sql 简单事务例子

   BEGIN TRY    
        BEGIN TRAN
        IF(@HandleType=1)
        BEGIN
            UPDATE table SET ...
        END
        ELSE
        BEGIN
            UPDATE table SET ...
            UPDATE table SET ...
        END
        COMMIT TRAN
   END TRY
   BEGIN CATCH
    ROLLBACK TRAN
     RAISERROR(N‘更新失败‘,16,1)
   END CATCH