SQL Server 事务嵌套

      
        DECLARE
      
      
        @TranCounter
      
      
        INT
      
      
        ;




      
      
        SET
      
      
        @TranCounter
      
      
        =
      
      
        @@TRANCOUNT
      
      
        ;


      
      
        IF
      
      
        @TranCounter
      
      
        >
      
      
        0
      
      
        --
      
      
         Procedure called when there is
      
      
        --
      
      
         an active transaction.
      
      
        --
      
      
         Create a savepoint to be able
      
      
        --
      
      
         to roll back only the work done
      
      
        --
      
      
         in the procedure if there is an
      
      
        --
      
      
         error.
      
      
        SAVE
      
      
        TRANSACTION
      
      
         ProcedureSave;


      
      
        ELSE
      
      
        --
      
      
         Procedure must start its own
      
      
        --
      
      
         transaction.
      
      
        BEGIN
      
      
        TRANSACTION
      
      
        ;


      
      
        --
      
      
         Modify database.
      
      
        BEGIN
      
      
         TRY



    
      
      
        /*
      
      
        *

        Write your T-SQL here...

    *
      
      
        */
      
      
        --
      
      
         Get here if no errors; must commit
      
      
        --
      
      
         any transaction started in the
      
      
        --
      
      
         procedure, but not commit a transaction
      
      
        --
      
      
         started before the transaction was called.
      
      
        IF
      
      
        @TranCounter
      
      
        =
      
      
        0
      
      
        --
      
      
         @TranCounter = 0 means no transaction was
      
      
        --
      
      
         started before the procedure was called.
      
      
        --
      
      
         The procedure must commit the transaction
      
      
        --
      
      
         it started.
      
      
        COMMIT
      
      
        TRANSACTION
      
      
        ;


      
      
        END
      
      
         TRY


      
      
        BEGIN
      
      
         CATCH

    
      
      
        --
      
      
         An error occurred; must determine
      
      
        --
      
      
         which type of rollback will roll
      
      
        --
      
      
         back only the work done in the
      
      
        --
      
      
         procedure.
      
      
        IF
      
      
        @TranCounter
      
      
        =
      
      
        0
      
      
        --
      
      
         Transaction started in procedure.
      
      
        --
      
      
         Roll back complete transaction.
      
      
        ROLLBACK
      
      
        TRANSACTION
      
      
        ;

    
      
      
        ELSE
      
      
        --
      
      
         Transaction started before procedure
      
      
        --
      
      
         called, do not roll back modifications
      
      
        --
      
      
         made before the procedure was called.
      
      
        IF
      
       XACT_STATE() 
      
        <>
      
      
        -
      
      
        1
      
      
        --
      
      
         If the transaction is still valid, just
      
      
        --
      
      
         roll back to the savepoint set at the
      
      
        --
      
      
         start of the stored procedure.
      
      
        ROLLBACK
      
      
        TRANSACTION
      
      
         ProcedureSave;

            
      
      
        --
      
      
         If the transaction is uncommitable, a
      
      
        --
      
      
         rollback to the savepoint is not allowed
      
      
        --
      
      
         because the savepoint rollback writes to
      
      
        --
      
      
         the log. Just return to the caller, which
      
      
        --
      
      
         should roll back the outer transaction.
      
      
        --
      
      
         After the appropriate rollback, echo error
      
      
        --
      
      
         information to the caller.
      
      
        DECLARE
      
      
        @ErrorMessage
      
      
        NVARCHAR
      
      (
      
        4000
      
      
        );

    
      
      
        DECLARE
      
      
        @ErrorSeverity
      
      
        INT
      
      
        ;

    
      
      
        DECLARE
      
      
        @ErrorState
      
      
        INT
      
      
        ;



    
      
      
        SELECT
      
      
        @ErrorMessage
      
      
        =
      
      
         ERROR_MESSAGE();

    
      
      
        SELECT
      
      
        @ErrorSeverity
      
      
        =
      
      
         ERROR_SEVERITY();

    
      
      
        SELECT
      
      
        @ErrorState
      
      
        =
      
      
         ERROR_STATE();



    
      
      
        RAISERROR
      
       (
      
        @ErrorMessage
      
      , 
      
        @ErrorSeverity
      
      , 
      
        @ErrorState
      
      
        );




      
      
        END
      
       CATCH