通用数据分页类

通用分页类,以后写分页显示数据时就轻松多啦.直接调用此类,然后再Execute即可以取得当前页的所有数据.
此类所做的工作是只取得当前页的数据,和总页数和总记录数等等数据.

ASP代码:

<%
@#/*****************************分页显示类**************************
@#/* 作者：哇哇鱼
@#/* 日期：2004年11月18日
@#/* 作用：取得某一页的数据并返回给外部
@#/* 说明示例：
@#/* Dim MyPage=New PageClass
@#/* MyPage.Conn=Conn @#设置连接对象
@#/* MyPage.PageSize=20 @#设置一页显示多少条数据 (默认为10条)
@#/* MyPage.CurPage=2 @#设置当前要显示的页码
@#/*@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#
@#/* MyPage.TableName="Member" @#设置表名
@#/* MyPage.Fields="ID,MemberName,MemberPass" @#设置显示字段列表
@#/* MyPage.Condition="ID>100" @#设置查询条件
@#/* MyPage.OrderBy="ID DESC" @#设置排序条件（一定要设置该属性)
@#/* Set PageRs=MyPage.Execute @#返回当前第2页的数据(RecordSet对象)，如果出错则返回Nothing值
@#/*@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#
@#/*@#以上的定义也可以用以下的方法：ExecuteBy("表名","字段列表","查询条件","排序条件")
@#/* Set PageRs=MyPage.ExecuteBy("Member","ID,MemberName,MemberPass","ID>100","ID DESC")
@#/*@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#
@#/* PageCount=MyPage.PageCount @#返回页码总数
@#/* RecordCount=MyPage.RecordCount @#返回记录总数
@#/* NextPage=MyPage.NextPage @#返回下页的页码
@#/* PrePage=MyPage.PrePage @#返回上一页的页码
@#/*****************************************************************
Class PageClass
Private Connection @#连接数据库的外部Connection对象
Private Rs
Private List_Fields
Private Table_Name
Private Query_Where
Private OrderBy_SQL @#字段排序语句部分
Private Page_Count @#返回当前查询的记录页总数
Private Page_Size @#设置一页显示多少条的记录
Private Cur_Page @#设置当前的页码
Private Record_Count @#返回当前查询的记录总数
@#/****************设置Connection对象****************************
Public Property Let Conn(ByRef ObjConn)
Set Connection=ObjConn
End Property
Public Property Get Conn()
Set Conn=Connection
End Property
@#/****************End******************************************

@#/****************设置查询SQL语句*******************************
@#@#查询显示字段
Public Property Let Fields(ByVal Value)
List_Fields=Value
End Property
Public Property Get Fields()
Fields=List_Fields
End Property
@#@#查询表名
Public Property Let TableName(ByVal Value)
Table_Name=Value
End Property
Public Property Get TableName()
TableName=Table_Name
End Property
@#@#查询条件
Public Property Let Condition(ByVal Value)
Query_Where=Value
End Property
Public Property Get Condition()
Condition=Query_Where
End Property
@#@#*****************排序部分********************************************
@#@#Value 语不用写上Order By 。如： [object].OrderBy="ID Desc,PostTime Asc"
Public Property Let OrderBy(ByVal Value)
OrderBy_SQL=Value
End Property
Public Property Get OrderBy()
OrderBy=OrderBy_SQL
End Property
@#/****************End******************************************

@#/****************返回当前查询结果的总页数***********************
Public Property Get PageCount()
PageCount=Page_Count
End Property
Public Property Get RecordCount()
RecordCount=Record_Count
End Property
Public Property Get NextPage()
If Cur_Page<Page_Count Then
NextPage=Cur_Page+1
Else
NextPage=Page_Count
End If
End Property
Public Property Get PrePage()
If Cur_Page>1 Then
PrePage=Cur_Page-1
Else
PrePage=Cur_Page
End If
End Property
@#/****************End******************************************

@#/****************设置一页显示的记录数***************************
Public Property Let PageSize(ByVal Value)
If Not IsNumeric(Value) Or Value="" Then
Value=10
Else
Value=Cint(Value)
End If
If Value<1 Then Value=10
Page_Size=Value
End Property
Public Property Get PageSize()
PageSize=Page_Size
End Property
@#@#设置当前的页码数**************************
Public Property Let Page(ByVal Value)
If Not IsNumeric(Value) Or Value="" Then
Value=1
Else
Value=CLng(Value)
End If
If Value<1 Then Value=1
Cur_Page=Value
End Property
Public Property Get Page()
Page=Cur_Page
End Property
@#/****************End******************************************

Private Sub Class_Initialize
@#初始化RecordSet对象
Page_Size=10 @#默认一页为10条数据
CurPage=1 @#默认当前为第一页
Record_Count=0
Page_Count=0
End Sub

Private Sub Class_Terminate
Call CloseRecordSet
End Sub

@#/***关闭数据库的连接*******
Private Sub CloseRecordSet
On Error Resume Next
If IsObject(Rs) Then
Rs.Close
Set Rs=Nothing
End If
On Error Goto 0
End Sub

@#/**********执行查询返回对应页码的数据***********************************************
Public Function ExecuteBy(ByVal oTableName,ByVal oFields,ByVal oCondition,ByVal oOrderBy)
Table_Name=oTableName
List_Fields=oFields
Query_Where=oCondtion
OrderBy_SQL=oOrderBy
Set ExecuteBy=Execute()
End Function
@#查询并返回当前CurPage的页码记录
Public Function Execute()
Call CloseRecordSet
On Error Resume Next
Dim TSQL,TopMod,sWhere
If Not IsObject(Connection) Or Table_Name="" Or OrderBy_SQL="" Then
Set Execute=Nothing
Record_Count=0
Page_Count=0
Exit Function
End If
If Trim(Query_Where)<>"" Then
sWhere="Where "&Query_Where
Else
sWhere=""
End If
TSQL="Select Count(*) From ["&Table_Name&"] "&sWhere
Record_Count=Connection.Execute(TSQL)(0) @#获取记录总数
If Err Then
Err.Clear
Set Execute=Nothing
Record_Count=0
Page_Count=0
Exit Function
End If
If Record_Count<1 Then
Set Execute=Nothing
Record_Count=0
Page_Count=0
Exit Function
End If
@#取得页的总数
If Record_Count Mod Page_Size <>0 Then
TopMod=Record_Count Mod Page_Size
Page_Count=Fix(Record_Count/Page_Size)+1
If Cur_Page<Page_Count Then
TopMod=Page_Size
End If
Else
TopMod=Page_Size
Page_Count=Fix(Record_Count/Page_Size)
End If
If Cur_Page>Page_Count Then Cur_Page=Page_Count
If Cur_Page<1 Then Cur_Page=1
If Trim(List_Fields)="" Then List_Fields="*"
TSQL="Select * From (Select Top "&TopMod&" * From (Select Top "&(Cur_Page*Page_Size)&" "&List_Fields&" From ["&Table_Name&"] "&sWhere&" Order By "&OrderBy_SQL&") Order By "&TransformOrder(OrderBy_SQL)&")Order By "&OrderBy_SQL
Set Rs=Connection.Execute(TSQL)
If Err Then
Err.Clear
Set Execute=Nothing
Record_Count=0
Page_Count=0
Exit Function
End If
Set Execute=Rs
End Function

@#转换OrderBy的顺序 ASC->DESC DESC->ASC
Private Function TransformOrder(ByVal Value)
If Value="" Then
TransformOrder=""
Exit Function
End If
Dim OrderArray,i,Result,ByString,Fields,InPos
OrderArray=Split(Value,",") @#分解每个字段值
For i=0 To Ubound(OrderArray)
If OrderArray(i)<>"" Then
InPos=InStrRev(Trim(OrderArray(i))," ") @#找出排序的顺序
If InPos<1 Then @#如果找不到则是ASC排序
ByString="ASC"
Fields=OrderArray(i)+" "
Else
ByString=Trim(Mid(OrderArray(i),InPos+1))
Fields=Left(OrderArray(i),InPos)
If ByString<>"" Then
ByString=UCase(ByString)
Else
ByString="ASC"
End If
End If
@#@#转换排序
If ByString="ASC" Then
ByString="DESC"
Else
ByString="ASC"
End If
Result=Result+Fields+ByString+","
End If
Next
If Result<>"" Then Result=Left(Result,Len(Result)-1)
TransformOrder=Result
End Function
End Class
%>


示例代码:
Sub Show_List
Dim Page,PageRs
Page=Request("Page")
Dim MyPage
Set MyPage=New PageClass
MyPage.Conn=Conn
MyPage.PageSize=20
MyPage.Page=Page
@#MyPage.TableName="Movie"
@#MyPage.Fields="*"
@#MyPage.OrderBy="ID Asc"
@#Set PageRs=MyPage.Execute
Set PageRs=MyPage.ExecuteBy("Movie","*","","ID Asc")
If PageRs Is Nothing Then Exit Sub
Do Until PageRs.Eof
Response.Write " <tr bgcolor=""#FDFDFD"" style=""cursor:hand"" onmouseover=""this.style.background=@##F3F3F3@#"" onmouseout=""this.style.background=@##FDFDFD@#"">"
Response.Write " <td height=""20""><div align=""center"">"&PageRs("ID")&"</div></td>"
Response.Write " <td>"&PageRs("Name")&"</td>"
Response.Write " <td><a href="""&PageRs("URL")&"""><font color=@##000000@#>"&PageRs("URL")&"</font></a></td>"
Response.Write " <td>"&PageRs("Type")&"</td>"
Response.Write " </tr>"
PageRs.MoveNext
Loop
PageRs.Close
PageCount=MyPage.PageCount
Page=MyPage.Page @#取得当前正确的页码数
NextPage=MyPage.NextPage
PrePage=MyPage.PrePage
Set PageRs=Nothing
Set MyPage=Nothing
End Sub

原文转自：http://www.ltesting.net