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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
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14
src/backend/nodes/equalfuncs.c
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@@ -18,7 +18,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/nodes/equalfuncs.c,v 1.308 2007/06/05 21:31:04 tgl Exp $
* $PostgreSQL: pgsql/src/backend/nodes/equalfuncs.c,v 1.309 2007/06/11 01:16:22 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -598,6 +598,15 @@ _equalSetToDefault(SetToDefault *a, SetToDefault *b)
return true;
}
static bool
_equalCurrentOfExpr(CurrentOfExpr *a, CurrentOfExpr *b)
{
COMPARE_SCALAR_FIELD(cvarno);
COMPARE_STRING_FIELD(cursor_name);
return true;
}
static bool
_equalTargetEntry(TargetEntry *a, TargetEntry *b)
{
@@ -2124,6 +2133,9 @@ equal(void *a, void *b)
case T_SetToDefault:
retval = _equalSetToDefault(a, b);
break;
case T_CurrentOfExpr:
retval = _equalCurrentOfExpr(a, b);
break;
case T_TargetEntry:
retval = _equalTargetEntry(a, b);
break;