Return-Path: Received: from ensim.rackshack.net (root@localhost) by orafaq.net (8.11.6/8.11.6) with ESMTP id h8Q4Jhr11726 for ; Thu, 25 Sep 2003 23:19:43 -0500 X-ClientAddr: 66.27.56.213 Received: from www2.fatcity.com (rrcs-west-66-27-56-213.biz.rr.com [66.27.56.213]) by ensim.rackshack.net (8.11.6/8.11.6) with ESMTP id h8Q4Jgc11721 for ; Thu, 25 Sep 2003 23:19:42 -0500 Received: (from root@localhost) by www2.fatcity.com (8.11.6/8.11.6) id h8Q1emV11773 for oracle-l@orafaq.net; Thu, 25 Sep 2003 18:40:48 -0700 Received: by fatcity.com (05-Jun-2003/v1.0g-b73/bab) via fatcity.com id 005D116B; Thu, 25 Sep 2003 18:39:36 -0800 Message-ID: Date: Thu, 25 Sep 2003 18:39:36 -0800 To: Multiple recipients of list ORACLE-L X-Comment: Oracle RDBMS Community Forum X-Sender: Mladen Gogala Sender: ml-errors@fatcity.com Reply-To: ORACLE-L@fatcity.com Errors-To: ML-ERRORS@fatcity.com From: Mladen Gogala Subject: Re: equivalent for isdate, isnumeric Organization: Fat City Network Services, San Diego, California X-ListServer: v1.0g, build 73; ListGuru (c) 1996-2003 Bruce A. Bergman Precedence: bulk Mime-Version: 1.0 Content-Type: text/plain; Format=Flowed; DelSp=Yes; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Before the "deterministic" qualifications, there was only one way to use a user defined function in the select list of a query: it was PRAGMA RESTRICT_REFERENCES(WNDS,WNPS) The only place where you could do it was in a package. In other words, if a user defined function was to be used in the select list, it should have been part of a package. Every man is a part of the continent, a piece of the whole, but not every function should be a part of a package, unless absolutely necessary. That's why our friendly Oracle Corporation has provided DETERMINISTIC clause, among other things. Deterministic functions can be used in in select list and function based indexes. Non-deterministic functions can not. Here is a possible use use: 1 begin 2 if (isnumeric('&&item')) 3 then dbms_output.put_line('&&tem'||' is numeric string.'); 4 else dbms_output.put_line('&&tem'||' is non-numeric string.'); 5 end if; 6* end; SQL> / Enter value for item: 1234 old 2: if (isnumeric('&&item')) new 2: if (isnumeric('1234')) old 3: then dbms_output.put_line('&&tem'||' is numeric string.'); new 3: then dbms_output.put_line('c'||' is numeric string.'); old 4: else dbms_output.put_line('&&tem'||' is non-numeric string.'); new 4: else dbms_output.put_line('c'||' is non-numeric string.'); c is numeric string. PL/SQL procedure successfully completed. SQL> undef item SQL> / Enter value for item: qwerty old 2: if (isnumeric('&&item')) new 2: if (isnumeric('qwerty')) old 3: then dbms_output.put_line('&&tem'||' is numeric string.'); new 3: then dbms_output.put_line('c'||' is numeric string.'); old 4: else dbms_output.put_line('&&tem'||' is non-numeric string.'); new 4: else dbms_output.put_line('c'||' is non-numeric string.'); c is non-numeric string. On 2003.09.25 22:04, Vladimir Begun wrote: > Tanel Poder wrote: >> Boolean is a datatype existing and usable in Oracle. > > Deterministic is an Oracle way to tell a function is deterministic, i.e. > > always returning the same result on the same input. Required for FBIs for > > example. > > http://tahiti.oracle.com > > Could you please kindly provide an example of its usage in SQL. Please > create > an FBI using the original function below (as is, no modifications or > wrappers). > It would be really intersting how "deterministic" functionality would work > for a PL/SQL function that returns BOOLEAN datatype. Thank you! >-- > Vladimir Begun > The statements and opinions expressed here are my own and > do not necessarily represent those of Oracle Corporation. > >>> boolean is not SQL datatype and it's unclear what "deterministic" >>> means here. >>> >>> Mladen Gogala wrote: >>> >>>> create or replace function >>>> isnumeric(str varchar2) return boolean deterministic >>>> as >>>> num number:=0; >>>> begin >>>> num:=to_number(str); >>>> return(true); >>>> exception >>>> when others then >>>> return(false); >>>> end; >>>> / > > >-- > Please see the official ORACLE-L FAQ: http://www.orafaq.net >-- > Author: Vladimir Begun > INET: Vladimir.Begun@oracle.com > > Fat City Network Services -- 858-538-5051 http://www.fatcity.com > San Diego, California -- Mailing list and web hosting services > --------------------------------------------------------------------- > To REMOVE yourself from this mailing list, send an E-Mail message > to: ListGuru@fatcity.com (note EXACT spelling of 'ListGuru') and in > the message BODY, include a line containing: UNSUB ORACLE-L > (or the name of mailing list you want to be removed from). You may > also send the HELP command for other information (like subscribing). -- Mladen Gogala Oracle DBA -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Mladen Gogala INET: mgogala@adelphia.net Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru@fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).