dreamweaverMX通用分页代码研究

王朝html/css/js·作者佚名  2006-12-16
窄屏简体版  字體: |||超大  

我在以前做网页的分页时候都是用自己写的服务端脚本(我从不用ADO的分页),用了MX后发现在这里面用分页太方便了,不过代码也有点太长了,大家看下面的代码就可以知道。用过之后我发现里面recordset 的cursortype设为0分页竟然可以正常工作!这令我吃惊不少,分析了代码之后才发现MX 是用了一种挺笨的方法实现的,效率很低,所以大家还是用1吧:)

分析如下:

<%@LANGUAGE="VBSCRIPT" CODEPAGE="936"%>

<!--#include file="Connections/ncarcnn.asp" -->

<%

Dim Recordset1

Dim Recordset1_numRows

Set Recordset1 = Server.CreateObject("ADODB.Recordset")

Recordset1.ActiveConnection = MM_ncarcnn_STRING

Recordset1.Source = "SELECT * FROM dbo.ncarinfo"

Recordset1.CursorType = 0

'这里用0也可以正常运行,但是经过分析代码可以看出,用0的效率很低,建议用1

Recordset1.CursorLocation = 2

Recordset1.LockType = 1

Recordset1.Open()

Recordset1_numRows = 0

%>

<%

'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

'以下为分页代码

Dim Repeat1__numRows

Dim Repeat1__index

Repeat1__numRows = 10

Repeat1__index = 0

Recordset1_numRows = Recordset1_numRows + Repeat1__numRows

%>

<%

' *** Recordset状态, 定义状态变量

Dim Recordset1_total

Dim Recordset1_first

Dim Recordset1_last

' set the record count

Recordset1_total = Recordset1.RecordCount

' set the number of rows displayed on this page

If (Recordset1_numRows < 0) Then

Recordset1_numRows = Recordset1_total

Elseif (Recordset1_numRows = 0) Then

Recordset1_numRows = 1

End If

' set the first and last displayed record

Recordset1_first = 1

Recordset1_last = Recordset1_first + Recordset1_numRows - 1

' if we have the correct record count, check the other stats 处理正确的rs

If (Recordset1_total <> -1) Then

If (Recordset1_first > Recordset1_total) Then

Recordset1_first = Recordset1_total

End If

If (Recordset1_last > Recordset1_total) Then

Recordset1_last = Recordset1_total

End If

If (Recordset1_numRows > Recordset1_total) Then

Recordset1_numRows = Recordset1_total

End If

End If

%>

<%

' *** Recordset Stats: if we don't know the record count, manually count them处理错误的RS

If (Recordset1_total = -1) Then

' count the total records by iterating through the recordset

Recordset1_total=0

While (Not Recordset1.EOF)

Recordset1_total = Recordset1_total + 1

Recordset1.MoveNext

Wend

' reset the cursor to the beginning

If (Recordset1.CursorType > 0) Then

Recordset1.MoveFirst

Else

Recordset1.Requery

End If

' set the number of rows displayed on this page

If (Recordset1_numRows < 0 Or Recordset1_numRows > Recordset1_total) Then

Recordset1_numRows = Recordset1_total

End If

' set the first and last displayed record

Recordset1_first = 1

Recordset1_last = Recordset1_first + Recordset1_numRows - 1

If (Recordset1_first > Recordset1_total) Then

Recordset1_first = Recordset1_total

End If

If (Recordset1_last > Recordset1_total) Then

Recordset1_last = Recordset1_total

End If

End If

%>

<%

Dim MM_paramName

%>

<%

' *** Move To Record and Go To Record: declare variables

Dim MM_rs

Dim MM_rsCount

Dim MM_size

Dim MM_uniqueCol

Dim MM_offset

Dim MM_atTotal

Dim MM_paramIsDefined

Dim MM_param

Dim MM_index

Set MM_rs = Recordset1

MM_rsCount = Recordset1_total

MM_size = Recordset1_numRows

MM_uniqueCol = ""

MM_paramName = ""

MM_offset = 0

MM_atTotal = false

MM_paramIsDefined = false

If (MM_paramName <> "") Then

MM_paramIsDefined = (Request.QueryString(MM_paramName) <> "")

End If

%>

<%

' *** Move To Record: handle 'index' or 'offset' parameter

if (Not MM_paramIsDefined And MM_rsCount <> 0) then

' use index parameter if defined, otherwise use offset parameter

MM_param = Request.QueryString("index")

If (MM_param = "") Then

MM_param = Request.QueryString("offset")

End If

If (MM_param <> "") Then

MM_offset = Int(MM_param)

End If

' if we have a record count, check if we are past the end of the recordset

If (MM_rsCount <> -1) Then

If (MM_offset >= MM_rsCount Or MM_offset = -1) Then ' past end or move last

If ((MM_rsCount Mod MM_size) > 0) Then ' last page not a full repeat region

MM_offset = MM_rsCount - (MM_rsCount Mod MM_size)

Else

MM_offset = MM_rsCount - MM_size

End If

End If

End If

' move the cursor to the selected record

MM_index = 0

While ((Not MM_rs.EOF) And (MM_index < MM_offset Or MM_offset = -1))

MM_rs.MoveNext

MM_index = MM_index + 1

Wend

If (MM_rs.EOF) Then

MM_offset = MM_index ' set MM_offset to the last possible record

End If

End If

%>

<%

' *** Move To Record: if we dont know the record count, check the display range

If (MM_rsCount = -1) Then

' walk to the end of the display range for this page

MM_index = MM_offset

While (Not MM_rs.EOF And (MM_size < 0 Or MM_index < MM_offset + MM_size))

MM_rs.MoveNext

MM_index = MM_index + 1

Wend

' if we walked off the end of the recordset, set MM_rsCount and MM_size

If (MM_rs.EOF) Then

MM_rsCount = MM_index

If (MM_size < 0 Or MM_size > MM_rsCount) Then

MM_size = MM_rsCount

End If

End If

' if we walked off the end, set the offset based on page size

If (MM_rs.EOF And Not MM_paramIsDefined) Then

If (MM_offset > MM_rsCount - MM_size Or MM_offset = -1) Then

If ((MM_rsCount Mod MM_size) > 0) Then

MM_offset = MM_rsCount - (MM_rsCount Mod MM_size)

Else

MM_offset = MM_rsCount - MM_size

End If

End If

End If

||||||' reset the cursor to the beginning

If (MM_rs.CursorType > 0) Then

MM_rs.MoveFirst

Else

MM_rs.Requery

End If

' move the cursor to the selected record

MM_index = 0

While (Not MM_rs.EOF And MM_index < MM_offset)

MM_rs.MoveNext

MM_index = MM_index + 1

Wend

End If

%>

<%

' *** Move To Record: update recordset stats

' set the first and last displayed record

Recordset1_first = MM_offset + 1

Recordset1_last = MM_offset + MM_size

If (MM_rsCount <> -1) Then

If (Recordset1_first > MM_rsCount) Then

Recordset1_first = MM_rsCount

End If

If (Recordset1_last > MM_rsCount) Then

Recordset1_last = MM_rsCount

End If

End If

' set the boolean used by hide region to check if we are on the last record

MM_atTotal = (MM_rsCount <> -1 And MM_offset + MM_size >= MM_rsCount)

%>

<%

' *** Go To Record and Move To Record: create strings for maintaining URL and Form parameters

Dim MM_keepNone

Dim MM_keepURL

Dim MM_keepForm

Dim MM_keepBoth

Dim MM_removeList

Dim MM_item

Dim MM_nextItem

' create the list of parameters which should not be maintained

MM_removeList = "&index="

If (MM_paramName <> "") Then

MM_removeList = MM_removeList & "&" & MM_paramName & "="

End If

MM_keepURL=""

MM_keepForm=""

MM_keepBoth=""

MM_keepNone=""

' add the URL parameters to the MM_keepURL string

For Each MM_item In Request.QueryString

MM_nextItem = "&" & MM_item & "="

If (InStr(1,MM_removeList,MM_nextItem,1) = 0) Then

MM_keepURL = MM_keepURL & MM_nextItem & Server.URLencode(Request.QueryString(MM_item))

End If

Next

' add the Form variables to the MM_keepForm string

For Each MM_item

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