parameter test conditions not

I'm converting some infiltration in PL/SQL operations and I have a situation where
based on the results (i.e. the returned rows) I run different code.

So I have a v_file_name_found parameter which is set locally to the procedure.
The procedure is placed in a file name and I search for it...
If found I then assign it to the v_file_name_found, if
where clause has been reached. If I get 0 rows back, I A, if I get lines > 0 then I do B.

In oracle that I have to assign the v_file_name because everything I do is test the
where clause conditions?

Here is the code of the entry with a handful of oraclese that I added to the conversion...
create or replace procedure   msg_read  (file_name in char)
user authid

v_file_name_found    char;

Begin

 select a.file_name into v_file_name_found 
  from table One A, Table Two B
where a.file_name = b.file_name and
a.vol_id = vol_id;

if sqlcode <> 0  then  ... do something  AAA 

else

if iirowcound = 0  then   do BBB 

end;
/
Thank you for your understanding.

Published by: BluShadow on May 16, 2011 15:11
addition of {noformat}
{noformat} tags and fixed the <> symbols that don't appear together on the forum.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    

Hello

What you have is a good way to do it in Oracle.
You must SELECT IN something, if you need a variable. If all you really want to know is whether the query found something, or not, then you can do something like this:

CREATE OR REPLACE PROCEDURE msg_read (in_file_name IN VARCHAR2)
AUTHID CURRENT_USER
IS

     v_file_name_found     a.file_name%TYPE;

BEGIN
    BEGIN
            SELECT     a.file_name
     INTO     v_file_name_found
     FROM     table_One A
     ,     Table_Two B
     WHERE     a.file_name     = b.file_name
     AND     a.vol_id          = vol_id
     AND     ROWNUM          = 1;

     -- Do AAA
     ...

    EXCEPTION
        WHEN  NO_DATA_FOUND
     THEN
         -- Do BBB
         ...
    END;    -- End of nested BEGIN block

    -- The following code is done in all cases (unless a real error occurred) after AAA or BBB
    ...
END     msg_read;

where catch you the error that occurs when the query returns 0 rows. However, you must always SELECT a variable, so in this case, I don't think that thie approach wins above whatever it is for you. Keep doing it the way that you thought of.

I have not tested the code above, but I know that it is closer to the correct Oracle syntax.

Do not use the CHAR data type. Use VARCHAR2 or, if you want to specify that a variable local is the same type and size as a column of data, using % TYPE, as I did above.

If the filename is the name of a column, you must choose a different name for the parameter, such as file_name_given or in_file_name. This is not necessarily a mistake to use the same name, but it can be confusing.

If a SELECT INTO statement detects more than 1 row, it triggers the TOO_MANY_ROWS error. You could test for it in the section of the EXCEPTION to a nested block, but it is easier to avoid it completely by
(a) using ROWNUM = 1, as shown above
(b) to rewrite the query to use aggregate functions (but no GROUP BY), or
(c) re-writng the query as an EXISTS subquery, as in "Double WHERE EXISTS SELECT 1 (...)"

Published by: Frank Kulash, May 16, 2011 10:18

Tags: Database

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    My Blog: http://www.inside-oracle-apex.com
    APEX Plug-Ins: http://apex.oracle.com/plugins
    Twitter: http://www.twitter.com/patrickwolf

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