Person.java
1 package cn.itcast.hiberate.sh.domain.onetoone;
2
3 import java.io.Serializable;
4 import java.util.Set;
5
6 public class Person implements Serializable{
7 private Long cid;
8 private String cname;
9 private String description;
10
11 public Long getCid() {
12 return cid;
13 }
14
15 public void setCid(Long cid) {
16 this.cid = cid;
17 }
18
19 public String getCname() {
20 return cname;
21 }
22
23 public void setCname(String cname) {
24 this.cname = cname;
25 }
26
27 public String getDescription() {
28 return description;
29 }
30
31 public void setDescription(String description) {
32 this.description = description;
33 }
34
35 public Address getAddress() {
36 return address;
37 }
38
39 public void setAddress(Address address) {
40 this.address = address;
41 }
42
43 private Address address;
44 }
Person.hbm.xml
1 <?xml version="1.0" encoding="utf-8"?>
2 <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
3 "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
4 <hibernate-mapping>
5 <class name="cn.itcast.hiberate.sh.domain.Classes">
6 <id name="cid" length="5" type="java.lang.Long">
7 <generator class="increment"></generator>
8 </id>
9 <property name="cname" length="20" type="java.lang.String"></property>
10
11 <property name="description" length="100" type="java.lang.String"></property>
12 <!--
13 set元素对应类中的set集合
14 通过set元素使classes表与student表建立关联
15 key是通过外键的形式让两张表建立关联
16 one-to-many是通过类的形式让两个类建立关联
17
18 cascade 级联
19 save-update
20 1、当 保存班级的时候，对学生进行怎么样的操作
21 如果学生对象在数据库中没有对应的值，这个时候会执行save操作
22 如果学生对象在数据库中有对应的值，这个时候会执行update操作
23 delete
24 all
25 inverse 维护关系
26 true 不维护关系
27 false 维护关系
28 default false
29 -->
30 <set name="students" cascade="save-update" inverse="true">
31 <!--
32 key是用来描述外键
33 -->
34 <key>
35 <column name="cid"></column>
36 </key>
37 <one-to-many class="cn.itcast.hiberate.sh.domain.Student"/>
38 </set>
39 </class>
40 </hibernate-mapping>
Address.java
1 package cn.itcast.hiberate.sh.domain.onetoone;
2
3 import java.io.Serializable;
4
5 public class Address implements Serializable{
6 private Long sid;
7 private String sname;
8
9 private Person person;
10
11
12 public Person getPerson() {
13 return person;
14 }
15 public void setPerson(Person person) {
16 this.person = person;
17 }
18 public Long getSid() {
19 return sid;
20 }
21 public void setSid(Long sid) {
22 this.sid = sid;
23 }
24 public String getSname() {
25 return sname;
26 }
27 public void setSname(String sname) {
28 this.sname = sname;
29 }
30 public String getDescription() {
31 return description;
32 }
33 public void setDescription(String description) {
34 this.description = description;
35 }
36 private String description;
37 }
Address.hbm.xml 外键唯一
1 <?xml version="1.0" encoding="utf-8"?>
2 <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
3 "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
4 <hibernate-mapping>
5 <class name="cn.itcast.hiberate.sh.domain.Student">
6 <id name="sid" length="5">
7 <generator class="increment"></generator>
8 </id>
9 <property name="sname" length="20"></property>
10 <property name="description" length="100"></property>
11 <!--
12 多对一
13 column 外键
14 -->
15 <many-to-one name="classes" class="cn.itcast.hiberate.sh.domain.Classes" column="cid" cascade="save-update" unique="true"></many-to-one>
16 </class>
17 </hibernate-mapping>
hibernate 建表一对一 就是一对多，多的一方外键唯一unique,布布扣,bubuko.com
时间： 2024-08-03 00:03:55