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Disallow scrolling of FOR UPDATE/FOR SHARE cursors, so as to avoid problems

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in corner cases such as re-fetching a just-deleted row.  We may be able to
relax this someday, but let's find out how many people really care before
we invest a lot of work in it.  Per report from Heikki and subsequent
discussion.

While in the neighborhood, make the combination of INSENSITIVE and FOR UPDATE
throw an error, since they are semantically incompatible.  (Up to now we've
accepted but just ignored the INSENSITIVE option of DECLARE CURSOR.)
This commit is contained in:
Tom Lane
2007-10-24 23:27:08 +00:00
parent 8a35b07e18
commit 048efc25e4
7 changed files with 62 additions and 35 deletions
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4
src/include/nodes/parsenodes.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/parsenodes.h,v 1.353 2007/09/03 18:46:30 tgl Exp $
* $PostgreSQL: pgsql/src/include/nodes/parsenodes.h,v 1.354 2007/10/24 23:27:08 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -1479,7 +1479,7 @@ typedef struct CommentStmt
#define CURSOR_OPT_BINARY 0x0001 /* BINARY */
#define CURSOR_OPT_SCROLL 0x0002 /* SCROLL explicitly given */
#define CURSOR_OPT_NO_SCROLL 0x0004 /* NO SCROLL explicitly given */
#define CURSOR_OPT_INSENSITIVE 0x0008 /* INSENSITIVE (unimplemented) */
#define CURSOR_OPT_INSENSITIVE 0x0008 /* INSENSITIVE */
#define CURSOR_OPT_HOLD 0x0010 /* WITH HOLD */
#define CURSOR_OPT_FAST_PLAN 0x0020 /* prefer fast-start plan */