转学用存储过程传入参数显示多行重复记录的实现过程！

create table bb(aid int,aname char(1),acom char(1))-------- 建测试表


go


insert bb ---------------------插入记录


select 1,'a','d' union all


select 2,'b','c' union all


select 3,'k','s'


go


select *


from bb


go


create proc ReturnN(@n int) ---------------转入参数


as


begin-------------------------------------------------------------------------------------模块


declare @sql varchar(8000) ------------- SQL字符串


declare @b int ---------CIRCLE参数


set @b=0--------------从0开始


set @sql=''


while @b<@n ----------<@n,输出多条


begin





set @sql=@sql+'select * from bb where AID='+cast(@n as varchar(10))+' union all ' -----------加入 union all, 太妙了


set @b =@b+1 ---------- 累加


end


set @sql=substring(@sql,1,len(@sql)-len(' union all ')) -------------------加这个条件，为了去除语句字符串的最后union all


print @sql ---------显式调试打印动态SQL语句


exec(@sql) ---------- 一定要加入这 exec(@sql)


end----------------------------------------------------------------------------------------------模块


go


exec returnN 2--------调用


------------------------


aid aname acom


-----------------------


2 b c


2 b c