When should a developer consider using MySQL or SQLite for a guestbook instead of a file-based database?

Developers should consider using MySQL or SQLite for a guestbook instead of a file-based database when they need to handle multiple concurrent users, require more advanced querying capabilities, or plan to scale the application in the future. MySQL and SQLite offer better performance, scalability, and reliability compared to file-based databases. 

// Example PHP code snippet using MySQL for a guestbook

// Connect to MySQL database
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "guestbook";

$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// Insert new entry into guestbook
$name = "John Doe";
$message = "Hello, world!";
$sql = "INSERT INTO entries (name, message) VALUES ('$name', '$message')";

if ($conn->query($sql) === TRUE) {
    echo "New record created successfully";
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}

// Close connection
$conn->close();

Keywords

MySQL SQLite file-based database PHP guestbook

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