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Rename the newly-added commands for discarding session state.

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RESET SESSION, RESET PLANS, and RESET TEMP are now DISCARD ALL,
DISCARD PLANS, and DISCARD TEMP, respectively. This is to avoid
confusion with the pre-existing RESET variants: the DISCARD
commands are not actually similar to RESET. Patch from Marko
Kreen, with some minor editorialization.
This commit is contained in:
Neil Conway
2007-04-26 16:13:15 +00:00
parent 5ea27a4b28
commit 16efdb5ec7
19 changed files with 345 additions and 133 deletions
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71
src/backend/commands/discard.c Normal file
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/*-------------------------------------------------------------------------
*
* discard.c
* The implementation of the DISCARD command
*
* Copyright (c) 1996-2007, PostgreSQL Global Development Group
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/discard.c,v 1.1 2007/04/26 16:13:10 neilc Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/xact.h"
#include "catalog/namespace.h"
#include "commands/async.h"
#include "commands/discard.h"
#include "commands/prepare.h"
#include "commands/variable.h"
#include "utils/plancache.h"
#include "utils/portal.h"
static void DiscardAll(bool isTopLevel);
/*
* DISCARD { ALL | TEMP | PLANS }
*/
void
DiscardCommand(DiscardStmt *stmt, bool isTopLevel)
{
switch (stmt->target)
{
case DISCARD_ALL:
DiscardAll(isTopLevel);
break;
case DISCARD_PLANS:
ResetPlanCache();
break;
case DISCARD_TEMP:
ResetTempTableNamespace();
break;
default:
elog(ERROR, "unrecognized DISCARD target: %d", stmt->target);
}
}
static void
DiscardAll(bool isTopLevel)
{
/*
* Disallow DISCARD ALL in a transaction block. This is arguably
* inconsistent (we don't make a similar check in the command
* sequence that DISCARD ALL is equivalent to), but the idea is
* to catch mistakes: DISCARD ALL inside a transaction block
* would leave the transaction still uncommitted.
*/
PreventTransactionChain(isTopLevel, "DISCARD ALL");
SetPGVariable("session_authorization", NIL, false);
ResetAllOptions();
DropAllPreparedStatements();
PortalHashTableDeleteAll();
Async_UnlistenAll();
ResetPlanCache();
ResetTempTableNamespace();
}