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Hibernate 支持三种类型的继承方式:
-Table per concrete class
. 表与子类之间的独立一对一关系
-Table per subclass
. 每个子类对于一表, 并与主类共享主表
-Table per class hiberarchy
. 表与类的一对多关系
Table per subclass
<hibernate-mapping package="org.lxh.hibernate04">
<class name="TItem " table="TITEM "> <id name="id " column="ID " type="string "> <generator class="assigned " /> </id> <property name="name " column="NAME" type="string" not-null="true" /> <property name="manufacturer " column="MANUFACTURER" type="string" /> <joined-subclass name="TBook " table="TBook "> <key column="ID "></key> <property name="pageCount " type="java.lang.Integer" column="pagecount "></property> </joined-subclass > <joined-subclass name="TDVD " table="TDvd "> <key column="ID "></key> <property name="regionCode " type="java.lang.String" column="regioncode "></property> </joined-subclass> </class>
TBook : private int pageCount
TDVD : private S
TItem :
private String id ;
private String name ; private String manufacturer ;
SQL:
-- 删除表
DROP TABLE TItem ; DROP TABLE TBook ; DROP TABLE TDVD ; -- 创建表 CREATE TABLE TItem ( id varchar(32) not null primary key , name varchar(20) not null , manufacturer varchar(20) ) ; CREATE TABLE TBook ( id varchar(32) not null primary key , pagecount int ) ; CREATE TABLE TDvd ( id varchar(32) not null primary key , regioncode varchar(2) ) ; -- 事务提交 commit ;转载地址:http://qlcci.baihongyu.com/