浅谈ACCESS数据库技术的2种分页核心思想

程序员文章站 2022-05-20 11:25:32

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access分页技术思想 A：程序代码 select top 分页数 * from 表 where 主键 not in (select top 第几页*分页数主键 from 表 where 过滤条件) ACCESS分页技术思想 B：程序代码 select top 页大小 * from 表1 where 主键 (select min(主键) from (select

access分页技术思想A：

程序代码
select top 分页数 * from 表 where 主键 not in (select top 第几页*分页数主键 from 表 where 过滤条件)

ACCESS分页技术思想B：

程序代码
select top 页大小 * from 表1 where 主键

相比这两种设计思想，就大容量的数据而言，譬如一表几万条数据的显示的时候，就能明显的感觉出，前者比后者快了，因为前者不用建立后台临时表处理！，少了一个环节！不过简单的说，还是很容易理解的

打个比方，我一页要五行数据，现在是第三页，那么第几页应该等于需要要的页数乘以记录！

一个基于此思路的分页函数应用：

程序代码

Function ShowClass(page, Fcount, order, desc)
if page = "" or len(page) = 0 then page = 1

SkinStr = ""
pageStr = ""
SkinTatol = conn.execute("select count(*) from Skin")(0)

Filtwheres = "order by "&order" "&desc

if page > 1 then
SkinSQL = "select top "& Fcount " Skin_ID,Skin_Name,Skin_Designer,Skin_PubDate,Skin_DesignerURL,Skin_DesignerMail,Skin_Geterip,Skin_GetTime,LocalSkinInfoPReview,Skin_RandromNumber,Skin_DownCouns,Skin_FromURL from Skin where Skin_ID not in (select top "& ((page -1)* Fcount)" Skin_ID from Skin "&Filtwheres") " & Filtwheres
else
SkinSQL = "select top "& Fcount " Skin_ID,Skin_Name,Skin_Designer,Skin_PubDate,Skin_DesignerURL,Skin_DesignerMail,Skin_GeterIP,Skin_GetTime,LocalSkinInfoPreview,Skin_RandromNumber,Skin_DownCouns,Skin_FromURL from Skin " & Filtwheres
end if

'------------------ www.knowsky.com 分页栏 ---------------------
total = SkinTatol '取总数
per = Fcount '每页显示条数
pages = total / per '总共的页数

If pages int(pages) then
pages = int(pages) + 1
Else
pages = pages
End If

If (page * per) >= total then
bn = total
Else
bn = page * per
End If

if pages if page > 5 then
a = page - 4
b = page + 4
if b > pages then b = pages
else
a = 1
b = pages
end if
else
if page > 5 then
a = page - 4
b = page + 4
if b > pages then b = pages
else
a = 1
b = 9
end if
end if

'------------- start --------------------
pageStr = pageStr & "

"
pageStr = pageStr & ""

For i = a to b
if page = i then
pageStr = pageStr & ""
else
pageStr = pageStr & ""
end if
Next

pageStr = pageStr & ""
pageStr = pageStr & "

" & i & "

"
'------------- end --------------------

set SkinDB = conn.execute(SkinSQL)
if SkinDB.bof or SkinDB.eof then
SkinStr = SkinStr & "none"
else
web_len = 1
SkinStr = SkinStr & ""
do while not SkinDB.eof
if web_len mod 4 = 0 then
Bleft = ""
Bright = ""
elseif web_len mod 4 = 1 then
Bleft = ""
Bright = ""
else
Bleft = ""
Bright = ""
end if
SkinStr = SkinStr & Bleft & "" & Bright
web_len = web_len + 1
SkinDB.movenext
loop
SkinStr = SkinStr & "

"&SkinDB("Skin_Name")"