Returning n rows, setting start row, total number of rows
Hi,
I'm try to find out how ado.net can perform some of the things i am able to do in ado. Here is the scenario:
I will be searching a table that may have 1000's of rows. I want to be able to dictate how many rows (page size) to return and what the starting row number is and be able to find out how many total rows would be returned by the query.
Using old ado recordsets I was able to get the recordset and get the count or all the rows (.recordcount - ormaybe it was .rowcount) and then jump to the starting position (.absoluteposition).
How can I do the equivalent in .net? From looking at the sqldatareader it is a forward only cursor which is not going to help and the DataSet while it can start at a partilcular row how and tell it the number of rows to return how do I find out what the total number of rows that actually match the search criteria?
Thanks for any help.
eg
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eg
11/8/2002 4:04:46 AM
asp.net.object-datasource
16182 articles. 
0 followers.
6 Replies
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Here is an article that might help...
http://www.codeproject.com/aspnet/dspaging.asp
http://www.heliosfx.com
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mxmissile
11/8/2002 3:29:44 PM
I have read the article and have an issue with it.
The code reads all the records into the dataset table and then implements paging. This may be ok for say 500 records but if there are 1000's then probably not. I have not been able to find any information on how the dataset manages database cursors. I assume it is client side as the ds is a standalone data store so reading 1000's records at a time is not a good idea.
It would appear that the most efficient way when using the DataSet would be to specify a start row and a page size in the .fill method (assuming the size of resultset can't be contolled via sql) and you get the number of records back that will be on a page
da.fill(ds, nStart, nPageSize)
but it still leaves the issue of how many total rows match the criteria. It looks like I would have to do a separate "count" sql statement before or after to get the total records.
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eg
11/8/2002 4:54:19 PM
Hi,
I read through this issue, and the article posted as a help, but my problem seems slightly different (or maybe not).
I have a recordset of thousands of records, in which I want to allow a search for a particular Key value. (In the current case : in the users table, one particular UserID). I have a datagrid control that got a set pagelength of 10 records. Now, I want to find out what my pageindex should be, in order for the searched record to be displayed.
Public Function FindRec(ByVal MyTable As String, ByVal myKeyColumns As String, ByVal
MyFindString As String, ByVal MyConnectionString As String) As Long
Dim DS As DataSet
Dim sSQL As String
Dim r As DataRow
Dim i As Integer
Dim Keys() As String = Split(myKeyColumns, ";")
sSQL = "select * from " & MyTable
DS = GetData(MyConnectionString, sSQL)
With DS.Tables(0)
Dim arrPrimaryKey(UBound(Keys)) As DataColumn
For i = 0 To UBound(Keys) - 1
Dim myDataColumn As DataColumn = .Columns(Keys(i))
arrPrimaryKey(i) = myDataColumn
Next i
.PrimaryKey = arrPrimaryKey
r = .Rows.Find(MyFindString)
'Findrec= this should be the "absoluteposition" of the found row
End With
End Function
This Findrec value would then enable me to set the pageindex of my grid...
However, I can't seem to find the appropriate syntax to find the position of row r within Table 0 of my DataSet object
NOTE : GetData is another public function I use constantly
Public Function GetData(ByVal sConn As String, ByVal sSQL As String) As DataSet
Dim mySQLConnection As New SqlConnection(sConn)
Dim MySQLCommand As New SqlCommand(sSQL, mySQLConnection)
Dim MyDataAdapter As New SqlDataAdapter(MySQLCommand)
Dim MyDataSet As New DataSet()
DefaultErrorMsg = "No Error"
Try
mySQLConnection.Open()
MyDataAdapter.Fill(MyDataSet)
Return MyDataSet
Catch ex As Exception
DefaultErrorMsg = ex.ToString
End Try
mySQLConnection.Close()
MyDataSet = Nothing
MyDataAdapter = Nothing
MySQLCommand = Nothing
mySQLConnection = Nothing
End Function
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rodeo
9/1/2003 1:36:15 PM
U can do this by SQL too.
implement a SQL query like this:
sql="Select *, (Select Count(*) from table B where B.id<A.id) as RowNumber from table A where Total between (" + MinValue + " and " + MaxValue + ")"
simply it does a numeration of each row and then you ask just the rows between MinValue and MaxValue
Does it helps?
Alexandre MP Gomes
A programmer never dies, only gosub without return!
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Alexmipego
9/1/2003 4:37:39 PM
I forgotten... I think SQLServer2k have a function that returns u the number of that row... its quicker and save lots of processor...
Alexandre MP Gomes
A programmer never dies, only gosub without return!
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Alexmipego
9/1/2003 4:39:24 PM
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McMurdoStation
9/1/2003 9:56:59 PM
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