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RESET SESSION, plus related new DDL commands. Patch from Marko Kreen,

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reviewed by Neil Conway. This patch adds the following DDL command
variants: RESET SESSION, RESET TEMP, RESET PLANS, CLOSE ALL, and
DEALLOCATE ALL. RESET SESSION is intended for use by connection
pool software and the like, in order to reset a client session
to something close to its initial state.

Note that while most of these command variants can be executed
inside a transaction block (but are not transaction-aware!),
RESET SESSION cannot. While this is inconsistent, it is intended
to catch programmer mistakes: RESET SESSION in an open transaction
block is probably unintended.
This commit is contained in:
Neil Conway
2007-04-12 06:53:49 +00:00
parent e6e47f278d
commit d13e903bea
25 changed files with 479 additions and 38 deletions
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11
src/backend/utils/cache/plancache.c vendored
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@ -33,7 +33,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/cache/plancache.c,v 1.5 2007/03/26 00:36:19 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/cache/plancache.c,v 1.6 2007/04/12 06:53:47 neilc Exp $
*
*-------------------------------------------------------------------------
*/
@ -880,6 +880,15 @@ PlanCacheCallback(Datum arg, Oid relid)
}
}
/*
* ResetPlanCache: drop all cached plans.
*/
void
ResetPlanCache(void)
{
PlanCacheCallback((Datum) 0, InvalidOid);
}
/*
* ScanQueryForRelids callback function for PlanCacheCallback
*/