创建实体类对象：
package domain;import java.util.HashSet;import java.util.Set;//客户实体public class Customer { ???????private Long cust_id; ???private String cust_name; ???private String cust_source; ???private String cust_industry; ???private String cust_level; ???private String cust_linkman; ???private String cust_phone; ???private String cust_mobile; ???//使用set集合,表达一对多关系 ???private Set<LinkMan> linkMens = new HashSet<LinkMan>(); ???public Set<LinkMan> getLinkMens() { ???????return linkMens; ???} ???public void setLinkMens(Set<LinkMan> linkMens) { ???????this.linkMens = linkMens; ???} ???public Long getCust_id() { ???????return cust_id; ???} ???public void setCust_id(Long cust_id) { ???????this.cust_id = cust_id; ???} ???public String getCust_name() { ???????return cust_name; ???} ???public void setCust_name(String cust_name) { ???????this.cust_name = cust_name; ???} ???public String getCust_source() { ???????return cust_source; ???} ???public void setCust_source(String cust_source) { ???????this.cust_source = cust_source; ???} ???public String getCust_industry() { ???????return cust_industry; ???} ???public void setCust_industry(String cust_industry) { ???????this.cust_industry = cust_industry; ???} ???public String getCust_level() { ???????return cust_level; ???} ???public void setCust_level(String cust_level) { ???????this.cust_level = cust_level; ???} ???public String getCust_linkman() { ???????return cust_linkman; ???} ???public void setCust_linkman(String cust_linkman) { ???????this.cust_linkman = cust_linkman; ???} ???public String getCust_phone() { ???????return cust_phone; ???} ???public void setCust_phone(String cust_phone) { ???????this.cust_phone = cust_phone; ???} ???public String getCust_mobile() { ???????return cust_mobile; ???} ???public void setCust_mobile(String cust_mobile) { ???????this.cust_mobile = cust_mobile; ???} ???@Override ???public String toString() { ???????return "Customer [cust_id=" + cust_id + ", cust_name=" + cust_name + "]"; ???}}自定义工具类：
package utils;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.cfg.Configuration;public class HibernateUtils { ???private static SessionFactory sf; ???????static{ ???????//1 创建,调用空参构造 ???????Configuration conf = new Configuration().configure(); ???????//2 根据配置信息,创建 SessionFactory对象 ????????sf = conf.buildSessionFactory(); ???} ???????//获得session => 获得全新session ???public static Session openSession(){ ???????????????//3 获得session ???????????????Session session = sf.openSession(); ???????????????????????????????return session; ???????????} ???//获得session => 获得与线程绑定的session ???public static Session getCurrentSession(){ ???????//3 获得session ???????Session session = sf.getCurrentSession(); ???????????????return session; ???} ???}测试类示例：
基本语法：
package criteria;import java.util.List;import org.hibernate.Criteria;import org.hibernate.Session;import org.hibernate.Transaction;import org.hibernate.criterion.Order;import org.hibernate.criterion.Projections;import org.hibernate.criterion.Restrictions;import org.junit.Test;import domain.Customer;import utils.HibernateUtils;//学习Criteria语法public class Demo { ???????@Test ???//基本语法 ???public void fun1(){ ???????Session session = HibernateUtils.openSession(); ???????Transaction tx = session.beginTransaction(); ???????//---------------------------------------------------- ???????????????Criteria c = session.createCriteria(Customer.class); ???????????????List<Customer> list = c.list(); ???????????????System.out.println(list); ???????????????//---------------------------------------------------- ???????tx.commit(); ???????session.close(); ???????????} ???????@Test ???//条件语法 ???// > ????????????????gt ???// >= ???????????????ge ???// < ???????????????lt ???// <= ???????????????le ???// == ???????????????eq ???// != ???????????????ne ???// in ???????????????in ???// between and ???????between ???// like ????????????like ???// is not null ????????isNotNull ???// is null ???????????isNull ???// or ???????????????or ???// and ???????????????and ???public void fun2(){ ???????Session session = HibernateUtils.openSession(); ???????Transaction tx = session.beginTransaction(); ???????//---------------------------------------------------- ???????????????Criteria c = session.createCriteria(Customer.class); ???????// ???????c.add(Restrictions.idEq(2l)); ???????c.add(Restrictions.eq("cust_id",2l)); ???????????????List<Customer> list = c.list(); ???????????????System.out.println(list); ???????????????//---------------------------------------------------- ???????tx.commit(); ???????session.close(); ???????????} ???????@Test ???//分页语法 - 与HQL一样 ???public void fun3(){ ???????Session session = HibernateUtils.openSession(); ???????Transaction tx = session.beginTransaction(); ???????//---------------------------------------------------- ???????????????Criteria c = session.createCriteria(Customer.class); ???????//limit ?,? ????????c.setFirstResult(0); ???????c.setMaxResults(2); ???????????????List<Customer> list = c.list(); ???????????????System.out.println(list); ???????????????//---------------------------------------------------- ???????tx.commit(); ???????session.close(); ???????????} ???????@Test ???//排序语法 ????public void fun4(){ ???????Session session = HibernateUtils.openSession(); ???????Transaction tx = session.beginTransaction(); ???????//---------------------------------------------------- ???????????????Criteria c = session.createCriteria(Customer.class); ???????????????c.addOrder(Order.asc("cust_id"));//升序 ???????//c.addOrder(Order.desc("cust_id"));降序 ???????????????List<Customer> list = c.list(); ???????????????System.out.println(list); ???????????????//---------------------------------------------------- ???????tx.commit(); ???????session.close(); ???????????} ???????@Test ???//统计语法 ????public void fun5(){ ???????Session session = HibernateUtils.openSession(); ???????Transaction tx = session.beginTransaction(); ???????//---------------------------------------------------- ???????????????Criteria c = session.createCriteria(Customer.class); ???????????????//设置查询目标（聚合函数） ???????c.setProjection(Projections.rowCount()); ???????????????List list = c.list(); ???????????????System.out.println(list); ???????????????//---------------------------------------------------- ???????tx.commit(); ???????session.close(); ???????????} ???????}离线查询：
传统criteria对象创建依赖于session，前端传递查询条件依次经过WEB、SERVICE层到DAO层，
在DAO层组装查询条件到criteria后执行查询
离线的criteria对象，于session无关，凭空创建，可以在WEB层创建criteria对象并组装查询条件，
这时候直接传递criteria对象到DAO层查询即可，这时候就做到了一个DAO方法适用于所有查询
package criteria;import java.util.List;import org.hibernate.Criteria;import org.hibernate.Session;import org.hibernate.Transaction;import org.hibernate.criterion.DetachedCriteria;import org.hibernate.criterion.Order;import org.hibernate.criterion.Projections;import org.hibernate.criterion.Restrictions;import org.junit.Test;import domain.Customer;import utils.HibernateUtils;//学习离线Criteriapublic class Demo2 { ???????@Test ???public void fun1(){ ???????//Service/web层 ???????DetachedCriteria dc ?= DetachedCriteria.forClass(Customer.class); ???????????????dc.add(Restrictions.idEq(5l));//拼装条件(全部与普通Criteria一致) ???????????????//---------------------------------------------------- ???????Session session = HibernateUtils.openSession(); ???????Transaction tx = session.beginTransaction(); ???????//---------------------------------------------------- ???????//Dao层 ???????Criteria c = dc.getExecutableCriteria(session); ???????????????List list = c.list(); ???????????????System.out.println(list); ???????//---------------------------------------------------- ???????tx.commit(); ???????session.close(); ???????????} ???}hibernate框架学习笔记11：Criteria查询详解
原文地址：https://www.cnblogs.com/xuyiqing/p/8454906.html