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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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8
src/backend/utils/adt/ruleutils.c
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@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/ruleutils.c,v 1.259 2007/06/05 21:31:06 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/ruleutils.c,v 1.260 2007/06/11 01:16:29 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -3086,6 +3086,7 @@ isSimpleNode(Node *node, Node *parentNode, int prettyFlags)
case T_Param:
case T_CoerceToDomainValue:
case T_SetToDefault:
case T_CurrentOfExpr:
/* single words: always simple */
return true;
@ -4134,6 +4135,11 @@ get_rule_expr(Node *node, deparse_context *context,
appendStringInfo(buf, "DEFAULT");
break;
case T_CurrentOfExpr:
appendStringInfo(buf, "CURRENT OF %s",
quote_identifier(((CurrentOfExpr *) node)->cursor_name));
break;
case T_List:
{
char *sep;