127 lines
4.7 KiB
PHP
127 lines
4.7 KiB
PHP
<?php
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/**
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* Class Database
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* Manages database connections for SQLite and MySQL (or MariaDB).
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*/
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class Database {
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/**
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* @var PDO|null $pdo The PDO instance representing the database connection.
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*/
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private $pdo;
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/**
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* Database constructor.
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* Initializes the database connection based on provided options.
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*
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* @param array $options An associative array with database connection options:
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* - type: The database type ('sqlite', 'mysql', or 'mariadb').
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* - dbFile: The path to the SQLite database file (required for SQLite).
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* - host: The database host (required for MySQL).
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* - port: The port for MySQL (optional, default: 3306).
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* - dbname: The name of the MySQL database (required for MySQL).
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* - user: The username for MySQL (required for MySQL).
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* - password: The password for MySQL (optional).
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*
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* @throws Exception If required extensions are not loaded or options are invalid.
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*/
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public function __construct($options) {
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// check if PDO extension is loaded
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if ( !extension_loaded('pdo') ) {
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$error = getError('PDO extension not loaded.');
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}
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// options check
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if (empty($options['type'])) {
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$error = getError('Database type is not set.');
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}
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// connect based on database type
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switch ($options['type']) {
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case 'sqlite':
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$this->connectSqlite($options);
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break;
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case 'mysql' || 'mariadb':
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$this->connectMysql($options);
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break;
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default:
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$error = getError("Database type \"{$options['type']}\" is not supported.");
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}
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}
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/**
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* Establishes a connection to a SQLite database.
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*
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* @param array $options An associative array with SQLite connection options:
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* - dbFile: The path to the SQLite database file.
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*
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* @throws Exception If the SQLite PDO extension is not loaded or the database file is missing.
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*/
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private function connectSqlite($options) {
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// pdo_sqlite extension is needed
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if (!extension_loaded('pdo_sqlite')) {
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$error = getError('PDO extension for SQLite not loaded.');
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}
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// SQLite options
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if (empty($options['dbFile']) || !file_exists($options['dbFile'])) {
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$error = getError("SQLite database file \"{$options['dbFile']}\" not found.");
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}
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// connect to SQLite
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try {
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$this->pdo = new PDO("sqlite:" . $options['dbFile']);
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$this->pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
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// enable foreign key constraints (not ON by default in SQLite3)
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$this->pdo->exec('PRAGMA foreign_keys = ON;');
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} catch (PDOException $e) {
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$error = getError('SQLite connection failed: ', $e->getMessage());
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}
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}
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/**
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* Establishes a connection to a MySQL (or MariaDB) database.
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*
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* @param array $options An associative array with MySQL connection options:
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* - host: The database host.
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* - port: The database port (default: 3306).
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* - dbname: The name of the database.
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* - user: The database username.
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* - password: The database password (optional).
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*
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* @throws Exception If the MySQL PDO extension is not loaded or required options are missing.
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*/
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private function connectMysql($options) {
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// pdo_mysql extension is needed
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if (!extension_loaded('pdo_mysql')) {
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$error = getError('PDO extension for MySQL not loaded.');
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}
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// MySQL options
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if (empty($options['host']) || empty($options['dbname']) || empty($options['user'])) {
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$error = getError('MySQL connection data is missing.');
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}
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// Connect to MySQL
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try {
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$dsn = "mysql:host={$options['host']};port={$options['port']};dbname={$options['dbname']};charset=utf8";
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$this->pdo = new PDO($dsn, $options['user'], $options['password'] ?? '');
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$this->pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
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} catch (PDOException $e) {
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$error = getError('MySQL connection failed: ', $e->getMessage());
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}
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}
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/**
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* Retrieves the current PDO connection instance.
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*
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* @return PDO|null The PDO instance or null if no connection is established.
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*/
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public function getConnection() {
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return $this->pdo;
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}
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}
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?>
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