Replaced `==` with `===` and `!=` with `!==` in /system/database
diff --git a/system/database/DB_forge.php b/system/database/DB_forge.php
index a519575..ff5eb3f 100644
--- a/system/database/DB_forge.php
+++ b/system/database/DB_forge.php
@@ -85,7 +85,7 @@
 	 */
 	public function drop_database($db_name)
 	{
-		if ($db_name == '')
+		if ($db_name === '')
 		{
 			show_error('A table name is required for that operation.');
 			return FALSE;
@@ -123,7 +123,7 @@
 			return;
 		}
 
-		if ($key == '')
+		if ($key === '')
 		{
 			show_error('Key information is required for that operation.');
 		}
@@ -150,7 +150,7 @@
 	 */
 	public function add_field($field = '')
 	{
-		if ($field == '')
+		if ($field === '')
 		{
 			show_error('Field information is required.');
 		}
@@ -197,7 +197,7 @@
 	 */
 	public function create_table($table = '', $if_not_exists = FALSE)
 	{
-		if ($table == '')
+		if ($table === '')
 		{
 			show_error('A table name is required for that operation.');
 		}
@@ -222,7 +222,7 @@
 	 */
 	public function drop_table($table_name)
 	{
-		if ($table_name == '')
+		if ($table_name === '')
 		{
 			return ($this->db->db_debug) ? $this->db->display_error('db_table_name_required') : FALSE;
 		}
@@ -245,7 +245,7 @@
 	 */
 	public function rename_table($table_name, $new_table_name)
 	{
-		if ($table_name == '' OR $new_table_name == '')
+		if ($table_name === '' OR $new_table_name === '')
 		{
 			show_error('A table name is required for that operation.');
 			return FALSE;
@@ -273,7 +273,7 @@
 	 */
 	public function add_column($table = '', $field = array(), $after_field = '')
 	{
-		if ($table == '')
+		if ($table === '')
 		{
 			show_error('A table name is required for that operation.');
 		}
@@ -284,7 +284,7 @@
 		{
 			$this->add_field(array($k => $field[$k]));
 
-			if (count($this->fields) == 0)
+			if (count($this->fields) === 0)
 			{
 				show_error('Field information is required.');
 			}
@@ -312,12 +312,12 @@
 	 */
 	public function drop_column($table = '', $column_name = '')
 	{
-		if ($table == '')
+		if ($table === '')
 		{
 			show_error('A table name is required for that operation.');
 		}
 
-		if ($column_name == '')
+		if ($column_name === '')
 		{
 			show_error('A column name is required for that operation.');
 		}
@@ -337,7 +337,7 @@
 	 */
 	public function modify_column($table = '', $field = array())
 	{
-		if ($table == '')
+		if ($table === '')
 		{
 			show_error('A table name is required for that operation.');
 		}