[转]Oracle ORA-01403: no data found Exception SYS_REFCURSOR

本文转自：http://stackoverflow.com/questions/9104153/what-is-the-correct-way-to-deal-with-this-oracle-ora-01403-no-data-found-except

This leads to the familiar ORA-01403: no data found exception. I tried to change the SP so that it would return NULL record in this case - the same sort of result you'd get it a query couldn't find any records - but to no avail. I am doing something wrong here.

PROCEDURE sp_GetNextEmailFromQueue (pAgentId IN NUMBER, pRecs OUT recordSet)IS
  EMAIL_ID INTEGER;BEGINSELECT id INTO EMAIL_ID FROM(SELECT id, is_replied_to, is_being_worked, date_received
           FROM SSQ_EMAILS
           WHERE is_replied_to =0AND is_being_worked =0ORDERBY date_received ASC)WHERE rownum =1;UPDATE SSQ_EMAILS x
             SET x.is_being_worked =1,
                 x.agent_id = pAgentId,
                 x.work_started_date = SYSDATE
             WHERE x.id = EMAIL_ID;OPEN pRecs FORSELECT x.id,
             x.message_id,
             x.to_email,
             x.from_email,
             x.subject,
             x.message,
             x.date_received,
             x.href_link,
             x.is_being_worked,
             x.work_started_date,
             x.is_replied_to
        FROM SSQ_EMAILS x
        WHERE x.id = EMAIL_ID;

        EXCEPTION
          WHEN no_data_found
            THEN OPEN pRecs FOR SELECT NULL FROM SSQ_EMAILS;
       END;

答：

Solved it by doing this:

EXCEPTION
   WHEN no_data_found THEN
　　　　OPEN pRecs FOR
　　　　　　SELECT NULL FROM SSQ_EMAILS  s
      WHERE s.id ISNULL;

It works because the RefCursor has to be opened.

I need an empty result, and this seems like a safe way to guarantee that, because the ID is the PK and cannot be null.