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postgres/src/include/executor/spi.h

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SPI manager.
1997-08-29 09:05:57 +00:00
/*-------------------------------------------------------------------------
*
Change my-function-name-- to my_function_name, and optimizer renames.
1999-02-13 23:22:53 +00:00
* spi.h
Massive commit to run PGINDENT on all *.c and *.h files.
1997-09-07 05:04:48 +00:00
*
Restructure subtransaction handling to reduce resource consumption, as per recent discussions. Invent SubTransactionIds that are managed like CommandIds (ie, counter is reset at start of each top transaction), and use these instead of TransactionIds to keep track of subtransaction status in those modules that need it. This means that a subtransaction does not need an XID unless it actually inserts/modifies rows in the database. Accordingly, don't assign it an XID nor take a lock on the XID until it tries to do that. This saves a lot of overhead for subtransactions that are only used for error recovery (eg plpgsql exceptions). Also, arrange to release a subtransaction's XID lock as soon as the subtransaction exits, in both the commit and abort cases. This avoids holding many unique locks after a long series of subtransactions. The price is some additional overhead in XactLockTableWait, but that seems acceptable. Finally, restructure the state machine in xact.c to have a more orthogonal set of states for subtransactions.
2004-09-16 16:58:44 +00:00
* $PostgreSQL: pgsql/src/include/executor/spi.h,v 1.49 2004/09/16 16:58:40 tgl Exp $
SPI manager.
1997-08-29 09:05:57 +00:00
*
*-------------------------------------------------------------------------
*/
Massive commit to run PGINDENT on all *.c and *.h files.
1997-09-07 05:04:48 +00:00
#ifndef SPI_H
SPI manager.
1997-08-29 09:05:57 +00:00
#define SPI_H
Restructure the key include files per recent pghackers discussion: there are now separate files "postgres.h" and "postgres_fe.h", which are meant to be the primary include files for backend .c files and frontend .c files respectively. By default, only include files meant for frontend use are installed into the installation include directory. There is a new make target 'make install-all-headers' that adds the whole content of the src/include tree to the installed fileset, for use by people who want to develop server-side code without keeping the complete source tree on hand. Cleaned up a whole lot of crufty and inconsistent header inclusions.
2001-02-10 02:31:31 +00:00
/*
* This file may be used by client modules that haven't already
* included postgres.h
*/
SPI manager.
1997-08-29 09:05:57 +00:00
#include "postgres.h"
Clean up #include in /include directory. Add scripts for checking includes.
1999-07-15 15:21:54 +00:00
/*
* These are not needed by this file, but used by other programs
* using SPI
*/
SPI manager.
1997-08-29 09:05:57 +00:00
#include "nodes/primnodes.h"
#include "nodes/relation.h"
#include "nodes/execnodes.h"
#include "nodes/plannodes.h"
#include "catalog/pg_proc.h"
Add pg_type.h to include list to regain declaration of type OID assignments. Lost these when some include files were reorganized. Regression test could not compile.
1997-11-30 22:42:58 +00:00
#include "catalog/pg_type.h"
SPI manager.
1997-08-29 09:05:57 +00:00
#include "tcop/pquery.h"
#include "tcop/tcopprot.h"
#include "tcop/utility.h"
#include "tcop/dest.h"
#include "nodes/params.h"
Restructure parsetree representation of DECLARE CURSOR: now it's a utility statement (DeclareCursorStmt) with a SELECT query dangling from it, rather than a SELECT query with a few unusual fields in it. Add code to determine whether a planned query can safely be run backwards. If DECLARE CURSOR specifies SCROLL, ensure that the plan can be run backwards by adding a Materialize plan node if it can't. Without SCROLL, you get an error if you try to fetch backwards from a cursor that can't handle it. (There is still some discussion about what the exact behavior should be, but this is necessary infrastructure in any case.) Along the way, make EXPLAIN DECLARE CURSOR work.
2003-03-10 03:53:52 +00:00
#include "utils/builtins.h"
SPI manager.
1997-08-29 09:05:57 +00:00
#include "utils/datum.h"
Restructure parsetree representation of DECLARE CURSOR: now it's a utility statement (DeclareCursorStmt) with a SELECT query dangling from it, rather than a SELECT query with a few unusual fields in it. Add code to determine whether a planned query can safely be run backwards. If DECLARE CURSOR specifies SCROLL, ensure that the plan can be run backwards by adding a Materialize plan node if it can't. Without SCROLL, you get an error if you try to fetch backwards from a cursor that can't handle it. (There is still some discussion about what the exact behavior should be, but this is necessary infrastructure in any case.) Along the way, make EXPLAIN DECLARE CURSOR work.
2003-03-10 03:53:52 +00:00
#include "utils/portal.h"
SPI manager.
1997-08-29 09:05:57 +00:00
#include "utils/syscache.h"
#include "catalog/pg_language.h"
#include "access/heapam.h"
#include "access/xact.h"
#include "executor/executor.h"
#include "executor/execdefs.h"
Massive commit to run PGINDENT on all *.c and *.h files.
1997-09-07 05:04:48 +00:00
typedef struct
{
Enhancement of SPI to get access to portals - New functions to create a portal using a prepared/saved SPI plan or lookup an existing portal by name. - Functions to fetch/move from/in portals. Results are placed in the usual SPI_processed and SPI_tuptable, so the entire set of utility functions can be used to gain attribute access. - Prepared/saved SPI plans now use their own memory context and SPI_freeplan(plan) can remove them. - Tuple result sets (SPI_tuptable) now uses it's own memory context and can be free'd by SPI_freetuptable(tuptab). Enhancement of PL/pgSQL - Uses generic named portals internally in FOR ... SELECT loops to avoid running out of memory on huge result sets. - Support for CURSOR and REFCURSOR syntax using the new SPI functionality. Cursors used internally only need no explicit transaction block. Refcursor variables can be used inside of explicit transaction block to pass cursors between main application and functions. Jan
2001-05-21 14:22:19 +00:00
MemoryContext tuptabcxt; /* memory context of result table */
Another PGINDENT run that changes variable indenting and case label indenting. Also static variable indenting.
1997-09-08 02:41:22 +00:00
uint32 alloced; /* # of alloced vals */
uint32 free; /* # of free vals */
TupleDesc tupdesc; /* tuple descriptor */
HeapTuple *vals; /* tuples */
pgindent run before 6.3 release, with Thomas' requested changes.
1998-02-26 04:46:47 +00:00
} SPITupleTable;
SPI manager.
1997-08-29 09:05:57 +00:00
Add a SPI_copytupledesc function that parallels SPI_copytuple --- ie, it copies the tupdesc into upper-executor memory. This is necessary for returning tuple descriptors without leaking all of lower exec memory.
2001-08-02 18:08:43 +00:00
#define SPI_ERROR_CONNECT (-1)
#define SPI_ERROR_COPY (-2)
#define SPI_ERROR_OPUNKNOWN (-3)
#define SPI_ERROR_UNCONNECTED (-4)
#define SPI_ERROR_CURSOR (-5)
#define SPI_ERROR_ARGUMENT (-6)
#define SPI_ERROR_PARAM (-7)
#define SPI_ERROR_TRANSACTION (-8)
#define SPI_ERROR_NOATTRIBUTE (-9)
#define SPI_ERROR_NOOUTFUNC (-10)
#define SPI_ERROR_TYPUNKNOWN (-11)
SPI manager.
1997-08-29 09:05:57 +00:00
Massive commit to run PGINDENT on all *.c and *.h files.
1997-09-07 05:04:48 +00:00
#define SPI_OK_CONNECT 1
#define SPI_OK_FINISH 2
#define SPI_OK_FETCH 3
#define SPI_OK_UTILITY 4
#define SPI_OK_SELECT 5
#define SPI_OK_SELINTO 6
#define SPI_OK_INSERT 7
#define SPI_OK_DELETE 8
#define SPI_OK_UPDATE 9
#define SPI_OK_CURSOR 10
Prototypes, definitions...
1997-09-04 13:26:19 +00:00
Changes to fix/improve the dynamic loading on NT From: Horak Daniel <horak@mmp.plzen-city.cz>
1999-03-09 13:39:15 +00:00
extern DLLIMPORT uint32 SPI_processed;
Change plpgsql's GET DIAGNOSTICS statement to use SQL99-compatible syntax. Fix the RESULT_OID case, which never worked. Add documentation.
2001-02-19 19:49:53 +00:00
extern DLLIMPORT Oid SPI_lastoid;
Changes to fix/improve the dynamic loading on NT From: Horak Daniel <horak@mmp.plzen-city.cz>
1999-03-09 13:39:15 +00:00
extern DLLIMPORT SPITupleTable *SPI_tuptable;
pgindent run over code.
1999-05-25 16:15:34 +00:00
extern DLLIMPORT int SPI_result;
SPI manager.
1997-08-29 09:05:57 +00:00
Another PGINDENT run that changes variable indenting and case label indenting. Also static variable indenting.
1997-09-08 02:41:22 +00:00
extern int SPI_connect(void);
extern int SPI_finish(void);
pgindent run over code.
1999-05-25 16:15:34 +00:00
extern void SPI_push(void);
extern void SPI_pop(void);
Redesign query-snapshot timing so that volatile functions in READ COMMITTED mode see a fresh snapshot for each command in the function, rather than using the latest interactive command's snapshot. Also, suppress fresh snapshots as well as CommandCounterIncrement inside STABLE and IMMUTABLE functions, instead using the snapshot taken for the most closely nested regular query. (This behavior is only sane for read-only functions, so the patch also enforces that such functions contain only SELECT commands.) As per my proposal of 6-Sep-2004; I note that I floated essentially the same proposal on 19-Jun-2002, but that discussion tailed off without any action. Since 8.0 seems like the right place to be taking possibly nontrivial backwards compatibility hits, let's get it done now.
2004-09-13 20:10:13 +00:00
extern int SPI_execute(const char *src, bool read_only, int tcount);
extern int SPI_execute_plan(void *plan, Datum *Values, const char *Nulls,
bool read_only, int tcount);
Pgindent run for 8.0.
2004-08-29 05:07:03 +00:00
extern int SPI_exec(const char *src, int tcount);
Redesign query-snapshot timing so that volatile functions in READ COMMITTED mode see a fresh snapshot for each command in the function, rather than using the latest interactive command's snapshot. Also, suppress fresh snapshots as well as CommandCounterIncrement inside STABLE and IMMUTABLE functions, instead using the snapshot taken for the most closely nested regular query. (This behavior is only sane for read-only functions, so the patch also enforces that such functions contain only SELECT commands.) As per my proposal of 6-Sep-2004; I note that I floated essentially the same proposal on 19-Jun-2002, but that discussion tailed off without any action. Since 8.0 seems like the right place to be taking possibly nontrivial backwards compatibility hits, let's get it done now.
2004-09-13 20:10:13 +00:00
extern int SPI_execp(void *plan, Datum *Values, const char *Nulls,
int tcount);
extern int SPI_execute_snapshot(void *plan,
Datum *Values, const char *Nulls,
Snapshot snapshot,
Snapshot crosscheck_snapshot,
bool read_only, int tcount);
Adjust Tcl-related code to compile cleanly with Tcl 8.4 (add const modifiers as needed). Some desultory const-ification of SPI interface to support this.
2002-12-30 22:10:54 +00:00
extern void *SPI_prepare(const char *src, int nargs, Oid *argtypes);
Another PGINDENT run that changes variable indenting and case label indenting. Also static variable indenting.
1997-09-08 02:41:22 +00:00
extern void *SPI_saveplan(void *plan);
pgindent run on all C files. Java run to follow. initdb/regression tests pass.
2001-10-25 05:50:21 +00:00
extern int SPI_freeplan(void *plan);
Prototypes, definitions...
1997-09-04 13:26:19 +00:00
Pgindent run for 8.0.
2004-08-29 05:07:03 +00:00
extern Oid SPI_getargtypeid(void *plan, int argIndex);
extern int SPI_getargcount(void *plan);
Add new SPI functions for use by PL/Java: +extern Oid SPI_getargtypeid(void *plan, int argIndex); +extern int SPI_getargcount(void *plan); +extern bool SPI_is_cursor_plan(void *plan); Thomas Hallgren
2004-03-05 00:47:01 +00:00
extern bool SPI_is_cursor_plan(void *plan);
Be more consistent about reporting SPI errors in the various PLs. Create a shared function to convert a SPI error code into a string (replacing near-duplicate code in several PLs), and use it anywhere that a SPI function call error is reported.
2004-07-31 20:55:45 +00:00
extern const char *SPI_result_code_string(int code);
Add new SPI functions for use by PL/Java: +extern Oid SPI_getargtypeid(void *plan, int argIndex); +extern int SPI_getargcount(void *plan); +extern bool SPI_is_cursor_plan(void *plan); Thomas Hallgren
2004-03-05 00:47:01 +00:00
Added: SPI_copytuple() & SPI_modifytuple()
1997-09-12 08:37:52 +00:00
extern HeapTuple SPI_copytuple(HeapTuple tuple);
Replace TupleTableSlot convention for whole-row variables and function results with tuples as ordinary varlena Datums. This commit does not in itself do much for us, except eliminate the horrid memory leak associated with evaluation of whole-row variables. However, it lays the groundwork for allowing composite types as table columns, and perhaps some other useful features as well. Per my proposal of a few days ago.
2004-04-01 21:28:47 +00:00
extern HeapTupleHeader SPI_returntuple(HeapTuple tuple, TupleDesc tupdesc);
OK, folks, here is the pgindent output.
1998-09-01 04:40:42 +00:00
extern HeapTuple SPI_modifytuple(Relation rel, HeapTuple tuple, int natts,
Adjust Tcl-related code to compile cleanly with Tcl 8.4 (add const modifiers as needed). Some desultory const-ification of SPI interface to support this.
2002-12-30 22:10:54 +00:00
int *attnum, Datum *Values, const char *Nulls);
extern int SPI_fnumber(TupleDesc tupdesc, const char *fname);
Cleanups.
1997-09-11 07:24:37 +00:00
extern char *SPI_fname(TupleDesc tupdesc, int fnumber);
Another PGINDENT run that changes variable indenting and case label indenting. Also static variable indenting.
1997-09-08 02:41:22 +00:00
extern char *SPI_getvalue(HeapTuple tuple, TupleDesc tupdesc, int fnumber);
pgindent run before 6.3 release, with Thomas' requested changes.
1998-02-26 04:46:47 +00:00
extern Datum SPI_getbinval(HeapTuple tuple, TupleDesc tupdesc, int fnumber, bool *isnull);
Another PGINDENT run that changes variable indenting and case label indenting. Also static variable indenting.
1997-09-08 02:41:22 +00:00
extern char *SPI_gettype(TupleDesc tupdesc, int fnumber);
extern Oid SPI_gettypeid(TupleDesc tupdesc, int fnumber);
extern char *SPI_getrelname(Relation rel);
pgindent run before 6.3 release, with Thomas' requested changes.
1998-02-26 04:46:47 +00:00
extern void *SPI_palloc(Size size);
extern void *SPI_repalloc(void *pointer, Size size);
extern void SPI_pfree(void *pointer);
Some changes to prepare for LONG attributes. Jan
1999-12-16 22:20:03 +00:00
extern void SPI_freetuple(HeapTuple pointer);
Enhancement of SPI to get access to portals - New functions to create a portal using a prepared/saved SPI plan or lookup an existing portal by name. - Functions to fetch/move from/in portals. Results are placed in the usual SPI_processed and SPI_tuptable, so the entire set of utility functions can be used to gain attribute access. - Prepared/saved SPI plans now use their own memory context and SPI_freeplan(plan) can remove them. - Tuple result sets (SPI_tuptable) now uses it's own memory context and can be free'd by SPI_freetuptable(tuptab). Enhancement of PL/pgSQL - Uses generic named portals internally in FOR ... SELECT loops to avoid running out of memory on huge result sets. - Support for CURSOR and REFCURSOR syntax using the new SPI functionality. Cursors used internally only need no explicit transaction block. Refcursor variables can be used inside of explicit transaction block to pass cursors between main application and functions. Jan
2001-05-21 14:22:19 +00:00
extern void SPI_freetuptable(SPITupleTable *tuptable);
Adjust Tcl-related code to compile cleanly with Tcl 8.4 (add const modifiers as needed). Some desultory const-ification of SPI interface to support this.
2002-12-30 22:10:54 +00:00
extern Portal SPI_cursor_open(const char *name, void *plan,
Redesign query-snapshot timing so that volatile functions in READ COMMITTED mode see a fresh snapshot for each command in the function, rather than using the latest interactive command's snapshot. Also, suppress fresh snapshots as well as CommandCounterIncrement inside STABLE and IMMUTABLE functions, instead using the snapshot taken for the most closely nested regular query. (This behavior is only sane for read-only functions, so the patch also enforces that such functions contain only SELECT commands.) As per my proposal of 6-Sep-2004; I note that I floated essentially the same proposal on 19-Jun-2002, but that discussion tailed off without any action. Since 8.0 seems like the right place to be taking possibly nontrivial backwards compatibility hits, let's get it done now.
2004-09-13 20:10:13 +00:00
Datum *Values, const char *Nulls, bool read_only);
Adjust Tcl-related code to compile cleanly with Tcl 8.4 (add const modifiers as needed). Some desultory const-ification of SPI interface to support this.
2002-12-30 22:10:54 +00:00
extern Portal SPI_cursor_find(const char *name);
pgindent run on all C files. Java run to follow. initdb/regression tests pass.
2001-10-25 05:50:21 +00:00
extern void SPI_cursor_fetch(Portal portal, bool forward, int count);
extern void SPI_cursor_move(Portal portal, bool forward, int count);
extern void SPI_cursor_close(Portal portal);
SPI manager.
1997-08-29 09:05:57 +00:00
Add a warning to AtEOXact_SPI() to catch cases where the current transaction has been committed without SPI_finish() being called first. Per recent discussion here: http://archives.postgresql.org/pgsql-patches/2003-11/msg00286.php
2003-12-02 19:26:47 +00:00
extern void AtEOXact_SPI(bool isCommit);
Restructure subtransaction handling to reduce resource consumption, as per recent discussions. Invent SubTransactionIds that are managed like CommandIds (ie, counter is reset at start of each top transaction), and use these instead of TransactionIds to keep track of subtransaction status in those modules that need it. This means that a subtransaction does not need an XID unless it actually inserts/modifies rows in the database. Accordingly, don't assign it an XID nor take a lock on the XID until it tries to do that. This saves a lot of overhead for subtransactions that are only used for error recovery (eg plpgsql exceptions). Also, arrange to release a subtransaction's XID lock as soon as the subtransaction exits, in both the commit and abort cases. This avoids holding many unique locks after a long series of subtransactions. The price is some additional overhead in XactLockTableWait, but that seems acceptable. Finally, restructure the state machine in xact.c to have a more orthogonal set of states for subtransactions.
2004-09-16 16:58:44 +00:00
extern void AtEOSubXact_SPI(bool isCommit, SubTransactionId mySubid);
Another pgindent run. Fixes enum indenting, and improves #endif spacing. Also adds space for one-line comments.
2001-10-28 06:26:15 +00:00
New pgindent run with fixes suggested by Tom. Patch manually reviewed, initdb/regression tests pass.
2001-11-05 17:46:40 +00:00
#endif /* SPI_H */
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