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Support UPDATE/DELETE WHERE CURRENT OF cursor_name, per SQL standard.

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Along the way, allow FOR UPDATE in non-WITH-HOLD cursors; there may once
have been a reason to disallow that, but it seems to work now, and it's
really rather necessary if you want to select a row via a cursor and then
update it in a concurrent-safe fashion.

Original patch by Arul Shaji, rather heavily editorialized by Tom Lane.
This commit is contained in:
Tom Lane
2007-06-11 01:16:30 +00:00
parent 85d72f0516
commit 6808f1b1de
30 changed files with 940 additions and 127 deletions

20
src/backend/executor/execMain.c

@ -26,7 +26,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/executor/execMain.c,v 1.294 2007/06/03 17:07:00 tgl Exp $
* $PostgreSQL: pgsql/src/backend/executor/execMain.c,v 1.295 2007/06/11 01:16:22 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -2368,6 +2368,24 @@ EvalPlanQualStop(evalPlanQual *epq)
epq->planstate = NULL;
}
/*
* ExecGetActivePlanTree --- get the active PlanState tree from a QueryDesc
*
* Ordinarily this is just the one mentioned in the QueryDesc, but if we
* are looking at a row returned by the EvalPlanQual machinery, we need
* to look at the subsidiary state instead.
*/
PlanState *
ExecGetActivePlanTree(QueryDesc *queryDesc)
{
EState *estate = queryDesc->estate;
if (estate && estate->es_useEvalPlan && estate->es_evalPlanQual != NULL)
return estate->es_evalPlanQual->planstate;
else
return queryDesc->planstate;
}
/*
* Support for SELECT INTO (a/k/a CREATE TABLE AS)