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.
Open a command prompt.
Change to the directory where the OLE DB provider is installed.
Enter the following command to register the provider:
For more information about connecting to a database using OLE DB, see Connecting to a database using OLE DB.