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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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9
src/include/nodes/primnodes.h
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@@ -10,7 +10,7 @@
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/nodes/primnodes.h,v 1.131 2007/06/11 01:16:30 tgl Exp $
* $PostgreSQL: pgsql/src/include/nodes/primnodes.h,v 1.132 2007/06/11 22:22:42 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -922,12 +922,17 @@ typedef struct SetToDefault
* of the target relation being constrained; this aids placing the expression
* correctly during planning. We can assume however that its "levelsup" is
* always zero, due to the syntactic constraints on where it can appear.
*
* The referenced cursor can be represented either as a hardwired string
* or as a reference to a run-time parameter of type REFCURSOR. The latter
* case is for the convenience of plpgsql.
*/
typedef struct CurrentOfExpr
{
Expr xpr;
Index cvarno; /* RT index of target relation */
char *cursor_name; /* name of referenced cursor */
char *cursor_name; /* name of referenced cursor, or NULL */
int cursor_param; /* refcursor parameter number, or 0 */
} CurrentOfExpr;
/*--------------------