hibernate Restrictions用法

 

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

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.liek("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;

 

 

 

 

实例代码: 

 

public PaginationSupport getCsSubsidyVerifysByDwr(DwrBackParams params) {
		int pageSize = params.getLimit();
		int currentPage = params.getStart() / pageSize + 1;
		boolean isRecount = params.isReCount();
		Map map = this.dwrParams2Map(params);
		
		String fromDate 	= (String) map.get("fromDate");
    	String toDate 		= (String) map.get("toDate");
    	String subsidyType 	= (String) map.get("subsidyType");
    	String invoiceNo 	= (String) map.get("invoiceNo");
     	String personName 	= (String) map.get("personName");
    	String personNo 	= (String) map.get("personNo");
    	String orgCd 		= (String) map.get("orgCd");
    	String auditIsSucc 	= (String) map.get("auditIsSucc");
		
    	Timestamp from = DateOperator.stringToTimestampStar(fromDate);
    	Timestamp to   = DateOperator.stringToTimestampEnd(toDate);
    	
		DetachedCriteria criteria = DetachedCriteria.forClass(CsSubsidyVerify.class);
		criteria
			.add(Restrictions.eq("dataState", DatabaseConstants.DATA_STATE_DEFAULT))
			.add(Restrictions.eq("businessYear", getBussinesYear()))
			.add(Restrictions.between("inputDate", from, to));
		
		if (StringUtils.isNotBlank(auditIsSucc))
			criteria.add(Restrictions.eq("auditIsSucc", auditIsSucc));
		if (StringUtils.isNotBlank(subsidyType))
			criteria.add(Restrictions.eq("subsidyType", subsidyType));
		if (StringUtils.isNotBlank(invoiceNo))
			criteria.add(Restrictions.like("invoiceNo", invoiceNo, MatchMode.START));
		if (StringUtils.isNotBlank(personNo))
			criteria.add(Restrictions.like("personNo", personNo, MatchMode.START));
		if (StringUtils.isNotBlank(personName))
			criteria.add(Restrictions.like("personName", personName, MatchMode.START));
		if (StringUtils.isNotBlank(orgCd))
			criteria.add(Restrictions.like("orgCd", orgCd, MatchMode.START));
		
		PaginationSupport ps = dao.findPageByCriteria(criteria, 
				Order.desc("inputDate"), currentPage, pageSize, isRecount);
		
		return ps;
	}