public JdbcDatabaseTester( String driverClass, String connectionUrl, String username, String password )
public JdbcDatabaseTester( String driverClass, String connectionUrl )
   public JdbcDatabaseTester( String driverClass, String connectionUrl, String username,         String password )   {      super();      this.driverClass = driverClass;      this.connectionUrl = connectionUrl;      this.username = username;      this.password = password;   }