sql会话

alter PROCEDURE [BAD_GET_BASE_INFO]
 @unit int,
 @billno varchar(30)
 AS
 SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
declare @count int
 IF(@unit>0)
 SELECT @count=count() FROM bad WHERE unit=@unit
 else
 SELECT @count=count() FROM bad WHERE unit=(SELECT top 1 unit FROM b_tyd WHERE billno=@billno)
IF(@count>0)
 begin
 declare @s varchar(1000)
 set @s='运单号为%d(货号为%s)的运单已经登记过货损信息了！'+char(13)+char(10)+'如果需要修改，请在营运中心-异常登记中处理!'
 raiserror(@s,16,1,@unit,@billno)
 end
 else
 begin
 IF(@billno='' or (@unit <> 0 AND @billno <> '')) --按运单号
 SELECT unit,billno,product,qty,package,billdate, bsite,esite,shipper,consignee, accdeclare,accsafe FROM b_tyd WHERE unit=@unit
 IF(@unit=0) --按货号
    SELECT  unit,billno,product,qty,package,billdate, bsite,esite,shipper,consignee, accdeclare,accsafe  FROM b_tyd  WHERE  billno=@billno

end