How to Optimize PDO Database Connections in PHP Using the Factory Pattern?

Best practices for optimizing PDO database connections in PHP: Factory pattern

This article will explore how to use PHP and PDO to establish database connections efficiently and solve common problems.

Shortcomings of existing methods

The sample code shows a database connection and configuration method containing connect_pdo classes and sessions.php files. While this approach can establish a connection and access SQL queries from any part of the code base, there is still room for improvement.

Recommended method: factory mode

In order to optimize connection settings and ensure correct configuration, it is recommended to use anonymous functions and factory patterns. This approach has the following advantages:

• Centralized management: Centrally manage connections to ensure only one connection is created for each database.
• Lazy loading: Only create connections when needed, improving performance.
• Easy to test: Simplify unit testing and improve code maintainability.

Achievement

Implementation methods include creating provider functions and factory classes. Provider function sets up PDO connection:

$provider = function() {
    $instance = new PDO('mysql:...', 'username', 'password');
    $instance->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $instance->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
    return $instance;
};

The factory class uses the provider function to create the connection object:

class StructureFactory {
    protected $provider;
    protected $connection;

    public function __construct(callable $provider) {
        $this->provider = $provider;
    }

    public function create($name) {
        if ($this->connection === null) {
            $this->connection = call_user_func($this->provider);
        }
        return new $name($this->connection);
    }
}

Usage:

In other parts of the code base, you can use factories to create connection objects:

$factory = new StructureFactory($provider);
$something = $factory->create('Something');
$foobar = $factory->create('Foobar');

Summary

By adopting this improved approach, you can establish reliable and optimized PDO connections, centrally manage connections, and improve code testability and maintainability.

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