Hibernate（八）：基于外键映射的1-1关联关系

背景：

一个部门只有一个一把手，这在程序开发中就会设计数据映射应该设置为一对一关联。

在hibernate代码开发中，实现这个业务有两种方案：

1）基于外键映射的1-1关联；

2）基于主键映射的1-1关联。

本篇文章主要是用来学习如何使用外键实现1-1关联关系。

新建项目hibernate05

新建java project,引入依赖包，在src下添加hibernate.cfg.xml

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!DOCTYPE hibernate-configuration PUBLIC
 3         "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
 4         "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
 5 <hibernate-configuration>
 6     <session-factory>
 7         <property name="hibernate.connection.username">root</property>
 8         <property name="hibernate.connection.password">123456</property>
 9         <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
10         <property name="hibernate.connection.url">jdbc:mysql://localhost/hibernate_01</property>
11 
12         <!-- <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property> 
13             <property name="hibernate.dialect">org.hibernate.dialect.MySQLInnoDBDialect</property> -->
14         <property name="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>
15 
16         <property name="hibernate.show_sql">true</property>
17 
18         <property name="hibernate.format_sql">true</property>
19 
20         <property name="hibernate.hbm2ddl.auto">update</property>
21 
22         <property name="hibernate.current_session_context_class">thread</property>
23 
24         <property name="hibernate.c3p0.max_size">500</property>
25         <property name="hibernate.c3p0.min_size">20</property>
26         <property name="hibernate.c3p0.max_statements">10</property>
27         <property name="hibernate.c3p0.timeout">2000</property>
28         <property name="hibernate.c3p0.idle_test_period">2000</property>
29         <property name="hibernate.c3p0.acquire_increment">10</property>
30 
31         <mapping resource="com/dx/hibernate005/onetoonebyforigenkey/Deparment.hbm.xml" />
32         <mapping class="com.dx.hibernate005.onetoonebyforigenkey.Deparment" />
33         <mapping resource="com/dx/hibernate005/onetoonebyforigenkey/Manager.hbm.xml" />
34         <mapping class="com.dx.hibernate005.onetoonebyforigenkey.Manager" />
35     </session-factory>
36 </hibernate-configuration>

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