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Minor efficiency improvements in keeping track of trigger deferred 

status.  In particular, I see no reason for deferredTriggerCheckState
to make an explicit entry to note that a particular trigger has its
default state --- that just clutters a list that should normally be
empty or very short.  I have plans to revise this module much more
heavily, but this is a simple separable improvement.
This commit is contained in:
Tom Lane 2004-09-08 23:47:58 +00:00
parent b1c4bdae74
commit f62901ca81
1 changed files with 28 additions and 37 deletions
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65
src/backend/commands/trigger.c
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/trigger.c,v 1.170 2004/09/07 21:48:30 tgl Exp $
* $PostgreSQL: pgsql/src/backend/commands/trigger.c,v 1.171 2004/09/08 23:47:58 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1772,7 +1772,7 @@ static DeferredTriggerState DeferredTriggerStateAddItem(DeferredTriggerState sta
static bool
deferredTriggerCheckState(Oid tgoid, int32 itemstate)
{
bool tgisdeferred;
DeferredTriggerState state = deferredTriggers->state;
int i;
/*
@ -1783,32 +1783,24 @@ deferredTriggerCheckState(Oid tgoid, int32 itemstate)
return false;
/*
* Lookup if we know an individual state for this trigger
* Check if SET CONSTRAINTS has been executed for this specific trigger.
*/
for (i = 0; i < deferredTriggers->state->numstates; i++)
for (i = 0; i < state->numstates; i++)
{
if (deferredTriggers->state->trigstates[i].dts_tgoid == tgoid)
return deferredTriggers->state->trigstates[i].dts_tgisdeferred;
if (state->trigstates[i].dts_tgoid == tgoid)
return state->trigstates[i].dts_tgisdeferred;
}
/*
* No individual state known - so if the user issued a SET CONSTRAINT
* ALL ..., we return that instead of the triggers default state.
* Check if SET CONSTRAINTS ALL has been executed; if so use that.
*/
if (deferredTriggers->state->all_isset)
return deferredTriggers->state->all_isdeferred;
if (state->all_isset)
return state->all_isdeferred;
/*
* No ALL state known either, remember the default state as the
* current and return that. (XXX why do we bother making a state
* entry?)
* Otherwise return the default state for the trigger.
*/
tgisdeferred = ((itemstate & TRIGGER_DEFERRED_INITDEFERRED) != 0);
deferredTriggers->state =
DeferredTriggerStateAddItem(deferredTriggers->state,
tgoid, tgisdeferred);
return tgisdeferred;
return ((itemstate & TRIGGER_DEFERRED_INITDEFERRED) != 0);
}
@ -2486,8 +2478,7 @@ DeferredTriggerSetState(ConstraintsSetStmt *stmt)
if (stmt->constraints == NIL)
{
/*
* Drop all per-transaction information about individual trigger
* states.
* Forget any previous SET CONSTRAINTS commands in this transaction.
*/
deferredTriggers->state->numstates = 0;
@ -2545,23 +2536,22 @@ DeferredTriggerSetState(ConstraintsSetStmt *stmt)
while (HeapTupleIsValid(htup = systable_getnext(tgscan)))
{
Form_pg_trigger pg_trigger = (Form_pg_trigger) GETSTRUCT(htup);
Oid constr_oid;
/*
* If we found some, check that they fit the deferrability
* but skip ON <event> RESTRICT ones, since they are
* silently never deferrable.
*/
if (stmt->deferred && !pg_trigger->tgdeferrable &&
pg_trigger->tgfoid != F_RI_FKEY_RESTRICT_UPD &&
if (pg_trigger->tgfoid != F_RI_FKEY_RESTRICT_UPD &&
pg_trigger->tgfoid != F_RI_FKEY_RESTRICT_DEL)
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("constraint \"%s\" is not deferrable",
cname)));
constr_oid = HeapTupleGetOid(htup);
oidlist = lappend_oid(oidlist, constr_oid);
{
if (stmt->deferred && !pg_trigger->tgdeferrable)
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("constraint \"%s\" is not deferrable",
cname)));
oidlist = lappend_oid(oidlist, HeapTupleGetOid(htup));
}
found = true;
}
@ -2573,7 +2563,8 @@ DeferredTriggerSetState(ConstraintsSetStmt *stmt)
if (!found)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("constraint \"%s\" does not exist", cname)));
errmsg("constraint \"%s\" does not exist",
cname)));
}
heap_close(tgrel, AccessShareLock);
@ -2584,14 +2575,15 @@ DeferredTriggerSetState(ConstraintsSetStmt *stmt)
foreach(l, oidlist)
{
Oid tgoid = lfirst_oid(l);
DeferredTriggerState state = deferredTriggers->state;
bool found = false;
int i;
for (i = 0; i < deferredTriggers->state->numstates; i++)
for (i = 0; i < state->numstates; i++)
{
if (deferredTriggers->state->trigstates[i].dts_tgoid == tgoid)
if (state->trigstates[i].dts_tgoid == tgoid)
{
deferredTriggers->state->trigstates[i].dts_tgisdeferred = stmt->deferred;
state->trigstates[i].dts_tgisdeferred = stmt->deferred;
found = true;
break;
}
@ -2599,8 +2591,7 @@ DeferredTriggerSetState(ConstraintsSetStmt *stmt)
if (!found)
{
deferredTriggers->state =
DeferredTriggerStateAddItem(deferredTriggers->state,
tgoid, stmt->deferred);
DeferredTriggerStateAddItem(state, tgoid, stmt->deferred);
}
}
}