Hibernate Inheritance Table structure

There is product, book, clothes three sheets

Product:id,name

book:id, Name,pagecount

clothes:id, name, Size

Create three Sheets

Product TableCreate TableProduct (id number(2)Primary Key, namevarchar2(Ten) ); Book tableCreate Tablebooktbl (id number(2), namevarchar2(Ten), PageCount number(3),    Foreign Key(id)ReferencesProduct (id));Createsequence Book_seq increment by 1Start with 1nomaxvalue nominvalue nocache;CREATE  TRIGGERBook_trigger beforeINSERT  onBooktbl forEach ROW when(new.id is NULL)beginSelectBook_seq.nextval into: new.id fromdual;End;Drop Tablebooktbl;Dropsequence Book_seq;bropTriggerbook_trigger; Clothing TableCreate Tableclothestbl (id number(2)ReferencesProduct (id), Namevarchar2(Ten), closize number(5));Createsequence Clothes_seqincrement by 1Start with 1nomaxvalue nominvalue nocache;CREATE TRIGGERClo_triggerbeforeINSERT  onClothestbl foreach ROW when(new.id is NULL)beginSelectClothes_seq.nextval into: new.id fromdual;End;Drop Tableclothestbl;Dropsequence Clothes_seq;bropTriggerclo_trigger;

Product.hlm.xml

  <Class name="com.amaker.extendmodel.Product"Table="Product">           <ID Name="id">               <Generator class="native"></Generator>           </Id>           <Property name="name"></Property>                       <Joined-Subclass Name="com.amaker.extendmodel.Book"Table="booktbl">                        <Key column="id"></Key>               <Property name="pagecount"></Property>           </Joined-Subclass>                        <Joined-Subclass Name="com.amaker.extendmodel.Clothes"Table="clothestbl">                        <Key column="id"></Key>               <Property name="size"column="closize"></Property>           </Joined-Subclass>    </Class> 

<mapping resource= "com/amaker/extendmodel/product.hbm.xml"/>

Hibernate Inheritance Table structure