BlogJava-◎ヤ撧吥菔瀭o┊。``。-随笔分类-Spring

BlogJava-◎ヤ撧吥菔瀭o┊。``。-随笔分类-Springhttp://www.blogjava.net/hllwuxin/category/25994.html刪除昨天啲煩惱.﹖選擇今天啲快樂.﹖設置明天啲幸福.﹖ zh-cnWed, 19 Sep 2007 05:25:40 GMTWed, 19 Sep 2007 05:25:40 GMT60Spring的回调HibernateCallBack方法http://www.blogjava.net/hllwuxin/archive/2007/09/19/146439.html優雅Ｄě頽廢優雅Ｄě頽廢Wed, 19 Sep 2007 05:25:00 GMThttp://www.blogjava.net/hllwuxin/archive/2007/09/19/146439.htmlhttp://www.blogjava.net/hllwuxin/comments/146439.htmlhttp://www.blogjava.net/hllwuxin/archive/2007/09/19/146439.html#Feedback0http://www.blogjava.net/hllwuxin/comments/commentRss/146439.htmlhttp://www.blogjava.net/hllwuxin/services/trackbacks/146439.html public class UsersDAO extends HibernateDaoSupport {
......
public List getUsers() {
return getHibernateTemplate().executeFind(new HibernateCallback() {
public Object doInHibernate(Session s) throws HibernateException,
SQLException {
Query query = s.createQuery("From Users AS user ORDER BY user.username DESC");
List list = query.list();
return list;
}
});
}
......
}
但是这样的代码很难让人理解,可以将其打包
package com.notepad.comm;
import java.sql.SQLException;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.springframework.orm.hibernate3.HibernateCallback;
public class HQLCallBackUtil implements HibernateCallback {
private String hql;

public HQLCallBackUtil(){

}

public HQLCallBackUtil(String hql){
this.hql=hql;
}
public String getHql() {
return hql;
}
public void setHql(String hql) {
this.hql = hql;
}
public Object doInHibernate(Session s) throws HibernateException,
SQLException {
if (hql == null || hql.equals("")) {
throw new HibernateException("Can't execute NULL hql!");
}
return s.createQuery(hql).list();
}
}
然后可以通过如下代码进行调用
public class UsersDAO extends HibernateDaoSupport {
......
public List getUsers() {
HQLCallBackUtil callBack=new HQLCallBackUtil();
callBack.setHql("From Users AS user ORDER BY user.username DESC");
return this.getHibernateTemplate().executeFind(callBack);
}
......
}

優雅Ｄě頽廢 2007-09-19 13:25 发表评论

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