Using TRY...CATCH in T-SQL

try_catch_sample.sql

SET XACT_ABORT ON;

BEGIN TRY
    BEGIN TRANSACTION;
        -- A FOREIGN KEY constraint exists on this table. This 
        -- statement will generate a constraint violation error.
        DELETE FROM Production.Product
            WHERE ProductID = 980;

    -- If the DELETE statement succeeds, commit the transaction.
    COMMIT TRANSACTION;
END TRY
BEGIN CATCH
    -- Execute error retrieval routine.
    EXECUTE usp_GetErrorInfo;

    -- Test XACT_STATE:
        -- If 1, the transaction is committable.
        -- If -1, the transaction is uncommittable and should 
        --     be rolled back.
        -- XACT_STATE = 0 means that there is no transaction and
        --     a commit or rollback operation would generate an error.

    -- Test whether the transaction is uncommittable.
    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.
    IF (XACT_STATE()) = 1
    BEGIN
        PRINT
            N'The transaction is committable.' +
            'Committing transaction.'
        COMMIT TRANSACTION;   
    END;
END CATCH;
GO