标签：style blog class code java color
1、One To One 单相
背景：
古代一个老婆 只能关联一个老公
husband.java
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package
com.rhythmk.model;public class husband { public
Integer getHusbandId() { return
husbandId; } public
void setHusbandId(Integer husbandId) { this.husbandId = husbandId; } public
String getName() { return
Name; } public
void setName(String name) { Name = name; } private
Integer husbandId; private
String Name;} |
hasband.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 package="com.rhythmk.model"> <class name="husband" table="t_husband"> <id name="husbandId" type="int"> <column name="husbandId" /> <generator class="native" /> </id> <property name="Name" type="string"> </property> </class> </hibernate-mapping>
wife.java
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package
com.rhythmk.model;public class wife { private
Integer wifeId; private
String name; public
Integer getWifeId() { return
wifeId; } public
void setWifeId(Integer wifeId) { this.wifeId = wifeId; } public
String getName() { return
name; } public
void setName(String name) { this.name = name; } public
husband getHb() { return
hb; } public
void setHb(husband hb) { this.hb = hb; } private
husband hb; @Override public
String toString() { return
"wife [wifeId=" + wifeId + ", name="
+ name + ", hb="
+ hb + "]"; } } |
wife.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 package="com.rhythmk.model"> <class name="wife" table="t_wife"> <id name="wifeId" type="int"> <column name="wifeId" /> <generator class="native" /> </id> <property name="Name" type="string"> </property> <!-- one to one 类似于 one to many 只需要添加 unique =true 即可 --> <many-to-one name="hb" column="husbandId" ></many-to-one> </class> </hibernate-mapping>
注意：
one to one 类似于 one to many 只需要添加 unique =true 即可
2、One To One 双向
跟单相查不多 就是两边都配上 many to one
调整 hasband.hbm.xml 添加：
<!-- one to one 类似于 one to many 只需要添加 unique =true 即可 --> <many-to-one name="mywife" column="wifeId" ></many-to-one>
调整 husband.java ：
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public wife getMywife() { return
mywife;}public void setMywife(wife mywife) { this.mywife = mywife;}private
wife mywife; |
测试：
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@Testpublic void test02_add() { Session session = null; try
{ session = HibernateUtil.getSessionFactory().openSession(); session.beginTransaction(); husband hb = new
husband(); hb.setName("王大1"); wife w = new
wife(); w.setName("张妞 2"); w.setHb(hb); hb.setMywife(w); session.save(hb); session.save(w); System.out.println(w.toString()); session.getTransaction().commit(); } catch
(Exception e) { e.printStackTrace(); } finally
{ if
(session != null) session.close(); }} |
输出：
Hibernate: insert into t_husband (Name, wifeId) values (?, ?)
Hibernate:
insert into t_wife (Name, husbandId) values (?, ?)
wife [wifeId=6, name=张妞 2,
hb=com.rhythmk.model.husband@8b677f]
Hibernate: update t_husband set Name=?,
wifeId=? where husbandId=?
Rhythmk 学习 Hibernate 05 - Hibernate 表间关系 [One To One],布布扣,bubuko.com
Rhythmk 学习 Hibernate 05 - Hibernate 表间关系 [One To One]
标签：style blog class code java color
原文地址：http://www.cnblogs.com/rhythmK/p/3704710.html
