方法
说明
Restrictions.eq
＝
Restrictions.allEq
利用Map来进行多个等于的限制
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限定查询
有空再添加上，代码示例。
QBC常用限定方法
Restrictions.eq --> equal,等于.
Restrictions.allEq --> 参数为Map对象,使用key/value进行多个等于的比对,相当于多个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 --> 对应SQL的between子句
Restrictions.like --> 对应SQL的LIKE子句
Restrictions.in --> 对应SQL的in子句
Restrictions.and --> and 关系
Restrictions.or --> or 关系
Restrictions.isNull --> 判断属性是否为空,为空则返回true
Restrictions.isNotNull --> 与isNull相反
Restrictions.sqlRestriction --> SQL限定的查询
Order.asc --> 根据传入的字段进行升序排序
Order.desc --> 根据传入的字段进行降序排序
MatchMode.EXACT --> 字符串精确匹配.相当于"like 'value'"
MatchMode.ANYWHERE --> 字符串在中间匹配.相当于"like '%value%'"
MatchMode.START --> 字符串在最前面的位置.相当于"like 'value%'"
MatchMode.END --> 字符串在最后面的位置.相当于"like '%value'"
例子查询年龄在20-30岁之间的所有学生对象List list = session.createCriteria(Student.class).add(Restrictions.between("age",new Integer(20),new Integer(30)).list();查询学生姓名在AAA,BBB,CCC之间的学生对象String[] names = {"AAA","BBB","CCC"};List list = session.createCriteria(Student.class).add(Restrictions.in("name",names)).list();查询年龄为空的学生对象List list = session.createCriteria(Student.class).add(Restrictions.isNull("age")).list();查询年龄等于20或者年龄为空的学生对象List list = session.createCriteria(Student.class).add(Restrictions.or(Restrictions.eq("age",new Integer(20)),Restrictions.isNull("age")).list();
--------------------------------------------------------------------使用QBC实现动态查询 public List findStudents(String name,int age){
Criteria criteria = session.createCriteria(Student.class);if(name != null){criteria.add(Restrictions.like("name",name,MatchMode.ANYWHERE));}if(age != 0){criteria.add(Restrictions.eq("age",new Integer(age)));}criteria.addOrder(Order.asc("name"));//根据名字升序排列return criteria.list();}
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今天用了写hibernate高级查询时用了Restrictions(当然Expression也是可以以的)这个类.感觉不错.下面的代码写的不易读.其实核心就是一句Restrictions.or(Restrictions.like(),Restrictions.or(Restrictions.like,........))里面的or可以无限加的.还是比较好用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;
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