$member = M('member');

$where['id'] = 11;
$query = $member->where($where)->setField('birthday', '2016-06-244');
var_dump($query);

返回 int 1
但是数据库其实是报错的。因为birthday是date类型。
[2016-03-18 23:12:49] [22001][1292] Data truncation: Incorrect date value: '2016-06-244' for column 'birthday' at row 1