Re: Implementing RESET CONNECTION ...

Attached patch applied, with slight modifications.  Thanks.

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Hans-Jrgen Schnig wrote:
> We have implemented a patch which can be used by connection pools for 
> instance.
> RESECT CONNECTION cleans up a backend so that it can be reused.
> Temp tables, LISTEN / NOTIFY stuff, WITH HOLD cursors, open 
> transactions, prepared statements and GUCs are cleaned up.
> I hope we have not missed important per-backend information.
> 
> test=# BEGIN;
> BEGIN
> test=# RESET CONNECTION;
> RESET
> test=# COMMIT;
> WARNING:  there is no transaction in progress
> COMMIT
> test=# PREPARE myplan(int, int) AS SELECT $1 + $2;
> PREPARE
> test=# RESET CONNECTION;
> RESET
> test=# EXECUTE myplan(1, 2);
> ERROR:  prepared statement "myplan" does not exist
> test=#
> test=# DECLARE mycur CURSOR WITH HOLD FOR SELECT relname FROM pg_class;
> DECLARE CURSOR
> test=# FETCH NEXT FROM mycur;
>   relname
> ---------
>   views
> (1 row)
> 
> test=# RESET CONNECTION;
> RESET
> test=# FETCH NEXT FROM mycur;
> ERROR:  cursor "mycur" does not exist
> test=# CREATE TEMP TABLE mytmp (id int4);
> CREATE TABLE
> test=# RESET CONNECTION;
> RESET
> test=# INSERT INTO mytmp VALUES (10);
> ERROR:  relation "mytmp" does not exist
> 
> 
> All regression tests passed.
> It would be nice if we had this in 8.1.
> 
> 	Best regards,
> 
> 		Hans
> 
> 
> -- 
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> 


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