事务 Demo

--开始事务

begin transaction tran_bank;

declare @tran_error int;

    set @tran_error = 0;

    begin try

        update bank set totalMoney = totalMoney - 10000 where userName = 'jack';        

        set @tran_error = @tran_error + @@error;

        update bank set totalMoney = totalMoney + 10000 where userName = 'jason';

        set @tran_error = @tran_error + @@error;

    end try

    begin catch        

        print '出现异常，错误编号：' + convert(varchar, error_number()) + '， 错误消息：' + error_message(); 

        set @tran_error = @tran_error + 1;

    end catch

if (@tran_error > 0)

    begin

        --执行出错，回滚事务

        rollback tran;

        print '转账失败，取消交易';

    end

else

    begin

        --没有异常，提交事务

        commit tran;

        print '转账成功';

    end

go