ADO Event Instantiation: Visual J++

This short Microsoft® Visual J++® example shows how you can associate your own function with a particular event.

// BeginEventExampleVJ
import wfc.data.*;
public class MyClass
{
ConnectionEventHandler handler = 
    new ConnectionEventHandler(this,"onConnectComplete");

    public void onConnectComplete(Object sender,ConnectionEvent e)
    {
        if (e.adStatus == AdoEnums.EventStatus.ERRORSOCCURRED) 
            System.out.println("Connection failed");
        else
            System.out.println("Connection completed");
        return;
    }
    
    void main( void )
    {
        Connection conn = new Connection();
    
        conn.addOnConnectComplete(handler);     // Enable event support.
        conn.open("DSN=Pubs");
        conn.close();
        conn.removeOnConnectComplete(handler);  // Disable event support.
    }
}
// EndEventExampleVJ

First, the class method onConnectionComplete is associated with the ConnectionComplete event by creating a new ConnectionEventHandler object and assigning the onConnectComplete function to the object.

The main function then creates a Connection object and enables event handling by calling the addOnConnectComplete method and passing it the address of the handler function.