事物及exec

ALTER PROC [dbo].[trans]
  @num NVARCHAR(20)
  AS
  BEGIN TRANSACTION--开启事务
   SELECT * FROM trantest(TABLOCKX)
   --动态执行语句
   DECLARE @sql NVARCHAR(200),@error INT 
   SET @error=0
   PRINT ‘开始测试1‘
   --INSERT INTO trantest(num) values(@num)
   SET @sql=‘INSERT INTO trantest(num) values(@num)‘
   EXECUTE sp_executesql @sql,N‘@num nvarchar(20) ‘,@num
   SET @error=@error+@@error--接收错误号

   PRINT @error 
   IF @error=0
   BEGIN 
        PRINT ‘执行事务‘
        COMMIT TRANSACTION--事务执行
   END 
   ELSE    
   BEGIN
        PRINT ‘回滚事务‘
        ROLLBACK TRANSACTION--事务回滚
   END 
GO

CREATE PROC [dbo].[TryTrans]
  @num NVARCHAR(20)
  AS
        BEGIN TRANSACTION
          DECLARE @sql NVARCHAR(200),@error INT 
        SET @error=0
  BEGIN TRY
        --动态执行语句

        PRINT ‘开始测试1‘
        --INSERT INTO trantest(num) values(@num)
        SET @sql=‘INSERT INTO trantest(num) values(@num)‘
        EXECUTE sp_executesql @sql,N‘@num nvarchar(20) ‘,@num
        PRINT ‘异常外‘

  END TRY
  BEGIN CATCH
        PRINT ‘出现异常，错误编号：‘ + convert(varchar,error_number()) + ‘,错误消息：‘ + error_message()
        SET @error = @error + 1
  END CATCH

IF(@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