52 lines
2.0 KiB
PHP
52 lines
2.0 KiB
PHP
<?php
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// db/config.php
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// --- Database Credentials ---
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// Note: In a real production environment, use environment variables
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// or a secure secrets management system instead of hardcoding credentials.
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define('DB_HOST', '127.0.0.1');
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define('DB_NAME', 'webapp_db');
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define('DB_USER', 'webapp_user');
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define('DB_PASS', 'password'); // IMPORTANT: Use a strong, unique password in production
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/**
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* Establishes a PDO database connection.
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*
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* @return PDO|null A PDO connection object on success, or null on failure.
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*/
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function db_connect() {
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static $pdo = null;
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if ($pdo instanceof PDO) {
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return $pdo;
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}
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$dsn = 'mysql:host=' . DB_HOST . ';dbname=' . DB_NAME . ';charset=utf8mb4';
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$options = [
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PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
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PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
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PDO::ATTR_EMULATE_PREPARES => false,
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];
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try {
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// Create a new database and user if they don't exist.
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// This is for demonstration purposes to make setup easier.
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// In a production environment, database and user management should be handled separately.
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$rootPdo = new PDO('mysql:host=' . DB_HOST, 'root', '');
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$rootPdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
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$rootPdo->exec('CREATE DATABASE IF NOT EXISTS ' . DB_NAME);
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$rootPdo->exec("CREATE USER IF NOT EXISTS '" . DB_USER . "'@'localhost' IDENTIFIED BY '" . DB_PASS . "'");
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$rootPdo->exec('GRANT ALL PRIVILEGES ON ' . DB_NAME . '.* TO '' . DB_USER . ''@'localhost'');
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$rootPdo = null;
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$pdo = new PDO($dsn, DB_USER, DB_PASS, $options);
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return $pdo;
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} catch (PDOException $e) {
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// In a real app, you would log this error and show a generic error page.
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// For development, it's useful to see the error.
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error_log('Database Connection Error: ' . $e->getMessage());
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// Never echo connection errors in production
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// echo 'Connection failed: ' . $e->getMessage();
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return null;
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}
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} |