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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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3
src/include/nodes/nodes.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/nodes/nodes.h,v 1.200 2007/06/05 21:31:08 tgl Exp $
* $PostgreSQL: pgsql/src/include/nodes/nodes.h,v 1.201 2007/06/11 01:16:30 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -139,6 +139,7 @@ typedef enum NodeTag
T_CoerceToDomain,
T_CoerceToDomainValue,
T_SetToDefault,
T_CurrentOfExpr,
T_TargetEntry,
T_RangeTblRef,
T_JoinExpr,