in reply to Throw DB error

May be I am misunderstanding your question but if all you want is to get a database error why can't you change your code to provide incorrect SQL syntax or an incorrect parameter to a procedure or whatever. If you cannot change your code can you lock a table the code uses and wait for a lock timeout? This seems so straight forward I'm sure you must mean something else. If so what kind of "database" error do you need?

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Re^2: Throw DB error
by Anonymous Monk on Mar 02, 2010 at 20:07 UTC
    Rather than locking a table (very unusual in Oracle), you can try simply misspelling a column name in your SQL statement. Oracle's compiler will throw an error for that. 
    select fred from global_name
       *
ERROR at line 1:
ORA-00904: "FRED": invalid identifier

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      Thanks for your reply. But i thing is, my code has to run for some extent then it has to throw DB error. So that only i can test my code for particular case. Tell me how can i throw db error at somewhere middle in the code

      By Bheema

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Re^2: Throw DB error
by Bheema_Tyco (Novice) on Mar 03, 2010 at 05:51 UTC

    Thanks for your Ans But the thing i don't wants to change my SQL query. Because for extent it should work and then it should throw db error. So how should i throw db error intentionally

    By Bheema

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      If you don't want to change your SQL then you will have to create a problem at the database end by ensuring some of your SQL fails - e.g., manually create a row which will cause a constraint to fail in your SQL, delete a key, change permissions etc. The possibilities are endless so I'm not listing all I can think of here.

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        I am sorry again i am disturbing YOU. i don't want to change either in sql query or deleting rows. I am asking that, is there any mechanism in perl that a person can throw error intentionally. Because i am using 

         $SIG{__WARN__} = \&WARN_Handler;
$SIG{__DIE__} = \&DIE_Handler;

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        And i also written code for handle error using WARN_HANDLER AND DIE_HANDLER

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