Debug an Oracle Function

I need to analyze the following function.

        swbsCount number;
        swbsHolder VARCHAR(4000);
        counter int;


            swbs := '';
            swbsHolder := '';
            counter := 1;

                CURSOR CUR_CURSOR  is
                    select rownum as numb,
                       COALESCE(swbs,'-'),' '
                      as swbs_info
                        from t_psa_swbs a
                                    where PSA_MASTER_SEQNUM = 3;


Cursor rows returned:
numb (rownum)      swbs_info
1                  0004
2                  0003
3                  0001
4                  0002

FOR cur_rec IN CUR_CURSOR  --
                    select cur_rec.swbs_info into swbsHolder from dual;
                    swbs := swbs || swbsHolder ||'   ' ;
                end loop;

        return swbs;

This looks like it would return the string "0004 0003 0001 0002 " 

How can I test the function?

How can I debug the function and watch each step ?
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slightwv (䄆 Netminder) Commented:
To 'test' it:
select function_name from dual;

For 'debugging' it, you'll need a tool that has a pl/sql debugger built into it.

Take a look at Oracle's SQL Developer:

That said, there are MUCH better ways of string concatenation that what you have posted.

In 11g and above check out LISTAGG.  It is a built-in function that does this:

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DovbermanAuthor Commented:
Excellent. Thanks
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