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Create separate ON INSERT and ON UPDATE triggers on tables with foreign

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keys, rather than a single trigger for both events. This should not change
functionality, but it is more consistent: previously, there were trigger
functions for both "check_insert" and "check_update", but the former was
used for both events.

Bump catalog version number (not strictly necessary, but best to be
cautious).
This commit is contained in:
Neil Conway
2005-05-30 06:52:38 +00:00
parent 0832fb74df
commit f99b75b0a0
2 changed files with 69 additions and 47 deletions
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112
src/backend/commands/tablecmds.c
View File

@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.157 2005/05/10 13:16:26 momjian Exp $
* $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.158 2005/05/30 06:52:38 neilc Exp $
*
*-------------------------------------------------------------------------
*/
@@ -4380,6 +4380,69 @@ validateForeignKeyConstraint(FkConstraint *fkconstraint,
pfree(trig.tgargs);
}
static void
CreateFKCheckTrigger(RangeVar *myRel, FkConstraint *fkconstraint,
ObjectAddress *constrobj, ObjectAddress *trigobj,
bool on_insert)
{
CreateTrigStmt *fk_trigger;
ListCell *fk_attr;
ListCell *pk_attr;
fk_trigger = makeNode(CreateTrigStmt);
fk_trigger->trigname = fkconstraint->constr_name;
fk_trigger->relation = myRel;
fk_trigger->before = false;
fk_trigger->row = true;
/* Either ON INSERT or ON UPDATE */
if (on_insert)
{
fk_trigger->funcname = SystemFuncName("RI_FKey_check_ins");
fk_trigger->actions[0] = 'i';
}
else
{
fk_trigger->funcname = SystemFuncName("RI_FKey_check_upd");
fk_trigger->actions[0] = 'u';
}
fk_trigger->actions[1] = '\0';
fk_trigger->isconstraint = true;
fk_trigger->deferrable = fkconstraint->deferrable;
fk_trigger->initdeferred = fkconstraint->initdeferred;
fk_trigger->constrrel = fkconstraint->pktable;
fk_trigger->args = NIL;
fk_trigger->args = lappend(fk_trigger->args,
makeString(fkconstraint->constr_name));
fk_trigger->args = lappend(fk_trigger->args,
makeString(myRel->relname));
fk_trigger->args = lappend(fk_trigger->args,
makeString(fkconstraint->pktable->relname));
fk_trigger->args = lappend(fk_trigger->args,
makeString(fkMatchTypeToString(fkconstraint->fk_matchtype)));
if (list_length(fkconstraint->fk_attrs) != list_length(fkconstraint->pk_attrs))
ereport(ERROR,
(errcode(ERRCODE_INVALID_FOREIGN_KEY),
errmsg("number of referencing and referenced columns for foreign key disagree")));
forboth(fk_attr, fkconstraint->fk_attrs,
pk_attr, fkconstraint->pk_attrs)
{
fk_trigger->args = lappend(fk_trigger->args, lfirst(fk_attr));
fk_trigger->args = lappend(fk_trigger->args, lfirst(pk_attr));
}
trigobj->objectId = CreateTrigger(fk_trigger, true);
/* Register dependency from trigger to constraint */
recordDependencyOn(trigobj, constrobj, DEPENDENCY_INTERNAL);
/* Make changes-so-far visible */
CommandCounterIncrement();
}
/*
* Create the triggers that implement an FK constraint.
*/
@@ -4415,51 +4478,10 @@ createForeignKeyTriggers(Relation rel, FkConstraint *fkconstraint,
/*
* Build and execute a CREATE CONSTRAINT TRIGGER statement for the
* CHECK action.
* CHECK action for both INSERTs and UPDATEs on the referencing table.
*/
fk_trigger = makeNode(CreateTrigStmt);
fk_trigger->trigname = fkconstraint->constr_name;
fk_trigger->relation = myRel;
fk_trigger->funcname = SystemFuncName("RI_FKey_check_ins");
fk_trigger->before = false;
fk_trigger->row = true;
fk_trigger->actions[0] = 'i';
fk_trigger->actions[1] = 'u';
fk_trigger->actions[2] = '\0';
fk_trigger->isconstraint = true;
fk_trigger->deferrable = fkconstraint->deferrable;
fk_trigger->initdeferred = fkconstraint->initdeferred;
fk_trigger->constrrel = fkconstraint->pktable;
fk_trigger->args = NIL;
fk_trigger->args = lappend(fk_trigger->args,
makeString(fkconstraint->constr_name));
fk_trigger->args = lappend(fk_trigger->args,
makeString(myRel->relname));
fk_trigger->args = lappend(fk_trigger->args,
makeString(fkconstraint->pktable->relname));
fk_trigger->args = lappend(fk_trigger->args,
makeString(fkMatchTypeToString(fkconstraint->fk_matchtype)));
if (list_length(fkconstraint->fk_attrs) != list_length(fkconstraint->pk_attrs))
ereport(ERROR,
(errcode(ERRCODE_INVALID_FOREIGN_KEY),
errmsg("number of referencing and referenced columns for foreign key disagree")));
forboth(fk_attr, fkconstraint->fk_attrs,
pk_attr, fkconstraint->pk_attrs)
{
fk_trigger->args = lappend(fk_trigger->args, lfirst(fk_attr));
fk_trigger->args = lappend(fk_trigger->args, lfirst(pk_attr));
}
trigobj.objectId = CreateTrigger(fk_trigger, true);
/* Register dependency from trigger to constraint */
recordDependencyOn(&trigobj, &constrobj, DEPENDENCY_INTERNAL);
/* Make changes-so-far visible */
CommandCounterIncrement();
CreateFKCheckTrigger(myRel, fkconstraint, &constrobj, &trigobj, true);
CreateFKCheckTrigger(myRel, fkconstraint, &constrobj, &trigobj, false);
/*
* Build and execute a CREATE CONSTRAINT TRIGGER statement for the ON