hibernate3学习笔记(十一)｜复合主键[Java编程]

新建数据库User:

1.CREATE TABLE user (
2.    name VARCHAR(100) NOT NULL,
3.    phone VARCHAR(50) NOT NULL,
4.    age INT,
5.    PRIMARY KEY(name, phone)
6.);

现将name和phone定义成复合主键.辨别利用2种办法以下:

办法1.复合主键字段直接包含在PO类中.

User.java（需求实现Serializable接口,并定义equals()和hashCode()办法）

1.package com.hb3.pack_03.model;
2.
3.import java.io.Serializable;
4.import org.apache.commons.lang.builder.EqualsBuilder;
5.import org.apache.commons.lang.builder.HashCodeBuilder;
6.
7.public class User implements Serializable {
8.
9.    private static final long serialVersionUID = -8377583111386512407L;
10.
11.    private String name;
12.    private String phone;
13.    private Integer age;
14.
15.    public User() {
16.    }
17.
18.    public Integer getAge() {
19.        return age;
20.    }
21.
22.    public void setAge(Integer age) {
23.        this.age = age;
24.    }
25.
26.    public String getName() {
27.        return name;
28.    }
29.
30.    public void setName(String name) {
31.        this.name = name;
32.    }
33.
34.    public String getPhone() {
35.        return phone;
36.    }
37.
38.    public void setPhone(String phone) {
39.        this.phone = phone;
40.    }
41.
42.    public boolean equals(Object obj) {
43.        if(obj == this) {
44.            return true;
45.        }
46.
47.        if(!(obj instanceof User)) {
48.            return false;
49.        }
50.
51.        User user = (User) obj;
52.        return new EqualsBuilder()
53.                 .append(this.name, user.getName())
54.                 .append(this.phone, user.getPhone())
55.                 .isEquals();
56.    }
57.
58.    public int hashCode() {
59.        return new HashCodeBuilder()
60.                 .append(this.name)
61.                 .append(this.phone)
62.                 .toHashCode();
63.    }
64.}

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