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Add support for invoking parser callback hooks via SPI and in cached plans.

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As proof of concept, modify plpgsql to use the hooks.  plpgsql is still
inserting $n symbols textually, but the "back end" of the parsing process now
goes through the ParamRef hook instead of using a fixed parameter-type array,
and then execution only fetches actually-referenced parameters, using a hook
added to ParamListInfo.

Although there's a lot left to be done in plpgsql, this already cures the
"if (TG_OP = 'INSERT' and NEW.foo ...)"  problem, as illustrated by the
changed regression test.
This commit is contained in:
Tom Lane
2009-11-04 22:26:08 +00:00
parent 48912acc08
commit 9bedd128d6
23 changed files with 1110 additions and 533 deletions
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11
src/include/executor/spi.h
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@@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/executor/spi.h,v 1.72 2009/06/11 14:49:11 momjian Exp $
* $PostgreSQL: pgsql/src/include/executor/spi.h,v 1.73 2009/11/04 22:26:06 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -73,6 +73,9 @@ extern void SPI_restore_connection(void);
extern int SPI_execute(const char *src, bool read_only, long tcount);
extern int SPI_execute_plan(SPIPlanPtr plan, Datum *Values, const char *Nulls,
bool read_only, long tcount);
extern int SPI_execute_plan_with_paramlist(SPIPlanPtr plan,
ParamListInfo params,
bool read_only, long tcount);
extern int SPI_exec(const char *src, long tcount);
extern int SPI_execp(SPIPlanPtr plan, Datum *Values, const char *Nulls,
long tcount);
@@ -88,6 +91,10 @@ extern int SPI_execute_with_args(const char *src,
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_prepare_params(const char *src,
ParserSetupHook parserSetup,
void *parserSetupArg,
int cursorOptions);
extern SPIPlanPtr SPI_saveplan(SPIPlanPtr plan);
extern int SPI_freeplan(SPIPlanPtr plan);
@@ -122,6 +129,8 @@ extern Portal SPI_cursor_open_with_args(const char *name,
int nargs, Oid *argtypes,
Datum *Values, const char *Nulls,
bool read_only, int cursorOptions);
extern Portal SPI_cursor_open_with_paramlist(const char *name, SPIPlanPtr plan,
ParamListInfo params, bool read_only);
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);

4
src/include/executor/spi_priv.h
View File

@@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/executor/spi_priv.h,v 1.32 2009/01/01 17:23:59 momjian Exp $
* $PostgreSQL: pgsql/src/include/executor/spi_priv.h,v 1.33 2009/11/04 22:26:06 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -68,6 +68,8 @@ typedef struct _SPI_plan
int cursor_options; /* Cursor options used for planning */
int nargs; /* number of plan arguments */
Oid *argtypes; /* Argument types (NULL if nargs is 0) */
ParserSetupHook parserSetup; /* alternative parameter spec method */
void *parserSetupArg;
} _SPI_plan;
#endif /* SPI_PRIV_H */