RE: Branching logic in PL/SQL, positive instead of exception

From: Alec Macdonell <amacdonell_at_usscript.com>
Date: Wed, 13 Mar 2002 14:04:33 -0800
Message-ID: <F001.00428180.20020313140433@fatcity.com>

Branching logic in PL/SQL, positive instead of exceptionI believe something like this might work.

DECLARE    cursor test_csr is

      SELECT col1
          FROM test.table t
       WHERE exists(
             SELECT z.zip
                FROM zip_table
              WHERE t.zip = zip);

BEGIN    OPEN test_csr;

   /* This step tests if any data is returned by the cursor */   IF test_cursor%FOUND then
    /* Do stuff */
  ELSE
    /* Do something else */

END;
/

The %FOUND will test if the cursor returned rows while %NOTFOUND returns true if no data is returned. I do not believe opening a cursor in this manner will produce a no_data_found exception. Use the FETCH <cursor_name> INTO <variables> to retrieve values from the curpsr if needed. I hope I read your question correctly and this helped.

Alec
  -----Original Message-----
  From: root_at_fatcity.com [mailto:root_at_fatcity.com]On Behalf Of Hagedorn, Linda
  Sent: Wednesday, March 13, 2002 12:34 PM   To: Multiple recipients of list ORACLE-L   Subject: Branching logic in PL/SQL, positive instead of exception

  Hello,

  I'm looking for an example of structured PL/SQL code that does not use exception logic for branching, but instead recognizes that data is found.

  As a bad example,

   Select col1 from test.table t where exists (select z.zip from zip_table z where t.zip=z.zip ) into v_col1 ;

   exception
   when no_data_found

     begin
     select col2 from test.table2 t2 where exists (select z.zip from
zip_table z where t2.zip=z.zip) into v_col1 ; ;
     exception
     when no_data_found
       begin

  I've checked the books and cannot see how to test for a positive result instead of a negative (exception) result.

  Does anyone have a good example of branching logic on record found?

  Thanks, Linda

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Author: Alec Macdonell
  INET: amacdonell_at_usscript.com

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