public function execute( $query, array $data = [ ] )
    {
        $result = NULL;

        $statement = $this->database->prepare( $query );

        if ( FALSE === $statement )
        {
            $this->close();

            throw new DatabaseException( 'Failed to create prepared statement.' );
        }

        $result = $statement->execute( $data );

        $this->query = $statement->queryString;

        if ( FALSE !== $result )
        {
            $result = ( int ) $statement->rowCount();
        }

        return $result;
    }