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Improve UPDATE/DELETE WHERE CURRENT OF so that they can be used from plpgsql

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with a plpgsql-defined cursor.  The underlying mechanism for this is that the
main SQL engine will now take "WHERE CURRENT OF $n" where $n is a refcursor
parameter.  Not sure if we should document that fact or consider it an
implementation detail.  Per discussion with Pavel Stehule.
This commit is contained in:
Tom Lane
2007-06-11 22:22:42 +00:00
parent bdc71c2cb1
commit a9545b3aef
13 changed files with 225 additions and 72 deletions
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14
src/backend/utils/adt/ruleutils.c
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@@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/ruleutils.c,v 1.260 2007/06/11 01:16:29 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/ruleutils.c,v 1.261 2007/06/11 22:22:42 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -4136,8 +4136,16 @@ get_rule_expr(Node *node, deparse_context *context,
break;
case T_CurrentOfExpr:
appendStringInfo(buf, "CURRENT OF %s",
quote_identifier(((CurrentOfExpr *) node)->cursor_name));
{
CurrentOfExpr *cexpr = (CurrentOfExpr *) node;
if (cexpr->cursor_name)
appendStringInfo(buf, "CURRENT OF %s",
quote_identifier(cexpr->cursor_name));
else
appendStringInfo(buf, "CURRENT OF $%d",
cexpr->cursor_param);
}
break;
case T_List: