frienddaohibernate.java

STRUTS数据库项目开发宝典

package com.relationinfo.dao.hibernate;

import java.util.List;

import com.relationinfo.model.Friend;
import com.relationinfo.dao.FriendDAO;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.criterion.Example;
import org.hibernate.criterion.MatchMode;

import org.springframework.orm.ObjectRetrievalFailureException;
import org.springframework.orm.hibernate3.HibernateCallback;

public class FriendDAOHibernate extends BaseDAOHibernate implements FriendDAO {

    /**
     * @see com.relationinfo.dao.FriendDAO#getFriends(com.relationinfo.model.Friend)
     */
    public List getFriends(final Friend friend) {
        if (friend == null) {
            return getHibernateTemplate().find("from Friend");
        } else {
            // filter on properties set in the friend
            HibernateCallback callback = new HibernateCallback() {
                public Object doInHibernate(Session session) throws HibernateException {
                    Example ex = Example.create(friend).ignoreCase().enableLike(MatchMode.ANYWHERE);
                    return session.createCriteria(Friend.class).add(ex).list();
                }
            };
            return (List) getHibernateTemplate().execute(callback);
        }
    }

    /**
     * @see com.relationinfo.dao.FriendDAO#getFriend(String friendcode)
     */
    public Friend getFriend(final String friendcode) {
        Friend friend = (Friend) getHibernateTemplate().get(Friend.class, friendcode);
        if (friend == null) {
            log.warn("uh oh, friend with friendcode '" + friendcode + "' not found...");
            throw new ObjectRetrievalFailureException(Friend.class, friendcode);
        }

        return friend;
    }

    /**
     * @see com.relationinfo.dao.FriendDAO#saveFriend(Friend friend)
     */    
    public void saveFriend(final Friend friend) {
        getHibernateTemplate().saveOrUpdate(friend);
    }

    /**
     * @see com.relationinfo.dao.FriendDAO#removeFriend(String friendcode)
     */
    public void removeFriend(final String friendcode) {
        getHibernateTemplate().delete(getFriend(friendcode));
    }
}