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

From: Hagedorn, Linda <lindah_at_epocrates.com>
Date: Wed, 13 Mar 2002 14:43:48 -0800
Message-ID: <F001.004285A6.20020313144348@fatcity.com>

Thank you very much Alec. You brought an interesting light to this. I have to test about 8 different conditions, each turns on the output of the previous. I'll give it a shot. Thanks very much for the idea. Linda

-----Original Message-----
Sent: Wednesday, March 13, 2002 2:05 PM
To: Multiple recipients of list ORACLE-L

I 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-----
Sent: Wednesday, March 13, 2002 12:34 PM To: Multiple recipients of list ORACLE-L

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: Hagedorn, Linda
INET: lindah_at_epocrates.com

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