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="table1"
- MyPage.Fields="*"
- MyPage.OrderBy="ID Asc"
- Set PageRs=MyPage.Execute
- 'Set PageRs=MyPage.ExecuteBy("table1","*","","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("aaaa")&"</td>"
- Response.Write " <td><a href="""&PageRs("bbbb")&"""><font color='#000000'>"&PageRs("bbbb")&"</font></a></td>"
- Response.Write " <td>"&PageRs("cccc")&"</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
- Show_List
- %>