how to deploy PHP to Google App Engine and Google Cloud SQL using Quercus?

I tried to deploy my php application on Google App Engine and Google Cloud SQL using Quercus. But, I got an error message: not suitable Driver.

My code is

import com.google.appengine.api.rdbms.AppEngineDriver;

import java.io.IOException;
import java.sql.*;

java("java.sql.DriverManager")->registerDriver(new Java("com.google.appengine.api.rdbms.AppEngineDriver"));

$c = java("java.sql.DriverManager")->getConnection("jdbc:google:rdbms://soccipasspc:pass-pc/passpc");

..................

Any help are appreicated!