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Changed "triggered data change violation" detection code

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in trigger manager.

Jan
This commit is contained in:
Jan Wieck
2000-01-06 20:47:01 +00:00
parent 88016a564a
commit b7b6d4bf53
6 changed files with 450 additions and 317 deletions
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125
src/backend/utils/adt/ri_triggers.c
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@@ -6,7 +6,7 @@
*
* 1999 Jan Wieck
*
* $Header: /cvsroot/pgsql/src/backend/utils/adt/ri_triggers.c,v 1.11 2000/01/06 16:30:43 wieck Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/ri_triggers.c,v 1.12 2000/01/06 20:46:51 wieck Exp $
*
* ----------
*/
@@ -466,6 +466,34 @@ RI_FKey_check_upd (FmgrInfo *proinfo)
}
/* ----------
* RI_FKey_noaction_del -
*
* This is here only to let the trigger manager trace for
* "triggered data change violation"
* ----------
*/
HeapTuple
RI_FKey_noaction_del (FmgrInfo *proinfo)
{
return NULL;
}
/* ----------
* RI_FKey_noaction_upd -
*
* This is here only to let the trigger manager trace for
* "triggered data change violation"
* ----------
*/
HeapTuple
RI_FKey_noaction_upd (FmgrInfo *proinfo)
{
return NULL;
}
/* ----------
* RI_FKey_cascade_del -
*
@@ -2252,6 +2280,101 @@ RI_FKey_setdefault_upd (FmgrInfo *proinfo)
}
/* ----------
* RI_FKey_keyequal_upd -
*
* Check if we have a key change on update.
*
* This is no real trigger procedure. It is used by the deferred
* trigger queue manager to detect "triggered data change violation".
* ----------
*/
bool
RI_FKey_keyequal_upd (void)
{
TriggerData *trigdata;
int tgnargs;
char **tgargs;
Relation fk_rel;
Relation pk_rel;
HeapTuple new_row;
HeapTuple old_row;
RI_QueryKey qkey;
trigdata = CurrentTriggerData;
CurrentTriggerData = NULL;
/* ----------
* Check for the correct # of call arguments
* ----------
*/
tgnargs = trigdata->tg_trigger->tgnargs;
tgargs = trigdata->tg_trigger->tgargs;
if (tgnargs < 4 || (tgnargs % 2) != 0)
elog(ERROR, "wrong # of arguments in call to RI_FKey_keyequal_upd()");
if (tgnargs > RI_MAX_ARGUMENTS)
elog(ERROR, "too many keys (%d max) in call to RI_FKey_keyequal_upd()",
RI_MAX_NUMKEYS);
/* ----------
* Nothing to do if no column names to compare given
* ----------
*/
if (tgnargs == 4)
return true;
/* ----------
* Get the relation descriptors of the FK and PK tables and
* the new and old tuple.
* ----------
*/
fk_rel = heap_openr(tgargs[RI_FK_RELNAME_ARGNO], NoLock);
pk_rel = trigdata->tg_relation;
new_row = trigdata->tg_newtuple;
old_row = trigdata->tg_trigtuple;
switch (ri_DetermineMatchType(tgargs[RI_MATCH_TYPE_ARGNO]))
{
/* ----------
* MATCH <UNSPECIFIED>
* ----------
*/
case RI_MATCH_TYPE_UNSPECIFIED:
elog(ERROR, "MATCH <unspecified> not implemented yet");
break;
case RI_MATCH_TYPE_FULL:
ri_BuildQueryKeyFull(&qkey, trigdata->tg_trigger->tgoid,
0,
fk_rel, pk_rel,
tgnargs, tgargs);
heap_close(fk_rel, NoLock);
/* ----------
* Return if key's are equal
* ----------
*/
return ri_KeysEqual(pk_rel, old_row, new_row, &qkey,
RI_KEYPAIR_PK_IDX);
/* ----------
* Handle MATCH PARTIAL set null delete.
* ----------
*/
case RI_MATCH_TYPE_PARTIAL:
elog(ERROR, "MATCH PARTIAL not yet supported");
break;
}
/* ----------
* Never reached
* ----------
*/
elog(ERROR, "internal error #9 in ri_triggers.c");
return false;
}