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

Browse Source 
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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32
src/backend/commands/prepare.c
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@ -10,7 +10,7 @@
* Copyright (c) 2002-2007, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/prepare.c,v 1.70 2007/03/13 00:33:39 tgl Exp $
* $PostgreSQL: pgsql/src/backend/commands/prepare.c,v 1.71 2007/04/12 06:53:46 neilc Exp $
*
*-------------------------------------------------------------------------
*/
@ -575,7 +575,10 @@ FetchPreparedStatementTargetList(PreparedStatement *stmt)
void
DeallocateQuery(DeallocateStmt *stmt)
{
DropPreparedStatement(stmt->name, true);
if (stmt->name)
DropPreparedStatement(stmt->name, true);
else
DropAllPreparedStatements();
}
/*
@ -601,6 +604,31 @@ DropPreparedStatement(const char *stmt_name, bool showError)
}
}
/*
* Drop all cached statements.
*/
void
DropAllPreparedStatements(void)
{
HASH_SEQ_STATUS seq;
PreparedStatement *entry;
/* nothing cached */
if (!prepared_queries)
return;
/* walk over cache */
hash_seq_init(&seq, prepared_queries);
while ((entry = hash_seq_search(&seq)) != NULL)
{
/* Release the plancache entry */
DropCachedPlan(entry->plansource);
/* Now we can remove the hash table entry */
hash_search(prepared_queries, entry->stmt_name, HASH_REMOVE, NULL);
}
}
/*
* Implements the 'EXPLAIN EXECUTE' utility statement.
*/