方法說明

2，QBC常用限定方法

Restrictions.eq --> equal,等于.

Restrictions.allEq --> 參數為Map對象,使用key/value進行多個等于的比對,相當于多個Restrictions.eq的效果

Restrictions.gt --> great-than > 大于

Restrictions.ge --> great-equal >= 大于等于

Restrictions.lt --> less-than, < 小于

Restrictions.le --> less-equal <= 小于等于

Restrictions.between --> 對應SQL的between子句

Restrictions.like --> 對應SQL的LIKE子句

Restrictions.in --> 對應SQL的in子句

Restrictions.and --> and 關系

Restrictions.or --> or 關系

Restrictions.isNull --> 判斷屬性是否為空,為空則返回true

Restrictions.isNotNull --> 與isNull相反

Restrictions.sqlRestriction --> SQL限定的查詢

Order.asc --> 根據傳入的字段進行升序排序

Order.desc --> 根據傳入的字段進行降序排序

MatchMode.EXACT --> 字符串精確匹配.相當于"like 'value'"

MatchMode.ANYWHERE --> 字符串在中間匹配.相當于"like '%value%'"

MatchMode.START --> 字符串在最前面的位置.相當于"like 'value%'"

MatchMode.END --> 字符串在最后面的位置.相當于"like '%value'"

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();查詢年齡為空的學生對象List list = session.createCriteria(Student.class)      .add(Restrictions.isNull("age")).list();查詢年齡等于20或者年齡為空的學生對象List list = session.createCriteria(Student.class)      .add(Restrictions.or(Restrictions.eq("age",new Integer(20)),                 Restrictions.isNull("age")).list();

--------------------------------------------------------------------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,........))里面的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;