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 ) ) {
            $this->rows_affected = mysqli_affected_rows( $this->dbh );
 
            // Take note of the insert_id.
            if ( preg_match( '/^\s*(insert|replace)\s/i', $query ) ) {
                $this->insert_id = mysqli_insert_id( $this->dbh );
            }
 
            // Return number of rows affected.
            $return_val = $this->rows_affected;
        } else {
            $num_rows = 0;
 
            if ( $this->result instanceof mysqli_result ) {
                while ( $row = mysqli_fetch_object( $this->result ) ) {
                    $this->last_result[ $num_rows ] = $row;
                    ++$num_rows;
                }
            }
 
            // Log and return the number of rows selected.
            $this->num_rows = $num_rows;
            $return_val     = $num_rows;
        }
 
        return $return_val;
    }
 
    /**
     * Internal function to perform the mysqli_query() call.
     *
     * @since 3.9.0
     *
     * @see wpdb::query()
     *