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are now both invoked once per received SQL command (raw parsetree) from pg_exec_query_string. BeginCommand is actually just an empty routine at the moment --- all its former operations have been pushed into tuple receiver setup routines in printtup.c. This makes for a clean distinction between BeginCommand/EndCommand (once per command) and the tuple receiver setup/teardown routines (once per ExecutorRun call), whereas the old code was quite ad hoc. Along the way, clean up the calling conventions for ExecutorRun a little bit.
1444 lines
32 KiB
C
1444 lines
32 KiB
C
/*-------------------------------------------------------------------------
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*
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* spi.c
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* Server Programming Interface
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*
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* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/executor/spi.c,v 1.67 2002/02/27 19:34:59 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "access/printtup.h"
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#include "catalog/heap.h"
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#include "commands/command.h"
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#include "executor/spi_priv.h"
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#include "tcop/tcopprot.h"
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#include "utils/lsyscache.h"
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uint32 SPI_processed = 0;
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Oid SPI_lastoid = InvalidOid;
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SPITupleTable *SPI_tuptable = NULL;
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int SPI_result;
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static _SPI_connection *_SPI_stack = NULL;
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static _SPI_connection *_SPI_current = NULL;
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static int _SPI_connected = -1;
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static int _SPI_curid = -1;
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static int _SPI_execute(char *src, int tcount, _SPI_plan *plan);
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static int _SPI_pquery(QueryDesc *queryDesc, EState *state, int tcount);
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static int _SPI_execute_plan(_SPI_plan *plan,
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Datum *Values, char *Nulls, int tcount);
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static void _SPI_cursor_operation(Portal portal, bool forward, int count,
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CommandDest dest);
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static _SPI_plan *_SPI_copy_plan(_SPI_plan *plan, int location);
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static int _SPI_begin_call(bool execmem);
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static int _SPI_end_call(bool procmem);
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static MemoryContext _SPI_execmem(void);
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static MemoryContext _SPI_procmem(void);
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static bool _SPI_checktuples(void);
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/* =================== interface functions =================== */
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int
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SPI_connect(void)
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{
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_SPI_connection *new_SPI_stack;
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/*
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* When procedure called by Executor _SPI_curid expected to be equal
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* to _SPI_connected
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*/
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if (_SPI_curid != _SPI_connected)
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return SPI_ERROR_CONNECT;
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if (_SPI_stack == NULL)
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{
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if (_SPI_connected != -1)
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elog(FATAL, "SPI_connect: no connection(s) expected");
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new_SPI_stack = (_SPI_connection *) malloc(sizeof(_SPI_connection));
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}
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else
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{
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if (_SPI_connected <= -1)
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elog(FATAL, "SPI_connect: some connection(s) expected");
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new_SPI_stack = (_SPI_connection *) realloc(_SPI_stack,
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(_SPI_connected + 2) * sizeof(_SPI_connection));
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}
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if (new_SPI_stack == NULL)
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elog(ERROR, "Memory exhausted in SPI_connect");
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/*
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* We' returning to procedure where _SPI_curid == _SPI_connected - 1
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*/
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_SPI_stack = new_SPI_stack;
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_SPI_connected++;
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_SPI_current = &(_SPI_stack[_SPI_connected]);
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_SPI_current->qtlist = NULL;
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_SPI_current->processed = 0;
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_SPI_current->tuptable = NULL;
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/* Create memory contexts for this procedure */
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_SPI_current->procCxt = AllocSetContextCreate(TopTransactionContext,
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"SPI Proc",
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ALLOCSET_DEFAULT_MINSIZE,
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ALLOCSET_DEFAULT_INITSIZE,
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ALLOCSET_DEFAULT_MAXSIZE);
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_SPI_current->execCxt = AllocSetContextCreate(TopTransactionContext,
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"SPI Exec",
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ALLOCSET_DEFAULT_MINSIZE,
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ALLOCSET_DEFAULT_INITSIZE,
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ALLOCSET_DEFAULT_MAXSIZE);
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/* ... and switch to procedure's context */
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_SPI_current->savedcxt = MemoryContextSwitchTo(_SPI_current->procCxt);
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_SPI_current->savedId = GetScanCommandId();
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SetScanCommandId(GetCurrentCommandId());
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return SPI_OK_CONNECT;
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}
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int
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SPI_finish(void)
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{
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int res;
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res = _SPI_begin_call(false); /* live in procedure memory */
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if (res < 0)
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return res;
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/* Restore memory context as it was before procedure call */
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MemoryContextSwitchTo(_SPI_current->savedcxt);
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/* Release memory used in procedure call */
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MemoryContextDelete(_SPI_current->execCxt);
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MemoryContextDelete(_SPI_current->procCxt);
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SetScanCommandId(_SPI_current->savedId);
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/*
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* After _SPI_begin_call _SPI_connected == _SPI_curid. Now we are
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* closing connection to SPI and returning to upper Executor and so
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* _SPI_connected must be equal to _SPI_curid.
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*/
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_SPI_connected--;
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_SPI_curid--;
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if (_SPI_connected == -1)
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{
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free(_SPI_stack);
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_SPI_stack = NULL;
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_SPI_current = NULL;
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}
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else
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{
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_SPI_connection *new_SPI_stack;
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new_SPI_stack = (_SPI_connection *) realloc(_SPI_stack,
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(_SPI_connected + 1) * sizeof(_SPI_connection));
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/* This could only fail with a pretty stupid malloc package ... */
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if (new_SPI_stack == NULL)
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elog(ERROR, "Memory exhausted in SPI_finish");
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_SPI_stack = new_SPI_stack;
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_SPI_current = &(_SPI_stack[_SPI_connected]);
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}
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return SPI_OK_FINISH;
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}
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/*
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* Clean up SPI state at transaction commit or abort (we don't care which).
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*/
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void
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AtEOXact_SPI(void)
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{
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/*
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* Note that memory contexts belonging to SPI stack entries will be
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* freed automatically, so we can ignore them here. We just need to
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* restore our static variables to initial state.
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*/
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if (_SPI_stack != NULL) /* there was abort */
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free(_SPI_stack);
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_SPI_current = _SPI_stack = NULL;
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_SPI_connected = _SPI_curid = -1;
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SPI_processed = 0;
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SPI_lastoid = InvalidOid;
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SPI_tuptable = NULL;
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}
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void
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SPI_push(void)
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{
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_SPI_curid++;
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}
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void
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SPI_pop(void)
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{
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_SPI_curid--;
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}
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int
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SPI_exec(char *src, int tcount)
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{
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int res;
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if (src == NULL || tcount < 0)
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return SPI_ERROR_ARGUMENT;
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res = _SPI_begin_call(true);
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if (res < 0)
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return res;
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res = _SPI_execute(src, tcount, NULL);
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_SPI_end_call(true);
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return res;
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}
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int
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SPI_execp(void *plan, Datum *Values, char *Nulls, int tcount)
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{
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int res;
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if (plan == NULL || tcount < 0)
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return SPI_ERROR_ARGUMENT;
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if (((_SPI_plan *) plan)->nargs > 0 && Values == NULL)
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return SPI_ERROR_PARAM;
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res = _SPI_begin_call(true);
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if (res < 0)
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return res;
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/* copy plan to current (executor) context */
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plan = (void *) _SPI_copy_plan(plan, _SPI_CPLAN_CURCXT);
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res = _SPI_execute_plan((_SPI_plan *) plan, Values, Nulls, tcount);
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_SPI_end_call(true);
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return res;
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}
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void *
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SPI_prepare(char *src, int nargs, Oid *argtypes)
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{
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_SPI_plan *plan;
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if (src == NULL || nargs < 0 || (nargs > 0 && argtypes == NULL))
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{
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SPI_result = SPI_ERROR_ARGUMENT;
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return NULL;
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}
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SPI_result = _SPI_begin_call(true);
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if (SPI_result < 0)
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return NULL;
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plan = (_SPI_plan *) palloc(sizeof(_SPI_plan)); /* Executor context */
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plan->argtypes = argtypes;
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plan->nargs = nargs;
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SPI_result = _SPI_execute(src, 0, plan);
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if (SPI_result >= 0) /* copy plan to procedure context */
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plan = _SPI_copy_plan(plan, _SPI_CPLAN_PROCXT);
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else
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plan = NULL;
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_SPI_end_call(true);
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return (void *) plan;
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}
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void *
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SPI_saveplan(void *plan)
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{
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_SPI_plan *newplan;
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if (plan == NULL)
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{
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SPI_result = SPI_ERROR_ARGUMENT;
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return NULL;
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}
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SPI_result = _SPI_begin_call(false); /* don't change context */
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if (SPI_result < 0)
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return NULL;
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newplan = _SPI_copy_plan((_SPI_plan *) plan, _SPI_CPLAN_TOPCXT);
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_SPI_curid--;
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SPI_result = 0;
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return (void *) newplan;
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}
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int
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SPI_freeplan(void *plan)
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{
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_SPI_plan *spiplan = (_SPI_plan *) plan;
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if (plan == NULL)
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return SPI_ERROR_ARGUMENT;
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MemoryContextDelete(spiplan->plancxt);
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return 0;
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}
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HeapTuple
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SPI_copytuple(HeapTuple tuple)
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{
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MemoryContext oldcxt = NULL;
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HeapTuple ctuple;
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if (tuple == NULL)
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{
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SPI_result = SPI_ERROR_ARGUMENT;
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return NULL;
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}
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if (_SPI_curid + 1 == _SPI_connected) /* connected */
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{
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if (_SPI_current != &(_SPI_stack[_SPI_curid + 1]))
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elog(FATAL, "SPI: stack corrupted");
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oldcxt = MemoryContextSwitchTo(_SPI_current->savedcxt);
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}
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ctuple = heap_copytuple(tuple);
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if (oldcxt)
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MemoryContextSwitchTo(oldcxt);
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return ctuple;
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}
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TupleDesc
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SPI_copytupledesc(TupleDesc tupdesc)
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{
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MemoryContext oldcxt = NULL;
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TupleDesc ctupdesc;
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if (tupdesc == NULL)
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{
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SPI_result = SPI_ERROR_ARGUMENT;
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return NULL;
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}
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if (_SPI_curid + 1 == _SPI_connected) /* connected */
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{
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if (_SPI_current != &(_SPI_stack[_SPI_curid + 1]))
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elog(FATAL, "SPI: stack corrupted");
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oldcxt = MemoryContextSwitchTo(_SPI_current->savedcxt);
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}
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ctupdesc = CreateTupleDescCopy(tupdesc);
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if (oldcxt)
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MemoryContextSwitchTo(oldcxt);
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return ctupdesc;
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}
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TupleTableSlot *
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SPI_copytupleintoslot(HeapTuple tuple, TupleDesc tupdesc)
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{
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MemoryContext oldcxt = NULL;
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TupleTableSlot *cslot;
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HeapTuple ctuple;
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TupleDesc ctupdesc;
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if (tuple == NULL || tupdesc == NULL)
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{
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SPI_result = SPI_ERROR_ARGUMENT;
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return NULL;
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}
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if (_SPI_curid + 1 == _SPI_connected) /* connected */
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{
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if (_SPI_current != &(_SPI_stack[_SPI_curid + 1]))
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elog(FATAL, "SPI: stack corrupted");
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oldcxt = MemoryContextSwitchTo(_SPI_current->savedcxt);
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}
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ctuple = heap_copytuple(tuple);
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ctupdesc = CreateTupleDescCopy(tupdesc);
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cslot = MakeTupleTableSlot();
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ExecSetSlotDescriptor(cslot, ctupdesc, true);
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cslot = ExecStoreTuple(ctuple, cslot, InvalidBuffer, true);
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if (oldcxt)
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MemoryContextSwitchTo(oldcxt);
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return cslot;
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}
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HeapTuple
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SPI_modifytuple(Relation rel, HeapTuple tuple, int natts, int *attnum,
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Datum *Values, char *Nulls)
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{
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MemoryContext oldcxt = NULL;
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HeapTuple mtuple;
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int numberOfAttributes;
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uint8 infomask;
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Datum *v;
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char *n;
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bool isnull;
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int i;
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if (rel == NULL || tuple == NULL || natts <= 0 || attnum == NULL || Values == NULL)
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{
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SPI_result = SPI_ERROR_ARGUMENT;
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return NULL;
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}
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if (_SPI_curid + 1 == _SPI_connected) /* connected */
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{
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if (_SPI_current != &(_SPI_stack[_SPI_curid + 1]))
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elog(FATAL, "SPI: stack corrupted");
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oldcxt = MemoryContextSwitchTo(_SPI_current->savedcxt);
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}
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SPI_result = 0;
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numberOfAttributes = rel->rd_att->natts;
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v = (Datum *) palloc(numberOfAttributes * sizeof(Datum));
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n = (char *) palloc(numberOfAttributes * sizeof(char));
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/* fetch old values and nulls */
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for (i = 0; i < numberOfAttributes; i++)
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{
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v[i] = heap_getattr(tuple, i + 1, rel->rd_att, &isnull);
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n[i] = (isnull) ? 'n' : ' ';
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}
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/* replace values and nulls */
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for (i = 0; i < natts; i++)
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{
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if (attnum[i] <= 0 || attnum[i] > numberOfAttributes)
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break;
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v[attnum[i] - 1] = Values[i];
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n[attnum[i] - 1] = (Nulls && Nulls[i] == 'n') ? 'n' : ' ';
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}
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if (i == natts) /* no errors in *attnum */
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{
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mtuple = heap_formtuple(rel->rd_att, v, n);
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infomask = mtuple->t_data->t_infomask;
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memmove(&(mtuple->t_data->t_oid), &(tuple->t_data->t_oid),
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((char *) &(tuple->t_data->t_hoff) -
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(char *) &(tuple->t_data->t_oid)));
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mtuple->t_data->t_infomask = infomask;
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mtuple->t_data->t_natts = numberOfAttributes;
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}
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else
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{
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mtuple = NULL;
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SPI_result = SPI_ERROR_NOATTRIBUTE;
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}
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pfree(v);
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pfree(n);
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if (oldcxt)
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MemoryContextSwitchTo(oldcxt);
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return mtuple;
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}
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int
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SPI_fnumber(TupleDesc tupdesc, char *fname)
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{
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int res;
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Form_pg_attribute sysatt;
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for (res = 0; res < tupdesc->natts; res++)
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{
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if (namestrcmp(&tupdesc->attrs[res]->attname, fname) == 0)
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return res + 1;
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}
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sysatt = SystemAttributeByName(fname, true /* "oid" will be accepted */ );
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if (sysatt != NULL)
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return sysatt->attnum;
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/* SPI_ERROR_NOATTRIBUTE is different from all sys column numbers */
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return SPI_ERROR_NOATTRIBUTE;
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}
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char *
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SPI_fname(TupleDesc tupdesc, int fnumber)
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{
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Form_pg_attribute att;
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SPI_result = 0;
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if (fnumber > tupdesc->natts || fnumber == 0 ||
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fnumber <= FirstLowInvalidHeapAttributeNumber)
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{
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SPI_result = SPI_ERROR_NOATTRIBUTE;
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return NULL;
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}
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if (fnumber > 0)
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att = tupdesc->attrs[fnumber - 1];
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else
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att = SystemAttributeDefinition(fnumber, true);
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return pstrdup(NameStr(att->attname));
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}
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char *
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SPI_getvalue(HeapTuple tuple, TupleDesc tupdesc, int fnumber)
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{
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Datum origval,
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val,
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result;
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bool isnull;
|
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Oid typoid,
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foutoid,
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typelem;
|
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int32 typmod;
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bool typisvarlena;
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SPI_result = 0;
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if (fnumber > tuple->t_data->t_natts || fnumber == 0 ||
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fnumber <= FirstLowInvalidHeapAttributeNumber)
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{
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SPI_result = SPI_ERROR_NOATTRIBUTE;
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return NULL;
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}
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origval = heap_getattr(tuple, fnumber, tupdesc, &isnull);
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if (isnull)
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return NULL;
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if (fnumber > 0)
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{
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typoid = tupdesc->attrs[fnumber - 1]->atttypid;
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typmod = tupdesc->attrs[fnumber - 1]->atttypmod;
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}
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else
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{
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typoid = (SystemAttributeDefinition(fnumber, true))->atttypid;
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typmod = -1;
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}
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|
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if (!getTypeOutputInfo(typoid, &foutoid, &typelem, &typisvarlena))
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{
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SPI_result = SPI_ERROR_NOOUTFUNC;
|
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return NULL;
|
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}
|
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|
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/*
|
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* If we have a toasted datum, forcibly detoast it here to avoid
|
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* memory leakage inside the type's output routine.
|
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*/
|
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if (typisvarlena)
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val = PointerGetDatum(PG_DETOAST_DATUM(origval));
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else
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val = origval;
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|
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result = OidFunctionCall3(foutoid,
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val,
|
|
ObjectIdGetDatum(typelem),
|
|
Int32GetDatum(typmod));
|
|
|
|
/* Clean up detoasted copy, if any */
|
|
if (val != origval)
|
|
pfree(DatumGetPointer(val));
|
|
|
|
return DatumGetCString(result);
|
|
}
|
|
|
|
Datum
|
|
SPI_getbinval(HeapTuple tuple, TupleDesc tupdesc, int fnumber, bool *isnull)
|
|
{
|
|
SPI_result = 0;
|
|
|
|
if (fnumber > tuple->t_data->t_natts || fnumber == 0 ||
|
|
fnumber <= FirstLowInvalidHeapAttributeNumber)
|
|
{
|
|
SPI_result = SPI_ERROR_NOATTRIBUTE;
|
|
*isnull = true;
|
|
return (Datum) NULL;
|
|
}
|
|
|
|
return heap_getattr(tuple, fnumber, tupdesc, isnull);
|
|
}
|
|
|
|
char *
|
|
SPI_gettype(TupleDesc tupdesc, int fnumber)
|
|
{
|
|
Oid typoid;
|
|
HeapTuple typeTuple;
|
|
char *result;
|
|
|
|
SPI_result = 0;
|
|
|
|
if (fnumber > tupdesc->natts || fnumber == 0 ||
|
|
fnumber <= FirstLowInvalidHeapAttributeNumber)
|
|
{
|
|
SPI_result = SPI_ERROR_NOATTRIBUTE;
|
|
return NULL;
|
|
}
|
|
|
|
if (fnumber > 0)
|
|
typoid = tupdesc->attrs[fnumber - 1]->atttypid;
|
|
else
|
|
typoid = (SystemAttributeDefinition(fnumber, true))->atttypid;
|
|
|
|
typeTuple = SearchSysCache(TYPEOID,
|
|
ObjectIdGetDatum(typoid),
|
|
0, 0, 0);
|
|
|
|
if (!HeapTupleIsValid(typeTuple))
|
|
{
|
|
SPI_result = SPI_ERROR_TYPUNKNOWN;
|
|
return NULL;
|
|
}
|
|
|
|
result = pstrdup(NameStr(((Form_pg_type) GETSTRUCT(typeTuple))->typname));
|
|
ReleaseSysCache(typeTuple);
|
|
return result;
|
|
}
|
|
|
|
Oid
|
|
SPI_gettypeid(TupleDesc tupdesc, int fnumber)
|
|
{
|
|
SPI_result = 0;
|
|
|
|
if (fnumber > tupdesc->natts || fnumber == 0 ||
|
|
fnumber <= FirstLowInvalidHeapAttributeNumber)
|
|
{
|
|
SPI_result = SPI_ERROR_NOATTRIBUTE;
|
|
return InvalidOid;
|
|
}
|
|
|
|
if (fnumber > 0)
|
|
return tupdesc->attrs[fnumber - 1]->atttypid;
|
|
else
|
|
return (SystemAttributeDefinition(fnumber, true))->atttypid;
|
|
}
|
|
|
|
char *
|
|
SPI_getrelname(Relation rel)
|
|
{
|
|
return pstrdup(RelationGetRelationName(rel));
|
|
}
|
|
|
|
void *
|
|
SPI_palloc(Size size)
|
|
{
|
|
MemoryContext oldcxt = NULL;
|
|
void *pointer;
|
|
|
|
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);
|
|
}
|
|
|
|
pointer = palloc(size);
|
|
|
|
if (oldcxt)
|
|
MemoryContextSwitchTo(oldcxt);
|
|
|
|
return pointer;
|
|
}
|
|
|
|
void *
|
|
SPI_repalloc(void *pointer, Size size)
|
|
{
|
|
/* No longer need to worry which context chunk was in... */
|
|
return repalloc(pointer, size);
|
|
}
|
|
|
|
void
|
|
SPI_pfree(void *pointer)
|
|
{
|
|
/* No longer need to worry which context chunk was in... */
|
|
pfree(pointer);
|
|
}
|
|
|
|
void
|
|
SPI_freetuple(HeapTuple tuple)
|
|
{
|
|
/* No longer need to worry which context tuple was in... */
|
|
heap_freetuple(tuple);
|
|
}
|
|
|
|
void
|
|
SPI_freetuptable(SPITupleTable *tuptable)
|
|
{
|
|
if (tuptable != NULL)
|
|
MemoryContextDelete(tuptable->tuptabcxt);
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* SPI_cursor_open()
|
|
*
|
|
* Open a prepared SPI plan as a portal
|
|
*/
|
|
Portal
|
|
SPI_cursor_open(char *name, void *plan, Datum *Values, char *Nulls)
|
|
{
|
|
static int unnamed_portal_count = 0;
|
|
|
|
_SPI_plan *spiplan = (_SPI_plan *) plan;
|
|
List *qtlist = spiplan->qtlist;
|
|
List *ptlist = spiplan->ptlist;
|
|
Query *queryTree;
|
|
Plan *planTree;
|
|
QueryDesc *queryDesc;
|
|
EState *eState;
|
|
TupleDesc attinfo;
|
|
MemoryContext oldcontext;
|
|
Portal portal;
|
|
char portalname[64];
|
|
int k;
|
|
|
|
/* Ensure that the plan contains only one regular SELECT query */
|
|
if (length(ptlist) != 1)
|
|
elog(ERROR, "cannot open multi-query plan as cursor");
|
|
queryTree = (Query *) 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");
|
|
|
|
/* Increment CommandCounter to see changes made by now */
|
|
CommandCounterIncrement();
|
|
|
|
/* Reset SPI result */
|
|
SPI_processed = 0;
|
|
SPI_tuptable = NULL;
|
|
_SPI_current->processed = 0;
|
|
_SPI_current->tuptable = NULL;
|
|
|
|
if (name == NULL)
|
|
{
|
|
/* 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;
|
|
}
|
|
else
|
|
{
|
|
/* Ensure the portal doesn't exist already */
|
|
portal = GetPortalByName(name);
|
|
if (portal != NULL)
|
|
elog(ERROR, "cursor \"%s\" already in use", name);
|
|
}
|
|
|
|
/* 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 = pstrdup(name);
|
|
queryTree->isBinary = false;
|
|
|
|
/* Create the QueryDesc object and the executor state */
|
|
queryDesc = CreateQueryDesc(queryTree, planTree, SPI, NULL);
|
|
eState = CreateExecutorState();
|
|
|
|
/* If the plan has parameters, put them into the executor state */
|
|
if (spiplan->nargs > 0)
|
|
{
|
|
ParamListInfo paramLI;
|
|
|
|
paramLI = (ParamListInfo) palloc((spiplan->nargs + 1) *
|
|
sizeof(ParamListInfoData));
|
|
MemSet(paramLI, 0, (spiplan->nargs + 1) * sizeof(ParamListInfoData));
|
|
|
|
eState->es_param_list_info = paramLI;
|
|
for (k = 0; k < spiplan->nargs; paramLI++, k++)
|
|
{
|
|
paramLI->kind = PARAM_NUM;
|
|
paramLI->id = k + 1;
|
|
paramLI->isnull = (Nulls && Nulls[k] == 'n');
|
|
if (paramLI->isnull)
|
|
{
|
|
/* nulls just copy */
|
|
paramLI->value = Values[k];
|
|
}
|
|
else
|
|
{
|
|
/* pass-by-ref values must be copied into portal context */
|
|
int16 paramTypLen;
|
|
bool paramTypByVal;
|
|
|
|
get_typlenbyval(spiplan->argtypes[k],
|
|
¶mTypLen, ¶mTypByVal);
|
|
paramLI->value = datumCopy(Values[k],
|
|
paramTypByVal, paramTypLen);
|
|
}
|
|
}
|
|
paramLI->kind = PARAM_INVALID;
|
|
}
|
|
else
|
|
eState->es_param_list_info = NULL;
|
|
|
|
/* Start the executor */
|
|
attinfo = ExecutorStart(queryDesc, eState);
|
|
|
|
/* Put all the objects into the portal */
|
|
PortalSetQuery(portal, queryDesc, attinfo, eState, PortalCleanup);
|
|
|
|
/* Switch back to the callers memory context */
|
|
MemoryContextSwitchTo(oldcontext);
|
|
|
|
/* Return the created portal */
|
|
return portal;
|
|
}
|
|
|
|
|
|
/*
|
|
* SPI_cursor_find()
|
|
*
|
|
* Find the portal of an existing open cursor
|
|
*/
|
|
Portal
|
|
SPI_cursor_find(char *name)
|
|
{
|
|
return GetPortalByName(name);
|
|
}
|
|
|
|
|
|
/*
|
|
* SPI_cursor_fetch()
|
|
*
|
|
* Fetch rows in a cursor
|
|
*/
|
|
void
|
|
SPI_cursor_fetch(Portal portal, bool forward, int count)
|
|
{
|
|
_SPI_cursor_operation(portal, forward, count, SPI);
|
|
}
|
|
|
|
|
|
/*
|
|
* SPI_cursor_move()
|
|
*
|
|
* Move in a cursor
|
|
*/
|
|
void
|
|
SPI_cursor_move(Portal portal, bool forward, int count)
|
|
{
|
|
_SPI_cursor_operation(portal, forward, count, None);
|
|
}
|
|
|
|
|
|
/*
|
|
* SPI_cursor_close()
|
|
*
|
|
* Close a cursor
|
|
*/
|
|
void
|
|
SPI_cursor_close(Portal portal)
|
|
{
|
|
if (!PortalIsValid(portal))
|
|
elog(ERROR, "invalid portal in SPI cursor operation");
|
|
|
|
PortalDrop(portal);
|
|
}
|
|
|
|
/* =================== private functions =================== */
|
|
|
|
/*
|
|
* spi_printtup
|
|
* store tuple retrieved by Executor into SPITupleTable
|
|
* of current SPI procedure
|
|
*
|
|
*/
|
|
void
|
|
spi_printtup(HeapTuple tuple, TupleDesc tupdesc, DestReceiver *self)
|
|
{
|
|
SPITupleTable *tuptable;
|
|
MemoryContext oldcxt;
|
|
MemoryContext tuptabcxt;
|
|
|
|
/*
|
|
* When called by Executor _SPI_curid expected to be equal to
|
|
* _SPI_connected
|
|
*/
|
|
if (_SPI_curid != _SPI_connected || _SPI_connected < 0)
|
|
elog(FATAL, "SPI: improper call to spi_printtup");
|
|
if (_SPI_current != &(_SPI_stack[_SPI_curid]))
|
|
elog(FATAL, "SPI: stack corrupted in spi_printtup");
|
|
|
|
oldcxt = _SPI_procmem(); /* switch to procedure memory context */
|
|
|
|
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);
|
|
|
|
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->free)--;
|
|
|
|
MemoryContextSwitchTo(oldcxt);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Static functions
|
|
*/
|
|
|
|
static int
|
|
_SPI_execute(char *src, int tcount, _SPI_plan *plan)
|
|
{
|
|
List *queryTree_list;
|
|
List *planTree_list;
|
|
List *queryTree_list_item;
|
|
QueryDesc *qdesc;
|
|
Query *queryTree;
|
|
Plan *planTree;
|
|
EState *state;
|
|
int nargs = 0;
|
|
Oid *argtypes = NULL;
|
|
int res = 0;
|
|
bool islastquery;
|
|
|
|
/* Increment CommandCounter to see changes made by now */
|
|
CommandCounterIncrement();
|
|
|
|
SPI_processed = 0;
|
|
SPI_lastoid = InvalidOid;
|
|
SPI_tuptable = NULL;
|
|
_SPI_current->tuptable = NULL;
|
|
_SPI_current->qtlist = NULL;
|
|
|
|
if (plan)
|
|
{
|
|
nargs = plan->nargs;
|
|
argtypes = plan->argtypes;
|
|
}
|
|
|
|
queryTree_list = pg_parse_and_rewrite(src, argtypes, nargs);
|
|
|
|
_SPI_current->qtlist = queryTree_list;
|
|
|
|
planTree_list = NIL;
|
|
|
|
foreach(queryTree_list_item, queryTree_list)
|
|
{
|
|
queryTree = (Query *) lfirst(queryTree_list_item);
|
|
islastquery = (lnext(queryTree_list_item) == NIL);
|
|
|
|
planTree = pg_plan_query(queryTree);
|
|
planTree_list = lappend(planTree_list, planTree);
|
|
|
|
if (queryTree->commandType == CMD_UTILITY)
|
|
{
|
|
if (nodeTag(queryTree->utilityStmt) == T_CopyStmt)
|
|
{
|
|
CopyStmt *stmt = (CopyStmt *) (queryTree->utilityStmt);
|
|
|
|
if (stmt->filename == NULL)
|
|
return SPI_ERROR_COPY;
|
|
}
|
|
else if (nodeTag(queryTree->utilityStmt) == T_ClosePortalStmt ||
|
|
nodeTag(queryTree->utilityStmt) == T_FetchStmt)
|
|
return SPI_ERROR_CURSOR;
|
|
else if (nodeTag(queryTree->utilityStmt) == T_TransactionStmt)
|
|
return SPI_ERROR_TRANSACTION;
|
|
res = SPI_OK_UTILITY;
|
|
if (plan == NULL)
|
|
{
|
|
ProcessUtility(queryTree->utilityStmt, None, NULL);
|
|
if (!islastquery)
|
|
CommandCounterIncrement();
|
|
else
|
|
return res;
|
|
}
|
|
else if (islastquery)
|
|
break;
|
|
}
|
|
else if (plan == NULL)
|
|
{
|
|
qdesc = CreateQueryDesc(queryTree, planTree,
|
|
islastquery ? SPI : None, NULL);
|
|
state = CreateExecutorState();
|
|
res = _SPI_pquery(qdesc, state, islastquery ? tcount : 0);
|
|
if (res < 0 || islastquery)
|
|
return res;
|
|
CommandCounterIncrement();
|
|
}
|
|
else
|
|
{
|
|
qdesc = CreateQueryDesc(queryTree, planTree,
|
|
islastquery ? SPI : None, NULL);
|
|
res = _SPI_pquery(qdesc, NULL, islastquery ? tcount : 0);
|
|
if (res < 0)
|
|
return res;
|
|
if (islastquery)
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (plan)
|
|
{
|
|
plan->qtlist = queryTree_list;
|
|
plan->ptlist = planTree_list;
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
static int
|
|
_SPI_execute_plan(_SPI_plan *plan, Datum *Values, char *Nulls, int tcount)
|
|
{
|
|
List *queryTree_list = plan->qtlist;
|
|
List *planTree_list = plan->ptlist;
|
|
List *queryTree_list_item;
|
|
QueryDesc *qdesc;
|
|
Query *queryTree;
|
|
Plan *planTree;
|
|
EState *state;
|
|
int nargs = plan->nargs;
|
|
int res = 0;
|
|
bool islastquery;
|
|
int k;
|
|
|
|
/* Increment CommandCounter to see changes made by now */
|
|
CommandCounterIncrement();
|
|
|
|
SPI_processed = 0;
|
|
SPI_lastoid = InvalidOid;
|
|
SPI_tuptable = NULL;
|
|
_SPI_current->tuptable = NULL;
|
|
_SPI_current->qtlist = NULL;
|
|
|
|
foreach(queryTree_list_item, queryTree_list)
|
|
{
|
|
queryTree = (Query *) lfirst(queryTree_list_item);
|
|
planTree = lfirst(planTree_list);
|
|
planTree_list = lnext(planTree_list);
|
|
islastquery = (planTree_list == NIL); /* assume lists are same
|
|
* len */
|
|
|
|
if (queryTree->commandType == CMD_UTILITY)
|
|
{
|
|
ProcessUtility(queryTree->utilityStmt, None, NULL);
|
|
if (!islastquery)
|
|
CommandCounterIncrement();
|
|
else
|
|
return SPI_OK_UTILITY;
|
|
}
|
|
else
|
|
{
|
|
qdesc = CreateQueryDesc(queryTree, planTree,
|
|
islastquery ? SPI : None, NULL);
|
|
state = CreateExecutorState();
|
|
if (nargs > 0)
|
|
{
|
|
ParamListInfo paramLI;
|
|
|
|
paramLI = (ParamListInfo) palloc((nargs + 1) *
|
|
sizeof(ParamListInfoData));
|
|
MemSet(paramLI, 0, (nargs + 1) * sizeof(ParamListInfoData));
|
|
|
|
state->es_param_list_info = paramLI;
|
|
for (k = 0; k < plan->nargs; paramLI++, k++)
|
|
{
|
|
paramLI->kind = PARAM_NUM;
|
|
paramLI->id = k + 1;
|
|
paramLI->isnull = (Nulls && Nulls[k] == 'n');
|
|
paramLI->value = Values[k];
|
|
}
|
|
paramLI->kind = PARAM_INVALID;
|
|
}
|
|
else
|
|
state->es_param_list_info = NULL;
|
|
res = _SPI_pquery(qdesc, state, islastquery ? tcount : 0);
|
|
if (res < 0 || islastquery)
|
|
return res;
|
|
CommandCounterIncrement();
|
|
}
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
static int
|
|
_SPI_pquery(QueryDesc *queryDesc, EState *state, int 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)
|
|
{
|
|
isRetrieveIntoPortal = true;
|
|
intoName = parseTree->into;
|
|
parseTree->isBinary = false; /* */
|
|
|
|
return SPI_ERROR_CURSOR;
|
|
|
|
}
|
|
else if (parseTree->into != NULL) /* select into table */
|
|
{
|
|
res = SPI_OK_SELINTO;
|
|
isRetrieveIntoRelation = true;
|
|
queryDesc->dest = None; /* */
|
|
}
|
|
break;
|
|
case CMD_INSERT:
|
|
res = SPI_OK_INSERT;
|
|
break;
|
|
case CMD_DELETE:
|
|
res = SPI_OK_DELETE;
|
|
break;
|
|
case CMD_UPDATE:
|
|
res = SPI_OK_UPDATE;
|
|
break;
|
|
default:
|
|
return SPI_ERROR_OPUNKNOWN;
|
|
}
|
|
|
|
if (state == NULL) /* plan preparation */
|
|
return res;
|
|
|
|
#ifdef SPI_EXECUTOR_STATS
|
|
if (ShowExecutorStats)
|
|
ResetUsage();
|
|
#endif
|
|
|
|
ExecutorStart(queryDesc, state);
|
|
|
|
/*
|
|
* Don't work currently --- need to rearrange callers so that we
|
|
* prepare the portal before doing CreateExecutorState() etc. See
|
|
* pquery.c for the correct order of operations.
|
|
*/
|
|
if (isRetrieveIntoPortal)
|
|
elog(FATAL, "SPI_select: retrieve into portal not implemented");
|
|
|
|
ExecutorRun(queryDesc, state, ForwardScanDirection, (long) tcount);
|
|
|
|
_SPI_current->processed = state->es_processed;
|
|
save_lastoid = state->es_lastoid;
|
|
|
|
if (operation == CMD_SELECT && queryDesc->dest == SPI)
|
|
{
|
|
if (_SPI_checktuples())
|
|
elog(FATAL, "SPI_select: # of processed tuples check failed");
|
|
}
|
|
|
|
ExecutorEnd(queryDesc, state);
|
|
|
|
#ifdef SPI_EXECUTOR_STATS
|
|
if (ShowExecutorStats)
|
|
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_cursor_operation()
|
|
*
|
|
* Do a FETCH or MOVE in a cursor
|
|
*/
|
|
static void
|
|
_SPI_cursor_operation(Portal portal, bool forward, int count,
|
|
CommandDest dest)
|
|
{
|
|
QueryDesc *querydesc;
|
|
EState *estate;
|
|
MemoryContext oldcontext;
|
|
ScanDirection direction;
|
|
CommandId savedId;
|
|
CommandDest olddest;
|
|
|
|
/* 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);
|
|
|
|
/* Reset the SPI result */
|
|
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 = PortalGetState(portal);
|
|
|
|
/* Save the queries command destination and set it to SPI (for fetch) */
|
|
/* or None (for move) */
|
|
olddest = querydesc->dest;
|
|
querydesc->dest = dest;
|
|
|
|
/*
|
|
* Restore the scanCommandId that was current when the cursor was
|
|
* opened. This ensures that we see the same tuples throughout the
|
|
* execution of the cursor.
|
|
*/
|
|
savedId = GetScanCommandId();
|
|
SetScanCommandId(PortalGetCommandId(portal));
|
|
|
|
/* Run the executor like PerformPortalFetch and remember states */
|
|
if (forward)
|
|
{
|
|
if (portal->atEnd)
|
|
direction = NoMovementScanDirection;
|
|
else
|
|
direction = ForwardScanDirection;
|
|
|
|
ExecutorRun(querydesc, estate, 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, estate, 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 outer command ID.
|
|
*/
|
|
SetScanCommandId(savedId);
|
|
|
|
/* Restore the old command destination and switch back to callers */
|
|
/* memory context */
|
|
querydesc->dest = olddest;
|
|
MemoryContextSwitchTo(oldcontext);
|
|
|
|
if (dest == SPI && _SPI_checktuples())
|
|
elog(FATAL, "SPI_fetch: # of processed tuples check failed");
|
|
|
|
/* Put the result into place for access by caller */
|
|
SPI_processed = _SPI_current->processed;
|
|
SPI_tuptable = _SPI_current->tuptable;
|
|
|
|
/* Pop the SPI stack */
|
|
_SPI_end_call(true);
|
|
}
|
|
|
|
|
|
static MemoryContext
|
|
_SPI_execmem()
|
|
{
|
|
return MemoryContextSwitchTo(_SPI_current->execCxt);
|
|
}
|
|
|
|
static MemoryContext
|
|
_SPI_procmem()
|
|
{
|
|
return MemoryContextSwitchTo(_SPI_current->procCxt);
|
|
}
|
|
|
|
/*
|
|
* _SPI_begin_call
|
|
*
|
|
*/
|
|
static int
|
|
_SPI_begin_call(bool execmem)
|
|
{
|
|
if (_SPI_curid + 1 != _SPI_connected)
|
|
return SPI_ERROR_UNCONNECTED;
|
|
_SPI_curid++;
|
|
if (_SPI_current != &(_SPI_stack[_SPI_curid]))
|
|
elog(FATAL, "SPI: stack corrupted");
|
|
|
|
if (execmem) /* switch to the Executor memory context */
|
|
_SPI_execmem();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
_SPI_end_call(bool procmem)
|
|
{
|
|
/*
|
|
* We' returning to procedure where _SPI_curid == _SPI_connected - 1
|
|
*/
|
|
_SPI_curid--;
|
|
|
|
_SPI_current->qtlist = NULL;
|
|
|
|
if (procmem) /* switch to the procedure memory context */
|
|
{
|
|
_SPI_procmem();
|
|
/* and free Executor memory */
|
|
MemoryContextResetAndDeleteChildren(_SPI_current->execCxt);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static bool
|
|
_SPI_checktuples(void)
|
|
{
|
|
uint32 processed = _SPI_current->processed;
|
|
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;
|
|
}
|
|
|
|
return failed;
|
|
}
|
|
|
|
static _SPI_plan *
|
|
_SPI_copy_plan(_SPI_plan *plan, int location)
|
|
{
|
|
_SPI_plan *newplan;
|
|
MemoryContext oldcxt;
|
|
MemoryContext plancxt;
|
|
MemoryContext parentcxt;
|
|
|
|
/* Determine correct parent for the plan's memory context */
|
|
if (location == _SPI_CPLAN_PROCXT)
|
|
parentcxt = _SPI_current->procCxt;
|
|
else if (location == _SPI_CPLAN_TOPCXT)
|
|
parentcxt = TopMemoryContext;
|
|
else
|
|
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.
|
|
*/
|
|
plancxt = AllocSetContextCreate(parentcxt,
|
|
"SPI Plan",
|
|
1024,
|
|
1024,
|
|
ALLOCSET_DEFAULT_MAXSIZE);
|
|
oldcxt = MemoryContextSwitchTo(plancxt);
|
|
|
|
/* Copy the SPI plan into its own context */
|
|
newplan = (_SPI_plan *) palloc(sizeof(_SPI_plan));
|
|
newplan->plancxt = plancxt;
|
|
newplan->qtlist = (List *) copyObject(plan->qtlist);
|
|
newplan->ptlist = (List *) copyObject(plan->ptlist);
|
|
newplan->nargs = plan->nargs;
|
|
if (plan->nargs > 0)
|
|
{
|
|
newplan->argtypes = (Oid *) palloc(plan->nargs * sizeof(Oid));
|
|
memcpy(newplan->argtypes, plan->argtypes, plan->nargs * sizeof(Oid));
|
|
}
|
|
else
|
|
newplan->argtypes = NULL;
|
|
|
|
MemoryContextSwitchTo(oldcxt);
|
|
|
|
return newplan;
|
|
}
|