code: public void setDataSource(DataSource dataSource) {
          mDataSource = dataSource;
          mDriverClassName = null;
          mURL = null;
          mUsername = null;
          mPassword = null;
      }
docs: Set the source of JDBC connections, overriding any configuration
  supported by these methods:
  
  <ul>
  <li>{@link #setDriverClassName}
  <li>{@link #setDriverURL}
  <li>{@link #setUserName}
  <li>{@link #setPassword}
  </ul>