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Commitf14fdad

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committed
Make ALTER TABLE RENAME update foreign-key trigger arguments correctly.
Brent Verner, with review and kibitzing from Tom Lane.
1 parent8bfc437 commitf14fdad

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3 files changed

+304
-13
lines changed

3 files changed

+304
-13
lines changed

‎src/backend/commands/rename.c‎

Lines changed: 283 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -8,33 +8,51 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $Header: /cvsroot/pgsql/src/backend/commands/Attic/rename.c,v 1.61 2001/11/05 17:46:24 momjian Exp $
11+
* $Header: /cvsroot/pgsql/src/backend/commands/Attic/rename.c,v 1.62 2001/11/12 00:46:36 tgl Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
1515
#include"postgres.h"
1616

1717
#include<errno.h>
1818

19+
#include"access/genam.h"
1920
#include"access/heapam.h"
21+
#include"access/itup.h"
2022
#include"catalog/catname.h"
2123
#include"catalog/pg_index.h"
24+
#include"catalog/pg_trigger.h"
2225
#include"catalog/pg_type.h"
2326
#include"catalog/heap.h"
2427
#include"catalog/indexing.h"
2528
#include"catalog/catalog.h"
2629
#include"commands/rename.h"
30+
#include"commands/trigger.h"
2731
#include"miscadmin.h"
2832
#include"storage/smgr.h"
2933
#include"optimizer/prep.h"
3034
#include"rewrite/rewriteDefine.h"
3135
#include"rewrite/rewriteSupport.h"
3236
#include"utils/acl.h"
37+
#include"utils/builtins.h"
38+
#include"utils/fmgroids.h"
3339
#include"utils/relcache.h"
3440
#include"utils/syscache.h"
3541
#include"utils/temprel.h"
3642

3743

44+
#defineRI_TRIGGER_PK 1/* is a trigger on the PK relation */
45+
#defineRI_TRIGGER_FK 2/* is a trigger on the FK relation */
46+
#defineRI_TRIGGER_NONE 0/* is not an RI trigger function */
47+
48+
staticintri_trigger_type(Oidtgfoid);
49+
staticvoidupdate_ri_trigger_args(Oidrelid,
50+
constchar*oldname,
51+
constchar*newname,
52+
boolfk_scan,
53+
boolupdate_relname);
54+
55+
3856
/*
3957
*renameatt- changes the name of a attribute in a relation
4058
*
@@ -226,6 +244,22 @@ renameatt(char *relname,
226244
freeList(indexoidlist);
227245

228246
heap_close(attrelation,RowExclusiveLock);
247+
248+
/*
249+
* Update att name in any RI triggers associated with the relation.
250+
*/
251+
if (targetrelation->rd_rel->reltriggers>0)
252+
{
253+
/* update tgargs column reference where att is primary key */
254+
update_ri_trigger_args(RelationGetRelid(targetrelation),
255+
oldattname,newattname,
256+
false, false);
257+
/* update tgargs column reference where att is foreign key */
258+
update_ri_trigger_args(RelationGetRelid(targetrelation),
259+
oldattname,newattname,
260+
true, false);
261+
}
262+
229263
heap_close(targetrelation,NoLock);/* close rel but keep lock! */
230264
}
231265

@@ -240,6 +274,7 @@ renamerel(const char *oldrelname, const char *newrelname)
240274
HeapTuplereltup;
241275
Oidreloid;
242276
charrelkind;
277+
boolrelhastriggers;
243278
Relationirelations[Num_pg_class_indices];
244279

245280
if (!allowSystemTableMods&&IsSystemRelationName(oldrelname))
@@ -265,6 +300,7 @@ renamerel(const char *oldrelname, const char *newrelname)
265300

266301
reloid=RelationGetRelid(targetrelation);
267302
relkind=targetrelation->rd_rel->relkind;
303+
relhastriggers= (targetrelation->rd_rel->reltriggers>0);
268304

269305
/*
270306
* Close rel, but keep exclusive lock!
@@ -331,4 +367,250 @@ renamerel(const char *oldrelname, const char *newrelname)
331367
newrulename=MakeRetrieveViewRuleName(newrelname);
332368
RenameRewriteRule(oldrulename,newrulename);
333369
}
370+
371+
/*
372+
* Update rel name in any RI triggers associated with the relation.
373+
*/
374+
if (relhastriggers)
375+
{
376+
/* update tgargs where relname is primary key */
377+
update_ri_trigger_args(reloid,
378+
oldrelname,newrelname,
379+
false, true);
380+
/* update tgargs where relname is foreign key */
381+
update_ri_trigger_args(reloid,
382+
oldrelname,newrelname,
383+
true, true);
384+
}
385+
}
386+
387+
/*
388+
* Given a trigger function OID, determine whether it is an RI trigger,
389+
* and if so whether it is attached to PK or FK relation.
390+
*
391+
* XXX this probably doesn't belong here; should be exported by
392+
* ri_triggers.c
393+
*/
394+
staticint
395+
ri_trigger_type(Oidtgfoid)
396+
{
397+
switch (tgfoid)
398+
{
399+
caseF_RI_FKEY_CASCADE_DEL:
400+
caseF_RI_FKEY_CASCADE_UPD:
401+
caseF_RI_FKEY_RESTRICT_DEL:
402+
caseF_RI_FKEY_RESTRICT_UPD:
403+
caseF_RI_FKEY_SETNULL_DEL:
404+
caseF_RI_FKEY_SETNULL_UPD:
405+
caseF_RI_FKEY_SETDEFAULT_DEL:
406+
caseF_RI_FKEY_SETDEFAULT_UPD:
407+
caseF_RI_FKEY_NOACTION_DEL:
408+
caseF_RI_FKEY_NOACTION_UPD:
409+
returnRI_TRIGGER_PK;
410+
411+
caseF_RI_FKEY_CHECK_INS:
412+
caseF_RI_FKEY_CHECK_UPD:
413+
returnRI_TRIGGER_FK;
414+
}
415+
416+
returnRI_TRIGGER_NONE;
417+
}
418+
419+
/*
420+
* Scan pg_trigger for RI triggers that are on the specified relation
421+
* (if fk_scan is false) or have it as the tgconstrrel (if fk_scan
422+
* is true). Update RI trigger args fields matching oldname to contain
423+
* newname instead. If update_relname is true, examine the relname
424+
* fields; otherwise examine the attname fields.
425+
*/
426+
staticvoid
427+
update_ri_trigger_args(Oidrelid,
428+
constchar*oldname,
429+
constchar*newname,
430+
boolfk_scan,
431+
boolupdate_relname)
432+
{
433+
Relationtgrel;
434+
Relationirel;
435+
ScanKeyDataskey[1];
436+
IndexScanDescidxtgscan;
437+
RetrieveIndexResultidxres;
438+
Datumvalues[Natts_pg_trigger];
439+
charnulls[Natts_pg_trigger];
440+
charreplaces[Natts_pg_trigger];
441+
442+
tgrel=heap_openr(TriggerRelationName,RowExclusiveLock);
443+
if (fk_scan)
444+
irel=index_openr(TriggerConstrRelidIndex);
445+
else
446+
irel=index_openr(TriggerRelidIndex);
447+
448+
ScanKeyEntryInitialize(&skey[0],0x0,
449+
1,/* always column 1 of index */
450+
F_OIDEQ,
451+
ObjectIdGetDatum(relid));
452+
idxtgscan=index_beginscan(irel, false,1,skey);
453+
454+
while ((idxres=index_getnext(idxtgscan,ForwardScanDirection))!=NULL)
455+
{
456+
HeapTupleDatatupledata;
457+
Bufferbuffer;
458+
HeapTupletuple;
459+
Form_pg_triggerpg_trigger;
460+
bytea*val;
461+
bytea*newtgargs;
462+
boolisnull;
463+
inttg_type;
464+
boolexamine_pk;
465+
boolchanged;
466+
inttgnargs;
467+
inti;
468+
intnewlen;
469+
constchar*arga[RI_MAX_ARGUMENTS];
470+
constchar*argp;
471+
472+
tupledata.t_self=idxres->heap_iptr;
473+
heap_fetch(tgrel,SnapshotNow,&tupledata,&buffer,idxtgscan);
474+
pfree(idxres);
475+
if (!tupledata.t_data)
476+
continue;
477+
tuple=&tupledata;
478+
pg_trigger= (Form_pg_trigger)GETSTRUCT(tuple);
479+
tg_type=ri_trigger_type(pg_trigger->tgfoid);
480+
if (tg_type==RI_TRIGGER_NONE)
481+
{
482+
/* Not an RI trigger, forget it */
483+
ReleaseBuffer(buffer);
484+
continue;
485+
}
486+
487+
/*
488+
* It is an RI trigger, so parse the tgargs bytea.
489+
*
490+
* NB: we assume the field will never be compressed or moved
491+
* out of line; so does trigger.c ...
492+
*/
493+
tgnargs=pg_trigger->tgnargs;
494+
val= (bytea*)fastgetattr(tuple,
495+
Anum_pg_trigger_tgargs,
496+
tgrel->rd_att,&isnull);
497+
if (isnull||tgnargs<RI_FIRST_ATTNAME_ARGNO||
498+
tgnargs>RI_MAX_ARGUMENTS)
499+
{
500+
/* This probably shouldn't happen, but ignore busted triggers */
501+
ReleaseBuffer(buffer);
502+
continue;
503+
}
504+
argp= (constchar*)VARDATA(val);
505+
for (i=0;i<tgnargs;i++)
506+
{
507+
arga[i]=argp;
508+
argp+=strlen(argp)+1;
509+
}
510+
511+
/*
512+
* Figure out which item(s) to look at. If the trigger is
513+
* primary-key type and attached to my rel, I should look at
514+
* the PK fields; if it is foreign-key type and attached to my
515+
* rel, I should look at the FK fields. But the opposite rule
516+
* holds when examining triggers found by tgconstrrel search.
517+
*/
518+
examine_pk= (tg_type==RI_TRIGGER_PK)== (!fk_scan);
519+
520+
changed= false;
521+
if (update_relname)
522+
{
523+
/* Change the relname if needed */
524+
i=examine_pk ?RI_PK_RELNAME_ARGNO :RI_FK_RELNAME_ARGNO;
525+
if (strcmp(arga[i],oldname)==0)
526+
{
527+
arga[i]=newname;
528+
changed= true;
529+
}
530+
}
531+
else
532+
{
533+
/* Change attname(s) if needed */
534+
i=examine_pk ?RI_FIRST_ATTNAME_ARGNO+RI_KEYPAIR_PK_IDX :
535+
RI_FIRST_ATTNAME_ARGNO+RI_KEYPAIR_FK_IDX;
536+
for (;i<tgnargs;i+=2)
537+
{
538+
if (strcmp(arga[i],oldname)==0)
539+
{
540+
arga[i]=newname;
541+
changed= true;
542+
}
543+
}
544+
}
545+
546+
if (!changed)
547+
{
548+
/* Don't need to update this tuple */
549+
ReleaseBuffer(buffer);
550+
continue;
551+
}
552+
553+
/*
554+
* Construct modified tgargs bytea.
555+
*/
556+
newlen=VARHDRSZ;
557+
for (i=0;i<tgnargs;i++)
558+
newlen+=strlen(arga[i])+1;
559+
newtgargs= (bytea*)palloc(newlen);
560+
VARATT_SIZEP(newtgargs)=newlen;
561+
newlen=VARHDRSZ;
562+
for (i=0;i<tgnargs;i++)
563+
{
564+
strcpy(((char*)newtgargs)+newlen,arga[i]);
565+
newlen+=strlen(arga[i])+1;
566+
}
567+
568+
/*
569+
* Build modified tuple.
570+
*/
571+
for (i=0;i<Natts_pg_trigger;i++)
572+
{
573+
values[i]= (Datum)0;
574+
replaces[i]=' ';
575+
nulls[i]=' ';
576+
}
577+
values[Anum_pg_trigger_tgargs-1]=PointerGetDatum(newtgargs);
578+
replaces[Anum_pg_trigger_tgargs-1]='r';
579+
580+
tuple=heap_modifytuple(tuple,tgrel,values,nulls,replaces);
581+
582+
/*
583+
* Now we can release hold on original tuple.
584+
*/
585+
ReleaseBuffer(buffer);
586+
587+
/*
588+
* Update pg_trigger and its indexes
589+
*/
590+
simple_heap_update(tgrel,&tuple->t_self,tuple);
591+
592+
{
593+
Relationirelations[Num_pg_attr_indices];
594+
595+
CatalogOpenIndices(Num_pg_trigger_indices,Name_pg_trigger_indices,irelations);
596+
CatalogIndexInsert(irelations,Num_pg_trigger_indices,tgrel,tuple);
597+
CatalogCloseIndices(Num_pg_trigger_indices,irelations);
598+
}
599+
600+
/* free up our scratch memory */
601+
pfree(newtgargs);
602+
heap_freetuple(tuple);
603+
}
604+
605+
index_endscan(idxtgscan);
606+
index_close(irel);
607+
608+
heap_close(tgrel,RowExclusiveLock);
609+
610+
/*
611+
* Increment cmd counter to make updates visible; this is needed
612+
* in case the same tuple has to be updated again by next pass
613+
* (can happen in case of a self-referential FK relationship).
614+
*/
615+
CommandCounterIncrement();
334616
}

‎src/backend/utils/adt/ri_triggers.c‎

Lines changed: 1 addition & 11 deletions
Original file line numberDiff line numberDiff line change
@@ -18,7 +18,7 @@
1818
* Portions Copyright (c) 2000-2001, PostgreSQL Global Development Group
1919
* Copyright 1999 Jan Wieck
2020
*
21-
* $Header: /cvsroot/pgsql/src/backend/utils/adt/ri_triggers.c,v 1.29 2001/10/25 05:49:45 momjian Exp $
21+
* $Header: /cvsroot/pgsql/src/backend/utils/adt/ri_triggers.c,v 1.30 2001/11/12 00:46:36 tgl Exp $
2222
*
2323
* ----------
2424
*/
@@ -43,16 +43,6 @@
4343
* Local definitions
4444
* ----------
4545
*/
46-
#defineRI_CONSTRAINT_NAME_ARGNO0
47-
#defineRI_FK_RELNAME_ARGNO1
48-
#defineRI_PK_RELNAME_ARGNO2
49-
#defineRI_MATCH_TYPE_ARGNO3
50-
#defineRI_FIRST_ATTNAME_ARGNO4
51-
52-
#defineRI_MAX_NUMKEYS16
53-
#defineRI_MAX_ARGUMENTS(RI_FIRST_ATTNAME_ARGNO + (RI_MAX_NUMKEYS * 2))
54-
#defineRI_KEYPAIR_FK_IDX0
55-
#defineRI_KEYPAIR_PK_IDX1
5646

5747
#defineRI_INIT_QUERYHASHSIZE128
5848
#defineRI_INIT_OPREQHASHSIZE128

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