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Modify UPDATE/DELETE WHERE CURRENT OF to use the FOR UPDATE infrastructure to

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locate the target row, if the cursor was declared with FOR UPDATE or FOR
SHARE.  This approach is more flexible and reliable than digging through the
plan tree; for instance it can cope with join cursors.  But we still provide
the old code for use with non-FOR-UPDATE cursors.  Per gripe from Robert Haas.
This commit is contained in:
Tom Lane
2008-11-16 17:34:28 +00:00
parent 30f272a79b
commit 18004101ac
9 changed files with 246 additions and 70 deletions
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7
src/backend/executor/execMain.c
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@ -26,7 +26,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/executor/execMain.c,v 1.316 2008/11/15 19:43:45 tgl Exp $
* $PostgreSQL: pgsql/src/backend/executor/execMain.c,v 1.317 2008/11/16 17:34:28 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -609,6 +609,7 @@ InitPlan(QueryDesc *queryDesc, int eflags)
/* We'll locate the junk attrs below */
erm->ctidAttNo = InvalidAttrNumber;
erm->toidAttNo = InvalidAttrNumber;
ItemPointerSetInvalid(&(erm->curCtid));
estate->es_rowMarks = lappend(estate->es_rowMarks, erm);
}
@ -1418,6 +1419,7 @@ lnext: ;
if (tableoid != RelationGetRelid(erm->relation))
{
/* this child is inactive right now */
ItemPointerSetInvalid(&(erm->curCtid));
continue;
}
}
@ -1481,6 +1483,9 @@ lnext: ;
elog(ERROR, "unrecognized heap_lock_tuple status: %u",
test);
}
/* Remember tuple TID for WHERE CURRENT OF */
erm->curCtid = tuple.t_self;
}
}