Error Handling In Sybase
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handling is different in the Watcom-SQL and Transact-SQL dialects. By default, Watcom-SQL dialect procedures exit when they encounter an error, returning SQLSTATE error handling oracle and SQLCODE values to the calling environment. You can build explicit
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error handling into Watcom-SQL stored procedures using the EXCEPTION statement, or you can instruct the procedure
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to continue execution at the next statement when it encounters an error, using the ON EXCEPTION RESUME statement. When a Transact-SQL dialect procedure encounters an error,
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execution continues at the following statement. The global variable @@error holds the error status of the most recently executed statement. You can check this variable following a statement to force return from a procedure. For example, the following statement causes an exit if an error occurs: IF @@error != 0 RETURN When the sybase catch error procedure completes execution, a return value indicates the success or failure of the procedure. This return status is an integer, and can be accessed as follows: DECLARE @status INT EXECUTE @status = proc_sample IF @status = 0 PRINT 'procedure succeeded' ELSE PRINT 'procedure failed' Table A-2 describes the built-in procedure return values and their meanings: Table A-2: Built-in procedure return values Value Meaning 0 Procedure executed without error -1 Missing object -2 Data type error -3 Process was chosen as deadlock victim -4 Permission error -5 Syntax error -6 Miscellaneous user error -7 Resource error, such as out of space -8 Nonfatal internal problem -9 System limit was reached -10 Fatal internal inconsistency -11 Fatal internal inconsistency -12 Table or index is corrupt -13 Database is corrupt -14 Hardware error The RETURN statement can be used to return other integers, with their own user-defined meanings. Copyright © 2009. Sybase Inc. All rights reserved. View this document as PDF
than pass the error back to the calling environment. This is done through the use of error handling in sybase stored procedure an exception handler. You define an exception handler with the sybase raiserror EXCEPTION part of a compound statement. Whenever an error occurs in the compound statement, the exception sybase error codes handler executes. Unlike errors, warnings do not cause exception handling code to be executed. Exception handling code also executes if an error appears in a nested compound http://infocenter.sybase.com/help/topic/com.sybase.infocenter.dc38151.1510/html/iqrefbb/Tseh.htm statement or in a procedure or trigger invoked anywhere within the compound statement. An exception handler for the interrupt error SQL_INTERRUPT, SQLSTATE 57014 should only contain non-interruptible statements such as ROLLBACK and ROLLBACK TO SAVEPOINT. If the exception handler contains interruptible statements that are invoked when the connection is interrupted, the database server http://infocenter.sybase.com/help/topic/com.sybase.infocenter.dc01771.1600/doc/html/saiq-pteweh.html stops the exception handler at the first interruptible statement and returns the interrupt error. An exception handler can use the SQLSTATE or SQLCODE special values to determine why a statement failed. Alternatively, the ERRORMSG function can be used without an argument to return the error condition associated with a SQLSTATE. Only the first statement in each WHEN clause can specify this information and the statement cannot be a compound statement. In this example, additional code handles the error about the column that cannot be found in the InnerProc procedure. DROP PROCEDURE OuterProc; DROP PROCEDURE InnerProc; CREATE PROCEDURE OuterProc() BEGIN MESSAGE 'Hello from OuterProc.' TO CLIENT; CALL InnerProc(); MESSAGE 'SQLSTATE set to ', SQLSTATE,' in OuterProc.' TO CLIENT END; CREATE PROCEDURE InnerProc() BEGIN DECLARE column_not_found EXCEPTION FOR SQLSTATE '52003'; MESSAGE 'Hello from InnerProc.' TO CLIENT; SIGNAL column_not_found; MESSAGE 'Line following SIGNAL.' TO CLIENT; EXCEPTION WHEN column_not_found THEN MESSAGE 'Column not found handling.' TO CLIENT; WHEN OTHERS THEN RESIGN
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of http://stackoverflow.com/questions/9582885/how-to-do-error-handling-in-stored-procedure this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up error handling How to do error handling in Stored procedure up vote 3 down vote favorite I am using Sybase ASE 12.5 at the moment. I have a code below: create procedure test_launcher_fail_wrapper as begin select convert(numeric(2),1234345) if @@error != 0 begin select "SP failed to execute" return 1 end end Here, I am trying to convert a very large value/amount (1234345) to Numeric size 2. error handling in Which is not possible and it generates error. Questions: Is having @@error useful here? I ran this SP and it never went into error handling How to error handle these kind of scenarios? tsql stored-procedures error-handling sybase-ase share|improve this question edited Mar 6 '12 at 11:40 skaffman 277k63617654 asked Mar 6 '12 at 8:02 Meet Agrawal migrated from programmers.stackexchange.com Mar 6 '12 at 11:33 This question came from our site for professional programmers interested in conceptual questions about software development. Why the close votes. Its a very good and definite question with hopefully some interesting answers. SQL procedures are programs and error handling is a known problem area. –James Anderson Mar 6 '12 at 8:59 1 Belongs on stackoverflow –ammoQ Mar 6 '12 at 9:09 forgive my ignorance. But if this question belongs to different forum than can the Admin move it. Don't want to cross post. –Meet Agrawal Mar 6 '12 at 9:57 its not within a try and catch block? –jumpingcode Mar 6 '12 at 10:02 Meet - the question can be migrated. –ChrisF♦ Mar 6