hibernate实现一对一关系映射(基于主键)

Department类：

package cn.lfd.hibernate.n21.one2one;
public class Department {
private Integer deptID;
private String deptName;
private Manager mgr;
public Integer getDeptID() {
return deptID;
}
public void setDeptID(Integer deptID) {
this.deptID = deptID;
}
public String getDeptName() {
return deptName;
}
public void setDeptName(String deptName) {
this.deptName = deptName;
}
public Manager getMgr() {
return mgr;
}
public void setMgr(Manager mgr) {
this.mgr = mgr;
}

}
Manager类:
package cn.lfd.hibernate.n21.one2one;
public class Manager {
private Integer mgrId;
private String mgrName;
private Department dept;
public Integer getMgrId() {
return mgrId;
}
public void setMgrId(Integer mgrId) {
this.mgrId = mgrId;
}
public String getMgrName() {
return mgrName;
}
public void setMgrName(String mgrName) {
this.mgrName = mgrName;
}
public Department getDept() {
return dept;
}
public void setDept(Department dept) {
this.dept = dept;
}

}
Manaeger.hbm.xml文件:
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 2014-9-29 8:46:32 by Hibernate Tools 3.4.0.CR1 -->
<hibernate-mapping package="cn.lfd.hibernate.n21.one2one">
<class name="Manager" table="MANAGERS">
<id name="mgrId" type="java.lang.Integer">
<column name="MGR_ID" />
<generator class="native" />
</id>
<property name="mgrName" type="java.lang.String">
<column name="MGR_NAME" length="40"/>
</property>

<one-to-one name="dept" class="Department">
</one-to-one>
</class>
</hibernate-mapping>Department.hbm.xml文件：
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 2014-9-29 8:46:32 by Hibernate Tools 3.4.0.CR1 -->
<hibernate-mapping package="cn.lfd.hibernate.n21.one2one">
<class name="Department" table="DEPARTMENTS">
<id name="deptID" type="java.lang.Integer">
<column name="DEPT_ID" />
<generator class="foreign">
<param name="property">mgr</param>
</generator>
</id>
<property
4000
name="deptName" type="java.lang.String">
<column name="DEPT_NAME"/>
</property>

<!-- 映射一对一的关系 constrained="true"给当前主键添加外键约束-->
<one-to-one name="mgr" class="Manager" constrained="true"></one-to-one>
</class>
</hibernate-mapping>