What are some potential pitfalls when using multiple classes in PHP for database queries?

One potential pitfall when using multiple classes in PHP for database queries is the lack of proper error handling and exception catching. To solve this, it is important to implement try-catch blocks in your code to handle any potential errors that may arise during database operations. 

try {
    // Database connection setup
    $db = new PDO("mysql:host=localhost;dbname=mydatabase", "username", "password");
    $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

    // Query execution
    $stmt = $db->prepare("SELECT * FROM users");
    $stmt->execute();
    $result = $stmt->fetchAll(PDO::FETCH_ASSOC);

    // Displaying results
    foreach ($result as $row) {
        echo $row['username'] . "<br>";
    }

} catch (PDOException $e) {
    echo "Error: " . $e->getMessage();
}

Keywords

SQL injection object-oriented programming PDO prepared statements database abstraction layer

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