private function __construct()
{
if (!defined('PHPWS_DSN')) {
throw new Exception('Database connection DSN is not set.');
}
$dsnArray = \Database::parseDSN(PHPWS_DSN);
$dsn = $this->createDsn($dsnArray['dbtype'], $dsnArray['dbhost'], $dsnArray['dbname']);
$this->pdo = new \PDO($dsn, $dsnArray['dbuser'], $dsnArray['dbpass'], array(\PDO::ATTR_PERSISTENT => true));
// Make sure PDO will throw exceptions on error
$this->pdo->setAttribute(\PDO::ATTR_ERRMODE, \PDO::ERRMODE_EXCEPTION);
}
