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Expose more cursor-related functionality in SPI: specifically, allow

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access to the planner's cursor-related planning options, and provide new
FETCH/MOVE routines that allow access to the full power of those commands.
Small refactoring of planner(), pg_plan_query(), and pg_plan_queries()
APIs to make it convenient to pass the planning options down from SPI.

This is the core-code portion of Pavel Stehule's patch for scrollable
cursor support in plpgsql; I'll review and apply the plpgsql changes
separately.
This commit is contained in:
Tom Lane
2007-04-16 01:14:58 +00:00
parent fa92d21a48
commit 66888f7424
15 changed files with 435 additions and 71 deletions
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11
src/include/executor/spi.h
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@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/executor/spi.h,v 1.60 2007/03/25 23:27:59 tgl Exp $
* $PostgreSQL: pgsql/src/include/executor/spi.h,v 1.61 2007/04/16 01:14:57 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -20,8 +20,8 @@
#include "postgres.h"
/*
* These are not needed by this file, but used by other programs
* using SPI
* Most of these are not needed by this file, but may be used by
* user-written code that uses SPI
*/
#include "access/heapam.h"
#include "access/xact.h"
@ -32,6 +32,7 @@
#include "executor/executor.h"
#include "nodes/execnodes.h"
#include "nodes/params.h"
#include "nodes/parsenodes.h"
#include "nodes/plannodes.h"
#include "nodes/primnodes.h"
#include "nodes/relation.h"
@ -105,6 +106,8 @@ extern int SPI_execute_snapshot(SPIPlanPtr plan,
Snapshot crosscheck_snapshot,
bool read_only, long tcount);
extern SPIPlanPtr SPI_prepare(const char *src, int nargs, Oid *argtypes);
extern SPIPlanPtr SPI_prepare_cursor(const char *src, int nargs, Oid *argtypes,
int cursorOptions);
extern SPIPlanPtr SPI_saveplan(SPIPlanPtr plan);
extern int SPI_freeplan(SPIPlanPtr plan);
@ -136,6 +139,8 @@ extern Portal SPI_cursor_open(const char *name, SPIPlanPtr plan,
extern Portal SPI_cursor_find(const char *name);
extern void SPI_cursor_fetch(Portal portal, bool forward, long count);
extern void SPI_cursor_move(Portal portal, bool forward, long count);
extern void SPI_scroll_cursor_fetch(Portal, FetchDirection direction, long count);
extern void SPI_scroll_cursor_move(Portal, FetchDirection direction, long count);
extern void SPI_cursor_close(Portal portal);
extern void AtEOXact_SPI(bool isCommit);