Add API tests

include/dba.php

@@ -102,6 +102,15 @@ class dba {
 		return self::$connected;
 	}
 
+	/**
+	 * Return the database object.
+	 * @return PDO|mysqli
+	 */
+	public static function get_db()
+	{
+		return self::$db;
+	}
+
 	/**
 	 * @brief Returns the MySQL server version string
 	 *