Framework/Hibernate

상속계층에 있는 클래스를 다음과 같이 클래스 별로 Table을 등록

public class Item {
private int itemNumber;
private String itemName;
….
}

public class LargeItem extends Item {
private Vector middleItemList;
…
}

<hibernate-mapping package=”net.maxoft.session.beans”>
<class name=”Item” table=”CategoryItem”>
<id name=”itemNumber” column=”Id” unsaved-value=”null”>
<generator class=”increment”/>
</id>
<property name=”itemName” column=”CategoryName”/>

<joined-subclass name=”LargeItem” table=”LargeCategory”>
<key column=”Id”/>
<bag name=”middleItemList”>
<key column=”parentItem”/>
<one-to-many class=”MiddleItem”/>
</bag>
</joined-subclass>
</class>
</hibernate-mapping>

두개의 User, AccessRight의 java클래스가 단방향 1:1 관계를 이룰때

class User {
   int user;
   AccessRight right;
   ….

}

class AccessRight {
int rightId;
…
}

User와 AccessRight의 매핑파일은 아래와 같다.

——————— User.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=”dev.struts3.model” default-lazy=”false”>
<class name=”User”>
<id name=”user” type=”int” unsaved-value=”null”>
<generator class=”increment”/>
</id>
   …
<many-to-one name=”right”
column=”rightId”
   class=”AccessRight”
   not-null=”true”/>
</class>
</hibernate-mapping>

——————— AccessRight.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=”dev.struts3.model” default-lazy=”false”>
<class name=”AccessRight”>
   <id name=”rightId” type=”int” unsaved-value=”null”>
   <generator class=”increment”/>
   </id>
   …..
</class>
</hibernate-mapping>

User.hbm.xml에 다음절에 의해 User테이블에 rightId가 필드가 AccessRight의 rightId를 외래키로 지정된다.
<many-to-one name=”right” column=”rightId” class=”AccessRight” not-null=”true”/>

[카테고리:] Framework/Hibernate

상속계층의 표현

단방향 One-to-One 관계의 표현