetResult ? SPI : None,
- NULL, paramLI, false);
- res = _SPI_pquery(qdesc, true, canSetResult ? tcount : 0);
+ if (queryTree->commandType == CMD_UTILITY)
+ {
+ ProcessUtility(queryTree->utilityStmt, paramLI,
+ dest, NULL);
+ res = SPI_OK_UTILITY;
+ }
+ else
+ {
+ qdesc = CreateQueryDesc(queryTree, planTree,
+ ActiveSnapshot,
+ crosscheck_snapshot,
+ dest,
+ paramLI, false);
+ res = _SPI_pquery(qdesc,
+ queryTree->canSetTag ? tcount : 0);
+ FreeQueryDesc(qdesc);
+ }
+ FreeSnapshot(ActiveSnapshot);
+ ActiveSnapshot = NULL;
+
+ /*
+ * The last canSetTag query sets the auxiliary values returned
+ * to the caller. Be careful to free any tuptables not
+ * returned, to avoid intratransaction memory leak.
+ */
+ if (queryTree->canSetTag)
+ {
+ my_processed = _SPI_current->processed;
+ my_lastoid = _SPI_current->lastoid;
+ SPI_freetuptable(my_tuptable);
+ my_tuptable = _SPI_current->tuptable;
+ }
+ else
+ {
+ SPI_freetuptable(_SPI_current->tuptable);
+ _SPI_current->tuptable = NULL;
+ }
+ /* we know that the receiver doesn't need a destroy call */
if (res < 0)
- return res;
- CommandCounterIncrement();
+ goto fail;
}
}
+
+fail:
+
+ /*
+ * Pop the error context stack
+ */
+ error_context_stack = spierrcontext.previous;
+ }
+ PG_CATCH();
+ {
+ /* Restore global vars and propagate error */
+ ActiveSnapshot = saveActiveSnapshot;
+ PG_RE_THROW();
}
+ PG_END_TRY();
+
+ ActiveSnapshot = saveActiveSnapshot;
+
+ /* Save results for caller */
+ SPI_processed = my_processed;
+ SPI_lastoid = my_lastoid;
+ SPI_tuptable = my_tuptable;
return res;
}
static int
-_SPI_pquery(QueryDesc *queryDesc, bool runit, int tcount)
+_SPI_pquery(QueryDesc *queryDesc, long tcount)
{
- Query *parseTree = queryDesc->parsetree;
int operation = queryDesc->operation;
- CommandDest dest = queryDesc->dest;
- bool isRetrieveIntoPortal = false;
- bool isRetrieveIntoRelation = false;
- char *intoName = NULL;
int res;
- Oid save_lastoid;
switch (operation)
{
case CMD_SELECT:
res = SPI_OK_SELECT;
- if (parseTree->isPortal)
+ if (queryDesc->parsetree->into) /* select into table? */
{
- isRetrieveIntoPortal = true;
- intoName = parseTree->into->relname;
- parseTree->isBinary = false; /* */
-
- return SPI_ERROR_CURSOR;
-
+ res = SPI_OK_SELINTO;
+ queryDesc->dest = None_Receiver; /* don't output results */
}
- else if (parseTree->into != NULL) /* select into table */
+ else if (queryDesc->dest->mydest != DestSPI)
{
- res = SPI_OK_SELINTO;
- isRetrieveIntoRelation = true;
- queryDesc->dest = None; /* */
+ /* Don't return SPI_OK_SELECT if we're discarding result */
+ res = SPI_OK_UTILITY;
}
break;
case CMD_INSERT:
return SPI_ERROR_OPUNKNOWN;
}
- if (!runit) /* plan preparation, don't execute */
- return res;
-
#ifdef SPI_EXECUTOR_STATS
if (ShowExecutorStats)
ResetUsage();
#endif
- ExecutorStart(queryDesc);
+ AfterTriggerBeginQuery();
- /*
- * Don't work currently --- need to rearrange callers so that we
- * prepare the portal before doing ExecutorStart() etc. See
- * pquery.c for the correct order of operations.
- */
- if (isRetrieveIntoPortal)
- elog(FATAL, "SPI_select: retrieve into portal not implemented");
+ ExecutorStart(queryDesc, 0);
- ExecutorRun(queryDesc, ForwardScanDirection, (long) tcount);
+ ExecutorRun(queryDesc, ForwardScanDirection, tcount);
_SPI_current->processed = queryDesc->estate->es_processed;
- save_lastoid = queryDesc->estate->es_lastoid;
+ _SPI_current->lastoid = queryDesc->estate->es_lastoid;
- if (operation == CMD_SELECT && queryDesc->dest == SPI)
+ if (operation == CMD_SELECT && queryDesc->dest->mydest == DestSPI)
{
if (_SPI_checktuples())
- elog(FATAL, "SPI_select: # of processed tuples check failed");
+ elog(ERROR, "consistency check on SPI tuple count failed");
}
+ /* Take care of any queued AFTER triggers */
+ AfterTriggerEndQuery(queryDesc->estate);
+
ExecutorEnd(queryDesc);
#ifdef SPI_EXECUTOR_STATS
ShowUsage("SPI EXECUTOR STATS");
#endif
- if (dest == SPI)
- {
- SPI_processed = _SPI_current->processed;
- SPI_lastoid = save_lastoid;
- SPI_tuptable = _SPI_current->tuptable;
- }
- queryDesc->dest = dest;
-
return res;
+}
+/*
+ * _SPI_error_callback
+ *
+ * Add context information when a query invoked via SPI fails
+ */
+static void
+_SPI_error_callback(void *arg)
+{
+ const char *query = (const char *) arg;
+ int syntaxerrposition;
+
+ /*
+ * If there is a syntax error position, convert to internal syntax error;
+ * otherwise treat the query as an item of context stack
+ */
+ syntaxerrposition = geterrposition();
+ if (syntaxerrposition > 0)
+ {
+ errposition(0);
+ internalerrposition(syntaxerrposition);
+ internalerrquery(query);
+ }
+ else
+ errcontext("SQL statement \"%s\"", query);
}
/*
* Do a FETCH or MOVE in a cursor
*/
static void
-_SPI_cursor_operation(Portal portal, bool forward, int count,
- CommandDest dest)
+_SPI_cursor_operation(Portal portal, bool forward, long count,
+ DestReceiver *dest)
{
- QueryDesc *querydesc;
- EState *estate;
- MemoryContext oldcontext;
- ScanDirection direction;
- CommandDest olddest;
+ long nfetched;
/* Check that the portal is valid */
if (!PortalIsValid(portal))
elog(ERROR, "invalid portal in SPI cursor operation");
/* Push the SPI stack */
- _SPI_begin_call(true);
+ if (_SPI_begin_call(true) < 0)
+ elog(ERROR, "SPI cursor operation called while not connected");
- /* Reset the SPI result */
+ /* Reset the SPI result (note we deliberately don't touch lastoid) */
SPI_processed = 0;
SPI_tuptable = NULL;
_SPI_current->processed = 0;
_SPI_current->tuptable = NULL;
- /* Switch to the portals memory context */
- oldcontext = MemoryContextSwitchTo(PortalGetHeapMemory(portal));
-
- querydesc = PortalGetQueryDesc(portal);
- estate = querydesc->estate;
-
- /* Save the queries command destination and set it to SPI (for fetch) */
- /* or None (for move) */
- olddest = querydesc->dest;
- querydesc->dest = dest;
+ /* Run the cursor */
+ nfetched = PortalRunFetch(portal,
+ forward ? FETCH_FORWARD : FETCH_BACKWARD,
+ count,
+ dest);
- /* Run the executor like PerformPortalFetch and remember states */
- if (forward)
- {
- if (portal->atEnd)
- direction = NoMovementScanDirection;
- else
- direction = ForwardScanDirection;
-
- ExecutorRun(querydesc, direction, (long) count);
-
- if (estate->es_processed > 0)
- portal->atStart = false; /* OK to back up now */
- if (count <= 0 || (int) estate->es_processed < count)
- portal->atEnd = true; /* we retrieved 'em all */
- }
- else
- {
- if (portal->atStart)
- direction = NoMovementScanDirection;
- else
- direction = BackwardScanDirection;
-
- ExecutorRun(querydesc, direction, (long) count);
-
- if (estate->es_processed > 0)
- portal->atEnd = false; /* OK to go forward now */
- if (count <= 0 || (int) estate->es_processed < count)
- portal->atStart = true; /* we retrieved 'em all */
- }
-
- _SPI_current->processed = estate->es_processed;
-
- /* Restore the old command destination and switch back to callers */
- /* memory context */
- querydesc->dest = olddest;
- MemoryContextSwitchTo(oldcontext);
+ /*
+ * Think not to combine this store with the preceding function call. If
+ * the portal contains calls to functions that use SPI, then SPI_stack is
+ * likely to move around while the portal runs. When control returns,
+ * _SPI_current will point to the correct stack entry... but the pointer
+ * may be different than it was beforehand. So we must be sure to re-fetch
+ * the pointer after the function call completes.
+ */
+ _SPI_current->processed = nfetched;
- if (dest == SPI && _SPI_checktuples())
- elog(FATAL, "SPI_fetch: # of processed tuples check failed");
+ if (dest->mydest == DestSPI && _SPI_checktuples())
+ elog(ERROR, "consistency check on SPI tuple count failed");
/* Put the result into place for access by caller */
SPI_processed = _SPI_current->processed;
static MemoryContext
-_SPI_execmem()
+_SPI_execmem(void)
{
return MemoryContextSwitchTo(_SPI_current->execCxt);
}
static MemoryContext
-_SPI_procmem()
+_SPI_procmem(void)
{
return MemoryContextSwitchTo(_SPI_current->procCxt);
}
/*
- * _SPI_begin_call
- *
+ * _SPI_begin_call: begin a SPI operation within a connected procedure
*/
static int
_SPI_begin_call(bool execmem)
return SPI_ERROR_UNCONNECTED;
_SPI_curid++;
if (_SPI_current != &(_SPI_stack[_SPI_curid]))
- elog(FATAL, "SPI: stack corrupted");
+ elog(ERROR, "SPI stack corrupted");
if (execmem) /* switch to the Executor memory context */
_SPI_execmem();
return 0;
}
+/*
+ * _SPI_end_call: end a SPI operation within a connected procedure
+ *
+ * Note: this currently has no failure return cases, so callers don't check
+ */
static int
_SPI_end_call(bool procmem)
{
SPITupleTable *tuptable = _SPI_current->tuptable;
bool failed = false;
- if (processed == 0)
- {
- if (tuptable != NULL)
- failed = true;
- }
- else
- {
- /* some tuples were processed */
- if (tuptable == NULL) /* spi_printtup was not called */
- failed = true;
- else if (processed != (tuptable->alloced - tuptable->free))
- failed = true;
- }
+ if (tuptable == NULL) /* spi_dest_startup was not called */
+ failed = true;
+ else if (processed != (tuptable->alloced - tuptable->free))
+ failed = true;
return failed;
}
else if (location == _SPI_CPLAN_TOPCXT)
parentcxt = TopMemoryContext;
else
+ /* (this case not currently used) */
parentcxt = CurrentMemoryContext;
/*
- * Create a memory context for the plan. We don't expect the plan to
- * be very large, so use smaller-than-default alloc parameters.
+ * Create a memory context for the plan. We don't expect the plan to be
+ * very large, so use smaller-than-default alloc parameters.
*/
plancxt = AllocSetContextCreate(parentcxt,
"SPI Plan",
- 1024,
- 1024,
- ALLOCSET_DEFAULT_MAXSIZE);
+ ALLOCSET_SMALL_MINSIZE,
+ ALLOCSET_SMALL_INITSIZE,
+ ALLOCSET_SMALL_MAXSIZE);
oldcxt = MemoryContextSwitchTo(plancxt);
/* Copy the SPI plan into its own context */
newplan = (_SPI_plan *) palloc(sizeof(_SPI_plan));
newplan->plancxt = plancxt;
+ newplan->query = pstrdup(plan->query);
newplan->qtlist = (List *) copyObject(plan->qtlist);
newplan->ptlist = (List *) copyObject(plan->ptlist);
newplan->nargs = plan->nargs;
}
else
newplan->argtypes = NULL;
- newplan->origCmdType = plan->origCmdType;
MemoryContextSwitchTo(oldcxt);
projects / postgresql / blobdiff