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Code Activity

Added ALTER TABLE ... ADD CONSTRAINT (provided by Stephan Szabo).

Browse Source 
Added constraint dumping capability to pg_dump (also from Stephan)

Fixed DROP TABLE -> RelationBuildTriggers: 2 record(s) not found for rel
error.

Fixed little error in gram.y I made the last days.

Jan
This commit is contained in:
Jan Wieck
2000-02-04 18:49:34 +00:00
parent 74d53d7838
commit ddd596d386
5 changed files with 450 additions and 28 deletions
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95
src/backend/commands/command.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/commands/Attic/command.c,v 1.67 2000/01/29 16:58:34 petere Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/Attic/command.c,v 1.68 2000/02/04 18:49:31 wieck Exp $
*
* NOTES
* The PortalExecutorHeapMemory crap needs to be eliminated
@ -34,6 +34,7 @@
#include "commands/rename.h"
#include "executor/execdefs.h"
#include "executor/executor.h"
#include "executor/spi.h"
#include "catalog/heap.h"
#include "miscadmin.h"
#include "optimizer/prep.h"
@ -41,7 +42,7 @@
#include "utils/builtins.h"
#include "utils/syscache.h"
#include "utils/temprel.h"
#include "commands/trigger.h"
/* ----------------
* PortalExecutorHeapMemory stuff
@ -688,7 +689,95 @@ void
AlterTableAddConstraint(const char *relationName,
bool inh, Node *newConstraint)
{
elog(ERROR, "ALTER TABLE / ADD CONSTRAINT is not implemented");
if (newConstraint == NULL)
elog(ERROR, "ALTER TABLE / ADD CONSTRAINT passed invalid constraint.");
switch (nodeTag(newConstraint))
{
case T_Constraint:
elog(ERROR, "ALTER TABLE / ADD CONSTRAINT is not implemented");
case T_FkConstraint:
{
FkConstraint *fkconstraint=(FkConstraint *)newConstraint;
Relation rel, classrel;
HeapScanDesc scan;
HeapTuple tuple;
Trigger trig;
List *list;
int count;
/*
* Grab an exclusive lock on the pk table, so that someone
* doesn't delete rows out from under us.
*/
rel = heap_openr(fkconstraint->pktable_name, AccessExclusiveLock);
heap_close(rel, NoLock);
/*
* Grab an exclusive lock on the fk table, and then scan through
* each tuple, calling the RI_FKey_Match_Ins (insert trigger)
* as if that tuple had just been inserted. If any of those
* fail, it should elog(ERROR) and that's that.
*/
rel = heap_openr(relationName, AccessExclusiveLock);
trig.tgoid = 0;
trig.tgname = "<unknown>";
trig.tgfoid = 0;
trig.tgtype = 0;
trig.tgenabled = TRUE;
trig.tgisconstraint = TRUE;
trig.tginitdeferred = FALSE;
trig.tgdeferrable = FALSE;
trig.tgargs = (char **)palloc(
sizeof(char *) * (4 + length(fkconstraint->fk_attrs)
+ length(fkconstraint->pk_attrs)));
trig.tgargs[0] = "<unnamed>";
trig.tgargs[1] = (char *)relationName;
trig.tgargs[2] = fkconstraint->pktable_name;
trig.tgargs[3] = fkconstraint->match_type;
count = 4;
foreach (list, fkconstraint->fk_attrs)
{
Ident *fk_at = lfirst(list);
trig.tgargs[count++] = fk_at->name;
}
foreach (list, fkconstraint->pk_attrs)
{
Ident *pk_at = lfirst(list);
trig.tgargs[count++] = pk_at->name;
}
trig.tgnargs = count;
scan = heap_beginscan(rel, false, SnapshotNow, 0, NULL);
AssertState(scan!=NULL);
while (HeapTupleIsValid(tuple = heap_getnext(scan, 0)))
{
TriggerData newtrigdata;
newtrigdata.tg_event = TRIGGER_EVENT_INSERT | TRIGGER_EVENT_ROW;
newtrigdata.tg_relation = rel;
newtrigdata.tg_trigtuple = tuple;
newtrigdata.tg_newtuple = NULL;
newtrigdata.tg_trigger = &trig;
CurrentTriggerData = &newtrigdata;
RI_FKey_check_ins(NULL);
/* Make a call to the check function */
}
heap_endscan(scan);
heap_close(rel, NoLock); /* close rel but keep lock! */
pfree(trig.tgargs);
}
break;
default:
elog(ERROR, "ALTER TABLE / ADD CONSTRAINT unable to determine type of constraint passed");
}
}