Added backticks to column names when using insert_string and update_string.  Relates to this bug report:  http://codeigniter.com/bug_tracker/bug/4509/
diff --git a/system/database/drivers/mysql/mysql_driver.php b/system/database/drivers/mysql/mysql_driver.php
index 9d9b651..de372e6 100644
--- a/system/database/drivers/mysql/mysql_driver.php
+++ b/system/database/drivers/mysql/mysql_driver.php
@@ -398,6 +398,22 @@
 	{

 		return mysql_errno($this->conn_id);

 	}

+

+	// --------------------------------------------------------------------

+

+	/**

+	 * Escape Column Name

+	 *

+	 * This function adds backticks around supplied column name

+	 *

+	 * @access	private

+	 * @param	string	the column name

+	 * @return	string

+	 */

+	function _escape_column($column)

+	{

+		return '`' .$column. '`';

+	}

 	

 	// --------------------------------------------------------------------