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<?php  // THE DATABASE CLASS
class Database {
    private static $dsn = 'mysql:host=localhost;dbname=my_dbname';
    private static $username = 'mgs_user';
    private static $password = 'pa55word';
    private static $db;

    private function __construct() {}

    public static function getDB () {
        if (!isset(self::$db)) {
            try {
                self::$db = new PDO(self::$dsn, self::$username, self::$password);
            } catch (PDOException $e) {
                $error_message = $e->getMessage();
                include('../errors/database_error.php');
                exit();
            }
        }
        return self::$db;
    }
}
?>



<?php  // THE CATEGORY DATABASE CLASS, get categories and get category
class CategoryDB {
    public static function getCategories() {
        $db = Database::getDB();
        $query = 'SELECT * FROM categories
                  ORDER BY categoryID';
        $statement = $db->prepare($query);
        $statement->execute();
        
        $categories = array();
        foreach ($statement as $row) {
            $category = new Category($row['categoryID'], $row['categoryName']);
            $categories[] = $category;
        }
        return $categories;
    }

    public static function getCategory($category_id) {
        $db = Database::getDB();
        $query = 'SELECT * FROM categories
                  WHERE categoryID = :category_id';    
        $statement = $db->prepare($query);
        $statement->bindValue(':category_id', $category_id);
        $statement->execute();    
        $row = $statement->fetch();
        $statement->closeCursor();    
        $category = new Category($row['categoryID'], $row['categoryName']);
        return $category;
    }
}
?>


<?php  // THE CATEGORY CLASS
class Category {
    private $id;
    private $name;

    public function __construct($id, $name) {
        $this->id = $id;
        $this->name = $name;
    }

    public function getID() {
        return $this->id;
    }

    public function setID($value) {
        $this->id = $value;
    }

    public function getName() {
        return $this->name;
    }

    public function setName($value) {
        $this->name = $value;
    }
}
?>