【Hibernate】---Query、Criteria、SQLQuery

一、核心配置文件

 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE hibernate-configuration PUBLIC
         "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
         "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
 <hibernate-configuration>
     <session-factory>
         <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
         <property name="hibernate.connection.password">root</property>
         <property name="hibernate.connection.url">jdbc:mysql:///test</property>
         <property name="hibernate.connection.username">root</property>

         <property name="hibernate.show_sql">true</property>
         <property name="hibernate.format_sql">true</property>
         <property name="hibernate.hbm2ddl.auto">update</property>
         <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>

         <property name="current_session_context_class">thread</property>

         <mapping resource="com/chinasofti/entity/EUser.hbm.xml"/>

     </session-factory>
 </hibernate-configuration>

二、实体类

 package com.chinasofti.entity;

 public class EUser {
     private int id;
     private String username;
     private String password;

     public int getId() {
         return id;
     }
     public void setId(int id) {
         this.id = id;
     }
     public String getUsername() {
         return username;
     }
     public void setUsername(String username) {
         this.username = username;
     }
     public String getPassword() {
         return password;
     }
     public void setPassword(String password) {
         this.password = password;
     }
     @Override
     public String toString() {
         return "EUser [id=" + id + ", username=" + username + ", password="
                 + password + "]";
     }

 }

三、映射文件

 <?xml version="1.0"?>
 <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
 "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
 <!-- Generated 2017-8-10 10:27:23 by Hibernate Tools 3.4.0.CR1 -->
 <hibernate-mapping>
     <class name="com.chinasofti.entity.EUser" table="EUSER">
         <id name="id" type="int">
             <column name="ID" />
             <generator class="native" />
         </id>
         <property name="username" type="java.lang.String">
             <column name="USERNAME" />
         </property>
         <property name="password" type="java.lang.String">
             <column name="PASSWORD" />
         </property>
     </class>
 </hibernate-mapping>

四、封装类

 package com.chinasofti.entity;
 import org.hibernate.Session;
 import org.hibernate.SessionFactory;
 import org.hibernate.cfg.Configuration;

 public class HibernateUtil {
     static Configuration CONFIGURATION = null;
     static SessionFactory SESSION_FACTORY = null;
     static Session SESSION = null;
     static{
         CONFIGURATION = new Configuration();
         CONFIGURATION.configure();
         SESSION_FACTORY = CONFIGURATION.buildSessionFactory();
         SESSION    = SESSION_FACTORY.openSession();
     }
     public static SessionFactory getSessionFactory(){
         return SESSION_FACTORY;
     }
     public static Session openSession(){
         return SESSION;
     }
 }

五、测试类

 package com.chinasofti.test;

 import java.util.List;

 import org.hibernate.Criteria;
 import org.hibernate.Query;
 import org.hibernate.SQLQuery;
 import org.hibernate.Session;
 import org.hibernate.Transaction;
 import org.junit.Test;

 import com.chinasofti.entity.EUser;
 import com.chinasofti.entity.HibernateUtil;

 public class TestHibernateTestQuery {

     @Test
     public void TestQuery(){
         Session session = HibernateUtil.openSession();
         Query query = session.createQuery("from EUser");
         List<EUser> list = query.list();
         for (EUser eUser : list) {
             System.out.println(eUser.getUsername());
         }
     }

     @Test
     public void TestCriteriaQuery(){
         Session session = HibernateUtil.openSession();
         Criteria criteria = session.createCriteria(EUser.class);
         List<EUser> list = criteria.list();
         for (EUser eUser : list) {
             System.out.println(eUser.getUsername());
         }
     }
     @Test
     public void TestSqlQuery(){
         Session session = HibernateUtil.openSession();
         //创建SQLQuery对象
         SQLQuery sQLQuery = session.createSQLQuery("select * from euser");
         //添加一个实体类
         sQLQuery.addEntity(EUser.class);
         List<EUser> list = sQLQuery.list();
         for (EUser eUsers : list) {
             System.out.println(eUsers.getUsername());
         }
     }

     @Test
     public void testRollback(){
         Session session=null;
         //注意：先查询再修改
         Transaction transaction=null;
         try {
             session = HibernateUtil.openSession();
             transaction = session.beginTransaction();
             EUser user = session.get(EUser.class, 4);
             //给user对象设置新的值
             user.setUsername("滚回来");
             session.save(user);
             System.out.println(10/0);
             transaction.commit();
             //注意：mysql和oracle数据不一样，如果这里操作的是oracle，这里数据就不会变。因为mysql是自动提交的（默认）
         } catch (Exception e) {
             // TODO Auto-generated catch block
             transaction.rollback();
         }finally{
             session.close();
         }
     }

 }

之前Hibernate API的使用（Query、Criteria、SQLQuery对象） 没有附代码    今天补上