How to create Migration from Mysql DB with bigint type of Mysql

I have to create Migration file form Mysql DB
But I want type of Migration equivalent with Mysql DB
(example : in Mysql with type Bigint and in Migration will have type
Int(20) or Bigint)
Could You help me solve this Problem?

On Fri, Jun 21, 2013 at 3:24 PM, haxuan lac [email protected]