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// Person.java
package bean;
public class Person {
private Integer id;
private String name;
private IdCard idCard;
// set, get省略
}
// IdCard.java
package bean;
import java.util.Date;
public class IdCard {
private Integer id;
private Date useFulLife;
private Person person;
// set, get省略
}
<?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="bean">
<class name="Person">
<cache usage="read-write" />
<id name="id">
<generator class="native"/>
</id>
<property name="name"/>
<one-to-one name="idCard" property-ref="person"/>
</class>
</hibernate-mapping>
// IdCard.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="bean">
<class name="IdCard" table="id_card">
<cache usage="read-write" />
<id name="id">
<generator class="foreign">
<param name="property">person</param>
</generator>
</id>
<property name="useFulLife" column="useful_life"/>
<one-to-one name="person" constrained="true"/>
</class>
</hibernate-mapping>
//One2One.java
package hibernate;
import java.util.Date;
import org.hibernate.Session;
import org.hibernate.Transaction;
import org.hibernate.stat.Statistics;
import bean.IdCard;
import bean.Person;
public class One2One {
public static void main(String[] args) throws InstantiationException, IllegalAccessException, ClassNotFoundException {
add();
testCache();
}
public static void testCache() throws InstantiationException, IllegalAccessException, ClassNotFoundException {
Session session = null;
try {
// 从HibernateUtil中获取session
session = HibernateUtil.getSession();
Person p1 = (Person) session.get(Person.class, 1);
Person p2 = (Person) session.get(Person.class, 1);
Statistics s = HibernateUtil.getSessionFactory().getStatistics();
System.out.println(s);
} finally {
if (null != session)
session.close();
}
try {
session = HibernateUtil.getSession();
Person p3 = (Person) session.get(Person.class, 1);
} finally {
if (null != session)
session.close();
}
}
public static void testQuery() {
Session session = null;
try {
session = HibernateUtil.getSession();
Person person = (Person) session.get(Person.class, 1);
// IdCard idCard = (IdCard)session.load(IdCard.class, 1);
System.out.println("person.class: " + person.getClass());
Person person1 = (Person) session.get(Person.class, 1);
System.out.println("person1.class: " + person1.getClass());
} finally {
if (null != session)
session.close();
}
}
public static void add() {
Session session = null;
Transaction tx = null;
try {
session = HibernateUtil.getSession();
IdCard idCard = new IdCard();
idCard.setUseFulLife(new Date());
Person person = new Person();
person.setName("pserson1 name");
person.setIdCard(idCard);
idCard.setPerson(person);
tx = session.beginTransaction();
session.save(person);
session.save(idCard);
tx.commit();
} finally {
if (null != session) {
session.close();
}
}
}
}
public static void testCache() {
Session session = null;
try {
session = HibernateUtil.getSession();
Person p1 = (Person) session.get(Person.class, 1);
Person p2 = (Person) session.get(Person.class, 1);
Statistics s = HibernateUtil.getSessionFactory().getStatistics();
System.out.println(s);
} finally {
if (null != session)
session.close();
}
try {
session = HibernateUtil.getSession();
Person p3 = (Person) session.get(Person.class, 1);
} finally {
if (null != session)
session.close();
}
}