Extend fix for #798 to work across all DB drivers instead of just mysql
diff --git a/system/database/DB_active_rec.php b/system/database/DB_active_rec.php
index a19f9be..f921107 100644
--- a/system/database/DB_active_rec.php
+++ b/system/database/DB_active_rec.php
@@ -1546,17 +1546,25 @@
 	 * @param	array	the where clause
 	 * @param	array	the orderby clause
 	 * @param	array	the limit clause
+	 * @param	array	the like clause
 	 * @return	string
 	 */
-	protected function _update($table, $values, $where, $orderby = array(), $limit = FALSE)
+	protected function _update($table, $values, $where, $orderby = array(), $limit = FALSE, $like = array())
 	{
 		foreach ($values as $key => $val)
 		{
 			$valstr[] = $key.' = '.$val;
 		}
 
+		$where = empty($where) ? '' : ' WHERE '.implode(' ', $where);
+
+		if ( ! empty($like))
+		{
+			$where .= ($where === '' ? ' WHERE ' : ' AND ').implode(' ', $like);
+		}
+
 		return 'UPDATE '.$table.' SET '.implode(', ', $valstr)
-			.(($where != '' && count($where) > 0) ? ' WHERE '.implode(' ', $where) : '')
+			.$where
 			.(count($orderby) > 0 ? ' ORDER BY '.implode(', ', $orderby) : '')
 			.($limit ? ' LIMIT '.$limit : '');
 	}