Hibernate

方法	說明
Restrictions.eq	＝
Restrictions.allEq	利用Map來進行多個等於的限制
Restrictions.gt	＞
Restrictions.ge	＞＝
Restrictions.lt	＜
Restrictions.le	＜＝
Restrictions.between	BETWEEN
Restrictions.like	LIKE
Restrictions.in	in
Restrictions.and	and
Restrictions.or	or
Restrictions.sqlRestriction	用SQL限定查詢

DetachedCriteria criteria = DetachedCriteria
    .forClass(Transferimagesinfo.class);

criteria.add(Restrictions.like("userId", "%"+userid+"%"));

例子
查詢年齡在20-30歲之間的所有學生對象
List list = session.createCriteria(Student.class)
      .add(Restrictions.between("age",new Integer(20),new Integer(30)).list();
查詢學生姓名在AAA,BBB,CCC之間的學生對象
String[] names = {"AAA","BBB","CCC"};
List list = session.createCriteria(Student.class)
      .add(Restrictions.in("name",names)).list();
查詢年齡爲空的學生對象
List list = session.createCriteria(Student.class)
      .add(Restrictions.isNull("age")).list();
查詢年齡等於20或者年齡爲空的學生對象
List list = session.createCriteria(Student.class)
      .add(Restrictions.or(Restrictions.eq("age",new Integer(20)),
                 Restrictions.isNull("age")).list();

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使用QBC實現動態查詢 
public List findStudents(String name,int age){

 Criteria criteria = session.createCriteria(Student.class);
 if(name != null){
  criteria.add(Restrictions.liek("name",name,MatchMode.ANYWHERE));
 }
 if(age != 0){
  criteria.add(Restrictions.eq("age",new Integer(age)));
 }
 criteria.addOrder(Order.asc("name"));//根據名字升序排列
 return criteria.list();
}

 

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今天用了寫hibernate高級查詢時用了Restrictions(當然Expression也是可以以的)這個類.感覺不錯.
下面的代碼寫的不易讀.其實核心就是一句
Restrictions.or(Restrictions.like(),Restrictions.or(Restrictions.like,........))
裏面的or可以無限加的.還是比較好用

Session session = getHibernateTemplate().getSessionFactory()
                .openSession();
        Criteria criteria = session.createCriteria(Film.class);
        List<Film> list = criteria.add(
            Restrictions.or(Restrictions.like("description", key,MatchMode.ANYWHERE),
            Restrictions.or(Restrictions.like("name", key,MatchMode.ANYWHERE),
                Restrictions.or(    Restrictions.like("direct", key,MatchMode.ANYWHERE),
                Restrictions.or(Restrictions.like("mainplay",key,MatchMode.ANYWHERE),
                        Restrictions.like("filearea", key,MatchMode.ANYWHERE)))))).list();

        session.close();
        return list;