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It can be said that no matter what, any piece of code has the ability to fail and generate some sort of error. For the vast majority of this code, you will want to trap any error that occurs, check what the error is, and deal with it as best you can. As you saw previously, this could be done one statement at a time using @@ERROR to test for any error code. A new and improved functionality exists whereby a set of statements can try and execute, and if any statement has an error, it will be caught. This is known as a TRY...CATCH block. Surrounding code with the ability to try and execute a slice of code and to catch any errors and try to deal with them has been around for quite a number of years in languages such as C++. Gladly, we now see this within SQL Server. The syntax is pretty straightforward. There are two blocks of code. The first block, BEGIN TRY, is where there is one or more T-SQL statements that you wish to try and run. If any of statements have an error, then no further processing within that block will execute, and processing will switch to the second block, BEGIN CATCH.

TrackPersons GO EXEC sp_addrolemember 'db_ddladmin', 'sqllogin4' GO EXECUTE AS login = 'sqllogin4' The code for the second solution element is shown next It s a little lengthy, but the code is relatively easy to follow The first two statements declare the @sname local variable and assign a value to it of sqllogin3 This points the second and third solution elements at the sqllogin3 schema By changing the SET statement for @sname to a value of dbo, you can use the code with the dbo schema instead of the sqllogin3 schema An IF ELSE IF ELSE IF statement implements the core logic for the second solution element The IF clause drops the dboTrackPersons table if the @sname variable points at the dbo schema and the TrackPersons table exists in the dbo schema.

(1 row(s) affected)

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A BEGIN END block groups two statements for execution when the EXISTS operator returns a Boolean value of 1 The first ELSE IF clause performs the same kind of task as the IF clause for the TrackPersons table in the sqllogin3 schema..

BEGIN TRY { sql_statement | statement_block } END TRY BEGIN CATCH { sql_statement | statement_block } END CATCH When you generate your own error via a RAISERROR, then a bit of care has to be taken with the severity setting, as this determines how your code works within a TRY..CATCH scenario If you raise an error with a severity level of 0 to 10, then although an error is generated and will be received by the calling program, whether that is Query Editor or a program such as C#, then processing will continue without moving to the CATCH block This can be seen as a warning level Changing the severity level to 11 or above will transfer the control to the CATCH block of code.

Note Images cannot be retrieved for viewing within SQL Server. It is necessary to use some sort of graphical program or tool to display the image.

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