GOTO statements can be used to jump to a label inside the same TRY or CATCH block or to leave a TRY or CATCH block.The TRY…CATCH construct cannot be used in Copy BEGIN TRY -- Generate a divide-by-zero error. It is also important to communicate that an error has occurred, lest that the user thinks that the operation went fine, when your code in fact performed nothing at all. IF (XACT_STATE()) = -1 BEGIN PRINT N'The transaction is in an uncommittable state.' + 'Rolling back transaction.' ROLLBACK TRANSACTION; END; -- Test whether the transaction is committable.
That's basically all you need to do to create a stored procedure that contains a TRY…CATCH block. In this example I show how I implement error checking in a stored procedure that creates a temp table, performs some manipulation on the temp table, calls another stored procedure, and But for some reason, this error is not raised when the procedure is invoked from a trigger. (It is documented in Books Online, so it is not a bug.) This could SELECT 1/0; END TRY BEGIN CATCH SELECT ERROR_NUMBER() AS ErrorNumber ,ERROR_SEVERITY() AS ErrorSeverity ,ERROR_STATE() AS ErrorState ,ERROR_PROCEDURE() AS ErrorProcedure ,ERROR_MESSAGE() AS ErrorMessage; END CATCH; GO See AlsoTHROW (Transact-SQL)Database Engine Error SeveritiesERROR_LINE https://msdn.microsoft.com/en-us/library/ms175976.aspx
I've read about the TRY...CATCH (Transact-SQL) syntax, so don't just post some summary of that. Overall, it is a good recommendation to validate your input data, and raise an error if data is something your code does not handle. You may be bewildered by the complex expression. Three Ways to Reraise the Error Using error_handler_sp We have seen error_message(), which returns the text for an error message.
SELECT @err = @@error IF @err <> 0 RETURN @err EXEC @err = some_other_sp @value OUTPUT SELECT @err = coalesce(nullif(@err, 0), @@error) IF @err <> 0 BEGIN ROLLBACK TRANSACTION RETURN @err For the example, I will use this simple table. more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed Sql Try Catch Throw As I noted in the previous section, I suggest that you always have a ROLLBACK TRANSACTION if a call to a stored procedure results in error.
Dejan Sunderic is currently working as the principal consultant for the Toronto-based Trigon Blue, Inc. Error Handling In Sql Server 2012 FROM ... That is, you settle on something short and simple and then use it all over the place without giving it much thinking. https://www.simple-talk.com/sql/database-administration/handling-errors-in-sql-server-2012/ SET XACT_ABORT ON revisited One way to make your error handling simpler is to run with SET XACT_ABORT ON.
SELECT INTO. Sql Server Try Catch Transaction Listing 3 shows the script I used to create the procedure. This -- statement will generate a constraint violation error. That is the autocommit mode.
For your specific use case you don't need INSERT ... The final RETURN statement is a safeguard. Sql Server Stored Procedure Error Handling Best Practices Have addtional technical questions? Try Catch In Sql Server Stored Procedure SELECT @err = @@error IF @err <> 0 RETURN @err UPDATE #temp SET ...
SELECT 1/0; END TRY BEGIN CATCH SELECT ERROR_NUMBER() AS ErrorNumber ,ERROR_SEVERITY() AS ErrorSeverity ,ERROR_STATE() AS ErrorState ,ERROR_PROCEDURE() AS ErrorProcedure ,ERROR_LINE() AS ErrorLine ,ERROR_MESSAGE() AS ErrorMessage; END CATCH; GO B. The procedure, UpdateSales, modifies the value in the SalesLastYear column in the LastYearSales table for a specified salesperson. Suite 300 Houston TX 77379 USA Voice+1 (832) 717-4445 Fax+1 (832) 717-4460 Email: [email protected] Tutorials DBA Dev BI Career Categories Events Whitepapers Today'sTip Join Tutorials DBA Dev BI Categories Events What do you call someone without a nationality? Error Handling In Sql Server 2008
Even if XACT_ABORT is ON, as a minimum you must check for errors when calling stored procedures, and when you invoke dynamic SQL. SELECT is not on this list. A more coherent (religious) solution Lets try to develop a generic, yet comprehensive solution for error handling in T-SQL. A simple strategy is to abort execution or at least revert to a point where we know that we have full control.
Consider this very stupid example: CREATE TABLE stray_trans_demo (a int NOT NULL) go CREATE PROCEDURE start_trans AS BEGIN TRANSACTION go CREATE TRIGGER stray_trans_trigger ON stray_trans_demo FOR INSERT AS EXEC start_trans go Raise Error Sql The checking for the stored procedure is on two lines, though, since else that line would be very long. DELETE FROM Production.Product WHERE ProductID = 980; -- If the DELETE statement succeeds, commit the transaction.
XACT_ABORT ON will cause failures in an INSERT, UPDATE, or DELETE statement to abort the transaction. IF @mode NOT IN ('A', 'B', 'C') BEGIN RAISERROR('Illegal value "%s" passed for @mode.', 16, -1, @mode) RETURN 50000 END INSERT #temp (...) SELECT ... This is where the careful use or the RETURN statement comes in: If you get a non-zero value back from a stored procedure, this indicates that an error occurred in that Exception Handling In Stored Procedure In Sql Server 2012 Alternatively, the stored procedures or triggers can contain their own TRY…CATCH constructs to handle errors generated by their code.
Any time an unexpected error occurs, a stored procedure should stop further processing. This can happen either because there is a BEGIN TRANSACTION without a matching COMMIT or ROLLBACK TRANSACTION being executed, or because an error causes SQL Server to abort execution of the SELECT ... Cannot insert duplicate key in object 'dbo.sometable'.
Nor will the batch be aborted because of a RAISERROR, so if you detect an error condition, you still need to return a non-zero value to the caller, that has to