Hibernate以组件作为复合主键实例详解

<hibernate-configuration>
<session-factory>
    <!-- 配置数据库方言 -->
    <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
    <!-- 配置数据库的驱动 -->
    <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
    <!-- 配置数据库用户名 -->
    <property name="hibernate.connection.username">root</property>
    <!-- 配置数据库的密码 -->
    <property name="hibernate.connection.password">root</property>
    <!-- 配置数据库的url -->
    <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hibernate</property>
    <!-- 配置数据池的最大容量 -->
    <property name="hibernate.c3p0.max_size">20</property>
    <!-- 配置数据池的最小容量 -->
    <property name="hibernate.c3p0.min_size">1</property>
    <!-- 配置数据链接的超时界限 -->
    <property name="hibernate.c3p0.timeout">5000</property>
    <!-- 在控制台显示后台是否打印执行的sql -->
    <property name="hibernate.show_sql">true</property>
    <!-- 是否以友好的格式显示打印的sql -->
    <property name="hibernate.format_sql">true</property>
    <!-- 打印一些辅助性的注释 -->
    <property name="hibernate.use_sql_comments">true</property>

    <property name="hibernate.c3p0.max_statements">100</property>
    <property name="hibernate.c3p0.idle_test_period">3000</property>
    <property name="hibernate.c3p0.acquire_increment">2</property>
    <property name="hibernate.c3p0.validate">true</property>
    <!-- 配置数据操作的方式 -->
    <property name="hbm2ddl.auto">create</property>
    <!-- 将我们上面 Member 的映射文件添加进来 -->
    <mapping resource="org/Rudiment/hibernate/Member.hbm.xml" />
</session-factory>
</hibernate-configuration>

import java.util.HashMap;
import java.util.Map;

public class Member {
    private Integer id;
    private Name name;
    private Integer age;
 
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public Name getName() {
        return name;
    }
    public void setName(Name name) {
        this.name = name;
    }
    public Integer getAge() {
        return age;
    }
    public void setAge(Integer age) {
        this.age = age;
    }
}

import java.io.Serializable;

public class Name implements Serializable
{
    private String first;
    private String last;
   
    public Name()
    {}
   
    public Name(String first, String last)
    {
        this.first = first;
        this.last = last;
    }
   
    public String getFirst() {
        return first;
    }
    public void setFirst(String first) {
        this.first = first;
    }
    public String getLast() {
        return last;
    }
    public void setLast(String last) {
        this.last = last;
    }
   
    @Override
    public boolean equals(Object obj)
    {
        if(this == obj)
        {
            return true;
        }
        else if(obj != null && obj.getClass() == Name.class)
        {
            Name target = (Name)obj;
            if(target.getFirst().equals(this.getFirst()) && target.getLast().equals(this.getLast()))
            {
                return true;
            }
        }
        return false;
    }
   
    @Override
    public int hashCode()
    {
        return this.getFirst().hashCode() * 7 + this.getLast().hashCode();
    }
}

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.ServiceRegistryBuilder;

public class MemberHandler {

     public static void insert() {
             Configuration conf = new Configuration();
             conf.configure();
             ServiceRegistry sr = new ServiceRegistryBuilder().applySettings(conf.getProperties()).buildServiceRegistry();
             SessionFactory sf = conf.buildSessionFactory(sr);
             Session session = sf.openSession();
            session.beginTransaction();
            Member m = new Member();
            m.setAge(24);
           
            Name n = new Name("IT","kezhan");
            m.setName(n);
           
            session.save(m);
            session.getTransaction().commit();
            session.close();
        }
   
    public static void main(String[] args) {
            insert();
    }
}

mysql> desc test_member;
+-------+--------------+------+-----+---------+-------+
| Field | Type         | Null | Key | Default | Extra |
+-------+--------------+------+-----+---------+-------+
| first | varchar(255) | NO   | PRI | NULL    |       |
| last  | varchar(255) | NO   | PRI | NULL    |       |
| AGE   | int(11)      | YES  |     | NULL    |       |
+-------+--------------+------+-----+---------+-------+
3 rows in set (0.01 sec)