关于bigeagle的树状结构存储过程的一点看法
CREATE proc up_TopicList
@a_ForumID int , @a_intPageNo int , @a_intPageSize tinyint
as
declare @m_intRecordNumber int
declare @m_intStartRecord int
declare @m_intRootID int
select @m_intRecordNumber = @a_intPageSize * @a_intPageNo
select @m_intStartRecord = @a_intPageSize * (@a_intPageNo - 1) + 1
/*求符合条件记录数*/
select "RecordCount" = count(*)
from BBS where Layer=1 and ForumID = @a_ForumID
/*输出纪录*/
/*首先定义可滚动光标*/
set rowcount @m_intRecordNumber
declare m_curTemp Scroll cursor
for
select ''rootID''=a.rootID
from BBS as a
join BBSUser as d on a.UserID = d.[ID]
where a.Layer=1 and a.ForumID = @a_ForumID
order by RootID desc , Layer , PostTime desc
open m_curTemp
fetch absolute @m_intStartRecord from m_curTemp into @m_intRootID
while (@@fetch_status = 0)
begin
select ''ID'' = a.[ID] ,
''Title'' = a.Title ,
''UserName'' = d.UserName ,
''Hits'' = a.Hits,
''Face'' = a.Face ,
''Layer''=a.Layer,
''ContentSize'' = datalength(a.Content) ,
''TotalChilds'' = (select sum(TotalChilds)
from BBS as b
where a.RootID = b.RootID) ,
''LastReplyTime'' = a.PostTime
from BBS as a
join BBSUser as d on a.UserID = d.[ID]
where a.Layer>=1 and a.ForumID = @a_ForumID and a.rootID=@m_intRootID
order by RootID desc , Layer , PostTime desc
fetch next from m_curTemp into @m_intRootID
end
set rowcount 0
/*清场*/
CLOSE m_curTemp
DEALLOCATE m_curTemp
GO
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