public function query( $query ) {
    if ( ! $this->ready ) {
      $this->check_current_query = true;
      return false;
    }

    
/**
 * Filters the database query.
 *
 * Some queries are made before the plugins have been loaded,
 * and thus cannot be filtered with this method.
 *
 * @since 2.1.0
 *
 * @param string $query Database query.
 */
    $query = apply_filters( 'query', $query );

    $this->wpdb::flush();

    // Log how the function was called.
    $this->func_call = "\$db->query(\"$query\")";

    // If we're writing to the database, make sure the query will write safely.
    if ( $this->check_current_query && ! $this->wpdb::check_ascii( $query ) ) {
      $stripped_query = $this->wpdb::strip_invalid_text_from_query( $query );
      // strip_invalid_text_from_query() can perform queries, so we need
      // to flush again, just to make sure everything is clear.
      $this->wpdb::flush();
      if ( $stripped_query !== $query ) {
        $this->insert_id = 0;
        return false;
      }
    }

    $this->check_current_query = true;

    // Keep track of the last query for debug.
    $this->last_query = $query;

    $this->wpdb::_do_query( $query );

    // MySQL server has gone away, try to reconnect.
    $mysql_errno = 0;
    if ( ! empty( $this->dbh ) ) {
      if ( $this->use_mysqli ) {
        if ( $this->dbh instanceof mysqli ) {
          $mysql_errno = mysqli_errno( $this->dbh );
        } else {
          // $dbh is defined, but isn't a real connection.
          // Something has gone horribly wrong, let's try a reconnect.
          $mysql_errno = 2006;
        }
      } else {
        if ( is_resource( $this->dbh ) ) {
          $mysql_errno = mysql_errno( $this->dbh );
        } else {
          $mysql_errno = 2006;
        }
      }
    }

    if ( empty( $this->dbh ) || 2006 == $mysql_errno ) {
      if ( $this->wpdb::check_connection() ) {
        $this->wpdb::_do_query( $query );
      } else {
        $this->insert_id = 0;
        return false;
      }
    }

    // If there is an error then take note of it.
    if ( $this->use_mysqli ) {
      if ( $this->dbh instanceof mysqli ) {
        $this->last_error = mysqli_error( $this->dbh );
      } else {
        $this->last_error = __( 'Unable to retrieve the error message from MySQL' );
      }
    } else {
      if ( is_resource( $this->dbh ) ) {
        $this->last_error = mysql_error( $this->dbh );
      } else {
        $this->last_error = __( 'Unable to retrieve the error message from MySQL' );
      }
    }

    if ( $this->last_error ) {
      // Clear insert_id on a subsequent failed insert.
      if ( $this->insert_id && preg_match( '/^\s*(insert|replace)\s/i', $query ) ) {
        $this->insert_id = 0;
      }

      $this->wpdb::print_error();
      return false;
    }

    if ( preg_match( '/^\s*(create|alter|truncate|drop)\s/i', $query ) ) {
      $return_val = $this->result;
    } elseif ( preg_match( '/^\s*(insert|delete|update|replace)\s/i', $query ) ) {