SqlServer查询中使用事务

    --获取一个新的ID
    declare @newId bigint
    select @newId=MAX(ID) from BdRdRecord01

    begin tran
      if @newId< or @newId is null
      begin
         set @newId=
         insert into BdRdRecord01(ID,bRdFlag) values (@newId,)
      end
      else
      begin
         set @newId=@newId+
         insert into BdRdRecord01(ID,bRdFlag) values (@newId,)
      end

      if @newId< or @newId is null
      begin
         rollback tran  ---回滚事务
         set @newId=-
      end
      else
      begin
         commit tran    --执行事务
      end

     select @newId