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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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20
src/backend/parser/gram.y
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@@ -11,7 +11,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.587 2007/04/08 00:26:34 momjian Exp $
* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.588 2007/04/12 06:53:46 neilc Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@@ -1667,6 +1667,12 @@ ClosePortalStmt:
n->portalname = $2;
$$ = (Node *)n;
}
| CLOSE ALL
{
ClosePortalStmt *n = makeNode(ClosePortalStmt);
n->portalname = NULL;
$$ = (Node *)n;
}
;
@@ -5591,6 +5597,18 @@ DeallocateStmt: DEALLOCATE name
n->name = $3;
$$ = (Node *) n;
}
| DEALLOCATE ALL
{
DeallocateStmt *n = makeNode(DeallocateStmt);
n->name = NULL;
$$ = (Node *) n;
}
| DEALLOCATE PREPARE ALL
{
DeallocateStmt *n = makeNode(DeallocateStmt);
n->name = NULL;
$$ = (Node *) n;
}
;
/*****************************************************************************