PHP and PDO

Hello, budding PHP developers!

Delve deeper into the world of PHP with the PHP Data Objects (PDO). PDO offers a unified interface for accessing databases in PHP, ensuring flexibility and security. So, let’s explore PDO!

Why PDO?

• Database Agnostic: PDO is versatile and can work with a variety of database systems without requiring changes to your code.
• Prepared Statements: With PDO, you can use prepared statements, bolstering your application’s defense against SQL injection attacks.

Key Points

Connecting to a Database: With PDO, connecting to a database becomes simple:
$dsn = 'mysql:host=localhost;dbname=testdb';
$username = 'username';
$password = 'password';
try {
$conn = new PDO($dsn, $username, $password);
echo "Connected successfully!";
} catch (PDOException $e) {
echo "Connection failed: " . $e->getMessage();
}

CRUD Operations using PDO

• Create:  Insert new records into the database.

$stmt = $conn->prepare("INSERT INTO users (name, email) VALUES (:name, :email)");
$stmt->bindParam(':name', $name);
$stmt->bindParam(':email', $email);
$stmt->execute();

• Read: Retrieve specific records or fetch all records from the database.

$stmt = $conn->prepare("SELECT name, email FROM users");
$stmt->execute();
$result = $stmt->fetchAll();
foreach ($result as $row) {
echo $row['name'] . " - " . $row['email'] . "";
}

• Update: Modify or change existing records in the database based on certain conditions.

$stmt = $conn->prepare("UPDATE users SET email=:email WHERE name=:name");
$stmt->bindParam(':name', $name);
$stmt->bindParam(':email', $updatedEmail);
$stmt->execute();

• Delete: Remove specific records from the database.

$stmt = $conn->prepare("DELETE FROM users WHERE name=:name");
$stmt->bindParam(':name', $name);
$stmt->execute();

Exercise

Now let’s Jdoodle it!

• Create a connection using PDO.
• Add a few entries using prepared statements.
• Display these entries.
• Update and delete some records.

Conclusion

Mastering PDO will enhance your proficiency in handling database operations in PHP. With PDO, you’re not just coding; you’re crafting secure and efficient database interactions. Practice and explore the myriad functionalities PDO offers, and soon you’ll be a PDO maestro!