Как в родительском классе указать не сколько таблиц для методов? Пишу не большой Product List с функциями CRUD. Реализовал это всё в процедурном стиле, сейчас переделываю на ООП вариант. Есть родительский класс в нем указаны методы CRUD, и общие параметры дочерних классов! Каждый дочерний класс работает со своей таблицей, + у них есть свои дополнительные параметры характерны только им. Как реализовать все CRUD методы в родительском классе.
Родительский класс Product.php class Product implements ProductInterface {
private $conn;
protected $table_name;
public $id;
public $sku;
public $img;
public $name;
public $description;
public $price;
public function __construct($db){
$this->conn = $db;
$this->table_name = "Books";
}

public function readAll(){
$query = "SELECT * FROM " . $this->table_name . " ORDER BY id DESC";
$stmt = $this->conn->prepare( $query );
$stmt->execute();
return $stmt;
}
function readOne(){
$query = "SELECT sku, name, img, author, price, weight, description FROM " . $this->table_name . "
WHERE id = ? LIMIT 0,1";
$stmt = $this->conn->prepare( $query );
$stmt->bindParam(1, $this->id);
$stmt->execute();
$row = $stmt->fetch(PDO::FETCH_ASSOC);
//data that will be executed in `book_id`
$this->sku = $row['sku'];
$this->name = $row['name'];
$this->img = $row['img'];
$this->author = $row['author'];
$this->description = $row['description'];
$this->weight = $row['weight'];
$this->price = $row['price'];
}
function create(){
//query for creating new book in table
$query = "INSERT INTO " . $this->table_name . " (sku, name, author, description, price, weight)" .
"VALUES ('{$this->sku}','{$this->name}','{$this->author}','{$this->description}','{$this->price}','{$this->weight}');";
$stmt = $this->conn->prepare($query);
// posted values
$this->sku=htmlspecialchars(strip_tags($this->sku));
$this->name=htmlspecialchars(strip_tags($this->name));
$this->author=htmlspecialchars(strip_tags($this->author));
$this->description=htmlspecialchars(strip_tags($this->description));
$this->price=htmlspecialchars(strip_tags($this->price));
$this->weight=htmlspecialchars(strip_tags($this->weight));
// bind values
$stmt->bindParam(":sku", $this->sku);
$stmt->bindParam(":name", $this->name);
$stmt->bindParam(":author", $this->author);
$stmt->bindParam(":description", $this->description);
$stmt->bindParam(":price", $this->price);
$stmt->bindParam(":weight", $this->weight);
if($stmt->execute()){
return true;
}else{
return false;
}
}
function delete(){
$query = "DELETE FROM " . $this->table_name . " WHERE id = ?";
$stmt = $this->conn->prepare($query);
$stmt->bindParam(1, $this->id);
if($result = $stmt->execute()){
return true;
}else{
return false;
}
}
}
В родительском методе сейчас методы характерны для класса books.php в этом классе остались только параметрыrequire_once 'Product.php';
class books extends Product {
public $author;
public $weight;
Но есть ещё два класса с продуктами dvd и furniture, с такими же методами CRUD только дополнительно со своими параметрами.class dvd extends Product {
// database connection and table name
private $conn;
protected $table_name = "dvd";
// object properties
public $capacity;
public function __construct($db){
$this->conn = $db;
}
//query to read all notes from `dvd` table
function readAll(){
$query = "SELECT * FROM " . $this->table_name . " ORDER BY id DESC";
$stmt = $this->conn->prepare( $query );
$stmt->execute();
return $stmt;
}
//query to read one dvd and all data of it by `id` from `dvd` table
function readOne(){
$query = "SELECT sku, name, img, price, description, capacity FROM " . $this->table_name . "
WHERE id = ? LIMIT 0,1";
$stmt = $this->conn->prepare( $query );
$stmt->bindParam(1, $this->id);
$stmt->execute();
$row = $stmt->fetch(PDO::FETCH_ASSOC);
//data that will be executed in `dvd_id`
$this->sku = $row['sku'];
$this->name = $row['name'];
$this->img = $row['img'];
$this->description = $row['description'];
$this->price = $row['price'];
$this->capacity = $row['capacity'];
}
// query to create new dvd
function create(){
//query for creating new book in table
$query = "INSERT INTO `dvd` (scu, name, description, price, capacity)" .
"VALUES ('{$this->sku}','{$this->name}','{$this->description}','{$this->price}','{$this->capacity}');";
$stmt = $this->conn->prepare($query);
// posted values
$this->sku=htmlspecialchars(strip_tags($this->sku));
$this->name=htmlspecialchars(strip_tags($this->name));
$this->description=htmlspecialchars(strip_tags($this->description));
$this->price=htmlspecialchars(strip_tags($this->price));
$this->capacity=htmlspecialchars(strip_tags($this->capacity));
// bind values
$stmt->bindParam(":sku", $this->sku);
$stmt->bindParam(":name", $this->name);
$stmt->bindParam(":description", $this->description);
$stmt->bindParam(":price", $this->price);
$stmt->bindParam(":capacity", $this->capacity);
if($stmt->execute()){
return true;
}else{
return false;
}
}
// query for updating dvd and change dvd data in simple form
function update(){
$query = "UPDATE
" . $this->table_name . "
SET
sku = :sku,
name = :name,
description = :description,
price = :price,
capacity = :capacity
WHERE
id = :id";
$stmt = $this->conn->prepare($query);
// posted values that user can change
$this->sku=htmlspecialchars(strip_tags($this->sku));
$this->name=htmlspecialchars(strip_tags($this->name));
$this->description=htmlspecialchars(strip_tags($this->description));
$this->price=htmlspecialchars(strip_tags($this->price));
$this->capacity=htmlspecialchars(strip_tags($this->capacity));
$this->id=htmlspecialchars(strip_tags($this->id));
// bind parameters
$stmt->bindParam(':sku', $this->sku);
$stmt->bindParam(':name', $this->name);
$stmt->bindParam(':description', $this->description);
$stmt->bindParam(':price', $this->price);
$stmt->bindParam(':capacity', $this->capacity);
$stmt->bindParam(':id', $this->id);
// execute the query
if($stmt->execute()){
return true;
}
return false;
}
//query to delete the product by id
function delete(){
$query = "DELETE FROM " . $this->table_name . " WHERE id = ?";
$stmt = $this->conn->prepare($query);
$stmt->bindParam(1, $this->id);
if($result = $stmt->execute()){
return true;
}else{
return false;
}
}
}
Как объединить и реализовать эти общие методы в этих классах?

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