所有项目导入对应的hibernate的jar包、mysql的jar包和添加每次都需要用到的HibernateUtil.java

第一节：Hibernate 查询方式简介

1，导航对象图查询方式；

2，OID 查询方式；

3，本地SQL 查询方式；

4，HQL 查询方式；

5，QBC 查询方式；(Query By Criteria)

第二节：本地SQL 查询方式

Student.java

 package com.wishwzp.model;

 public class Student {

     private int id;

     private String name;

     private int age;

     public int getId() {

         return id;

     }

     public void setId(int id) {

         this.id = id;

     }

     public String getName() {

         return name;

     }

     public void setName(String name) {

         this.name = name;

     }

     public int getAge() {

         return age;

     }

     public void setAge(int age) {

         this.age = age;

     }

     @Override

     public String toString() {

         return "Student [id=" + id + ", name=" + name + ", age=" + age + "]";

     }

 }

Student.hbm.xml

 <?xml version="1.0"?>

 <!DOCTYPE hibernate-mapping PUBLIC

         "-//Hibernate/Hibernate Mapping DTD 3.0//EN"

         "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">

 <hibernate-mapping package="com.wishwzp.model">

     <class name="Student" table="t_student">

         <id name="id" column="stuId">

             <generator class="native"></generator>

         </id>

         <property name="name" column="stuName"></property>

         <property name="age" column="stuAge"></property>

     </class>

 </hibernate-mapping>

hibernate.cfg.xml

 <?xml version='1.0' encoding='utf-8'?>

 <!DOCTYPE hibernate-configuration PUBLIC

         "-//Hibernate/Hibernate Configuration DTD 3.0//EN"

         "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

 <hibernate-configuration>

     <session-factory>

         <!--数据库连接设置 -->

         <property name="connection.driver_class">com.mysql.jdbc.Driver</property>

         <property name="connection.url">jdbc:mysql://localhost:3306/hibernate</property>

         <property name="connection.username">root</property>

         <property name="connection.password">123456</property>

         <!-- 方言 -->

         <property name="dialect">org.hibernate.dialect.MySQL5Dialect</property>

         <!-- 控制台显示SQL -->

         <property name="show_sql">true</property>

         <!-- 自动更新表结构 -->

         <property name="hbm2ddl.auto">update</property>

           <mapping resource="com/wishwzp/model/Student.hbm.xml"/>

     </session-factory>

 </hibernate-configuration>

StudentTest.java

 package com.wishwzp.service;

 import java.util.Iterator;

 import java.util.List;

 import org.hibernate.Query;

 import org.hibernate.Session;

 import org.hibernate.SessionFactory;

 import org.junit.After;

 import org.junit.Before;

 import org.junit.Test;

 import com.wishwzp.model.Student;

 import com.wishwzp.util.HibernateUtil;

 public class StudentTest {

     private SessionFactory sessionFactory=HibernateUtil.getSessionFactory();

     private Session session;

     @Before

     public void setUp() throws Exception {

         session=sessionFactory.openSession(); // 生成一个session

         session.beginTransaction(); // 开启事务

     }

     @After

     public void tearDown() throws Exception {

          session.getTransaction().commit(); // 提交事务

          session.close(); // 关闭session

     }

     @Test

     public void testSQLQuery() {

     }

 }

运行结果生成了数据库信息：

我们插入一些数据：

再次写代码查询里面的数据：

StudentTest.java

 package com.wishwzp.service;

 import java.util.Iterator;

 import java.util.List;

 import org.hibernate.Query;

 import org.hibernate.Session;

 import org.hibernate.SessionFactory;

 import org.junit.After;

 import org.junit.Before;

 import org.junit.Test;

 import com.wishwzp.model.Student;

 import com.wishwzp.util.HibernateUtil;

 public class StudentTest {

     private SessionFactory sessionFactory=HibernateUtil.getSessionFactory();

     private Session session;

     @Before

     public void setUp() throws Exception {

         session=sessionFactory.openSession(); // 生成一个session

         session.beginTransaction(); // 开启事务

     }

     @After

     public void tearDown() throws Exception {

          session.getTransaction().commit(); // 提交事务

          session.close(); // 关闭session

     }

     @Test

     public void testSQLQuery() {

         String sql="select * from t_student";

         Query query=session.createSQLQuery(sql).addEntity(Student.class);

         List studentList=query.list();

         Iterator it=studentList.iterator();

         while(it.hasNext()){

             Student s=(Student)it.next();

             System.out.println(s);

         }

     }

 }

运行结果显示：

我们写一个带参数的查询语句查询：

StudentTest.java

 package com.wishwzp.service;

 import java.util.Iterator;

 import java.util.List;

 import org.hibernate.Query;

 import org.hibernate.Session;

 import org.hibernate.SessionFactory;

 import org.junit.After;

 import org.junit.Before;

 import org.junit.Test;

 import com.wishwzp.model.Student;

 import com.wishwzp.util.HibernateUtil;

 public class StudentTest {

     private SessionFactory sessionFactory=HibernateUtil.getSessionFactory();

     private Session session;

     @Before

     public void setUp() throws Exception {

         session=sessionFactory.openSession(); // 生成一个session

         session.beginTransaction(); // 开启事务

     }

     @After

     public void tearDown() throws Exception {

          session.getTransaction().commit(); // 提交事务

          session.close(); // 关闭session

     }

     @Test

     public void testSQLQuery2() {

         String sql="select * from t_student where stuName like :stuName and stuAge=:stuAge";

         Query query=session.createSQLQuery(sql).addEntity(Student.class);

         query.setString("stuName", "张%");

         query.setInteger("stuAge", 10);

         List studentList=query.list();

         Iterator it=studentList.iterator();

         while(it.hasNext()){

             Student s=(Student)it.next();

             System.out.println(s);

         }

     }

 }

运行结果显示：

第三节：HQL 查询方式

HQL（Hibernate Query Language）是面向对象的查询语言；是使用最广的一种查询方式；

1，普通查询；

2，带条件查询；

3，使用别名；

4，对结果排序；

5，分页查询；

6，查询单个对象；

7，链式写法；

1，普通查询；

StudentTest.java

 package com.wishwzp.service;

 import java.util.Iterator;

 import java.util.List;

 import org.hibernate.Query;

 import org.hibernate.Session;

 import org.hibernate.SessionFactory;

 import org.junit.After;

 import org.junit.Before;

 import org.junit.Test;

 import com.wishwzp.model.Student;

 import com.wishwzp.util.HibernateUtil;

 public class StudentTest {

     private SessionFactory sessionFactory=HibernateUtil.getSessionFactory();

     private Session session;

     @Before

     public void setUp() throws Exception {

         session=sessionFactory.openSession(); // 生成一个session

         session.beginTransaction(); // 开启事务

     }

     @After

     public void tearDown() throws Exception {

          session.getTransaction().commit(); // 提交事务

          session.close(); // 关闭session

     }

     @Test

     public void testHQLQuery() {

         String hql="from Student";

         Query query=session.createQuery(hql);

         List<Student> studentList=(List<Student>)query.list();

         Iterator it=studentList.iterator();

         while(it.hasNext()){

             Student s=(Student)it.next();

             System.out.println(s);

         }

     }

 }

运行结果显示：

2，带条件查询；

StudentTest.java

 package com.wishwzp.service;

 import java.util.Iterator;

 import java.util.List;

 import org.hibernate.Query;

 import org.hibernate.Session;

 import org.hibernate.SessionFactory;

 import org.junit.After;

 import org.junit.Before;

 import org.junit.Test;

 import com.wishwzp.model.Student;

 import com.wishwzp.util.HibernateUtil;

 public class StudentTest {

     private SessionFactory sessionFactory=HibernateUtil.getSessionFactory();

     private Session session;

     @Before

     public void setUp() throws Exception {

         session=sessionFactory.openSession(); // 生成一个session

         session.beginTransaction(); // 开启事务

     }

     @After

     public void tearDown() throws Exception {

          session.getTransaction().commit(); // 提交事务

          session.close(); // 关闭session

     }

     @Test

     public void testHQLQuery2() {

         String hql="from Student where name like :stuName and age=:stuAge";

         Query query=session.createQuery(hql);

         query.setString("stuName", "张%");

         query.setInteger("stuAge", 10);

         List<Student> studentList=(List<Student>)query.list();

         Iterator it=studentList.iterator();

         while(it.hasNext()){

             Student s=(Student)it.next();

             System.out.println(s);

         }

     }

 }

运行结果显示：

Hibernate: select student0_.stuId as stuId1_0_, student0_.stuName as stuName2_0_, student0_.stuAge as stuAge3_0_ from t_student student0_ where (student0_.stuName like ?) and student0_.stuAge=?
Student [id=1, name=张三, age=10]

3，使用别名；

StudentTest.java

 package com.wishwzp.service;

 import java.util.Iterator;

 import java.util.List;

 import org.hibernate.Query;

 import org.hibernate.Session;

 import org.hibernate.SessionFactory;

 import org.junit.After;

 import org.junit.Before;

 import org.junit.Test;

 import com.wishwzp.model.Student;

 import com.wishwzp.util.HibernateUtil;

 public class StudentTest {

     private SessionFactory sessionFactory=HibernateUtil.getSessionFactory();

     private Session session;

     @Before

     public void setUp() throws Exception {

         session=sessionFactory.openSession(); // 生成一个session

         session.beginTransaction(); // 开启事务

     }

     @After

     public void tearDown() throws Exception {

          session.getTransaction().commit(); // 提交事务

          session.close(); // 关闭session

     }

     @Test

     public void testHQLQuery3() {

         String hql="from Student as s where s.name like :stuName and s.age=:stuAge";

         Query query=session.createQuery(hql);

         query.setString("stuName", "张%");

         query.setInteger("stuAge", 10);

         List<Student> studentList=(List<Student>)query.list();

         Iterator it=studentList.iterator();

         while(it.hasNext()){

             Student s=(Student)it.next();

             System.out.println(s);

         }

     }

 }

运行结果显示：

Hibernate: select student0_.stuId as stuId1_0_, student0_.stuName as stuName2_0_, student0_.stuAge as stuAge3_0_ from t_student student0_ where (student0_.stuName like ?) and student0_.stuAge=?
Student [id=1, name=张三, age=10]

4，对结果排序；

StudentTest.java

 package com.wishwzp.service;

 import java.util.Iterator;

 import java.util.List;

 import org.hibernate.Query;

 import org.hibernate.Session;

 import org.hibernate.SessionFactory;

 import org.junit.After;

 import org.junit.Before;

 import org.junit.Test;

 import com.wishwzp.model.Student;

 import com.wishwzp.util.HibernateUtil;

 public class StudentTest {

     private SessionFactory sessionFactory=HibernateUtil.getSessionFactory();

     private Session session;

     @Before

     public void setUp() throws Exception {

         session=sessionFactory.openSession(); // 生成一个session

         session.beginTransaction(); // 开启事务

     }

     @After

     public void tearDown() throws Exception {

          session.getTransaction().commit(); // 提交事务

          session.close(); // 关闭session

     }

     @Test

     public void testHQLQuery4() {

         String hql="from Student order by age desc";

         Query query=session.createQuery(hql);

         List<Student> studentList=(List<Student>)query.list();

         Iterator it=studentList.iterator();

         while(it.hasNext()){

             Student s=(Student)it.next();

             System.out.println(s);

         }

     }

 }

运行结果显示：

Hibernate: select student0_.stuId as stuId1_0_, student0_.stuName as stuName2_0_, student0_.stuAge as stuAge3_0_ from t_student student0_ order by student0_.stuAge desc
Student [id=2, name=李四, age=15]
Student [id=3, name=王五, age=13]
Student [id=1, name=张三, age=10]

5，分页查询；

StudentTest.java

 package com.wishwzp.service;

 import java.util.Iterator;

 import java.util.List;

 import org.hibernate.Query;

 import org.hibernate.Session;

 import org.hibernate.SessionFactory;

 import org.junit.After;

 import org.junit.Before;

 import org.junit.Test;

 import com.wishwzp.model.Student;

 import com.wishwzp.util.HibernateUtil;

 public class StudentTest {

     private SessionFactory sessionFactory=HibernateUtil.getSessionFactory();

     private Session session;

     @Before

     public void setUp() throws Exception {

         session=sessionFactory.openSession(); // 生成一个session

         session.beginTransaction(); // 开启事务

     }

     @After

     public void tearDown() throws Exception {

          session.getTransaction().commit(); // 提交事务

          session.close(); // 关闭session

     }

     @Test

     public void testHQLQuery5() {

         String hql="from Student";

         Query query=session.createQuery(hql);

         query.setFirstResult(1);

         query.setMaxResults(2);

         List<Student> studentList=(List<Student>)query.list();

         Iterator it=studentList.iterator();

         while(it.hasNext()){

             Student s=(Student)it.next();

             System.out.println(s);

         }

     }

 }

运行结果显示：

Hibernate: select student0_.stuId as stuId1_0_, student0_.stuName as stuName2_0_, student0_.stuAge as stuAge3_0_ from t_student student0_ limit ?, ?
Student [id=2, name=李四, age=15]
Student [id=3, name=王五, age=13]

6，查询单个对象；

StudentTest.java

 package com.wishwzp.service;

 import java.util.Iterator;

 import java.util.List;

 import org.hibernate.Query;

 import org.hibernate.Session;

 import org.hibernate.SessionFactory;

 import org.junit.After;

 import org.junit.Before;

 import org.junit.Test;

 import com.wishwzp.model.Student;

 import com.wishwzp.util.HibernateUtil;

 public class StudentTest {

     private SessionFactory sessionFactory=HibernateUtil.getSessionFactory();

     private Session session;

     @Before

     public void setUp() throws Exception {

         session=sessionFactory.openSession(); // 生成一个session

         session.beginTransaction(); // 开启事务

     }

     @After

     public void tearDown() throws Exception {

          session.getTransaction().commit(); // 提交事务

          session.close(); // 关闭session

     }

     @Test

     public void testHQLQuery6() {

         String hql="from Student";

         Query query=session.createQuery(hql);

         query.setFirstResult(1);

         query.setMaxResults(1);

         Student student=(Student)query.uniqueResult();

         System.out.println(student);

     }

 }

运行结果显示：

Hibernate: select student0_.stuId as stuId1_0_, student0_.stuName as stuName2_0_, student0_.stuAge as stuAge3_0_ from t_student student0_ limit ?, ?
Student [id=2, name=李四, age=15]

7，链式写法；

StudentTest.java

 package com.wishwzp.service;

 import java.util.Iterator;

 import java.util.List;

 import org.hibernate.Query;

 import org.hibernate.Session;

 import org.hibernate.SessionFactory;

 import org.junit.After;

 import org.junit.Before;

 import org.junit.Test;

 import com.wishwzp.model.Student;

 import com.wishwzp.util.HibernateUtil;

 public class StudentTest {

     private SessionFactory sessionFactory=HibernateUtil.getSessionFactory();

     private Session session;

     @Before

     public void setUp() throws Exception {

         session=sessionFactory.openSession(); // 生成一个session

         session.beginTransaction(); // 开启事务

     }

     @After

     public void tearDown() throws Exception {

          session.getTransaction().commit(); // 提交事务

          session.close(); // 关闭session

     }

     @Test

     public void testHQLQuery7() {

         String hql="from Student as s where s.name like :stuName and s.age=:stuAge";

         Query query=session.createQuery(hql);

         List<Student> studentList=(List<Student>)query

                 .setString("stuName", "张%")

                 .setInteger("stuAge", 10)

                 .list();

         Iterator it=studentList.iterator();

         while(it.hasNext()){

             Student s=(Student)it.next();

             System.out.println(s);

         }

     }

 }

运行结果显示：

Hibernate: select student0_.stuId as stuId1_0_, student0_.stuName as stuName2_0_, student0_.stuAge as stuAge3_0_ from t_student student0_ where (student0_.stuName like ?) and student0_.stuAge=?
Student [id=1, name=张三, age=10]

第四节：QBC 查询方式

QBC 查询方式(Query By Criteria)是用一套接口来实现的查询方式；

1，普通查询；

2，带条件查询；

3，对结果排序；

4，分页查询；

5，查询单个对象；

6，链式写法；

1，普通查询；

StudentTest.java

 package com.wishwzp.service;

 import java.util.Iterator;

 import java.util.List;

 import org.hibernate.Criteria;

 import org.hibernate.Query;

 import org.hibernate.Session;

 import org.hibernate.SessionFactory;

 import org.hibernate.criterion.Criterion;

 import org.hibernate.criterion.Order;

 import org.hibernate.criterion.Restrictions;

 import org.junit.After;

 import org.junit.Before;

 import org.junit.Test;

 import com.wishwzp.model.Student;

 import com.wishwzp.util.HibernateUtil;

 public class StudentTest {

     private SessionFactory sessionFactory=HibernateUtil.getSessionFactory();

     private Session session;

     @Before

     public void setUp() throws Exception {

         session=sessionFactory.openSession(); // 生成一个session

         session.beginTransaction(); // 开启事务

     }

     @After

     public void tearDown() throws Exception {

          session.getTransaction().commit(); // 提交事务

          session.close(); // 关闭session

     }

     @Test

     public void testQBCQuery1(){

         Criteria criteria=session.createCriteria(Student.class);

         List<Student> studentList=criteria.list();

         Iterator it=studentList.iterator();

         while(it.hasNext()){

             Student s=(Student)it.next();

             System.out.println(s);

         }

     }

 }

运行结果显示：

Hibernate: select this_.stuId as stuId1_0_0_, this_.stuName as stuName2_0_0_, this_.stuAge as stuAge3_0_0_ from t_student this_
Student [id=1, name=张三, age=10]
Student [id=2, name=李四, age=15]
Student [id=3, name=王五, age=13]

2，带条件查询；

StudentTest.java

 package com.wishwzp.service;

 import java.util.Iterator;

 import java.util.List;

 import org.hibernate.Criteria;

 import org.hibernate.Query;

 import org.hibernate.Session;

 import org.hibernate.SessionFactory;

 import org.hibernate.criterion.Criterion;

 import org.hibernate.criterion.Order;

 import org.hibernate.criterion.Restrictions;

 import org.junit.After;

 import org.junit.Before;

 import org.junit.Test;

 import com.wishwzp.model.Student;

 import com.wishwzp.util.HibernateUtil;

 public class StudentTest {

     private SessionFactory sessionFactory=HibernateUtil.getSessionFactory();

     private Session session;

     @Before

     public void setUp() throws Exception {

         session=sessionFactory.openSession(); // 生成一个session

         session.beginTransaction(); // 开启事务

     }

     @After

     public void tearDown() throws Exception {

          session.getTransaction().commit(); // 提交事务

          session.close(); // 关闭session

     }

     @Test

     public void testQBCQuery2(){

         Criteria criteria=session.createCriteria(Student.class);

         Criterion c1=Restrictions.like("name", "张%");

         Criterion c2=Restrictions.eq("age", 10);

         criteria.add(c1);

         criteria.add(c2);

         List<Student> studentList=criteria.list();

         Iterator it=studentList.iterator();

         while(it.hasNext()){

             Student s=(Student)it.next();

             System.out.println(s);

         }

     }

 }

运行结果显示：

Hibernate: select this_.stuId as stuId1_0_0_, this_.stuName as stuName2_0_0_, this_.stuAge as stuAge3_0_0_ from t_student this_ where this_.stuName like ? and this_.stuAge=?
Student [id=1, name=张三, age=10]

3，对结果排序；

StudentTest.java

 package com.wishwzp.service;

 import java.util.Iterator;

 import java.util.List;

 import org.hibernate.Criteria;

 import org.hibernate.Query;

 import org.hibernate.Session;

 import org.hibernate.SessionFactory;

 import org.hibernate.criterion.Criterion;

 import org.hibernate.criterion.Order;

 import org.hibernate.criterion.Restrictions;

 import org.junit.After;

 import org.junit.Before;

 import org.junit.Test;

 import com.wishwzp.model.Student;

 import com.wishwzp.util.HibernateUtil;

 public class StudentTest {

     private SessionFactory sessionFactory=HibernateUtil.getSessionFactory();

     private Session session;

     @Before

     public void setUp() throws Exception {

         session=sessionFactory.openSession(); // 生成一个session

         session.beginTransaction(); // 开启事务

     }

     @After

     public void tearDown() throws Exception {

          session.getTransaction().commit(); // 提交事务

          session.close(); // 关闭session

     }

     @Test

     public void testQBCQuery3(){

         Criteria criteria=session.createCriteria(Student.class);

         criteria.addOrder(Order.desc("age"));

         List<Student> studentList=criteria.list();

         Iterator it=studentList.iterator();

         while(it.hasNext()){

             Student s=(Student)it.next();

             System.out.println(s);

         }

     }

 }

运行结果显示：

Hibernate: select this_.stuId as stuId1_0_0_, this_.stuName as stuName2_0_0_, this_.stuAge as stuAge3_0_0_ from t_student this_ order by this_.stuAge desc
Student [id=2, name=李四, age=15]
Student [id=3, name=王五, age=13]
Student [id=1, name=张三, age=10]

4，分页查询；

StudentTest.java

 package com.wishwzp.service;

 import java.util.Iterator;

 import java.util.List;

 import org.hibernate.Criteria;

 import org.hibernate.Query;

 import org.hibernate.Session;

 import org.hibernate.SessionFactory;

 import org.hibernate.criterion.Criterion;

 import org.hibernate.criterion.Order;

 import org.hibernate.criterion.Restrictions;

 import org.junit.After;

 import org.junit.Before;

 import org.junit.Test;

 import com.wishwzp.model.Student;

 import com.wishwzp.util.HibernateUtil;

 public class StudentTest {

     private SessionFactory sessionFactory=HibernateUtil.getSessionFactory();

     private Session session;

     @Before

     public void setUp() throws Exception {

         session=sessionFactory.openSession(); // 生成一个session

         session.beginTransaction(); // 开启事务

     }

     @After

     public void tearDown() throws Exception {

          session.getTransaction().commit(); // 提交事务

          session.close(); // 关闭session

     }

     @Test

     public void testQBCQuery4(){

         Criteria criteria=session.createCriteria(Student.class);

         criteria.setFirstResult(2);

         criteria.setMaxResults(2);

         List<Student> studentList=criteria.list();

         Iterator it=studentList.iterator();

         while(it.hasNext()){

             Student s=(Student)it.next();

             System.out.println(s);

         }

     }

 }

运行结果显示：

Hibernate: select this_.stuId as stuId1_0_0_, this_.stuName as stuName2_0_0_, this_.stuAge as stuAge3_0_0_ from t_student this_ limit ?, ?
Student [id=3, name=王五, age=13]

5，查询单个对象；

StudentTest.java

 package com.wishwzp.service;

 import java.util.Iterator;

 import java.util.List;

 import org.hibernate.Criteria;

 import org.hibernate.Query;

 import org.hibernate.Session;

 import org.hibernate.SessionFactory;

 import org.hibernate.criterion.Criterion;

 import org.hibernate.criterion.Order;

 import org.hibernate.criterion.Restrictions;

 import org.junit.After;

 import org.junit.Before;

 import org.junit.Test;

 import com.wishwzp.model.Student;

 import com.wishwzp.util.HibernateUtil;

 public class StudentTest {

     private SessionFactory sessionFactory=HibernateUtil.getSessionFactory();

     private Session session;

     @Before

     public void setUp() throws Exception {

         session=sessionFactory.openSession(); // 生成一个session

         session.beginTransaction(); // 开启事务

     }

     @After

     public void tearDown() throws Exception {

          session.getTransaction().commit(); // 提交事务

          session.close(); // 关闭session

     }

     @Test

     public void testQBCQuery5(){

         Criteria criteria=session.createCriteria(Student.class);

         criteria.setFirstResult(2);

         criteria.setMaxResults(1);

         Student student=(Student)criteria.uniqueResult();

         System.out.println(student);

     }

 }

运行结果显示：

Hibernate: select this_.stuId as stuId1_0_0_, this_.stuName as stuName2_0_0_, this_.stuAge as stuAge3_0_0_ from t_student this_ limit ?, ?
Student [id=3, name=王五, age=13]

6，链式写法；

StudentTest.java

 package com.wishwzp.service;

 import java.util.Iterator;

 import java.util.List;

 import org.hibernate.Criteria;

 import org.hibernate.Query;

 import org.hibernate.Session;

 import org.hibernate.SessionFactory;

 import org.hibernate.criterion.Criterion;

 import org.hibernate.criterion.Order;

 import org.hibernate.criterion.Restrictions;

 import org.junit.After;

 import org.junit.Before;

 import org.junit.Test;

 import com.wishwzp.model.Student;

 import com.wishwzp.util.HibernateUtil;

 public class StudentTest {

     private SessionFactory sessionFactory=HibernateUtil.getSessionFactory();

     private Session session;

     @Before

     public void setUp() throws Exception {

         session=sessionFactory.openSession(); // 生成一个session

         session.beginTransaction(); // 开启事务

     }

     @After

     public void tearDown() throws Exception {

          session.getTransaction().commit(); // 提交事务

          session.close(); // 关闭session

     }

     @Test

     public void testQBCQuery6(){

         Criteria criteria=session.createCriteria(Student.class);

         List<Student> studentList=criteria

                 .setFirstResult(0)

                 .setMaxResults(2)

                 .list();

         Iterator it=studentList.iterator();

         while(it.hasNext()){

             Student s=(Student)it.next();

             System.out.println(s);

         }

     }

 }

运行结果显示：

Hibernate: select this_.stuId as stuId1_0_0_, this_.stuName as stuName2_0_0_, this_.stuAge as stuAge3_0_0_ from t_student this_ limit ?
Student [id=1, name=张三, age=10]
Student [id=2, name=李四, age=15]

END

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