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.