for temp tables.
Gavin Sherry
<!--
-$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_table.sgml,v 1.56 2002/09/02 06:20:53 momjian Exp $
+$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_table.sgml,v 1.57 2002/11/09 23:56:38 momjian Exp $
PostgreSQL documentation
-->
| <replaceable>table_constraint</replaceable> } [, ... ]
)
[ INHERITS ( <replaceable>parent_table</replaceable> [, ... ] ) ]
-[ WITH OIDS | WITHOUT OIDS ]
+[ WITH OIDS | WITHOUT OIDS ] [ON COMMIT { PRESERVE ROWS | DELETE ROWS | DROP } ]
where <replaceable class="PARAMETER">column_constraint</replaceable> is:
<para>
If specified, the table is created as a temporary table.
Temporary tables are automatically dropped at the end of a
- session. Existing permanent tables with the same name are not
- visible to the current session while the temporary table exists,
- unless they are referenced with schema-qualified names.
- Any indexes created on a temporary table are automatically
+ session or optionally at the end of the current transaction
+ (See ON COMMIT below). Existing permanent tables with the same
+ name are not visible to the current session while the temporary
+ table exists, unless they are referenced with schema-qualified
+ names. Any indexes created on a temporary table are automatically
temporary as well.
</para>
</para>
</listitem>
</varlistentry>
- </variablelist>
+ <varlistentry>
+ <term><literal>ON COMMIT</literal></term>
+ <listitem>
+ <para>
+ The behaviour of temporary tables at the end of a transaction
+ block can be controlled using <literal>ON COMMIT</literal>.
+ The table will exhibit the same behavior at the end of
+ transaction blocks for the duration of the session unless
+ ON COMMIT DROP is specified or the temporary table is dropped.
+ </para>
+ <para>
+ The three parameters to ON COMMIT are:
+
+ <variablelist>
+ <varlistentry>
+ <term><literal>PRESERVE ROWS</literal></term>
+ <listitem>
+ <para>
+ The rows in the temporary table will persist after the
+ transaction block.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><literal>DELETE ROWS</literal></term>
+ <listitem>
+ <para>
+ All rows in the temporary table will be deleted at the
+ end of the transaction block.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><literal>DROP</literal></term>
+ <listitem>
+ <para>
+ The temporary table will be dropped at the end of the transaction.
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
</refsect1>
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/access/transam/xact.c,v 1.135 2002/10/22 22:44:36 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/access/transam/xact.c,v 1.136 2002/11/09 23:56:38 momjian Exp $
*
* NOTES
* Transaction aborts can now occur two ways:
#include "catalog/index.h"
#include "catalog/namespace.h"
#include "commands/async.h"
+#include "commands/tablecmds.h"
#include "commands/trigger.h"
#include "commands/user.h"
#include "executor/spi.h"
AtEOXact_hash();
AtEOXact_nbtree();
AtEOXact_rtree();
+ AtEOXact_temp_relations(true,s->blockState);
AtEOXact_Namespace(true);
AtEOXact_CatCache(true);
AtEOXact_Files();
AtEOXact_hash();
AtEOXact_nbtree();
AtEOXact_rtree();
+ AtEOXact_temp_relations(false,s->blockState);
AtEOXact_Namespace(false);
AtEOXact_CatCache(false);
AtEOXact_Files();
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/bootstrap/bootparse.y,v 1.53 2002/11/01 22:52:33 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/bootstrap/bootparse.y,v 1.54 2002/11/09 23:56:38 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#include "catalog/pg_class.h"
#include "catalog/pg_namespace.h"
#include "commands/defrem.h"
+#include "commands/tablecmds.h"
#include "miscadmin.h"
#include "nodes/makefuncs.h"
#include "nodes/nodes.h"
tupdesc,
RELKIND_RELATION,
$3,
+ ATEOXACTNOOP,
true);
elog(DEBUG3, "relation created with oid %u", id);
}
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/catalog/heap.c,v 1.232 2002/10/21 22:06:18 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/catalog/heap.c,v 1.233 2002/11/09 23:56:39 momjian Exp $
*
*
* INTERFACE ROUTINES
#include "access/heapam.h"
#include "access/genam.h"
+#include "access/xact.h"
#include "catalog/catalog.h"
#include "catalog/catname.h"
#include "catalog/dependency.h"
#include "catalog/heap.h"
#include "catalog/index.h"
#include "catalog/indexing.h"
+#include "catalog/namespace.h"
#include "catalog/pg_attrdef.h"
#include "catalog/pg_constraint.h"
#include "catalog/pg_inherits.h"
#include "catalog/pg_statistic.h"
#include "catalog/pg_type.h"
+#include "commands/tablecmds.h"
#include "commands/trigger.h"
#include "miscadmin.h"
#include "nodes/makefuncs.h"
* creates a new cataloged relation. see comments above.
* --------------------------------
*/
+
Oid
heap_create_with_catalog(const char *relname,
Oid relnamespace,
TupleDesc tupdesc,
char relkind,
bool shared_relation,
+ char ateoxact, /* Only used for temp relations */
bool allow_system_table_mods)
{
Relation pg_class_desc;
/* Assign an OID for the relation's tuple type */
new_type_oid = newoid();
+
+ /*
+ * Add to temprels if we are a temp relation now that we have oid
+ */
+
+ if(isTempNamespace(relnamespace)) {
+ TempTable *t;
+ MemoryContext oldcxt;
+
+ oldcxt = MemoryContextSwitchTo(CacheMemoryContext);
+ t = (TempTable *) palloc(sizeof(TempTable));
+ t->relid = new_rel_oid;
+ t->ateoxact = ateoxact;
+ t->tid = GetCurrentTransactionId();
+ t->dead = false;
+ reg_temp_rel(t);
+ MemoryContextSwitchTo(oldcxt);
+ }
+
/*
* now create an entry in pg_class for the relation.
*
rel->rd_rel->relkind != RELKIND_COMPOSITE_TYPE)
smgrunlink(DEFAULT_SMGR, rel);
+ /*
+ * Keep temprels up to date so that we don't have ON COMMIT execution
+ * problems at the end of the next transaction block
+ */
+
+ if(isTempNamespace(RelationGetNamespace(rel)))
+ rm_temp_rel(rid);
+
/*
* Close relcache entry, but *keep* AccessExclusiveLock on the
* relation until transaction commit. This ensures no one else will
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/catalog/namespace.c,v 1.38 2002/11/02 18:41:21 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/catalog/namespace.c,v 1.39 2002/11/09 23:56:39 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#include "catalog/pg_proc.h"
#include "catalog/pg_shadow.h"
#include "catalog/pg_type.h"
+#include "commands/tablecmds.h"
#include "lib/stringinfo.h"
#include "miscadmin.h"
#include "nodes/makefuncs.h"
CommitTransactionCommand(true);
}
+ free_temp_rels();
}
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/commands/cluster.c,v 1.91 2002/11/02 21:20:40 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/commands/cluster.c,v 1.92 2002/11/09 23:56:39 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#include "catalog/index.h"
#include "catalog/indexing.h"
#include "catalog/catname.h"
+#include "catalog/namespace.h"
#include "commands/cluster.h"
#include "commands/tablecmds.h"
#include "miscadmin.h"
tupdesc,
OldHeap->rd_rel->relkind,
OldHeap->rd_rel->relisshared,
+ ATEOXACTNOOP,
allowSystemTableMods);
/*
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/commands/tablecmds.c,v 1.51 2002/11/02 22:02:08 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/commands/tablecmds.c,v 1.52 2002/11/09 23:56:39 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
+#include "access/xact.h"
#include "access/genam.h"
#include "access/tuptoaster.h"
#include "catalog/catalog.h"
#include "utils/builtins.h"
#include "utils/fmgroids.h"
#include "utils/lsyscache.h"
-#include "utils/syscache.h"
#include "utils/relcache.h"
+#include "utils/syscache.h"
+static List *temprels = NIL;
static List *MergeAttributes(List *schema, List *supers, bool istemp,
List **supOids, List **supconstr, bool *supHasOids);
int i;
AttrNumber attnum;
+
/*
* Truncate relname to appropriate length (probably a waste of time,
* as parser should have done this already).
descriptor,
relkind,
false,
+ stmt->ateoxact,
allowSystemTableMods);
StoreCatalogInheritance(relationId, inheritOids);
* when its master is, so there's no need to handle the toast rel as
* temp.
*/
+
+ /*
+ * Pass ATEOXACTNOOP for ateoxact since we want heap_drop_with_catalog()
+ * to remove TOAST tables for temp tables, not AtEOXact_temp_relations()
+ */
+
toast_relid = heap_create_with_catalog(toast_relname,
PG_TOAST_NAMESPACE,
tupdesc,
RELKIND_TOASTVALUE,
shared_relation,
+ ATEOXACTNOOP,
true);
/* make the toast relation visible, else index creation will fail */
MAXALIGN(data_length);
return (tuple_length > TOAST_TUPLE_THRESHOLD);
}
+
+/*
+ * To handle ON COMMIT { DROP | PRESERVE ROWS | DELETE ROWS }
+ */
+void
+AtEOXact_temp_relations(bool iscommit, int bstate)
+{
+ List *l,
+ *prev;
+ MemoryContext oldctx;
+
+ if (temprels == NIL)
+ return;
+
+ /*
+ * These loops are tricky because we are removing items from the List
+ * while we are traversing it.
+ */
+
+
+ /* Remove 'dead' entries on commit and clear 'dead' status on abort */
+ l = temprels;
+ prev = NIL;
+ while (l != NIL)
+ {
+ TempTable *t = lfirst(l);
+
+ if (t->dead)
+ {
+ if (iscommit)
+ {
+ /* Remove from temprels, since the user has DROP'd */
+ oldctx = MemoryContextSwitchTo(CacheMemoryContext);
+ if (prev == NIL)
+ {
+ pfree(t);
+ temprels = lnext(l);
+ pfree(l);
+ l = temprels;
+ }
+ else
+ {
+ pfree(t);
+ lnext(prev) = lnext(l);
+ pfree(l);
+ l = lnext(prev);
+ }
+ MemoryContextSwitchTo(oldctx);
+ continue;
+ }
+ else
+ /* user dropped but now we're aborted */
+ t->dead = false;
+ }
+ prev = l;
+ l = lnext(l);
+ }
+
+ if ((iscommit && bstate != TBLOCK_END) ||
+ (!iscommit && bstate != TBLOCK_ABORT))
+ return;
+
+ /* Perform per-xact actions */
+ l = temprels;
+ prev = NIL;
+
+ if (iscommit)
+ {
+ while (l != NIL)
+ {
+ TempTable *t = lfirst(l);
+
+ if (t->ateoxact == ATEOXACTDROP)
+ {
+ ObjectAddress object;
+
+ object.classId = RelOid_pg_class;
+ object.objectId = t->relid;
+ object.objectSubId = 0;
+
+ performDeletion(&object, DROP_CASCADE);
+ oldctx = MemoryContextSwitchTo(CacheMemoryContext);
+
+ if (prev == NIL)
+ {
+ pfree(t);
+ temprels = lnext(l);
+ pfree(l);
+ l = temprels;
+ }
+ else
+ {
+ pfree(t);
+ lnext(prev) = lnext(l);
+ pfree(l);
+ l = lnext(prev);
+ }
+
+ MemoryContextSwitchTo(oldctx);
+ CommandCounterIncrement();
+ continue;
+ }
+ else if (t->ateoxact == ATEOXACTDELETE)
+ {
+ heap_truncate(t->relid);
+ CommandCounterIncrement();
+ }
+ prev = l;
+ l = lnext(l);
+ }
+ }
+ else
+ {
+ /* Abort --- remove entries added by this xact */
+ TransactionId curtid = GetCurrentTransactionId();
+
+ oldctx = MemoryContextSwitchTo(CacheMemoryContext);
+
+ while (l != NIL)
+ {
+ TempTable *t = lfirst(l);
+
+ if (t->tid == curtid)
+ {
+ if (prev == NIL)
+ {
+ pfree(t);
+ temprels = lnext(l);
+ pfree(l);
+ l = temprels;
+ }
+ else
+ {
+ pfree(t);
+ lnext(prev) = lnext(l);
+ pfree(l);
+ l = lnext(prev);
+ }
+ continue;
+ }
+ prev = l;
+ l = lnext(l);
+ }
+ MemoryContextSwitchTo(oldctx);
+ }
+}
+
+/*
+ * Register a temp rel in temprels
+ */
+
+void
+reg_temp_rel(TempTable * t)
+{
+ temprels = lcons(t, temprels);
+}
+
+/*
+ * return the ON COMMIT/ateoxact value for a given temp rel
+ */
+
+void
+free_temp_rels(void)
+{
+ MemoryContext oldctx;
+
+ oldctx = MemoryContextSwitchTo(CacheMemoryContext);
+ while (temprels != NIL)
+ {
+ List *l = temprels;
+
+ temprels = lnext(temprels);
+ pfree(lfirst(l));
+ pfree(l);
+ }
+ MemoryContextSwitchTo(oldctx);
+}
+
+/*
+ * Remove (actually just mark for deletion, in case we abort)
+ * Relid from the temprels list
+ */
+
+void
+rm_temp_rel(Oid relid)
+{
+ List *l;
+
+ foreach(l, temprels)
+ {
+ TempTable *t = lfirst(l);
+
+ if (t->relid == relid)
+ {
+ t->dead = true;
+ return;
+ }
+ }
+
+ /* If we get here, we're in trouble */
+ Assert(1==1);
+}
+
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/executor/execMain.c,v 1.180 2002/10/14 16:51:30 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/executor/execMain.c,v 1.181 2002/11/09 23:56:39 momjian Exp $
*
*-------------------------------------------------------------------------
*/
tupdesc,
RELKIND_RELATION,
false,
+ ATEOXACTNOOP,
allowSystemTableMods);
FreeTupleDesc(tupdesc);
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.373 2002/11/02 18:41:21 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.374 2002/11/09 23:56:39 momjian Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
#include "catalog/index.h"
#include "catalog/namespace.h"
#include "catalog/pg_type.h"
+#include "commands/tablecmds.h"
#include "nodes/makefuncs.h"
#include "nodes/params.h"
#include "nodes/parsenodes.h"
%type <typnam> func_arg func_return func_type aggr_argtype
%type <boolean> opt_arg TriggerForType OptTemp OptWithOids
+%type <chr> OptEOXact
%type <list> for_update_clause opt_for_update_clause update_list
%type <boolean> opt_all
ORDER OUT_P OUTER_P OVERLAPS OVERLAY OWNER
PARTIAL PASSWORD PATH_P PENDANT PLACING POSITION
- PRECISION PREPARE PRIMARY PRIOR PRIVILEGES PROCEDURAL PROCEDURE
+ PRECISION PRESERVE PREPARE PRIMARY PRIOR PRIVILEGES PROCEDURAL
+ PROCEDURE
READ REAL RECHECK REFERENCES REINDEX RELATIVE RENAME REPLACE
- RESET RESTRICT RETURNS REVOKE RIGHT ROLLBACK ROW
+ RESET RESTRICT RETURNS REVOKE RIGHT ROLLBACK ROW ROWS
RULE
SCHEMA SCROLL SECOND_P SECURITY SELECT SEQUENCE
*****************************************************************************/
CreateStmt: CREATE OptTemp TABLE qualified_name '(' OptTableElementList ')'
- OptInherit OptWithOids
+ OptInherit OptWithOids OptEOXact
{
CreateStmt *n = makeNode(CreateStmt);
+
+ if($2 == FALSE && $10 != ATEOXACTNOOP)
+ elog(ERROR,"ON COMMIT can only be used on TEMP tables");
+
$4->istemp = $2;
n->relation = $4;
n->tableElts = $6;
n->inhRelations = $8;
n->constraints = NIL;
n->hasoids = $9;
+ n->ateoxact = $10;
$$ = (Node *)n;
}
| CREATE OptTemp TABLE qualified_name OF qualified_name
| /*EMPTY*/ { $$ = TRUE; }
;
-
+OptEOXact: ON COMMIT DROP { $$ = ATEOXACTDROP; }
+ | ON COMMIT DELETE_P ROWS { $$ = ATEOXACTDELETE; }
+ | ON COMMIT PRESERVE ROWS { $$ = ATEOXACTPRESERVE; }
+ | /*EMPTY*/ { $$ = ATEOXACTNOOP; }
+ ;
/*
* Note: CREATE TABLE ... AS SELECT ... is just another spelling for
* SELECT ... INTO.
| PENDANT
| PRECISION
| PREPARE
+ | PRESERVE
| PRIOR
| PRIVILEGES
| PROCEDURAL
| RETURNS
| REVOKE
| ROLLBACK
+ | ROWS
| RULE
| SCHEMA
| SCROLL
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/parser/keywords.c,v 1.127 2002/09/18 21:35:22 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/parser/keywords.c,v 1.128 2002/11/09 23:56:39 momjian Exp $
*
*-------------------------------------------------------------------------
*/
{"position", POSITION},
{"precision", PRECISION},
{"prepare", PREPARE},
+ {"preserve", PRESERVE},
{"primary", PRIMARY},
{"prior", PRIOR},
{"privileges", PRIVILEGES},
{"right", RIGHT},
{"rollback", ROLLBACK},
{"row", ROW},
+ {"rows",ROWS},
{"rule", RULE},
{"schema", SCHEMA},
{"scroll", SCROLL},
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $Id: heap.h,v 1.57 2002/09/04 20:31:37 momjian Exp $
+ * $Id: heap.h,v 1.58 2002/11/09 23:56:39 momjian Exp $
*
*-------------------------------------------------------------------------
*/
TupleDesc tupdesc,
char relkind,
bool shared_relation,
+ char ateoxact,
bool allow_system_table_mods);
extern void heap_drop_with_catalog(Oid rid);
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $Id: tablecmds.h,v 1.8 2002/10/21 20:31:52 momjian Exp $
+ * $Id: tablecmds.h,v 1.9 2002/11/09 23:56:39 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef TABLECMDS_H
#define TABLECMDS_H
+#include "access/htup.h"
#include "nodes/parsenodes.h"
extern void AlterTableAddColumn(Oid myrelid, bool recurse, ColumnDef *colDef);
extern void renamerel(Oid myrelid,
const char *newrelname);
+/*
+ * Temp rel stuff
+ */
+typedef struct TempTable
+{
+ Oid relid; /* relid of temp relation */
+ char ateoxact; /* what to do at end of xact */
+ TransactionId tid; /* trans id where in rel was created */
+ bool dead; /* table was dropped in the current xact */
+} TempTable;
+
+extern void AtEOXact_temp_relations(bool iscommit, int bstate);
+extern void reg_temp_rel(TempTable *t);
+extern void free_temp_rels(void);
+extern void rm_temp_rel(Oid relid);
+
+/*
+ * What to do at commit time for temporary relations
+ */
+
+#define ATEOXACTNOOP 0 /* no operation at commit */
+#define ATEOXACTPRESERVE 1 /* preserve rows */
+#define ATEOXACTDELETE 2 /* delete rows */
+#define ATEOXACTDROP 3 /* drop temp table */
+
#endif /* TABLECMDS_H */
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $Id: parsenodes.h,v 1.210 2002/11/06 00:00:44 tgl Exp $
+ * $Id: parsenodes.h,v 1.211 2002/11/09 23:56:39 momjian Exp $
*
*-------------------------------------------------------------------------
*/
List *inhRelations; /* relations to inherit from */
List *constraints; /* constraints (list of Constraint nodes) */
bool hasoids; /* should it have OIDs? */
+ char ateoxact; /* what do we do at COMMIT for TEMP ? */
} CreateStmt;
/* ----------
projects / postgresql / commitdiff