Filter and RecordCount Properties Example (VB)

This example open a Recordset on the Publishers table in the Pubs database. It then uses the Filter property to limit the number of visible records to those publishers in a particular country/region. The RecordCount property is used to show the difference between the filtered and unfiltered recordsets.

'BeginFilterVB  
  
    'To integrate this code  
    'replace the data source and initial catalog values  
    'in the connection string  
  
Public Sub Main()  
    On Error GoTo ErrorHandler  
  
    ' recordset variables  
    Dim rstPublishers As ADODB.Recordset  
    Dim Cnxn As ADODB.Connection  
    Dim strCnxn As String  
    Dim SQLPublishers As String  
  
     ' criteria variables  
    Dim intPublisherCount As Integer  
    Dim strCountry As String  
    Dim strMessage As String  
  
     ' open connection  
    Set Cnxn = New ADODB.Connection  
    strCnxn = "Provider='sqloledb';Data Source='MySqlServer';" & _  
        "Initial Catalog='Pubs';Integrated Security='SSPI';"  
    Cnxn.Open strCnxn  
  
    ' open recordset with data from Publishers table  
    Set rstPublishers = New ADODB.Recordset  
    SQLPublishers = "publishers"  
    rstPublishers.Open SQLPublishers, strCnxn, adOpenStatic, , adCmdTable  
  
    intPublisherCount = rstPublishers.RecordCount  
  
    ' get user input  
    strCountry = Trim(InputBox("Enter a country to filter on (e.g. USA):"))  
  
    If strCountry <> "" Then  
        ' open a filtered Recordset object  
        rstPublishers.Filter = "Country ='" & strCountry & "'"  
  
        If rstPublishers.RecordCount = 0 Then  
            MsgBox "No publishers from that country."  
        Else  
           ' print number of records for the original recordset  
           ' and the filtered recordset  
            strMessage = "Orders in original recordset: " & _  
                vbCr & intPublisherCount & vbCr & _  
                "Orders in filtered recordset (Country = '" & _  
                strCountry & "'): " & vbCr & _  
                rstPublishers.RecordCount  
            MsgBox strMessage  
        End If  
    End If  
  
    ' clean up  
    rstPublishers.Close  
    Cnxn.Close  
    Set rstPublishers = Nothing  
    Set Cnxn = Nothing  
    Exit Sub  
  
ErrorHandler:  
    ' clean up  
    If Not rstPublishers Is Nothing Then  
        If rstPublishers.State = adStateOpen Then rstPublishers.Close  
    End If  
    Set rstPublishers = Nothing  
  
    If Not Cnxn Is Nothing Then  
        If Cnxn.State = adStateOpen Then Cnxn.Close  
    End If  
    Set Cnxn = Nothing  
  
    If Err <> 0 Then  
        MsgBox Err.Source & "-->" & Err.Description, , "Error"  
    End If  
  
End Sub  
'EndFilterVB  

Note

When you know the data you want to select, it's usually more efficient to open a Recordset with an SQL statement. This example shows how you can create just one Recordset and obtain records from a particular country.

Attribute VB_Name = "Filter"  

See Also

Filter Property
RecordCount Property (ADO)
Recordset Object (ADO)