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Add a new system view, pg_cursors, that displays the currently available

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cursors. Patch from Joachim Wieland, review and ediorialization by Neil
Conway. The view lists cursors defined by DECLARE CURSOR, using SPI, or
via the Bind message of the frontend/backend protocol. This means the
view does not list the unnamed portal or the portal created to implement
EXECUTE. Because we do list SPI portals, there might be more rows in
this view than you might expect if you are using SPI implicitly (e.g.
via a procedural language).

Per recent discussion on -hackers, the query string included in the
view for cursors defined by DECLARE CURSOR is based on
debug_query_string. That means it is not accurate if multiple queries
separated by semicolons are submitted as one query string. However,
there doesn't seem a trivial fix for that: debug_query_string
is better than nothing. I also changed SPI_cursor_open() to include
the source text for the portal it creates: AFAICS there is no reason
not to do this.

Update the documentation and regression tests, bump the catversion.
This commit is contained in:
Neil Conway
2006-01-18 06:49:30 +00:00
parent 558bc2584d
commit 33e06ebccb
17 changed files with 388 additions and 32 deletions
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4
src/backend/tcop/postgres.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/tcop/postgres.c,v 1.478 2006/01/08 07:00:25 neilc Exp $
* $PostgreSQL: pgsql/src/backend/tcop/postgres.c,v 1.479 2006/01/18 06:49:27 neilc Exp $
*
* NOTES
* this is the "main" module of the postgres backend and
@ -956,6 +956,8 @@ exec_simple_query(const char *query_string)
* already is one, silently drop it.
*/
portal = CreatePortal("", true, true);
/* Don't display the portal in pg_cursors */
portal->visible = false;
PortalDefineQuery(portal,
query_string,