System Design Fundamentals: Building Scalable Applications
Learn system design principles for scalable applications. Cover load balancing, caching, database sharding, microservice...
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function connectDatabase() {
$host = 'localhost';
$dbname = 'savemycode';
$username = 'root';
$password = '';
try {
$pdo = new PDO(
"mysql:host=$host;dbname=$dbname",
$username,
$password
);
return $pdo;
} catch(PDOException $e) {
die("Connection failed");
}
}
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Learn system design principles for scalable applications. Cover load balancing, caching, database sharding, microservice...
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<?php
class Database {
private static $instance = null;
private $connection;
private $host = 'localhost';
private $dbname = 'yo...
SELECT u.name,o.amount
FROM users u
JOIN orders o ON u.id=o.user_id;
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