Add on delete and on update in migration files

how to add on update and on delete option to migration codes? for example , this:

new Reference(
  'posts_tags_user_id_foreign_key',
  array(
  'referencedSchema' => 'project_sophal',
  'referencedTable' => 'users',
  'columns' => array('user_id'),
  'referencedColumns' => array('id')
  )
 )