Hibernate Gossip: 複合主鍵（二）

• UserPK.java

package onlyfun.caterpillar;

import java.io.Serializable;

import org.apache.commons.lang.builder.EqualsBuilder;
import org.apache.commons.lang.builder.HashCodeBuilder;

public class UserPK implements Serializable {
    private String name;
    private String phone;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }
 
    public boolean equals(Object obj) {
        if(obj == this) {
            return true;
        }
 
        if(!(obj instanceof User)) {
            return false;
        }
 
        UserPK pk = (UserPK) obj;
        return new EqualsBuilder()
                    .append(this.name, pk.getName())
                    .append(this.phone, pk.getPhone())
                    .isEquals();
    }
 
    public int hashCode() {
        return new HashCodeBuilder()
                    .append(this.name)
                    .append(this.phone)
                    .toHashCode();
    }
}

• User.java

package onlyfun.caterpillar;

import java.io.Serializable;

public class User implements Serializable {
    private UserPK userPK; // 主鍵
    private Integer age;
 
    public User() {}

    public UserPK getUserPK() {
        return userPK;
    }

    public void setUserPK(UserPK userPK) {
        this.userPK = userPK;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }
}

• User.hbm.xml

<?xml version="1.0" encoding="utf-8"?> 
<!DOCTYPE hibernate-mapping 
 PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" 
 "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> 

<hibernate-mapping> 

    <class name="onlyfun.caterpillar.User" table="user"> 
        <composite-id name="userPK"
                      class="onlyfun.caterpillar.UserPK"
                      unsaved-value="any">
            <key-property name="name" 
                          column="name"/>
            <key-property name="phone" 
                          column="phone"/>
        </composite-id>
 
        <property name="age" column="age"/>
 
    </class> 

</hibernate-mapping>