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<?php |
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namespace Pyjac\ORM; |
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use PDO; |
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class DatabaseConnection implements DatabaseConnectionInterface |
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{ |
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/** |
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* The instance of this class. |
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* |
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* @var Pyjac\ORM\DatabaseConnection. |
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*/ |
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private static $instance; |
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/** |
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* The PDO database connection in use. |
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* |
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* @var \PDO |
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*/ |
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public $databaseConnection; |
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/** |
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* The configuration values. |
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* |
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* @var array |
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*/ |
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private $config; |
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/** |
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* The default PDO connection options. |
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* |
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* @var array |
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*/ |
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protected $options = [ |
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PDO::ATTR_CASE => PDO::CASE_NATURAL, |
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PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION, |
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PDO::ATTR_ORACLE_NULLS => PDO::NULL_NATURAL, |
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PDO::ATTR_STRINGIFY_FETCHES => false, |
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PDO::ATTR_EMULATE_PREPARES => false, |
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]; |
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/** |
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* Create a new Database Connection. |
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* |
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* @param DatabaseConnectionStringFactoryInterface $dbConnStringFactory |
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*/ |
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public function __construct(DatabaseConnectionStringFactoryInterface $dbConnStringFactory) |
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{ |
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$this->loadEnv(); // load the environment variables |
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$neededValues = ['DRIVER', 'HOSTNAME', 'USERNAME', 'PASSWORD', 'DBNAME', 'PORT']; |
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//Extract needed environment variables from the $_ENV global array |
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$this->config = array_intersect_key($_SERVER, array_flip($neededValues)); |
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$dsn = $dbConnStringFactory->createDatabaseSourceString($this->config); |
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$this->databaseConnection = $this->createConnection($dsn); |
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} |
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/** |
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* Get the instance of the class. |
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* |
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* @return Pyjac\ORM\DatabaseConnection |
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*/ |
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public static function getInstance() |
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{ |
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if (self::$instance === null) { |
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self::$instance = new self(new DatabaseConnectionStringFactory()); |
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} |
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return self::$instance; |
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} |
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/** |
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* Create a new PDO connection. |
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* |
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* @param string $dsn |
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* |
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* @return \PDO |
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*/ |
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public function createConnection($dsn) |
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{ |
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$username = $this->config['USERNAME']; |
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$password = $this->config['PASSWORD']; |
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try { |
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$pdo = new PDO($dsn, $username, $password, $this->options); |
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} catch (\Exception $e) { |
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$pdo = $this->tryAgainIfCausedByLostConnection( |
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$e, $dsn, $username, $password, $this->options |
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); |
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} |
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return $pdo; |
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} |
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/** |
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* Get the default PDO connection options. |
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* |
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* @return array |
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*/ |
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public function getDefaultOptions() |
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{ |
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return $this->options; |
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} |
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/** |
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* Set the default PDO connection options. |
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* |
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* @param array $options |
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* |
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* @return void |
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*/ |
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public function setDefaultOptions(array $options) |
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{ |
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$this->options = $options; |
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} |
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/** |
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* Handle a exception that occurred during connect execution. |
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* |
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* @param \Exception $e |
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* @param string $dsn |
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* @param string $username |
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* @param string $password |
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* @param array $options |
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* |
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* @throws \Exception |
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* |
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* @return \PDO |
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*/ |
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protected function tryAgainIfCausedByLostConnection(\Exception $e, $dsn, $username, $password, $options) |
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{ |
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if ($this->causedByLostConnection($e)) { |
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return new PDO($dsn, $username, $password, $options); |
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} |
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throw $e; |
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} |
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/** |
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* Determine if the given exception was caused by a lost connection. |
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* |
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* @param \Exception $e |
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* |
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* @return bool |
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*/ |
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protected function causedByLostConnection(\Exception $e) |
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{ |
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$message = $e->getMessage(); |
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return Helpers::contains($message, [ |
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'server has gone away', |
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'no connection to the server', |
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'Lost connection', |
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'is dead or not enabled', |
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'Error while sending', |
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'decryption failed or bad record mac', |
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'SSL connection has been closed unexpectedly', |
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'Deadlock found when trying to get lock', |
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]); |
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} |
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/** |
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* Load needed configuration values from the .env file using Dotenv. |
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* |
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* @return void |
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*/ |
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public function loadEnv() |
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{ |
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if (!getenv('APP_ENV')) { |
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$dotenv = new \Dotenv\Dotenv(__DIR__.'/../../../'); |
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$dotenv->overload(); |
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} |
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174
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} |
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175
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} |
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176
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andela-joyebanji /
PotatoORM
