Hibernate 一对一共享主键关联的例子

一 表结构：

Sql代码

CREATE TABLE `user` (

`userid` int(11) NOT NULL auto_increment,

`username` varchar(255) NOT NULL default '',

`age` int(2) default NULL,

PRIMARY KEY (`userid`)

) ENGINE=InnoDB DEFAULT CHARSET=gbk;

CREATE TABLE `address` (

`aid` int(11) NOT NULL default '0',

`address` varchar(255) NOT NULL default '',

PRIMARY KEY (`aid`)

) ENGINE=InnoDB DEFAULT CHARSET=gbk;

CREATE TABLE `user` ( `userid` int(11) NOT NULL auto_increment, `username` varchar(255) NOT NULL default '', `age` int(2) default NULL, PRIMARY KEY (`userid`) ) ENGINE=InnoDB DEFAULT CHARSET=gbk; CREATE TABLE `address` ( `aid` int(11) NOT NULL default '0', `address` varchar(255) NOT NULL default '', PRIMARY KEY (`aid`) ) ENGINE=InnoDB DEFAULT CHARSET=gbk;

二 POJO与映射文件：

Java代码

public clas User {

private Integer userid;

private String username;

private Integer age;

private Address address;

//getters setters method...

}

public class Address {

private Integer aid;

private String address;

private User user;

//getters setters method...

}

public class User { private Integer userid; private String username; private Integer age; private Address address; //getters setters method... } public class Address { private Integer aid; private String address; private User user; //getters setters method... }

Java代码

User.hbm.xml

<hibernate-mapping>
<class name="com.pojo.User" table="user" dynamic-insert="true"

dynamic-update="true">

<id name="userid" type="integer">

<column name="userid" sql-type="int" length="11"></column>

<generator class="native"></generator>

</id>

<property name="username" type="string">

<column name="username" sql-type="varchar" length="255"

not-null="true">

</column>

</property>

<property name="age" type="integer">

<column name="age" sql-type="int" length="2"></column>

</property>

<strong><one-to-one name="address" class="com.pojo.Address"

cascade="all">

</one-to-one></strong>

</class>

</hibernate-mapping>

User.hbm.xml <hibernate-mapping> <class name="com.pojo.User" table="user" dynamic-insert="true" dynamic-update="true"> <id name="userid" type="integer"> <column name="userid" sql-type="int" length="11"></column> <generator class="native"></generator> </id> <property name="username" type="string"> <column name="username" sql-type="varchar" length="255" not-null="true"> </column> </property> <property name="age" type="integer"> <column name="age" sql-type="int" length="2"></column> </property> <one-to-one name="address" class="com.pojo.Address" cascade="all"> </one-to-one> </class> </hibernate-mapping>

Java代码

Address.hbm.xml

<hibernate-mapping>
<class name="com.pojo.Address" table="address" dynamic-insert="true" dynamic-update="true">

<id name="aid" type="integer">

<column name="aid" sql-type="int" length="11"></column>

<strong><generator class="foreign">

<param name="property">user</param>

</generator></strong>

</id>

<property name="address" type="string">

<column name="address" sql-type="varchar" length="255"></column>

</property>

<strong><one-to-one name="user" class="com.pojo.User"

constrained="true" cascade="all">

</one-to-one></strong>

</class>

</hibernate-mapping>