Using LIKE wildcard in prepared statement

Using “like” wildcard in prepared statement

Query : SELECT COUNT(o.orders_id) AS orders,ROUND(SUM(o.totalproduct),0) AS ordersum,ROUND(AVG(o.totalproduct),0) AS orderavg FROM orders o, users usr WHERE o.member_id=usr.users_id and  o.timeplaced like  ? and usr.field1='IU' and o.status='M'

In Java:

String mmSearch = "%";

            Set<String> keys = previousOrdersDateMap.keySet();

            for(String key: keys){

               if(null != key){

                               key = mmSearch+key+mmSearch;

                PreparedStatement preparedStatement = conn.prepareStatement(detQryType);

                preparedStatement.setString(1,key);