one-to-one mapping of hibernate
first ,create two tables you want to make the OR mapping.
create table T_PASSPORT( ID NUMBER(4) not null primary key, SERIAL VARCHAR2(30) not null)create table T_PERSON( ID NUMBER(4) not null primary key, NAME VARCHAR2(30) not null, AGE NUMBER(4) not null)alter table T_PASSPORT add constraint FK_ID foreign key (ID) references T_PERSON (ID) on delete cascade;
?
and the hbm.xml of these two tables are:
<?xml version="1.0" encoding="utf-8"?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN""http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"><!-- Mapping file autogenerated by MyEclipse Persistence Tools--><hibernate-mapping> <class name="Reference.TPassport" table="T_PASSPORT" schema="JIL"> <id name="id" type="java.lang.Long"> <column name="ID" precision="4" scale="0" /> <generator constrained="true"> </one-to-one> <property name="serial" type="java.lang.String"> <column name="SERIAL" length="30" not-null="true" /> </property> </class></hibernate-mapping>
?
<?xml version="1.0" encoding="utf-8"?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN""http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"><!-- Mapping file autogenerated by MyEclipse Persistence Tools--><hibernate-mapping> <class name="Reference.TPerson" table="T_PERSON" schema="JIL"> <id name="id" type="java.lang.Long"> <column name="ID" precision="4" scale="0" /> <generator type="java.lang.String"> <column name="NAME" length="30" not-null="true" /> </property> <property name="age" type="java.lang.Long"> <column name="AGE" precision="4" scale="0" not-null="true" /> </property> <one-to-one name="passport" cascade="all" outer-join="true"></one-to-one> </class></hibernate-mapping>
?Test code:
TPerson per = new TPerson();TPassport passport = new TPassport();per.setName("haha");per.setAge(new Long(20));passport.setSerial("123345");passport.setTPerson(per);per.setPassport(passport);session.save(per);
?then output is :
Hibernate: select hibernate_sequence.nextval from dual
Hibernate: insert into JIL.T_PERSON (NAME, AGE, ID) values (?, ?, ?)
Hibernate: insert into JIL.T_PASSPORT (SERIAL, ID) values (?, ?)