SQL 游标

declare @tmpTbl Table(uid int)
declare @userid int
begin
    begin TRAN LUOFUXIAN
        INSERT INTO @tmpTbl(uid) SELECT userid FROM tbl_news 
        declare tmpCursor CURSOR
        FOR SELECT uid FROM @tmpTbl
        OPEN tmpCursor
        FETCH NEXT FROM tmpCursor into @userid
            while @@FETCH_STATUS=0
                BEGIN
                    UPDATE tbl_users set username='_'+ cast(@userid as nvarchar(255))+'_'
                        where tbl_users.id=@userid
                    FETCH NEXT FROM tmpCursor into @userid
                END
        close tmpcursor
        deallocate tmpcursor
        if(@@ERROR>0)
            BEGIN 
                ROLLBACK TRAN LUOFUXIAN
            END
    commit TRAN LUOFUXIAN
end