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Commita3b012b

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committed
CREATE TABLE IF NOT EXISTS.
Reviewed by Bernd Helmle.
1 parentedff75b commita3b012b

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21 files changed

+145
-31
lines changed

21 files changed

+145
-31
lines changed

‎doc/src/sgml/ref/create_table.sgml‎

Lines changed: 15 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,5 @@
11
<!--
2-
$PostgreSQL: pgsql/doc/src/sgml/ref/create_table.sgml,v 1.128 2010/06/07 02:59:02 itagaki Exp $
2+
$PostgreSQL: pgsql/doc/src/sgml/ref/create_table.sgml,v 1.129 2010/07/25 23:21:21 rhaas Exp $
33
PostgreSQL documentation
44
-->
55

@@ -21,7 +21,7 @@ PostgreSQL documentation
2121

2222
<refsynopsisdiv>
2323
<synopsis>
24-
CREATE [ [ GLOBAL | LOCAL ] { TEMPORARY | TEMP } ] TABLE <replaceable class="PARAMETER">table_name</replaceable> ( [
24+
CREATE [ [ GLOBAL | LOCAL ] { TEMPORARY | TEMP } ] TABLE[ IF NOT EXISTS ]<replaceable class="PARAMETER">table_name</replaceable> ( [
2525
{ <replaceable class="PARAMETER">column_name</replaceable> <replaceable class="PARAMETER">data_type</replaceable> [ DEFAULT <replaceable>default_expr</replaceable> ] [ <replaceable class="PARAMETER">column_constraint</replaceable> [ ... ] ]
2626
| <replaceable>table_constraint</replaceable>
2727
| LIKE <replaceable>parent_table</replaceable> [ <replaceable>like_option</replaceable> ... ] }
@@ -32,7 +32,7 @@ CREATE [ [ GLOBAL | LOCAL ] { TEMPORARY | TEMP } ] TABLE <replaceable class="PAR
3232
[ ON COMMIT { PRESERVE ROWS | DELETE ROWS | DROP } ]
3333
[ TABLESPACE <replaceable class="PARAMETER">tablespace</replaceable> ]
3434

35-
CREATE [ [ GLOBAL | LOCAL ] { TEMPORARY | TEMP } ] TABLE <replaceable class="PARAMETER">table_name</replaceable>
35+
CREATE [ [ GLOBAL | LOCAL ] { TEMPORARY | TEMP } ] TABLE[ IF NOT EXISTS ]<replaceable class="PARAMETER">table_name</replaceable>
3636
OF <replaceable class="PARAMETER">type_name</replaceable> [ (
3737
{ <replaceable class="PARAMETER">column_name</replaceable> WITH OPTIONS [ DEFAULT <replaceable>default_expr</replaceable> ] [ <replaceable class="PARAMETER">column_constraint</replaceable> [ ... ] ]
3838
| <replaceable>table_constraint</replaceable> }
@@ -163,6 +163,18 @@ CREATE [ [ GLOBAL | LOCAL ] { TEMPORARY | TEMP } ] TABLE <replaceable class="PAR
163163
</listitem>
164164
</varlistentry>
165165

166+
<varlistentry>
167+
<term><literal>IF NOT EXISTS</></term>
168+
<listitem>
169+
<para>
170+
Do not throw an error if a relation with the same name already exists.
171+
A notice is issued in this case. Note that there is no guarantee that
172+
the existing relation is anything like the one that would have been
173+
created.
174+
</para>
175+
</listitem>
176+
</varlistentry>
177+
166178
<varlistentry>
167179
<term><replaceable class="PARAMETER">table_name</replaceable></term>
168180
<listitem>

‎src/backend/bootstrap/bootparse.y‎

Lines changed: 3 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -9,7 +9,7 @@
99
*
1010
*
1111
* IDENTIFICATION
12-
* $PostgreSQL: pgsql/src/backend/bootstrap/bootparse.y,v 1.105 2010/02/07 20:48:09 tgl Exp $
12+
* $PostgreSQL: pgsql/src/backend/bootstrap/bootparse.y,v 1.106 2010/07/25 23:21:21 rhaas Exp $
1313
*
1414
*-------------------------------------------------------------------------
1515
*/
@@ -245,7 +245,8 @@ Boot_CreateStmt:
245245
ONCOMMIT_NOOP,
246246
(Datum)0,
247247
false,
248-
true);
248+
true,
249+
false);
249250
elog(DEBUG4,"relation created with oid %u", id);
250251
}
251252
do_end();

‎src/backend/catalog/heap.c‎

Lines changed: 22 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/catalog/heap.c,v 1.373 2010/04/05 01:09:52 tgl Exp $
11+
* $PostgreSQL: pgsql/src/backend/catalog/heap.c,v 1.374 2010/07/25 23:21:21 rhaas Exp $
1212
*
1313
*
1414
* INTERFACE ROUTINES
@@ -903,11 +903,13 @@ heap_create_with_catalog(const char *relname,
903903
OnCommitActiononcommit,
904904
Datumreloptions,
905905
booluse_user_acl,
906-
boolallow_system_table_mods)
906+
boolallow_system_table_mods,
907+
boolif_not_exists)
907908
{
908909
Relationpg_class_desc;
909910
Relationnew_rel_desc;
910911
Acl*relacl;
912+
Oidexisting_relid;
911913
Oidold_type_oid;
912914
Oidnew_type_oid;
913915
Oidnew_array_oid=InvalidOid;
@@ -921,10 +923,27 @@ heap_create_with_catalog(const char *relname,
921923

922924
CheckAttributeNamesTypes(tupdesc,relkind,allow_system_table_mods);
923925

924-
if (get_relname_relid(relname,relnamespace))
926+
/*
927+
* If the relation already exists, it's an error, unless the user specifies
928+
* "IF NOT EXISTS". In that case, we just print a notice and do nothing
929+
* further.
930+
*/
931+
existing_relid=get_relname_relid(relname,relnamespace);
932+
if (existing_relid!=InvalidOid)
933+
{
934+
if (if_not_exists)
935+
{
936+
ereport(NOTICE,
937+
(errcode(ERRCODE_DUPLICATE_TABLE),
938+
errmsg("relation \"%s\" already exists, skipping",
939+
relname)));
940+
heap_close(pg_class_desc,RowExclusiveLock);
941+
returnInvalidOid;
942+
}
925943
ereport(ERROR,
926944
(errcode(ERRCODE_DUPLICATE_TABLE),
927945
errmsg("relation \"%s\" already exists",relname)));
946+
}
928947

929948
/*
930949
* Since we are going to create a rowtype as well, also check for

‎src/backend/catalog/toasting.c‎

Lines changed: 4 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
* Portions Copyright (c) 1994, Regents of the University of California
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/catalog/toasting.c,v 1.32 2010/02/26 02:00:37 momjian Exp $
11+
* $PostgreSQL: pgsql/src/backend/catalog/toasting.c,v 1.33 2010/07/25 23:21:21 rhaas Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -223,7 +223,9 @@ create_toast_table(Relation rel, Oid toastOid, Oid toastIndexOid, Datum reloptio
223223
ONCOMMIT_NOOP,
224224
reloptions,
225225
false,
226-
true);
226+
true,
227+
false);
228+
Assert(toast_relid!=InvalidOid);
227229

228230
/* make the toast relation visible, else index creation will fail */
229231
CommandCounterIncrement();

‎src/backend/commands/cluster.c‎

Lines changed: 4 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -11,7 +11,7 @@
1111
*
1212
*
1313
* IDENTIFICATION
14-
* $PostgreSQL: pgsql/src/backend/commands/cluster.c,v 1.203 2010/04/28 16:10:41 heikki Exp $
14+
* $PostgreSQL: pgsql/src/backend/commands/cluster.c,v 1.204 2010/07/25 23:21:21 rhaas Exp $
1515
*
1616
*-------------------------------------------------------------------------
1717
*/
@@ -687,7 +687,9 @@ make_new_heap(Oid OIDOldHeap, Oid NewTableSpace)
687687
ONCOMMIT_NOOP,
688688
reloptions,
689689
false,
690-
true);
690+
true,
691+
false);
692+
Assert(OIDNewHeap!=InvalidOid);
691693

692694
ReleaseSysCache(tuple);
693695

‎src/backend/commands/sequence.c‎

Lines changed: 3 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/commands/sequence.c,v 1.168 2010/02/2021:24:02 tgl Exp $
11+
* $PostgreSQL: pgsql/src/backend/commands/sequence.c,v 1.169 2010/07/25 23:21:21 rhaas Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -203,8 +203,10 @@ DefineSequence(CreateSeqStmt *seq)
203203
stmt->options=list_make1(defWithOids(false));
204204
stmt->oncommit=ONCOMMIT_NOOP;
205205
stmt->tablespacename=NULL;
206+
stmt->if_not_exists= false;
206207

207208
seqoid=DefineRelation(stmt,RELKIND_SEQUENCE);
209+
Assert(seqoid!=InvalidOid);
208210

209211
rel=heap_open(seqoid,AccessExclusiveLock);
210212
tupDesc=RelationGetDescr(rel);

‎src/backend/commands/tablecmds.c‎

Lines changed: 12 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.333 2010/07/23 20:04:18 petere Exp $
11+
* $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.334 2010/07/25 23:21:21 rhaas Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -548,8 +548,18 @@ DefineRelation(CreateStmt *stmt, char relkind)
548548
stmt->oncommit,
549549
reloptions,
550550
true,
551-
allowSystemTableMods);
551+
allowSystemTableMods,
552+
stmt->if_not_exists);
552553

554+
/*
555+
* If heap_create_with_catalog returns InvalidOid, it means that the user
556+
* specified "IF NOT EXISTS" and the relation already exists. In that
557+
* case we do nothing further.
558+
*/
559+
if (relationId==InvalidOid)
560+
returnInvalidOid;
561+
562+
/* Store inheritance information for new rel. */
553563
StoreCatalogInheritance(relationId,inheritOids);
554564

555565
/*

‎src/backend/commands/typecmds.c‎

Lines changed: 6 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/commands/typecmds.c,v 1.148 2010/02/26 02:00:40 momjian Exp $
11+
* $PostgreSQL: pgsql/src/backend/commands/typecmds.c,v 1.149 2010/07/25 23:21:21 rhaas Exp $
1212
*
1313
* DESCRIPTION
1414
* The "DefineFoo" routines take the parse tree and pick out the
@@ -1506,6 +1506,7 @@ DefineCompositeType(const RangeVar *typevar, List *coldeflist)
15061506
CreateStmt*createStmt=makeNode(CreateStmt);
15071507
Oidold_type_oid;
15081508
OidtypeNamespace;
1509+
Oidrelid;
15091510

15101511
if (coldeflist==NIL)
15111512
ereport(ERROR,
@@ -1523,6 +1524,7 @@ DefineCompositeType(const RangeVar *typevar, List *coldeflist)
15231524
createStmt->options=list_make1(defWithOids(false));
15241525
createStmt->oncommit=ONCOMMIT_NOOP;
15251526
createStmt->tablespacename=NULL;
1527+
createStmt->if_not_exists= false;
15261528

15271529
/*
15281530
* Check for collision with an existing type name. If there is one and
@@ -1546,7 +1548,9 @@ DefineCompositeType(const RangeVar *typevar, List *coldeflist)
15461548
/*
15471549
* Finally create the relation. This also creates the type.
15481550
*/
1549-
returnDefineRelation(createStmt,RELKIND_COMPOSITE_TYPE);
1551+
relid=DefineRelation(createStmt,RELKIND_COMPOSITE_TYPE);
1552+
Assert(relid!=InvalidOid);
1553+
returnrelid;
15501554
}
15511555

15521556
/*

‎src/backend/commands/view.c‎

Lines changed: 7 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/commands/view.c,v 1.120 2010/01/02 16:57:40 momjian Exp $
11+
* $PostgreSQL: pgsql/src/backend/commands/view.c,v 1.121 2010/07/25 23:21:21 rhaas Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -222,6 +222,8 @@ DefineVirtualRelation(const RangeVar *relation, List *tlist, bool replace)
222222
}
223223
else
224224
{
225+
Oidrelid;
226+
225227
/*
226228
* now set the parameters for keys/inheritance etc. All of these are
227229
* uninteresting for views...
@@ -233,13 +235,16 @@ DefineVirtualRelation(const RangeVar *relation, List *tlist, bool replace)
233235
createStmt->options=list_make1(defWithOids(false));
234236
createStmt->oncommit=ONCOMMIT_NOOP;
235237
createStmt->tablespacename=NULL;
238+
createStmt->if_not_exists= false;
236239

237240
/*
238241
* finally create the relation (this will error out if there's an
239242
* existing view, so we don't need more code to complain if "replace"
240243
* is false).
241244
*/
242-
returnDefineRelation(createStmt,RELKIND_VIEW);
245+
relid=DefineRelation(createStmt,RELKIND_VIEW);
246+
Assert(relid!=InvalidOid);
247+
returnrelid;
243248
}
244249
}
245250

‎src/backend/executor/execMain.c‎

Lines changed: 4 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -26,7 +26,7 @@
2626
*
2727
*
2828
* IDENTIFICATION
29-
* $PostgreSQL: pgsql/src/backend/executor/execMain.c,v 1.352 2010/07/22 00:47:52 rhaas Exp $
29+
* $PostgreSQL: pgsql/src/backend/executor/execMain.c,v 1.353 2010/07/25 23:21:21 rhaas Exp $
3030
*
3131
*-------------------------------------------------------------------------
3232
*/
@@ -2190,7 +2190,9 @@ OpenIntoRel(QueryDesc *queryDesc)
21902190
into->onCommit,
21912191
reloptions,
21922192
true,
2193-
allowSystemTableMods);
2193+
allowSystemTableMods,
2194+
false);
2195+
Assert(intoRelationId!=InvalidOid);
21942196

21952197
FreeTupleDesc(tupdesc);
21962198

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