garethtnash
asked on
VBScript Pagination - ASP
Hello,
I'm building a site in ASP VBScript. Historically I have used the ASP Recordset to query a database, however I'm growing more aware that whilst my repeat region may only show 10 records, the recordset grabs all the data,... and that this impacts on resource use.
Therefore I've started to query the database though Stored Procedures like so -
as it will only return the number of results that I want to show on each page.
I've also taken to running a separate SP in order to return the count of all results -
Now historically, I would use a dreamweaver extension (I know...) to write the code to produce the pagination navigation at the bottom of the page, the code for this reads like -----
Server Side - where results is the recordset
and client side -
This won't work with the way I am now querying the database, I am returning rowcount and total records between my two SPs.
I'm really keen to find a way to bespoke this code so that it works with my stored procedures....
I'm assuming that my stored procedures provide all the elements needed..
Any suggestions?
Thank you
I'm building a site in ASP VBScript. Historically I have used the ASP Recordset to query a database, however I'm growing more aware that whilst my repeat region may only show 10 records, the recordset grabs all the data,... and that this impacts on resource use.
Therefore I've started to query the database though Stored Procedures like so -
CREATE PROCEDURE [dbo].[returnresults](
@offset int,
@pagecount int)
AS
BEGIN
SET NOCOUNT ON;
IF @offset is null set @offset = 1
SET @pagecount = @offset + 19
BEGIN
-- THE ROW_NUMBER CAN BE USED IN COMMON TABEL EXPRESSION
;WITH JBCTE
AS(
SELECT
ID,
Row1,
Row2
ROW_NUMBER() OVER (ORDER BY [ID] desc) AS RowNum
FROM dbo.datatable
)
SELECT ID,
Row1,
Row2
FROM JBCTE
WHERE RowNum between @offset and @pagecount
ORDER BY ID DESC
END
END
GO
as it will only return the number of results that I want to show on each page.
I've also taken to running a separate SP in order to return the count of all results -
CREATE PROCEDURE [dbo].[returnresultsCount]
AS
BEGIN
SET NOCOUNT ON;
BEGIN
-- THE ROW_NUMBER CAN BE USED IN COMMON TABEL EXPRESSION
SELECT
COUNT(ID) Results
FROM dbo.datatable
END
END
GO
Now historically, I would use a dreamweaver extension (I know...) to write the code to produce the pagination navigation at the bottom of the page, the code for this reads like -----
<%
' *** Recordset Stats, Move To Record, and Go To Record: declare stats variables
Dim results_total
Dim results_first
Dim results_last
' set the record count
results_total = results.RecordCount
' set the number of rows displayed on this page
If (results_numRows < 0) Then
results_numRows = results_total
Elseif (results_numRows = 0) Then
results_numRows = 1
End If
' set the first and last displayed record
results_first = 1
results_last = results_first + results_numRows - 1
' if we have the correct record count, check the other stats
If (results_total <> -1) Then
If (results_first > results_total) Then
results_first = results_total
End If
If (results_last > results_total) Then
results_last = results_total
End If
If (results_numRows > results_total) Then
results_numRows = results_total
End If
End If
%>
<%
' *** Recordset Stats: if we don't know the record count, manually count them
If (results_total = -1) Then
' count the total records by iterating through the recordset
results_total=0
While (Not results.EOF)
results_total = results_total + 1
results.MoveNext
Wend
' reset the cursor to the beginning
If (results.CursorType > 0) Then
results.MoveFirst
Else
results.Requery
End If
' set the number of rows displayed on this page
If (results_numRows < 0 Or results_numRows > results_total) Then
results_numRows = results_total
End If
' set the first and last displayed record
results_first = 1
results_last = results_first + results_numRows - 1
If (results_first > results_total) Then
results_first = results_total
End If
If (results_last > results_total) Then
results_last = results_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 = results
MM_rsCount = results_total
MM_size = results_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
results_first = MM_offset + 1
results_last = MM_offset + MM_size
If (MM_rsCount <> -1) Then
If (results_first > MM_rsCount) Then
results_first = MM_rsCount
End If
If (results_last > MM_rsCount) Then
results_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 In Request.Form
MM_nextItem = "&" & MM_item & "="
If (InStr(1,MM_removeList,MM_nextItem,1) = 0) Then
MM_keepForm = MM_keepForm & MM_nextItem & Server.URLencode(Request.Form(MM_item))
End If
Next
' create the Form + URL string and remove the intial '&' from each of the strings
MM_keepBoth = MM_keepURL & MM_keepForm
If (MM_keepBoth <> "") Then
MM_keepBoth = Right(MM_keepBoth, Len(MM_keepBoth) - 1)
End If
If (MM_keepURL <> "") Then
MM_keepURL = Right(MM_keepURL, Len(MM_keepURL) - 1)
End If
If (MM_keepForm <> "") Then
MM_keepForm = Right(MM_keepForm, Len(MM_keepForm) - 1)
End If
' a utility function used for adding additional parameters to these strings
Function MM_joinChar(firstItem)
If (firstItem <> "") Then
MM_joinChar = "&"
Else
MM_joinChar = ""
End If
End Function
%>
<%
' *** Move To Record: set the strings for the first, last, next, and previous links
Dim MM_keepMove
Dim MM_moveParam
Dim MM_moveFirst
Dim MM_moveLast
Dim MM_moveNext
Dim MM_movePrev
Dim MM_urlStr
Dim MM_paramList
Dim MM_paramIndex
Dim MM_nextParam
MM_keepMove = MM_keepBoth
MM_moveParam = "index"
' if the page has a repeated region, remove 'offset' from the maintained parameters
If (MM_size > 1) Then
MM_moveParam = "offset"
If (MM_keepMove <> "") Then
MM_paramList = Split(MM_keepMove, "&")
MM_keepMove = ""
For MM_paramIndex = 0 To UBound(MM_paramList)
MM_nextParam = Left(MM_paramList(MM_paramIndex), InStr(MM_paramList(MM_paramIndex),"=") - 1)
If (StrComp(MM_nextParam,MM_moveParam,1) <> 0) Then
MM_keepMove = MM_keepMove & "&" & MM_paramList(MM_paramIndex)
End If
Next
If (MM_keepMove <> "") Then
MM_keepMove = Right(MM_keepMove, Len(MM_keepMove) - 1)
End If
End If
End If
' set the strings for the move to links
If (MM_keepMove <> "") Then
MM_keepMove = Server.HTMLEncode(MM_keepMove) & "&"
End If
MM_urlStr = Request.ServerVariables("URL") & "?" & MM_keepMove & MM_moveParam & "="
MM_moveFirst = MM_urlStr & "0"
MM_moveLast = MM_urlStr & "-1"
MM_moveNext = MM_urlStr & CStr(MM_offset + MM_size)
If (MM_offset - MM_size < 0) Then
MM_movePrev = MM_urlStr & "0"
Else
MM_movePrev = MM_urlStr & CStr(MM_offset - MM_size)
End If
%>
Server Side - where results is the recordset
and client side -
<%
TFM_MiddlePages = 6
TFM_delimiter = " "
TFM_startLink = MM_offset + 1 - MM_size * (int(TFM_middlePages/2))
If MM_offset > 0 Then TFM_LimitPageEndCount = int(TFM_startLink/MM_size)
If TFM_startLink < 1 Then
TFM_startLink = 1
TFM_LimitPageEndCount = 0
End If
TFM_endLink = MM_size * TFM_MiddlePages + TFM_startLink - 1
If TFM_endLink > results_total Then TFM_endLink = results_total
For i = TFM_startLink to TFM_endLink Step MM_size
TFM_LimitPageEndCount = TFM_LimitPageEndCount + 1
if i <> MM_offset + 1 Then
Response.Write("<a href=""" & Request.ServerVariables("URL") & "?" & MM_keepMove & "offset=" & i-1 & """>")
Response.Write(TFM_LimitPageEndCount & "</a>")
else
Response.Write("<strong>")
Response.Write(TFM_LimitPageEndCount & "</strong>")
End if
if(i <= TFM_endLink - MM_size) then Response.Write(TFM_delimiter)
Next
%>
This won't work with the way I am now querying the database, I am returning rowcount and total records between my two SPs.
I'm really keen to find a way to bespoke this code so that it works with my stored procedures....
I'm assuming that my stored procedures provide all the elements needed..
Any suggestions?
Thank you
ASKER
Thanks Padas,
couple of things, i only want to display x links along the bottom, like Google, would this work?
How does the recordset work with the SP, I'm a little confused?
Thank you
couple of things, i only want to display x links along the bottom, like Google, would this work?
How does the recordset work with the SP, I'm a little confused?
Thank you
ASKER CERTIFIED SOLUTION
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ASKER
Hi Padas,
Thanks.
Sorry I probably should have explained better, the view I'm querying contains 25,000 records, and 1 of the columns returned is an nvarchar(max) column, albeit we only return the first 420 characters.
What I'm trying to avoid is the worst case scenario whereby all 25,000 are returned by the query, only to have the page only write 10 or 20 of these, as this would use a mass of resources and take forever to load, which is why I'm using a CTE, to only write x records at a time.
Which leaves me with the paging navigation..
I think editing this somehow will work --
providing that I am able to get values for -
MM_offset
MM_size
results_total
Hope that makes better sense?
Thanks for your help so far.
G
Thanks.
Sorry I probably should have explained better, the view I'm querying contains 25,000 records, and 1 of the columns returned is an nvarchar(max) column, albeit we only return the first 420 characters.
What I'm trying to avoid is the worst case scenario whereby all 25,000 are returned by the query, only to have the page only write 10 or 20 of these, as this would use a mass of resources and take forever to load, which is why I'm using a CTE, to only write x records at a time.
Which leaves me with the paging navigation..
I think editing this somehow will work --
<%
TFM_MiddlePages = 6
TFM_delimiter = " "
TFM_startLink = MM_offset + 1 - MM_size * (int(TFM_middlePages/2)) 'URL Offset +1 - number of records on page * (middlepages/2)
If MM_offset > 0 Then TFM_LimitPageEndCount = int(TFM_startLink/MM_size)
If TFM_startLink < 1 Then
TFM_startLink = 1
TFM_LimitPageEndCount = 0
End If
TFM_endLink = MM_size * TFM_MiddlePages + TFM_startLink - 1
If TFM_endLink > results_total Then TFM_endLink = results_total
For i = TFM_startLink to TFM_endLink Step MM_size
TFM_LimitPageEndCount = TFM_LimitPageEndCount + 1
if i <> MM_offset + 1 Then
Response.Write("<a href=""" & Request.ServerVariables("URL") & "?" & MM_keepMove & "offset=" & i-1 & """>")
Response.Write(TFM_LimitPageEndCount & "</a>")
else
Response.Write("<strong>")
Response.Write(TFM_LimitPageEndCount & "</strong>")
End if
if(i <= TFM_endLink - MM_size) then Response.Write(TFM_delimiter)
Next
%>
providing that I am able to get values for -
MM_offset
MM_size
results_total
Hope that makes better sense?
Thanks for your help so far.
G
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