How do I implement pagination in SQL for MS Access? - sql

Question

I'm accessing a Microsoft Access 2002 database (MDB) using ASP.NET through the OdbcConnection class, which works quite well albeit very slowly.
My question is about how to implement pagination in SQL for queries to this database, as I know I can implement the TOP clause as:
SELECT TOP 15 *
FROM table
but I am unable to find a way to limit this to an offset as can be done with SQL Server using ROWNUMBER. My best attempt was:
SELECT ClientCode,
(SELECT COUNT(c2.ClientCode)
FROM tblClient AS c2
WHERE c2.ClientCode <= c1.ClientCode)
AS rownumber
FROM tblClient AS c1
WHERE rownumber BETWEEN 0 AND 15
which fails with:
Error Source: Microsoft JET Database Engine
Error Message: No value given for one or more required parameters.
I can't work out this error, but I'm assuming it has something to do with the sub-query that determines a rownumber?
Any help would be appreciated with this; my searches on google have yielded unhelpful results :(

Answer 1

If you wish to apply paging in MS Acces use this
SELECT *
FROM (
SELECT Top 5 sub.ClientCode
FROM (
SELECT TOP 15 tblClient.ClientCode
FROM tblClient
ORDER BY tblClient.ClientCode
) sub
ORDER BY sub.ClientCode DESC
) subOrdered
ORDER BY subOrdered.ClientCode
Where 15 is the StartPos + PageSize, and 5 is the PageSize.
EDIT to comment:
The error you are receiving, is because you are trying to reference a column name assign in the same level of the query, namely rownumber. If you were to change your query to:
SELECT *
FROM (
SELECT ClientCode,
(SELECT COUNT(c2.ClientCode)
FROM tblClient AS c2
WHERE c2.ClientCode <= c1.ClientCode) AS rownumber
FROM tblClient AS c1
)
WHERE rownumber BETWEEN 0 AND 15
It should not give you an error, but i dont think that this is the paging result you want.

Answer 2

See astander's answer for the original answer, but here's my final implementation that takes into account some ODBC parser rules (for the first 15 records after skipping 30):
SELECT *
FROM (
SELECT Top 15 -- = PageSize
*
FROM
(
SELECT TOP 45 -- = StartPos + PageSize
*
FROM tblClient
ORDER BY Client
) AS sub1
ORDER BY sub1.Client DESC
) AS clients
ORDER BY Client
The difference here is that I need the pagination to work when sorted by client name, and I need all columns (well, actually just a subset, but I sort that out in the outer-most query).

Answer 3

I use this SQL code to implement the pagination with Access
Select TOP Row_Per_Page * From [
Select TOP (TotRows - ((Page_Number - 1) * Row_Per_Page)
From SampleTable Order By ColumnName DESC
] Order By ColumnName ASC
I've published an article with some screenshots
on my blog

Answer 4

This is the simple method of pagination using OleDbDataAdapter and Datatable classes. I am using a different SQL command for simplicity.
Dim sSQL As String = "select Name, Id from Customer order by Id"
Dim pageNumber As Integer = 1
Dim nTop As Integer = 20
Dim nSkip As Integer = 0
Dim bContinue As Boolean = True
Dim dtData as new Datatable
Do While bContinue
dtData = GetData(sSQL, nTop, nSkip, ConnectionString)
nSkip = pageNumber * nTop
pageNumber = pageNumber + 1
bContinue = dtData.Rows.Count > 0
If bContinue Then
For Each dr As DataRow In dtData.Rows
'do your work here
Next
End If
Loop
Here is the GetData Function.
Private Function GetData(ByVal sql As String, ByVal RecordsToFetch As Integer, ByVal StartFrom As Integer, ByVal BackEndTableConnection As String) As DataTable
Dim dtResult As New DataTable
Try
Using conn As New OleDb.OleDbConnection(BackEndTableConnection)
conn.Open()
Using cmd As New OleDb.OleDbCommand
cmd.Connection = conn
cmd.CommandText = sql
Using da As New OleDb.OleDbDataAdapter(cmd)
If RecordsToFetch > 0 Then
da.Fill(StartFrom, RecordsToFetch, dtResult)
Else
da.Fill(dtResult)
End If
End Using
End Using
End Using
Catch ex As Exception
End Try
Return dtResult
End Function
The above codes will return 10 rows from the table Customer each time the loop operate till the end of file.

Answer 5

One easy way to use limit or get pagination working in access is to use ADODB library which support pagination for many DBs with same syntax. http://phplens.com/lens/adodb/docs-adodb.htm#ex8
Its easy to modify/override pager class to fetch required number of rows in array format then.

Answer 6

SELECT *
FROM BS_FOTOS AS TBL1
WHERE ((((select COUNT(ID) AS DD FROM BS_FOTOS AS TBL2 WHERE TBL2.ID<=TBL1.ID)) BETWEEN 10 AND 15 ));
Its result 10 to 15 records only.