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BEGIN TRAN INSERT Production.Location (Name, CostRate, Availability) VALUES ('Tool Verification', 0.00, 0.00) SELECT @ErrorNBR = @@ERROR IF @ErrorNBR <> 0 GOTO UndoTran INSERT Production.Location (Name, CostRate, Availability) VALUES ('Frame Forming', 0.00, 0.00) SELECT @ErrorNBR = @@ERROR IF @ErrorNBR <> 0 GOTO UndoTran COMMIT TRAN UndoTran: IF @ErrorNBR <> 0 BEGIN PRINT CAST(@ErrorNBR as varchar(6)) + ' occurred after an attempt to insert into Production.Location' ROLLBACK TRAN END This returns: (1 row(s) affected) Msg 2601, Level 14, State 1, Line 17 Cannot insert duplicate key row in object 'Production.Location' with unique index 'AK_Location_Name'. The statement has been terminated. 2601 occurred after an attempt to insert into Production.Location

Hallo, Welt!

The first example in this recipe demonstrated an error trapping method used pre-SQL Server 2005. The first line of code created an integer variable to hold the value of @@ERRORNBR after each statement was executed. @@ERRORNBR s value changes after each statement s execution, so a local variable will allow you to retain the original value of the error number: DECLARE @ErrorNBR int Next, a transaction was begun: BEGIN TRAN Two inserts were attempted against the Production.Location table. The first inserted a value that doesn t already exist in the table, and therefore succeeds: INSERT Production.Location (Name, CostRate, Availability) VALUES

With a little command-line or Makefile magic, deftly implemented macros, and the -D and -U options, you can enable and disable program features without having to edit your code simply by enabling and disabling preprocessor macros when you recompile a program. Of course, overuse of #ifdef...#endif blocks in code can make the code unreadable, so use them sparingly.

Immediately after this insert, the value of @@ERROR is captured and stored in @ErrorNBR: SELECT @ErrorNBR = @@ERROR Since the insert succeeded, the value is 0. Had the insert failed, the value would have been equal to the appropriate error message ID as found in sys.messages. Next, an IF statement evaluates the local variable value, and since it is 0, it does not invoke the IF condition: IF @ErrorNBR <> 0 GOTO UndoTran Another insert is then attempted, this time using a location name that already exists in the table. This insert fails this time, due to a unique constraint on the location name: INSERT Production.Location (Name, CostRate, Availability) VALUES ('Frame Forming', 0.00, 0.00) The error trapping logic from the first insert is repeated for the second insert, and when executed, the GOTO section was invoked since the value of @ErrorNBR is no longer equal to 0: SELECT @ErrorNBR = @@ERROR IF @ErrorNBR <> 0 GOTO UndoTran Because the GOTO command is invoked, the COMMIT TRAN was skipped: COMMIT TRAN The UndoTran label code prints the error number and a message and rolls back the transaction: UndoTran: IF @ErrorNBR <> 0 BEGIN PRINT CAST(@ErrorNBR as varchar(6)) + ' occurred after an attempt to insert into Production.Location' ROLLBACK TRAN END It s clear from this example that this method requires repetitive code to trap possible errors for each and every statement. For larger procedures or batch scripts, this can significantly increase the amount of Transact-SQL code required in order to achieve statement-level error trapping.

If the ImageMagick installation was done from a binary package, then the following search order is used, where the environment variable MAGICK_HOME should have been set to the location of the ImageMagick installation: 1. The location defined by the MAGICK_CONFIGURE_PATH environment variable (see the Using Environment Variables section) 2. $MAGICK_HOME/lib/ImageMagick-6.2.3/config 3. $MAGICK_HOME /share/ImageMagick-6.2.3/config 4. $MAGICK_HOME /share/ImageMagick-6.2.3 5. A folder named .magick in the current user s home directory 6. A folder in the client path with the name lib/ImageMagick-6.2.3 7. The current directory

In this recipe, I ll demonstrate the same error handling functionality, this time using TRY...CATCH: BEGIN TRY BEGIN TRAN INSERT Production.Location (Name, CostRate, Availability) VALUES ('Tool Verification', 0.00, 0.00) INSERT Production.Location (Name, CostRate, Availability) VALUES

Using a construct like #if 0...#endif provides a convenient way to comment out huge blocks of code without using the relevant programming language comment characters. Many languages do not support nested comments, most notably C and C++, which can make it tricky to comment out blocks of code that already contain comments. The #if 0...#endif construct is a slick way to work around this temporarily. By the way, remember to insert a comment at the beginning of the block explaining what you are doing.

COMMIT TRANSACTION END TRY BEGIN CATCH SELECT ERROR_NUMBER() ErrorNBR, ERROR_SEVERITY() Severity, ERROR_LINE () ErrorLine, ERROR_MESSAGE() Msg ROLLBACK TRANSACTION END CATCH This returns the following results: ErrorNBR Severity ErrorLine Msg 2601 14 5 Cannot insert duplicate key row in object 'Production.Location' with unique index 'AK_Location_Name'.