一对一双向外键关联

一对一双向外键关联
　　a) 项目名称：hibernate_0700_one2one_bi_fk
　　b) Annotation:@One2One(mappedBy)
　　c) xml:<many-to-one unique> <one-to-one property-ref>
　　d) 规律：凡是双向关联，必设(最佳实践) mappedBy

注解：

配置 Husband 和 Wife 一对一双向外键关联

Husband:

 1 package com.bjsxt.hibernate;
 2 
 3 import javax.persistence.Entity;
 4 import javax.persistence.GeneratedValue;
 5 import javax.persistence.Id;
 6 import javax.persistence.JoinColumn;
 7 import javax.persistence.OneToOne;
 8 
 9 @Entity
10 public class Husband {
11     
12     private Integer id;
13     
14     private String name;
15 
16     private Wife wife;
17     
18     @Id
19     @GeneratedValue
20     public Integer getId() {
21         return id;
22     }
23 
24     public String getName() {
25         return name;
26     }
27 
28     @OneToOne//一对一的关系
29     @JoinColumn(name="wifeId")//外键ID
30     public Wife getWife() {
31         return wife;
32     }
33 
34     public void setId(Integer id) {
35         this.id = id;
36     }
37 
38     public void setName(String name) {
39         this.name = name;
40     }
41 
42     public void setWife(Wife wife) {
43         this.wife = wife;
44     }
45 }

Wife

 1 package com.bjsxt.hibernate;
 2 
 3 import javax.persistence.Entity;
 4 import javax.persistence.GeneratedValue;
 5 import javax.persistence.Id;
 6 import javax.persistence.JoinColumn;
 7 import javax.persistence.OneToOne;
 8 
 9 @Entity
10 public class Wife {
11     private Integer id;
12     
13     private String name;
14     
15     private Husband husband;
16 
17     @Id
18     @GeneratedValue
19     public Integer getId() {
20         return id;
21     }
22 
23     public void setId(Integer id) {
24         this.id = id;
25     }
26 
27     public String getName() {
28         return name;
29     }
30 
31     public void setName(String name) {
32         this.name = name;
33     }
34 
35     @OneToOne(mappedBy="wife")//wife 为 husband 的 wife
36     //@JoinColumn(name="husbandId")
37     public Husband getHusband() {
38         return husband;
39     }
40 
41     public void setHusband(Husband husband) {
42         this.husband = husband;
43     }
44 }

XML 配置

Student(学生) 和 StudentIdCard(学生证) 为一对一双向外键关联

Student

 1 package com.bjsxt.hibernate;
 2 
 3 public class Student {
 4     
 5     private Integer id;
 6     
 7     private String name;
 8     
 9     private Integer age;
10     
11     private String sex;
12     
13     private boolean good;
14     
15     private StudentIdCard studentIdCard;
16 
17     public Integer getId() {
18         return id;
19     }
20 
21     public void setId(Integer id) {
22         this.id = id;
23     }
24 
25     public String getName() {
26         return name;
27     }
28 
29     public void setName(String name) {
30         this.name = name;
31     }
32 
33     public Integer getAge() {
34         return age;
35     }
36 
37     public void setAge(Integer age) {
38         this.age = age;
39     }
40 
41     public String getSex() {
42         return sex;
43     }
44 
45     public void setSex(String sex) {
46         this.sex = sex;
47     }
48 
49     public boolean isGood() {
50         return good;
51     }
52 
53     public void setGood(boolean good) {
54         this.good = good;
55     }
56 
57     public StudentIdCard getStudentIdCard() {
58         return studentIdCard;
59     }
60 
61     public void setStudentIdCard(StudentIdCard studentIdCard) {
62         this.studentIdCard = studentIdCard;
63     }
64     
65 }

View Code

StudentIdCard

 1 package com.bjsxt.hibernate;
 2 
 3 public class StudentIdCard {
 4 
 5     private Integer id;
 6     
 7     private String num;
 8     
 9     private Student student;
10 
11     public Integer getId() {
12         return id;
13     }
14 
15     public void setId(Integer id) {
16         this.id = id;
17     }
18 
19     public String getNum() {
20         return num;
21     }
22 
23     public void setNum(String num) {
24         this.num = num;
25     }
26 
27     public Student getStudent() {
28         return student;
29     }
30 
31     public void setStudent(Student student) {
32         this.student = student;
33     }
34     
35 }

View Code

StudentIdCard.hbm.xml

 1 <?xml version="1.0"?>
 2 <!DOCTYPE hibernate-mapping PUBLIC
 3         "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
 4         "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
 5 
 6 <hibernate-mapping package="com.bjsxt.hibernate">
 7     <class name="StudentIdCard" table="studentidcard">
 8         <id name="id" column="id">
 9             <generator class="native"/>
10         </id>
11         <property name="num" column="num"/>
12         <many-to-one name="student" column="studentId" unique="true"></many-to-one>
13     </class>
14 </hibernate-mapping>

Student.hbm.xml

 1 <?xml version="1.0"?>
 2 <!DOCTYPE hibernate-mapping PUBLIC
 3         "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
 4         "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
 5 
 6 <hibernate-mapping package="com.bjsxt.hibernate">
 7     <class name="Student" table="student" dynamic-update="true">
 8         <id name="id" column="id">
 9             <generator class="native"/>
10         </id>
11         <property name="name" column="name"/>
12         <property name="age" column="age"/>
13         <property name="sex" column="sex"/>
14         <property name="good" type="yes_no"/>
15         <!-- 表示以StudentIdCard 为主导，自己不再产生额外的外键 -->
16         <one-to-one name="studentIdCard" property-ref="student"></one-to-one>
17     </class>
18 </hibernate-mapping>

jar 包链接: https://pan.baidu.com/s/1nvqK2F3 密码: 529r

代码链接: https://pan.baidu.com/s/1dEXxUt7 密码: sxbb