Hibernate（5.3.7） 增删改查

Hibernate（5.3.7） 增删改查

1. 项目结构

   

2. 创建实体类

   Student.java

   public class Student implements Serializable {
       private int id;
       private String name;
       private int age;
   	...//getter setter
   }
   

3. 创建映射

   Student.hbm.xml

   <?xml version='1.0' encoding='utf-8'?>
   <!DOCTYPE hibernate-mapping PUBLIC
           "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
           "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
   <hibernate-mapping>
       <class name="learn.hibernate.entity.Student" table="stu_tab" >
           <id name="id" column="stu_id">
               <generator class="native"/>
           </id>
           <property name="name" column="stu_name"/>
           <property name="age" column="stu_age"/>
       </class>
   </hibernate-mapping>
   

4. 配置

   hibernate.cfg.xml

   <hibernate-configuration>
       <session-factory>
           
           <!--配置数据库连接-->
           <property name="connection.url">jdbc:mysql://localhost:3306/test</property>
           <property name="connection.driver_class">com.mysql.cj.jdbc.Driver</property>
           <property name="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</property>
   
           <property name="connection.username">root</property>
           <property name="connection.password">123</property>
         
           <!--显示sql语句-->
           <property name="show_sql">true</property>
           <property name="format_sql">true</property>
         
           <!--设置映射-->   
           <mapping resource="learn/hibernate/entity/Student.hbm.xml"/>
           <!-- DB schema will be updated if needed -->
           <!-- <property name="hbm2ddl.auto">update</property> -->
       </session-factory>
   </hibernate-configuration>
   

5. 测试类

   • 增

     @Test
     public void add() {
         Configuration cfg = new Configuration();
         cfg.configure("hibernate.cfg.xml");
      
         SessionFactory factory = cfg.buildSessionFactory()；
         Session session = factory.openSession();
         Transaction t = session.beginTransaction();
     
         Student student = new Student();
         student.setName("a");
         student.setAge(1);
     
         try{
             session.save(student);
             t.commit();
         }catch (Exception e){
             e.printStackTrace();
             t.rollback();
         }finally {
             session.close();
         }
     }
     

     Hibernate: 
         insert 
         into
             stu_tab
             (stu_name, stu_age) 
         values
             (?, ?)
     

   • 单条记录查

     @Test
     public void query() {
         Configuration cfg = new Configuration().configure();
         SessionFactory factory = cfg.buildSessionFactory();
         Session session = factory.openSession();
         Transaction t = session.beginTransaction();
         Student student = session.get(Student.class, 1);
         t.commit();
         session.close();
         System.out.println("successfully query: name[" + student.getName() + "]。");
     }
     

     Hibernate: 
         select
             student0_.stu_id as stu_id1_0_0_,
             student0_.stu_name as stu_name2_0_0_,
             student0_.stu_age as stu_age3_0_0_ 
         from
             stu_tab student0_ 
         where
             student0_.stu_id=?
     successfully query: name[a]。
     

   • 列表查

     @Test
     public void queryList() {
         Configuration cfg = new Configuration().configure();
         SessionFactory factory = cfg.buildSessionFactory();
         Session session = factory.openSession();
         Transaction t = session.beginTransaction();
         @SuppressWarnings("unchecked")
         List<Student> students = session.createQuery("from Student").getResultList();
         int i = 0;
         for (Student student :students ) {
             System.out.println("queryUserList[" + i + "] name :[" + student.getName() + "]");
             i++;
         }
         t.commit();
         session.close();
     }
     

     Hibernate: 
         select
             student0_.stu_id as stu_id1_0_0_,
             student0_.stu_name as stu_name2_0_0_,
             student0_.stu_age as stu_age3_0_0_ 
         from
             stu_tab student0_ 
         where
             student0_.stu_id=?
             
     successfully query: name[a]
     

   • 删除

     @Test
     public void delete() {
         Configuration cfg = new Configuration().configure();
         SessionFactory factory = cfg.buildSessionFactory();
         Session session = factory.openSession();
         Transaction t = session.beginTransaction();
         Student student = new Student();
         student.setId(2);
         session.delete(student);
         t.commit();
         session.close();
     
     }
     

     Hibernate: 
         delete 
         from
             stu_tab 
         where
             stu_id=?
     

   • 更新

     @Test
     public void update() {
         Configuration cfg = new Configuration().configure();
         SessionFactory factory = cfg.buildSessionFactory();
         Session session = factory.openSession();
         Transaction t = session.beginTransaction();
     
         Student student = new Student();
         student.setId(3);
         student.setName("s");
         student.setAge(19);
     
         session.update(student);
         t.commit();
         session.close();
     
     }
     

     Hibernate: 
         update
             stu_tab 
         set
             stu_name=?,
             stu_age=? 
         where
             stu_id=?
     

     ​