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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/outfuncs.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/nodes/outfuncs.c,v 1.309 2007/06/05 21:31:04 tgl Exp $
* $PostgreSQL: pgsql/src/backend/nodes/outfuncs.c,v 1.310 2007/06/11 01:16:22 tgl Exp $
*
* NOTES
* Every node type that can appear in stored rules' parsetrees *must*
@@ -1058,6 +1058,15 @@ _outSetToDefault(StringInfo str, SetToDefault *node)
WRITE_INT_FIELD(typeMod);
}
static void
_outCurrentOfExpr(StringInfo str, CurrentOfExpr *node)
{
WRITE_NODE_TYPE("CURRENTOFEXPR");
WRITE_UINT_FIELD(cvarno);
WRITE_STRING_FIELD(cursor_name);
}
static void
_outTargetEntry(StringInfo str, TargetEntry *node)
{
@@ -2229,6 +2238,9 @@ _outNode(StringInfo str, void *obj)
case T_SetToDefault:
_outSetToDefault(str, obj);
break;
case T_CurrentOfExpr:
_outCurrentOfExpr(str, obj);
break;
case T_TargetEntry:
_outTargetEntry(str, obj);
break;