How to Utilize PDO in Your Classes with the Singleton Pattern for Efficient Database Operations?

Incorporating PDO into Classes for Database Operations

In your codebase, you have multiple classes responsible for performing MySQL queries and implementing prepared statements. To effectively utilize PDO within these classes, you can leverage a single, centralized connection to the database using the singleton pattern.

The singleton design pattern ensures that there is only one instance of a class, which is shared throughout the application. In this case, you can create a class, such as "Core," to implement the singleton pattern and handle database connectivity. Here's an example:

<code class="php">class Core {
    private static $instance;
    public $dbh;

    private function __construct() {
        // Configuration and database connection initialization
    }

    public static function getInstance() {
        if (!isset(self::$instance)) {
            self::$instance = new self;
        }
        return self::$instance;
    }
}</code>

Instead of creating a new PDO object within each class, you can access the central connection maintained by the "Core" class. The following code demonstrates how to incorporate this pattern into your existing classes:

<code class="php">class Foo extends PDO {
    public $dbh;

    public function __construct() {
        $core = Core::getInstance();
        $this->dbh = $core->dbh;
    }

    public function bar() {
        $this->dbh->prepare('SELECT * FROM table');
        $this->dbh->execute();
    }
}</code>

With this approach, you ensure a centralized and shared database connection across your classes, avoiding unnecessary connection establishment and resource duplication.

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