Hibernate中many-to-one unique="true" 和one-to-one
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Hibernate one-to-one有两种形式:一是共享主键的形式进行关联,二就是独立外键的形式进行关联:
例如:人(Person)和护照(Passwort)的关系是一对一的的关系:
1)共享主键的形式:
1)主表映射文件的写法:
<class name="Person" table="t_person">
<id name="id" column="p_id">
<generator class="increment"> </generator>
</id>
<property name="name" column="p_name" type="string"> </property>
<property name="birthday" column="p_birthday" type="date"> </property>
<property name="email" column="email" type="string"> </property>
<property name="phone" column="phone" type="string"> </property>
<one-to-one name="passport" cascade="all"> </one-to-one>
</class>
2)辅表映射文件的写法:
<class name="Passport" table="t_passport">
<id name="id" column="p_id">
<generator class="foreign">
<param name="property">person </param> //person为Passport中的关系属性
</generator>
</id>
<property name="serial" column="p_serial" type="string"> </property>
<property name="expiry" column="p_expiry" type="integer"> </property>
<property name="date" column="p_date" type="date"> </property>
<one-to-one name="person" constrained="true" cascade="all">
</one-to-one>
</class>
2)独立外键的关联方式:
1)主表映射文件的写法:
<class name="Person" table="t_person">
<id name="id" column="p_id">
<generator class="increment"> </generator>
</id>
<property name="name" column="p_name" type="string"> </property>
<property name="birthday" column="p_birthday" type="date"> </property>
<property name="email" column="email" type="string"> </property>
<property name="phone" column="phone" type="string"> </property>
<one-to-one name="passport" property-ref="person" cascade="all"> </one-to-one> //person为实体类Passwort中的关系属性。
</class>
2)辅表映射文件的写法:
<class name="Passport" table="t_passport">
<id name="id" column="p_id">
<generator class="increment">
</generator>
</id>
<property name="serial" column="p_serial" type="string"> </property>
<property name="expiry" column="p_expiry" type="integer"> </property>
<property name="date" column="p_date" type="date"> </property>
<many-to-one unique="true" name="person" column="pss_id">//pss_id为外键列
</one-to-one>
</class>
例如:人(Person)和护照(Passwort)的关系是一对一的的关系:
1)共享主键的形式:
1)主表映射文件的写法:
<class name="Person" table="t_person">
<id name="id" column="p_id">
<generator class="increment"> </generator>
</id>
<property name="name" column="p_name" type="string"> </property>
<property name="birthday" column="p_birthday" type="date"> </property>
<property name="email" column="email" type="string"> </property>
<property name="phone" column="phone" type="string"> </property>
<one-to-one name="passport" cascade="all"> </one-to-one>
</class>
2)辅表映射文件的写法:
<class name="Passport" table="t_passport">
<id name="id" column="p_id">
<generator class="foreign">
<param name="property">person </param> //person为Passport中的关系属性
</generator>
</id>
<property name="serial" column="p_serial" type="string"> </property>
<property name="expiry" column="p_expiry" type="integer"> </property>
<property name="date" column="p_date" type="date"> </property>
<one-to-one name="person" constrained="true" cascade="all">
</one-to-one>
</class>
2)独立外键的关联方式:
1)主表映射文件的写法:
<class name="Person" table="t_person">
<id name="id" column="p_id">
<generator class="increment"> </generator>
</id>
<property name="name" column="p_name" type="string"> </property>
<property name="birthday" column="p_birthday" type="date"> </property>
<property name="email" column="email" type="string"> </property>
<property name="phone" column="phone" type="string"> </property>
<one-to-one name="passport" property-ref="person" cascade="all"> </one-to-one> //person为实体类Passwort中的关系属性。
</class>
2)辅表映射文件的写法:
<class name="Passport" table="t_passport">
<id name="id" column="p_id">
<generator class="increment">
</generator>
</id>
<property name="serial" column="p_serial" type="string"> </property>
<property name="expiry" column="p_expiry" type="integer"> </property>
<property name="date" column="p_date" type="date"> </property>
<many-to-one unique="true" name="person" column="pss_id">//pss_id为外键列
</one-to-one>
</class>
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