Made the rest of the db classes abstract \n
except for the DB_cache class, because I'm not sure if it is directly called
diff --git a/system/database/DB_forge.php b/system/database/DB_forge.php
index fe2a677..192b78f 100644
--- a/system/database/DB_forge.php
+++ b/system/database/DB_forge.php
@@ -34,7 +34,7 @@
* @author EllisLab Dev Team
* @link http://codeigniter.com/user_guide/database/
*/
-class CI_DB_forge {
+abstract class CI_DB_forge {
public $fields = array();
public $keys = array();
diff --git a/system/database/DB_result.php b/system/database/DB_result.php
index c3cdd24..d0205e0 100644
--- a/system/database/DB_result.php
+++ b/system/database/DB_result.php
@@ -36,7 +36,7 @@
* @author EllisLab Dev Team
* @link http://codeigniter.com/user_guide/database/
*/
-class CI_DB_result {
+abstract class CI_DB_result {
public $conn_id = NULL;
public $result_id = NULL;
diff --git a/system/database/DB_utility.php b/system/database/DB_utility.php
index c94f93e..a7db803 100644
--- a/system/database/DB_utility.php
+++ b/system/database/DB_utility.php
@@ -32,7 +32,7 @@
* @author EllisLab Dev Team
* @link http://codeigniter.com/user_guide/database/
*/
-class CI_DB_utility extends CI_DB_forge {
+abstract class CI_DB_utility extends CI_DB_forge {
public $db;
public $data_cache = array();