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Add RESET CONNECTION, to reset all aspects of a session.

Browse Source 
Hans-J?rgen Sch?nig
This commit is contained in:
Bruce Momjian 2006-04-25 14:09:21 +00:00
parent 11fbdf2f25
commit 6378fdd971
12 changed files with 128 additions and 20 deletions
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24
doc/src/sgml/ref/reset.sgml
View File

@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/ref/reset.sgml,v 1.26 2003/12/14 00:15:03 neilc Exp $
$PostgreSQL: pgsql/doc/src/sgml/ref/reset.sgml,v 1.27 2006/04/25 14:09:06 momjian Exp $
PostgreSQL documentation
-->
@ -11,7 +11,8 @@ PostgreSQL documentation
<refnamediv>
<refname>RESET</refname>
<refpurpose>restore the value of a run-time parameter to the default value</refpurpose>
<refpurpose>restore the value of a run-time parameter to the default value,
or reset all aspects of a session</refpurpose>
</refnamediv>
<indexterm zone="sql-reset">
@ -22,6 +23,7 @@ PostgreSQL documentation
<synopsis>
RESET <replaceable class="PARAMETER">name</replaceable>
RESET ALL
RESET CONNECTION
</synopsis>
</refsynopsisdiv>
@ -50,8 +52,11 @@ SET <replaceable class="parameter">parameter</replaceable> TO DEFAULT
<para>
See the <command>SET</> reference page for details on the
transaction behavior of <command>RESET</>.
transaction behavior of <command>RESET</>. <command>RESET
CONNECTION</command> can be used to reset all aspects of
a session, not just parameter values.
</para>
</refsect1>
<refsect1>
@ -76,7 +81,20 @@ SET <replaceable class="parameter">parameter</replaceable> TO DEFAULT
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>CONNECTION</literal></term>
<listitem>
<para>
Reset the all aspects of a session, including runtime parameters,
transaction status, temporary tables, <literal>WITH HOLD</literal>
cursors, prepared statements, and <command>LISTEN</command>
registrations.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>

5
src/backend/catalog/namespace.c
View File

@ -13,7 +13,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/catalog/namespace.c,v 1.82 2006/03/05 15:58:22 momjian Exp $
* $PostgreSQL: pgsql/src/backend/catalog/namespace.c,v 1.83 2006/04/25 14:09:08 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -134,7 +134,6 @@ char *namespace_search_path = NULL;
/* Local functions */
static void recomputeNamespacePath(void);
static void InitTempTableNamespace(void);
static void RemoveTempRelations(Oid tempNamespaceId);
static void RemoveTempRelationsCallback(int code, Datum arg);
static void NamespaceCallback(Datum arg, Oid relid);
@ -1729,7 +1728,7 @@ AtEOSubXact_Namespace(bool isCommit, SubTransactionId mySubid,
* in order to clean out any relations that might have been created by
* a crashed backend.
*/
static void
void
RemoveTempRelations(Oid tempNamespaceId)
{
ObjectAddress object;

5
src/backend/commands/async.c
View File

@ -7,7 +7,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/async.c,v 1.129 2006/03/05 15:58:23 momjian Exp $
* $PostgreSQL: pgsql/src/backend/commands/async.c,v 1.130 2006/04/25 14:09:10 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -127,7 +127,6 @@ static bool unlistenExitRegistered = false;
bool Trace_notify = false;
static void Async_UnlistenAll(void);
static void Async_UnlistenOnExit(int code, Datum arg);
static void ProcessIncomingNotify(void);
static void NotifyMyFrontEnd(char *relname, int32 listenerPID);
@ -335,7 +334,7 @@ Async_Unlisten(const char *relname)
*
*--------------------------------------------------------------
*/
static void
void
Async_UnlistenAll(void)
{
Relation lRel;

27
src/backend/commands/prepare.c
View File

@ -10,7 +10,7 @@
* Copyright (c) 2002-2006, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/prepare.c,v 1.50 2006/04/22 01:25:58 tgl Exp $
* $PostgreSQL: pgsql/src/backend/commands/prepare.c,v 1.51 2006/04/25 14:09:11 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -33,7 +33,6 @@
#include "utils/hsearch.h"
#include "utils/memutils.h"
/*
* The hash table in which prepared queries are stored. This is
* per-backend: query plans are not shared between backends.
@ -547,6 +546,30 @@ DeallocateQuery(DeallocateStmt *stmt)
DropPreparedStatement(stmt->name, true);
}
/*
* Remove all prepared plans from the backend.
*/
void
DropAllPreparedStatements(void)
{
PreparedStatement *prep_statement;
HASH_SEQ_STATUS status;
if (!prepared_queries)
return;
hash_seq_init(&status, prepared_queries);
while ((prep_statement = (PreparedStatement *) hash_seq_search(&status)))
{
DropDependentPortals(prep_statement->context);
/* Flush the context holding the subsidiary data */
MemoryContextDelete(prep_statement->context);
hash_search(prepared_queries, prep_statement->stmt_name, HASH_REMOVE, NULL);
}
}
/*
* Internal version of DEALLOCATE
*

8
src/backend/parser/gram.y
View File

@ -11,7 +11,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.540 2006/04/24 22:59:19 momjian Exp $
* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.541 2006/04/25 14:09:12 momjian Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@ -1244,6 +1244,12 @@ VariableResetStmt:
n->name = $2;
$$ = (Node *) n;
}
| RESET CONNECTION
{
VariableResetStmt *n = makeNode(VariableResetStmt);
n->name = "connection";
$$ = (Node *) n;
}
| RESET TIME ZONE
{
VariableResetStmt *n = makeNode(VariableResetStmt);

33
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 1.315 2006/04/10 21:53:38 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.316 2006/04/25 14:09:15 momjian Exp $
*
*--------------------------------------------------------------------
*/
@ -32,6 +32,7 @@
#include "catalog/namespace.h"
#include "catalog/pg_type.h"
#include "commands/async.h"
#include "commands/prepare.h"
#include "commands/variable.h"
#include "commands/vacuum.h"
#include "executor/executor.h"
@ -53,6 +54,7 @@
#include "postmaster/bgwriter.h"
#include "postmaster/syslogger.h"
#include "postmaster/postmaster.h"
#include "storage/backendid.h"
#include "storage/bufmgr.h"
#include "storage/fd.h"
#include "storage/freespace.h"
@ -61,11 +63,13 @@
#include "tcop/tcopprot.h"
#include "utils/array.h"
#include "utils/builtins.h"
#include "utils/hsearch.h"
#include "utils/memutils.h"
#include "utils/pg_locale.h"
#include "utils/portal.h"
#include "utils/syscache.h"
#include "pgstat.h"
#ifndef PG_KRB_SRVTAB
#define PG_KRB_SRVTAB ""
#endif
@ -4649,8 +4653,33 @@ GetPGVariableResultDesc(const char *name)
void
ResetPGVariable(const char *name)
{
char namespaceName[NAMEDATALEN];
Oid namespaceId;
if (pg_strcasecmp(name, "all") == 0)
/* resetting all GUC variables */
ResetAllOptions();
else if (pg_strcasecmp(name, "connection") == 0)
{
ResetAllOptions();
/* Clean temp-tables */
snprintf(namespaceName, sizeof(namespaceName), "pg_temp_%d",
MyBackendId);
namespaceId = GetSysCacheOid(NAMESPACENAME,
CStringGetDatum(namespaceName), 0, 0, 0);
RemoveTempRelations(namespaceId);
DropAllPreparedStatements();
Async_UnlistenAll();
/* Delete cursors, including WITH HOLD */
PortalHashTableDeleteAll();
if (IsTransactionBlock())
UserAbortTransactionBlock();
}
else
set_config_option(name,
NULL,

29
src/backend/utils/mmgr/portalmem.c
View File

@ -12,7 +12,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/mmgr/portalmem.c,v 1.85 2006/03/05 15:58:49 momjian Exp $
* $PostgreSQL: pgsql/src/backend/utils/mmgr/portalmem.c,v 1.86 2006/04/25 14:09:16 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -402,6 +402,9 @@ DropDependentPortals(MemoryContext queryContext)
HASH_SEQ_STATUS status;
PortalHashEnt *hentry;
if (PortalHashTable == NULL)
return;
hash_seq_init(&status, PortalHashTable);
while ((hentry = (PortalHashEnt *) hash_seq_search(&status)) != NULL)
@ -413,6 +416,30 @@ DropDependentPortals(MemoryContext queryContext)
}
}
/*
* Delete all WITH HOLD cursors, used by RESET CONNECTION
*/
void
PortalHashTableDeleteAll(void)
{
HASH_SEQ_STATUS status;
PortalHashEnt *hentry;
if (PortalHashTable == NULL)
return;
hash_seq_init(&status, PortalHashTable);
while ((hentry = (PortalHashEnt *) hash_seq_search(&status)) != NULL)
{
Portal portal = hentry->portal;
if ((portal->cursorOptions & CURSOR_OPT_HOLD) &&
portal->status != PORTAL_ACTIVE)
PortalDrop(portal, false);
}
}
/*
* Pre-commit processing for portals.

4
src/include/catalog/namespace.h
View File

@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/catalog/namespace.h,v 1.39 2006/03/05 15:58:54 momjian Exp $
* $PostgreSQL: pgsql/src/include/catalog/namespace.h,v 1.40 2006/04/25 14:09:16 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -74,6 +74,8 @@ extern void PopSpecialNamespace(Oid namespaceId);
extern Oid FindConversionByName(List *conname);
extern Oid FindDefaultConversionProc(int4 for_encoding, int4 to_encoding);
extern void RemoveTempRelations(Oid tempNamespaceId);
/* initialization & transaction cleanup code */
extern void InitializeSearchPath(void);
extern void AtEOXact_Namespace(bool isCommit);

3
src/include/commands/async.h
View File

@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/commands/async.h,v 1.31 2006/03/05 15:58:55 momjian Exp $
* $PostgreSQL: pgsql/src/include/commands/async.h,v 1.32 2006/04/25 14:09:17 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -19,6 +19,7 @@ extern bool Trace_notify;
extern void Async_Notify(const char *relname);
extern void Async_Listen(const char *relname);
extern void Async_Unlisten(const char *relname);
extern void Async_UnlistenAll(void);
/* perform (or cancel) outbound notify processing at transaction commit */
extern void AtCommit_Notify(void);

3
src/include/commands/prepare.h
View File

@ -6,7 +6,7 @@
*
* Copyright (c) 2002-2006, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/include/commands/prepare.h,v 1.18 2006/03/05 15:58:55 momjian Exp $
* $PostgreSQL: pgsql/src/include/commands/prepare.h,v 1.19 2006/04/25 14:09:18 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -62,6 +62,7 @@ extern void StorePreparedStatement(const char *stmt_name,
extern PreparedStatement *FetchPreparedStatement(const char *stmt_name,
bool throwError);
extern void DropPreparedStatement(const char *stmt_name, bool showError);
extern void DropAllPreparedStatements(void);
extern List *FetchPreparedStatementParams(const char *stmt_name);
extern TupleDesc FetchPreparedStatementResultDesc(PreparedStatement *stmt);
extern bool PreparedStatementReturnsTuples(PreparedStatement *stmt);

3
src/include/utils/portal.h
View File

@ -39,7 +39,7 @@
* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/utils/portal.h,v 1.59 2006/03/05 15:59:07 momjian Exp $
* $PostgreSQL: pgsql/src/include/utils/portal.h,v 1.60 2006/04/25 14:09:19 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -200,6 +200,7 @@ extern void AtSubAbort_Portals(SubTransactionId mySubid,
extern void AtSubCleanup_Portals(SubTransactionId mySubid);
extern Portal CreatePortal(const char *name, bool allowDup, bool dupSilent);
extern Portal CreateNewPortal(void);
extern void PortalHashTableDeleteAll(void);
extern void PortalDrop(Portal portal, bool isTopCommit);
extern void DropDependentPortals(MemoryContext queryContext);
extern Portal GetPortalByName(const char *name);

4
src/interfaces/ecpg/preproc/preproc.y
View File

@ -1,4 +1,4 @@
/* $PostgreSQL: pgsql/src/interfaces/ecpg/preproc/preproc.y,v 1.321 2006/03/07 01:00:19 tgl Exp $ */
/* $PostgreSQL: pgsql/src/interfaces/ecpg/preproc/preproc.y,v 1.322 2006/04/25 14:09:21 momjian Exp $ */
/* Copyright comment */
%{
@ -1196,6 +1196,8 @@ VariableResetStmt: RESET var_name
{ $$ = make_str("reset transaction isolation level"); }
| RESET SESSION AUTHORIZATION
{ $$ = make_str("reset session authorization"); }
| RESET CONNECTION
{ $$ = make_str("reset connection"); }
| RESET ALL
{ $$ = make_str("reset all"); }
;