首先，创建类对象
1 package com.imooc.hibernate;View Code
2
3 public class Address {
4
5 private String postcode; //邮编
6 private String phone; //电话
7 private String address; //地址
8
9 public Address() {};
10
11 public String getPostcode() {
12 return postcode;
13 }
14 public void setPostcode(String postcode) {
15 this.postcode = postcode;
16 }
17 public String getPhone() {
18 return phone;
19 }
20 public void setPhone(String phone) {
21 this.phone = phone;
22 }
23 public String getAddress() {
24 return address;
25 }
26 public void setAddress(String address) {
27 this.address = address;
28 }
29 public Address(String postcode, String phone, String address) {
30 // super();
31 this.postcode = postcode;
32 this.phone = phone;
33 this.address = address;
34 }
35 @Override
36 public String toString() {
37 return "Address [postcode=" + postcode + ", phone=" + phone + ", address=" + address + "]";
38 }
39
40 }
1 package com.imooc.hibernate;View Code
2
3 import java.sql.Blob;
4 import java.util.Date;
5
6 public class Students {
7
8 private int sid;
9 private String sname;
10 private String gender;
11 private Date birthday;
12 private Address address;
13 private Blob picture;
14
15 public Blob getPicture() {
16 return picture;
17 }
18
19 public void setPicture(Blob picture) {
20 this.picture = picture;
21 }
22
23 public Students() {}
24
25 public Students(int sid, String sname, String gender, Date birthday, Address address, Blob picture) {
26 super();
27 this.sid = sid;
28 this.sname = sname;
29 this.gender = gender;
30 this.birthday = birthday;
31 this.address = address;
32 this.picture = picture;
33 }
34
35 @Override
36 public String toString() {
37 return "Students [sid=" + sid + ", sname=" + sname + ", gender=" + gender + ", birthday=" + birthday
38 + ", address=" + address + ", picture=" + picture + "]";
39 }
40
41 public Address getAddress() {
42 return address;
43 }
44
45 public void setAddress(Address address) {
46 this.address = address;
47 }
48
49 public int getSid() {
50 return sid;
51 }
52
53 public void setSid(int sid) {
54 this.sid = sid;
55 }
56
57 public String getSname() {
58 return sname;
59 }
60
61 public void setSname(String sname) {
62 this.sname = sname;
63 }
64
65 public String getGender() {
66 return gender;
67 }
68
69 public void setGender(String gender) {
70 this.gender = gender;
71 }
72
73 public Date getBirthday() {
74 return birthday;
75 }
76
77 public void setBirthday(Date birthday) {
78 this.birthday = birthday;
79 }
80
81 }
创建类对象的配置文件
1 <?xml version="1.0"?>View Code
2 <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
3 "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
4 <!-- Generated 2017-5-23 0:24:09 by Hibernate Tools 3.5.0.Final -->
5 <hibernate-mapping>
6 <class name="com.imooc.hibernate.Students" table="STUDENTS">
7 <id name="sid" type="int">
8 <column name="SID" />
9 <generator class="native" />
10 </id>
11 <property name="sname" type="java.lang.String">
12 <column name="SNAME" />
13 </property>
14 <property name="gender" type="java.lang.String">
15 <column name="GENDER" />
16 </property>
17 <property name="birthday" type="java.util.Date">
18 <column name="BIRTHDAY" />
19 </property>
20 <property name="picture" type="java.sql.Blob">
21 <column name="PICTURE" />
22 </property>
23
24 <component name="address" class="com.imooc.hibernate.Address">
25 <property name="postcode" column="POSTCODE"/>
26 <property name="phone" column="PHONE"/>
27 <property name="address" column="ADDRESS"/>
28 </component>
29 </class>
30 </hibernate-mapping>
创建hibernate配置文件
1 <?xml version="1.0" encoding="UTF-8"?>View Code
2 <!DOCTYPE hibernate-configuration PUBLIC
3 "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
4 "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
5 <hibernate-configuration>
6 <session-factory>
7 <property name="connection.username">root</property>
8 <property name="connection.password">root</property>
9 <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
10 <property name="connection.url">jdbc:mysql://localhost:3306/hibernate?useUnicode=true&characterEncoding=UTF-8</property>
11 <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
12 <property name="show_sql">true</property>
13 <property name="format_sql">true</property>
14 <property name="hbm2ddl.auto">update</property>
15
16 <mapping resource="com/imooc/hibernate/Students.hbm.xml"/>
17 </session-factory>
18 </hibernate-configuration>
创建测试类
1 package com.icoom.test;View Code
2 import java.io.File;
3 import java.io.FileInputStream;
4 import java.io.FileOutputStream;
5 import java.io.InputStream;
6 import java.io.OutputStream;
7 import java.sql.Blob;
8 import java.util.Date;
9
10 import org.hibernate.Hibernate;
11 import org.hibernate.Session;
12 import org.hibernate.SessionFactory;
13 import org.hibernate.Transaction;
14 import org.hibernate.cfg.Configuration;
15 import org.hibernate.service.ServiceRegistry;
16 import org.hibernate.service.ServiceRegistryBuilder;
17 import org.junit.After;
18 import org.junit.Before;
19 import org.junit.Test;
20
21 import com.imooc.hibernate.Address;
22 import com.imooc.hibernate.Students;
23
24 public class StudentsTest {
25
26 private SessionFactory sessionFactory;
27 private Session session;
28 private Transaction transaction;
29
30 @Before
31 public void init() {
32 // 1.创建配置对象
33 Configuration config = new Configuration().configure();
34 // 2.创建服务注册对象
35 ServiceRegistry serviceRegistry = new ServiceRegistryBuilder().applySettings(config.getProperties()).buildServiceRegistry();
36 // 3.创建会话工厂对象
37 sessionFactory = config.buildSessionFactory(serviceRegistry);
38 // 会话对象
39 session = sessionFactory.openSession();
40 // 开启事务
41 transaction = session.beginTransaction();
42 }
43
44 @After
45 public void destory() {
46 transaction.commit(); //提交事务
47 session.close(); //关闭session
48 sessionFactory.close();//关闭会话工厂
49 }
50
51 @Test
52 public void testSaveStudents() {
53 Students s = new Students();
54 s.setSid(1);
55 s.setSname("老张");
56 s.setGender("男");
57 s.setBirthday(new Date());
58 Address address = new Address("250000", "1310531xxxx", "山东济南");
59 s.setAddress(address);
60 session.save(s);//保存对象进入数据库
61 }
62
63 @Test
64 public void testGetStudents() {
65 Students s = (Students) session.get(Students.class, 1);
66 System.out.println(s);
67 }
68
69 @Test
70 public void testLoadStudents() {
71 Students s = (Students) session.load(Students.class, 1);
72 System.out.println(s);
73 }
74
75 @Test
76 public void testUpdateStudents() {
77 Students s = (Students) session.get(Students.class, 1);
78 s.setGender("女");
79 session.update(s);
80 }
81
82 @Test
83 public void testDeleteStudents() {
84 Students s = (Students) session.get(Students.class, 1);
85 session.delete(s);
86 }
87 }
get和load方法的区别
- 在不考虑缓存的情况下，get方法会在调用之后立即向数据库发出sql语句，返回持久化对象；load方法会在调用后放回一个代理对象。该代理对象只保存了实体对象的id，知道使用对象的非主键属性时才会发出sql语句。
- 查询数据库中不存在的数据时，get方法返回null，load方法抛出org.hibernate.ObjectNotFoundException异常。