QBC查询:Query By Criteria,条件查询。是一种更加面向对象化的查询的方式。
简单查询
// 获得Criteria的对象
Criteria criteria = session.createCriteria(Customer.class);
List<Customer> list = criteria.list();
排序查询
// 排序查询
Criteria criteria = session.createCriteria(Customer.class);
// criteria.addOrder(Order.asc("cust_id")); // 升序
criteria.addOrder(Order.desc("cust_id")); // 降序
List<Customer> list = criteria.list();
分页查询
// 分页查询
Criteria criteria = session.createCriteria(LinkMan.class);
criteria.setFirstResult(10);
criteria.setMaxResults(10);
List<LinkMan> list = criteria.list();
条件查询
// 条件查询
Criteria criteria = session.createCriteria(Customer.class);
// 设置条件:
/**
* = eq
* > gt
* >= ge
* < lt
* <= le
* <> ne
* like
* in
* and
* or
*/
criteria.add(Restrictions.eq("cust_source", "小广告"));
// criteria.add(Restrictions.or(Restrictions.like("cust_name", "李%")));
criteria.add(Restrictions.like("cust_name", "李%"));
List<Customer> list = criteria.list();
统计查询
Criteria criteria = session.createCriteria(Customer.class);
/**
* add :普通的条件。where后面条件
* addOrder :排序
* setProjection :聚合函数 和 group by having
*/
criteria.setProjection(Projections.rowCount());
Long num = (Long) criteria.uniqueResult();
离线条件查询
查询完再传进session
DetachedCriteria detachedCriteria = DetachedCriteria.forClass(Customer.class);
detachedCriteria.add(Restrictions.like("cust_name", "李%"));
Session session = HibernateUtils.getCurrentSession();
Transaction transaction = session.beginTransaction();
Criteria criteria = detachedCriteria.getExecutableCriteria(session);
List<Customer> list = criteria.list();
SQL查询
SQLQuery sqlQuery = session.createSQLQuery("select * from cst_customer");
sqlQuery.addEntity(Customer.class);
List<Customer> list = sqlQuery.list();