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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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37
src/backend/utils/misc/guc.c
View File

@@ -10,7 +10,7 @@
* Written by Peter Eisentraut <peter_e@gmx.net>.
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.383 2007/03/19 23:38:30 wieck Exp $
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.384 2007/04/12 06:53:47 neilc Exp $
*
*--------------------------------------------------------------------
*/
@@ -32,6 +32,7 @@
#include "access/xact.h"
#include "catalog/namespace.h"
#include "commands/async.h"
#include "commands/prepare.h"
#include "commands/vacuum.h"
#include "commands/variable.h"
#include "commands/trigger.h"
@@ -61,6 +62,7 @@
#include "utils/memutils.h"
#include "utils/pg_locale.h"
#include "utils/plancache.h"
#include "utils/portal.h"
#include "utils/ps_status.h"
#include "utils/tzparser.h"
#include "utils/xml.h"
@@ -4951,14 +4953,45 @@ GetPGVariableResultDesc(const char *name)
return tupdesc;
}
/*
* RESET SESSION command.
*/
static void
ResetSession(bool isTopLevel)
{
/*
* Disallow RESET SESSION in a transaction block. This is arguably
* inconsistent (we don't make a similar check in the command
* sequence that RESET SESSION is equivalent to), but the idea is
* to catch mistakes: RESET SESSION inside a transaction block
* would leave the transaction still uncommitted.
*/
PreventTransactionChain(isTopLevel, "RESET SESSION");
SetPGVariable("session_authorization", NIL, false);
ResetAllOptions();
DropAllPreparedStatements();
PortalHashTableDeleteAll();
Async_UnlistenAll();
ResetPlanCache();
ResetTempTableNamespace();
}
/*
* RESET command
*/
void
ResetPGVariable(const char *name)
ResetPGVariable(const char *name, bool isTopLevel)
{
if (pg_strcasecmp(name, "all") == 0)
ResetAllOptions();
else if (pg_strcasecmp(name, "session") == 0)
ResetSession(isTopLevel);
else if (pg_strcasecmp(name, "temp") == 0 ||
pg_strcasecmp(name, "temporary") == 0)
ResetTempTableNamespace();
else if (pg_strcasecmp(name, "plans") == 0)
ResetPlanCache();
else
set_config_option(name,
NULL,