RE: PL/SQL help

From: <Paula_Stankus_at_doh.state.fl.us>
Date: Fri, 20 Sep 2002 12:20:07 -0800
Message-ID: <F001.004D58D2.20020920122007@fatcity.com>

RE: PL/SQL help

Go to Tom Kyte's sight and look for contexts - he explains a way to build sql statements using native dynamic sql and refcursors and contexts where the select statement and predicate is variable and the output might also be variable. I get there by searching www.yahoo.com for asktom

-----Original Message-----
From: Ron Thomas [mailto:rthomas@hypercom.com]
Sent: Friday, September 20, 2002 2:06 PM
To: Multiple recipients of list ORACLE-L
Subject: RE: PL/SQL help

David-

I've thought of both dbms_sql and dummy conditions too. Oracle Application reports use the dummy
conditions all the time.

I'm off to see if you can set cursor_sharing at the session level and not use bind params.

I'm assuming no one else has figured this out either due to the lack of response.

Ron Thomas
Hypercom, Inc
rthomas@hypercom.com
Each new user of a new system uncovers a new class of bugs. -- Kernighan

                      root@fatcity.com
                                               To:       ORACLE-L@fatcity.com
                      09/20/02 01:28 AM        cc:
                      Please respond to        Subject: RE: PL/SQL help
                      ORACLE-L

Ron

We've run into this problem and haven't really found a satisfactory answer.
It sounds like a job for dbms_sql, but the docs say its slower than native
dynamic sql. Has anyone tested this? One other alternative I can think of
(but have never tried) is to use dummy conditions in the sql; something
like: -

c_sql := 'select col1 from atable where col2 = :1 and :2 is null and :3 is
null';

--
David Lord

> -----Original Message-----
> From: Ron Thomas [mailto:rthomas@hypercom.com]
> Sent: 19 September 2002 19:53
> To: Multiple recipients of list ORACLE-L
> Subject: PL/SQL help
>
>
>
> I am building a dynamic sql statement which will contain
> varying number of bind variables depending
> on user selection criteria. As an example, the sql statement may be:
>
> c_sql := 'select col1 from atable where col2 = :1' ;
>
> or it may be
>
> c_sql := 'select col1 from atable where col2 = :1 and col2
> between :2 and :3' ;
>
> or it may be ... etc. I am trying to avoid ugly code such as:
>
> IF case1 THEN
>   OPEN csr FOR c_sql USING var1 ;
> ELSIF case2 THEN
>   OPEN csr FOR c_sql USING var1, var2, var3 ;
> ELSIF .....
> END IF ;
>
> Once the sql statement is created, it will be opened/closed
> multiple times, so I want to use bind
> variables to avoid parsing.
>
> So I thought, hum, sounds like a job for EXECUTE IMMEDIATE,
> but in the various incarnations I tried,
> could not get it to work. The FM have not been much help
> (still looking tho).
>
> What am I missing?
>
> Thanks,
> Ron Thomas
> Hypercom, Inc
> rthomas@hypercom.com
> Each new user of a new system uncovers a new class of bugs.
> -- Kernighan
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: Ron Thomas
>   INET: rthomas@hypercom.com
>
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Author: Ron Thomas
INET: rthomas@hypercom.com

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  INET: Paula_Stankus_at_doh.state.fl.us

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Received on Fri Sep 20 2002 - 15:20:07 CDT