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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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19
src/backend/nodes/copyfuncs.c
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@ -15,7 +15,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/nodes/copyfuncs.c,v 1.377 2007/06/05 21:31:04 tgl Exp $
* $PostgreSQL: pgsql/src/backend/nodes/copyfuncs.c,v 1.378 2007/06/11 01:16:22 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1299,6 +1299,20 @@ _copySetToDefault(SetToDefault *from)
return newnode;
}
/*
* _copyCurrentOfExpr
*/
static CurrentOfExpr *
_copyCurrentOfExpr(CurrentOfExpr *from)
{
CurrentOfExpr *newnode = makeNode(CurrentOfExpr);
COPY_SCALAR_FIELD(cvarno);
COPY_STRING_FIELD(cursor_name);
return newnode;
}
/*
* _copyTargetEntry
*/
@ -3177,6 +3191,9 @@ copyObject(void *from)
case T_SetToDefault:
retval = _copySetToDefault(from);
break;
case T_CurrentOfExpr:
retval = _copyCurrentOfExpr(from);
break;
case T_TargetEntry:
retval = _copyTargetEntry(from);
break;