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Commit3a96b6c

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Attached is a patch for ALTER TRIGGER RENAME per the above thread. I
left a stub for a future "ALTER RULE RENAME" but did not write that oneyet. Bruce, if you want to add my name for for that I'll take it and doit later.Joe Conway
1 parentfbc4b71 commit3a96b6c

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7 files changed

+182
-31
lines changed

7 files changed

+182
-31
lines changed

‎src/backend/commands/tablecmds.c

Lines changed: 118 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $Header: /cvsroot/pgsql/src/backend/commands/tablecmds.c,v 1.8 2002/04/24 02:38:58 momjian Exp $
11+
* $Header: /cvsroot/pgsql/src/backend/commands/tablecmds.c,v 1.9 2002/04/24 02:48:54 momjian Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -2846,6 +2846,123 @@ renamerel(Oid relid, const char *newrelname)
28462846
relation_close(targetrelation,NoLock);
28472847
}
28482848

2849+
/*
2850+
*renametrig- changes the name of a trigger on a relation
2851+
*
2852+
*trigger name is changed in trigger catalog.
2853+
*No record of the previous name is kept.
2854+
*
2855+
*get proper relrelation from relation catalog (if not arg)
2856+
*scan trigger catalog
2857+
*for name conflict (within rel)
2858+
*for original trigger (if not arg)
2859+
*modify tgname in trigger tuple
2860+
*insert modified trigger in trigger catalog
2861+
*delete original trigger from trigger catalog
2862+
*/
2863+
externvoidrenametrig(Oidrelid,
2864+
constchar*oldname,
2865+
constchar*newname)
2866+
{
2867+
Relationtargetrel;
2868+
Relationtgrel;
2869+
HeapTupletuple;
2870+
SysScanDesctgscan;
2871+
ScanKeyDatakey;
2872+
boolfound= FALSE;
2873+
Relationidescs[Num_pg_trigger_indices];
2874+
2875+
/*
2876+
* Grab an exclusive lock on the target table, which we will NOT
2877+
* release until end of transaction.
2878+
*/
2879+
targetrel=heap_open(relid,AccessExclusiveLock);
2880+
2881+
/*
2882+
* Scan pg_trigger twice for existing triggers on relation. We do this in
2883+
* order to ensure a trigger does not exist with newname (The unique index
2884+
* on tgrelid/tgname would complain anyway) and to ensure a trigger does
2885+
* exist with oldname.
2886+
*
2887+
* NOTE that this is cool only because we have AccessExclusiveLock on the
2888+
* relation, so the trigger set won't be changing underneath us.
2889+
*/
2890+
tgrel=heap_openr(TriggerRelationName,RowExclusiveLock);
2891+
2892+
/*
2893+
* First pass -- look for name conflict
2894+
*/
2895+
ScanKeyEntryInitialize(&key,0,
2896+
Anum_pg_trigger_tgrelid,
2897+
F_OIDEQ,
2898+
ObjectIdGetDatum(relid));
2899+
tgscan=systable_beginscan(tgrel,TriggerRelidNameIndex, true,
2900+
SnapshotNow,1,&key);
2901+
while (HeapTupleIsValid(tuple=systable_getnext(tgscan)))
2902+
{
2903+
Form_pg_triggerpg_trigger= (Form_pg_trigger)GETSTRUCT(tuple);
2904+
2905+
if (namestrcmp(&(pg_trigger->tgname),newname)==0)
2906+
elog(ERROR,"renametrig: trigger %s already defined on relation %s",
2907+
newname,RelationGetRelationName(targetrel));
2908+
}
2909+
systable_endscan(tgscan);
2910+
2911+
/*
2912+
* Second pass -- look for trigger existing with oldname and update
2913+
*/
2914+
ScanKeyEntryInitialize(&key,0,
2915+
Anum_pg_trigger_tgrelid,
2916+
F_OIDEQ,
2917+
ObjectIdGetDatum(relid));
2918+
tgscan=systable_beginscan(tgrel,TriggerRelidNameIndex, true,
2919+
SnapshotNow,1,&key);
2920+
while (HeapTupleIsValid(tuple=systable_getnext(tgscan)))
2921+
{
2922+
Form_pg_triggerpg_trigger= (Form_pg_trigger)GETSTRUCT(tuple);
2923+
2924+
if (namestrcmp(&(pg_trigger->tgname),oldname)==0)
2925+
{
2926+
/*
2927+
* Update pg_trigger tuple with new tgname.
2928+
* (Scribbling on tuple is OK because it's a copy...)
2929+
*/
2930+
namestrcpy(&(pg_trigger->tgname),newname);
2931+
simple_heap_update(tgrel,&tuple->t_self,tuple);
2932+
2933+
/*
2934+
* keep system catalog indices current
2935+
*/
2936+
CatalogOpenIndices(Num_pg_trigger_indices,Name_pg_trigger_indices,idescs);
2937+
CatalogIndexInsert(idescs,Num_pg_trigger_indices,tgrel,tuple);
2938+
CatalogCloseIndices(Num_pg_trigger_indices,idescs);
2939+
2940+
/*
2941+
* Invalidate relation's relcache entry so that other
2942+
* backends (and this one too!) are sent SI message to make them
2943+
* rebuild relcache entries.
2944+
*/
2945+
CacheInvalidateRelcache(relid);
2946+
2947+
found= TRUE;
2948+
break;
2949+
}
2950+
}
2951+
systable_endscan(tgscan);
2952+
2953+
heap_close(tgrel,RowExclusiveLock);
2954+
2955+
if (!found)
2956+
elog(ERROR,"renametrig: trigger %s not defined on relation %s",
2957+
oldname,RelationGetRelationName(targetrel));
2958+
2959+
/*
2960+
* Close rel, but keep exclusive lock!
2961+
*/
2962+
heap_close(targetrel,NoLock);
2963+
}
2964+
2965+
28492966
/*
28502967
* Given a trigger function OID, determine whether it is an RI trigger,
28512968
* and if so whether it is attached to PK or FK relation.

‎src/backend/nodes/copyfuncs.c

Lines changed: 4 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -15,7 +15,7 @@
1515
* Portions Copyright (c) 1994, Regents of the University of California
1616
*
1717
* IDENTIFICATION
18-
* $Header: /cvsroot/pgsql/src/backend/nodes/copyfuncs.c,v 1.180 2002/04/18 20:01:09 tgl Exp $
18+
* $Header: /cvsroot/pgsql/src/backend/nodes/copyfuncs.c,v 1.181 2002/04/24 02:48:54 momjian Exp $
1919
*
2020
*-------------------------------------------------------------------------
2121
*/
@@ -2137,10 +2137,11 @@ _copyRenameStmt(RenameStmt *from)
21372137
RenameStmt*newnode=makeNode(RenameStmt);
21382138

21392139
Node_Copy(from,newnode,relation);
2140-
if (from->column)
2141-
newnode->column=pstrdup(from->column);
2140+
if (from->oldname)
2141+
newnode->oldname=pstrdup(from->oldname);
21422142
if (from->newname)
21432143
newnode->newname=pstrdup(from->newname);
2144+
newnode->renameType=from->renameType;
21442145

21452146
returnnewnode;
21462147
}

‎src/backend/nodes/equalfuncs.c

Lines changed: 4 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -20,7 +20,7 @@
2020
* Portions Copyright (c) 1994, Regents of the University of California
2121
*
2222
* IDENTIFICATION
23-
* $Header: /cvsroot/pgsql/src/backend/nodes/equalfuncs.c,v 1.128 2002/04/18 20:01:09 tgl Exp $
23+
* $Header: /cvsroot/pgsql/src/backend/nodes/equalfuncs.c,v 1.129 2002/04/24 02:48:54 momjian Exp $
2424
*
2525
*-------------------------------------------------------------------------
2626
*/
@@ -983,10 +983,12 @@ _equalRenameStmt(RenameStmt *a, RenameStmt *b)
983983
{
984984
if (!equal(a->relation,b->relation))
985985
return false;
986-
if (!equalstr(a->column,b->column))
986+
if (!equalstr(a->oldname,b->oldname))
987987
return false;
988988
if (!equalstr(a->newname,b->newname))
989989
return false;
990+
if (a->renameType!=b->renameType)
991+
return false;
990992

991993
return true;
992994
}

‎src/backend/parser/gram.y

Lines changed: 15 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -11,7 +11,7 @@
1111
*
1212
*
1313
* IDENTIFICATION
14-
* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.309 2002/04/21 21:53:23 thomas Exp $
14+
* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.310 2002/04/24 02:48:54 momjian Exp $
1515
*
1616
* HISTORY
1717
* AUTHORDATEMAJOR EVENT
@@ -2919,8 +2919,21 @@ RenameStmt: ALTER TABLE relation_expr RENAME opt_column opt_name TO name
29192919
{
29202920
RenameStmt *n = makeNode(RenameStmt);
29212921
n->relation =$3;
2922-
n->column =$6;
2922+
n->oldname =$6;
29232923
n->newname =$8;
2924+
if ($6 ==NULL)
2925+
n->renameType = RENAME_TABLE;
2926+
else
2927+
n->renameType = RENAME_COLUMN;
2928+
$$ = (Node *)n;
2929+
}
2930+
|ALTERTRIGGERnameONrelation_exprRENAMETOname
2931+
{
2932+
RenameStmt *n = makeNode(RenameStmt);
2933+
n->relation =$5;
2934+
n->oldname =$3;
2935+
n->newname =$8;
2936+
n->renameType = RENAME_TRIGGER;
29242937
$$ = (Node *)n;
29252938
}
29262939
;

‎src/backend/tcop/utility.c

Lines changed: 23 additions & 16 deletions
Original file line numberDiff line numberDiff line change
@@ -10,7 +10,7 @@
1010
*
1111
*
1212
* IDENTIFICATION
13-
* $Header: /cvsroot/pgsql/src/backend/tcop/utility.c,v 1.150 2002/04/18 20:01:09 tgl Exp $
13+
* $Header: /cvsroot/pgsql/src/backend/tcop/utility.c,v 1.151 2002/04/24 02:48:55 momjian Exp $
1414
*
1515
*-------------------------------------------------------------------------
1616
*/
@@ -377,23 +377,30 @@ ProcessUtility(Node *parsetree,
377377

378378
CheckOwnership(stmt->relation, true);
379379

380-
if (stmt->column==NULL)
380+
switch (stmt->renameType)
381381
{
382-
/*
383-
* rename relation
384-
*/
385-
renamerel(RangeVarGetRelid(stmt->relation, false),
386-
stmt->newname);
387-
}
388-
else
389-
{
390-
/*
391-
* rename attribute
392-
*/
393-
renameatt(RangeVarGetRelid(stmt->relation, false),
394-
stmt->column,/* old att name */
382+
caseRENAME_TABLE:
383+
renamerel(RangeVarGetRelid(stmt->relation, false),
384+
stmt->newname);
385+
break;
386+
caseRENAME_COLUMN:
387+
renameatt(RangeVarGetRelid(stmt->relation, false),
388+
stmt->oldname,/* old att name */
395389
stmt->newname,/* new att name */
396-
interpretInhOption(stmt->relation->inhOpt));/* recursive? */
390+
interpretInhOption(stmt->relation->inhOpt));/* recursive? */
391+
break;
392+
caseRENAME_TRIGGER:
393+
renametrig(RangeVarGetRelid(stmt->relation, false),
394+
stmt->oldname,/* old att name */
395+
stmt->newname);/* new att name */
396+
break;
397+
caseRENAME_RULE:
398+
elog(ERROR,"ProcessUtility: Invalid target for RENAME: %d",
399+
stmt->renameType);
400+
break;
401+
default:
402+
elog(ERROR,"ProcessUtility: Invalid target for RENAME: %d",
403+
stmt->renameType);
397404
}
398405
}
399406
break;

‎src/include/commands/tablecmds.h

Lines changed: 6 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -7,14 +7,15 @@
77
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
88
* Portions Copyright (c) 1994, Regents of the University of California
99
*
10-
* $Id: tablecmds.h,v 1.1 2002/04/15 05:22:04 tgl Exp $
10+
* $Id: tablecmds.h,v 1.2 2002/04/24 02:48:55 momjian Exp $
1111
*
1212
*-------------------------------------------------------------------------
1313
*/
1414
#ifndefTABLECMDS_H
1515
#defineTABLECMDS_H
1616

1717
#include"nodes/parsenodes.h"
18+
#include"utils/inval.h"
1819

1920
externvoidAlterTableAddColumn(Oidmyrelid,boolinherits,
2021
ColumnDef*colDef);
@@ -60,4 +61,8 @@ extern void renameatt(Oid relid,
6061
externvoidrenamerel(Oidrelid,
6162
constchar*newrelname);
6263

64+
externvoidrenametrig(Oidrelid,
65+
constchar*oldname,
66+
constchar*newname);
67+
6368
#endif/* TABLECMDS_H */

‎src/include/nodes/parsenodes.h

Lines changed: 12 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
88
* Portions Copyright (c) 1994, Regents of the University of California
99
*
10-
* $Id: parsenodes.h,v 1.173 2002/04/21 00:26:43 tgl Exp $
10+
* $Id: parsenodes.h,v 1.174 2002/04/24 02:48:55 momjian Exp $
1111
*
1212
*-------------------------------------------------------------------------
1313
*/
@@ -1233,17 +1233,23 @@ typedef struct RemoveOperStmt
12331233
}RemoveOperStmt;
12341234

12351235
/* ----------------------
1236-
*AlterTable Rename Statement
1236+
*AlterObject Rename Statement
12371237
* ----------------------
1238+
* Currently supports renaming tables, table columns, and triggers.
1239+
* If renaming a table, oldname is ignored.
12381240
*/
1241+
#defineRENAME_TABLE110
1242+
#defineRENAME_COLUMN111
1243+
#defineRENAME_TRIGGER112
1244+
#defineRENAME_RULE113
1245+
12391246
typedefstructRenameStmt
12401247
{
12411248
NodeTagtype;
1242-
RangeVar*relation;/* relation to be altered */
1243-
char*column;/* if NULL, rename the relation name to
1244-
* the new name. Otherwise, rename this
1245-
* column name. */
1249+
RangeVar*relation;/* owning relation */
1250+
char*oldname;/* name of rule, trigger, etc */
12461251
char*newname;/* the new name */
1252+
intrenameType;/* RENAME_TABLE, RENAME_COLUMN, etc */
12471253
}RenameStmt;
12481254

12491255
/* ----------------------

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