/**
* Attempts to connect to database.
*
* @return void
* @throws \RuntimeException
*/
private function connect()
{
$dsn = "{$this->credentials->getDriver()}:host={$this->credentials->getHost()}";
try {
$pdo = new \PDO($dsn, $this->credentials->getUsername(), $this->credentials->getPassword());
} catch (\PDOException $e) {
throw new \RuntimeException('Failed to connect to database.', 0, $e);
}
$pdo->setAttribute(\PDO::ATTR_ERRMODE, \PDO::ERRMODE_EXCEPTION);
$pdo->setAttribute(\PDO::ATTR_DEFAULT_FETCH_MODE, \PDO::FETCH_ASSOC);
$this->pdo = $pdo;
if (!is_null($this->credentials->getCharset())) {
$this->setCharset($this->credentials->getCharset());
}
if (!is_null($this->credentials->getDatabase())) {
$this->selectDatabase($this->credentials->getDatabase());
}
}