Click here to view and discuss this page in DocCommentXchange. In the future, you will be sent there automatically.

Connecting to a database with the Connection object

This section describes a simple Visual Basic routine that connects to a database.

You can try this routine by placing a command button named Command1 on a form, and pasting the routine into its Click event. Run the program and click the button to connect and then disconnect.

Private Sub cmdTestConnection_Click()
    ' Declare variables
    Dim myConn As New ADODB.Connection
    Dim myCommand As New ADODB.Command
    Dim cAffected As Long

    On Error GoTo HandleError

    ' Establish the connection
    myConn.Provider = "SAOLEDB"
    myConn.ConnectionString = _
      "Data Source=SQL Anywhere 10 Demo"
    myConn.Open
    MsgBox "Connection succeeded"
    myConn.Close
    Exit Sub

HandleError:
    MsgBox "Connection failed"
    Exit Sub
End Sub

The sample carries out the following tasks:

• It declares the variables used in the routine.

• It establishes a connection, using the SQL Anywhere OLE DB provider, to the sample database.

• It uses a Command object to execute a simple statement, which displays a message in the Server Messages window.

• It closes the connection.

When the SAOLEDB provider is installed, it registers itself. This registration process includes making registry entries in the COM section of the registry, so that ADO can locate the DLL when the SAOLEDB provider is called. If you change the location of your DLL, you must reregister it.

To register the OLE DB provider

1. Open a command prompt.

2. Change to the directory where the OLE DB provider is installed.

3. Enter the following command to register the provider:

   regsvr32 dboledb10.dll

For more information about connecting to a database using OLE DB, see Connecting to a database using OLE DB.