gan068

資料表 ObjA{ column:id,name PK:id } ObjB{ column:ref_obja_id,name PK:ref_obja_id FK:ref_obja_id } DAO資料模型

package eg;public class ObjA{ private Integer Id; private String Name; private ObjB ObjB; /* getter and setter 省略 */}

package eg;public class ObjB{ private Integer RefObjAId; private String Name; private ObjA RefObjA; /* getter and setter 省略 */}

Hibernte mapping檔案 ObjA.hbm.xml

 <?xml version="1.0"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <hibernate-mapping package="eg"> <class name="ObjA" table="ObjA"> <id column="id" name="Id" type="integer">   <generator class="native"> </id> <property column="name" length="50" name="Name" type="string"/> <one-to-one name="ObjB"   class="ObjB"   cascade="all" /> </class> </hibernate-mapping>

ObjB.hbm.xml

<?xml version="1.0"?>  <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <hibernate-mapping package="eg"> <class name="ObjB" table="ObjB"> <id column="ref_obja_id" name="RefObjAId" type="integer">   <generator class="foreign">     <param name="property">RefObjA</param>   </generator> </id> <property column="name" generated="never" length="50" name="Name" type="string"/> <one-to-one name="RefObjA"   class="ObjA"   constrained="true" /> </class> </hibernate-mapping>