在存储过程中循环表中的记录集

    DECLARE @tempFriend varchar(5000)
    DECLARE rs CURSOR  LOCAL SCROLL FOR
    select Friend  from Friend where Username = @Username
    OPEN rs 
    FETCH NEXT FROM rs INTO @tempFriend  --循环
     WHILE @@FETCH_STATUS = 0
     BEGIN
        SET @Friend = @Friend + @tempFriend
     FETCH NEXT FROM rs INTO @tempFriend
     END
     CLOSE  rs
     deallocate   rs