new MigrationVersion Model

application/models/MigrationVersion.php

@@ -0,0 +1,20 @@
+<?php
+
+class MigrationVersion extends CI_Model {
+
+	function getMigrationVersion() {
+        $this->db->select_max('version');
+        $query = $this->db->get('migrations');
+        $migration_version = $query->row();
+
+        if ($query->num_rows() == 1) {
+            $migration_version = $query->row()->version;
+            return $migration_version;
+        } else {
+            return null;
+        }
+    }
+
+}
+
+?>