Can I use a MySQL database with an App Engine application

Question

I know that App Engine has its own datastore. This is great for most cases and fairly easy to used. However, we have a MySQL database that we use for several applications an

Answer 1

Using a Local MySQL Instance During Development:

 


 import com.google.appengine.api.rdbms.AppEngineDriver;
    public static void makeConnection() {
        try {
            if (conn == null || !conn.isValid(0)) {
                String url = "localhost/databasename";
                String username = "root";
                String password = "password";
                DriverManager.registerDriver(new AppEngineDriver());
                String urlForConnection = "jdbc:mysql://" + url;
                conn = DriverManager.getConnection(urlForConnection, username, password);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

// in web.xml
    
        _ah_DevSocketFilter
        com.google.appengine.api.socket.dev.DevSocketFilter
        
            use-native-sockets
            true
        
    

    
        _ah_DevSocketFilter
        /*
    

Using cloud

 

    DriverManager.registerDriver(new AppEngineDriver());
              c = DriverManager.getConnection("jdbc:google:rdbms://instance_name/guestbook");