Re: call the same pl/pgsql procedure twice in the same connection

jack wrote:
> I have a function with pl/pgSQL such as...
> CREATE FUNCTION comp_userExp (TEXT) RETURNS INTEGER AS '
> DECLARE
> stUserName TEXT;
> BEGIN
> stUserName := upper($1);
>
> CREATE TEMP TABLE comuser AS
> SELECT * FROM comt_user1
> WHERE userName=stUserName;
>
> CREATE TEMP TABLE comUser1 AS
> SELECT a.userName FROM comt_user2 a, comuser b
> WHERE a.userName = b.userName
> ORDER BY b.userName;
>
> CREATE TEMP TABLE comUser2 AS
> SELECT a.userName FROM comt_user3 a, comuser b
> WHERE a.userName = b.userName
> ORDER BY b.userName;
>
> DROP Table comuser,comuser1,comuser2;
>
> RETURN 0;
>
> END;'
> LANGUAGE 'PLPGSQL';
>
> This function can't run twice in the same connection session. After tracing
> error, the reason is because 2nd and 3rd SQL refer to table comuser. It will
> cause "can't find relation number xxxxx". I think ,after first run, the
> procedure just use relation number to access table, while actually table was
> dropped and create again with a different relation number on the 2nd time.
> If I disconnect database, and re-connect again, it won't cuase any problem.
> If don't want to disconnect and connect, is there any way to fix the
> problem?

Yes, this is coming up a lot recently, maybe an FAQ. You need to use
EXECUTE in plpgsql so the string is reparsed every time and the proper
oid assigned.

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