<?php
class Vendor_Feature_Migrate extends BClass
{
    public function run()
    {
        BMigrate::install('0.1.0', array($this, 'install'));
        BMigrate::upgrade('0.1.0', '0.1.1', array($this, 'upgrade_0_1_1'));
    }
  
    public function install()
    {
        Vendor_Feature_Model_Thing::i()->install();
        BDb::run("
//...  
        ");
    }
  
    public function upgrade_0_1_1() 
    {
        BDb::run("
//...  
        ");  
    }
}