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Всем привет. Есть модель (если можно так назвать), состоящая из статичных методов. В каждом методе есть подключение к БД. Как это можно преобразовать, поскольку делать запрос каждый раз – не есть хорошо?

/**  * Класс Category - модель для работы с категориями товаров  */ class Category {      public static function getCategoriesByName($  names) {     // Соединение с БД     $  db = Db::getConnection();      // Текст запроса к БД     $  sql = 'SELECT * FROM categories WHERE link IN (?,?)';      // Используется подготовленный запрос     $  result = $  db->prepare($  sql);     $  result->bindParam(':link', $  link, PDO::PARAM_INT);      // Указываем, что хотим получить данные в виде массива     $  result->setFetchMode(PDO::FETCH_ASSOC);      // Выполняем запрос     $  result->execute($  names);      // Возвращаем данные     return $  result->fetchAll(); } public static function getChildrenCategoriesByParent($  id) {     // Соединение с БД     $  db = Db::getConnection();      // Текст запроса к БД     $  sql = 'SELECT cat.id, cat.title, cat.link FROM categories AS cat                             WHERE cat.parent_id = :id';       // Используется подготовленный запрос     $  result = $  db->prepare($  sql);     $  result->bindParam(':id', $  id, PDO::PARAM_INT);      // Указываем, что хотим получить данные в виде массива     $  result->setFetchMode(PDO::FETCH_ASSOC);      // Выполняем запрос     $  result->execute();      // Возвращаем данные     return $  result->fetchAll(); } /**  * Возвращает текстое пояснение статуса для категории :<br/>  * <i>0 - Скрыта, 1 - Отображается</i>  * @param integer $  status <p>Статус</p>  * @return string <p>Текстовое пояснение</p>  */ public static function getStatusText($  status) {     switch ($  status) {         case '1':             return 'Отображается';             break;         case '0':             return 'Скрыта';             break;     } }  /**  * Добавляет новую категорию  * @param string $  name <p>Название</p>  * @param integer $  sortOrder <p>Порядковый номер</p>  * @param integer $  status <p>Статус <i>(включено "1", выключено "0")</i></p>  * @return boolean <p>Результат добавления записи в таблицу</p>  */ public static function createCategory($  name, $  sortOrder, $  status) {     // Соединение с БД     $  db = Db::getConnection();      // Текст запроса к БД     $  sql = 'INSERT INTO category (name, sort_order, status) '             . 'VALUES (:name, :sort_order, :status)';      // Получение и возврат результатов. Используется подготовленный запрос     $  result = $  db->prepare($  sql);     $  result->bindParam(':name', $  name, PDO::PARAM_STR);     $  result->bindParam(':sort_order', $  sortOrder, PDO::PARAM_INT);     $  result->bindParam(':status', $  status, PDO::PARAM_INT);     return $  result->execute(); }  } 

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