Updated version function to use PDO constant
diff --git a/system/database/drivers/pdo/pdo_driver.php b/system/database/drivers/pdo/pdo_driver.php
index d1bec44..b0a16d9 100644
--- a/system/database/drivers/pdo/pdo_driver.php
+++ b/system/database/drivers/pdo/pdo_driver.php
@@ -147,7 +147,7 @@
 	 */
 	function _version()
 	{
-		return "SELECT version() AS ver";
+		return $this->conn_id->getAttribute(PDO::ATTR_CLIENT_VERSION);
 	}
 
 	// --------------------------------------------------------------------