sql中遍历字符串

declare @idList varchar(500),    --如111,222,333,尾部加，
    @str varchar(100),
    @Id int,
    @split varchar(10)
    
set @split = ‘,‘
while(charindex(@split,@idList)<>0)  
begin  
    set @str = substring(@idList,1,charindex(@split,@idList)-1)  
    set @idList = stuff(@idList,1,charindex(@split,@idList),‘‘)  
    --字符转int 
    set @Id=cast(@str as int)
    --这里可以用int型得id做一些数据库操作
end