DbUtils excute insert sql with datatime column always has xx:xx:00 result

Question

When I use DbUtils to insert SQL with a datetime column in MySQL), I always get a result like 2015-03-25 17:35:00, when the desired result is 2015-03-25 17:35:20, any ideas?

This is the SQL I'm using:

update user set last_changed=date_add(now(), interval 1 minute);