hibernate<7>承袭关系映射

hibernate<7>----继承关系映射
Department.java

package cn.anycall.hibernate.domain;

import java.util.Set;

public class Department {

	private int id;
	private String name;
	private Set<Employee> emp;
	public Set<Employee> getEmp() {
		return emp;
	}
	public void setEmp(Set<Employee> emp) {
		this.emp = emp;
	}
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	
}

Employee.java

package cn.anycall.hibernate.domain;


public class Employee {

	private int id;
	private String name;
	private Department depart;
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public Department getDepart() {
		return depart;
	}
	public void setDepart(Department depart) {
		this.depart = depart;
	}
}

Sales.java

package cn.anycall.hibernate.domain;

public class Sales extends Employee {

	private int sell;

	public int getSell() {
		return sell;
	}

	public void setSell(int sell) {
		this.sell = sell;
	}
	
}

Skiller.java

package cn.anycall.hibernate.domain;

public class Skiller extends Employee {

	private String skill;

	public String getSkill() {
		return skill;
	}

	public void setSkill(String skill) {
		this.skill = skill;
	}
}

Department.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="cn.anycall.hibernate.domain">


	<class name="Department" >
		<id name="id" column="id">
			<generator class="native"/>
		</id>
		<property name="name"/>
		<set name="emp" inverse="true">
			<key column="depart_id"></key>
			<one-to-many class="Employee"/>
		</set>
	</class>
		
</hibernate-mapping>

Employee.hbm.xml 子类和父类在一张表中

<?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="cn.anycall.hibernate.domain" >


	<class name="Employee" discriminator-value="0">
		<id name="id" column="id">
			<generator class="native"/>
		</id>
		<discriminator column="type" type="int"/>
		<property name="name"/>
		<many-to-one name="depart" column="depart_id" />
		<subclass name="Skiller" discriminator-value="1">
			<property name="skill"/>
		</subclass>
		
		<subclass name="Sales" discriminator-value="2">
			<property name="sell"/>
		</subclass>
	</class>
		
</hibernate-mapping>

Employee.hbm.xml 子类的部分在父类的表中，但子类有自己的表

<?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="cn.anycall.hibernate.domain" >


	<class name="Employee">
		<id name="id" column="id">
			<generator class="native"/>
		</id>
		<property name="name"/>
		<many-to-one name="depart" column="depart_id" />
		<joined-subclass name="Skiller" table="skill">
			<key column="emp_id"></key>
			<property name="skill"></property>
		</joined-subclass>
		<joined-subclass name="Sales" table="sales">
			<key column="emp_id"></key>
			<property name="sell"></property>
		</joined-subclass>
	</class>
		
</hibernate-mapping>

Employee.hbm.xml 一个子类的部分在父类的表中，一个子类的全部在父类中

<?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="cn.anycall.hibernate.domain" >


	<class name="Employee" discriminator-value="0">
		<id name="id" column="id">
			<generator class="native"/>
		</id>
		<discriminator column="type"/>
		<property name="name"/>
		<many-to-one name="depart" column="depart_id" />
		
		<subclass name="Skiller" discriminator-value="1">
			<property name="skill"></property>
		</subclass>
		
		<subclass name="Sales" discriminator-value="2">
			<join table="sales">
				<key column="emp_id"></key>
				<property name="sell"></property>
			</join>
			
		</subclass>
		
		
		
		
	</class>
		
</hibernate-mapping>

Employee.hbm.xml 子类和父类都在单独的表中

<?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="cn.anycall.hibernate.domain" >


	<class name="Employee">
		<id name="id" column="id">
			<generator class="hilo"/>
		</id>
		<property name="name"/>
		<many-to-one name="depart" column="depart_id" />
		
		<union-subclass name="Skiller" table="skiller">
			<property name="skill"></property>
		</union-subclass>
		
		<union-subclass name="Sales" table="Sales">
			<property name="sell"></property>
		</union-subclass>
		
	</class>
		
</hibernate-mapping>

hibernate.cfg.xml

<!DOCTYPE hibernate-configuration PUBLIC
	"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
	"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
	<session-factory>
		<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
		<property name="hibernate.connection.url">jdbc:mysql:///test</property>
		<property name="hibernate.connection.username">root</property>
		<property name="hibernate.connection.password">123456</property>
		<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
		<property name="hbm2ddl.auto">update</property>
		<property name="show_sql">true</property>
		<mapping resource="cn/anycall/hibernate/domain/Department.hbm.xml"/>
		<mapping resource="cn/anycall/hibernate/domain/Employee.hbm.xml"/>
	</session-factory>
</hibernate-configuration>

HibernateUtil.java

package cn.anycall.hibernate;

import java.io.Serializable;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;

public final class HibernateUtil {
	private static SessionFactory sessionFactory;
	public static SessionFactory getSessionFactory() {
		return sessionFactory;
	}

	public static void setSessionFactory(SessionFactory sessionFactory) {
		HibernateUtil.sessionFactory = sessionFactory;
	}

	private HibernateUtil(){
		
	}
	public static Session getSession(){
		return getSessionFactory().openSession();
	}
	static{
		Configuration cfg = new Configuration();
		cfg.configure();
		sessionFactory = cfg.buildSessionFactory();
	}
	public static void add(Object entity){
		Session s = null;
		Transaction tx = null;
		try{
			s = HibernateUtil.getSession();
			tx = s.beginTransaction();
			s.save(entity);
			tx.commit();
		}finally{
			if(s !=null)
				s.close();
		}
	}
	public static void update(Object entity){
		Session s = null;
		Transaction tx = null;
		try{
			s = HibernateUtil.getSession();
			tx = s.beginTransaction();
			s.update(entity);
			tx.commit();
		}finally{
			if(s !=null)
				s.close();
		}
	}
	public static void delete(Object entity){
		Session s = null;
		Transaction tx = null;
		try{
			s = HibernateUtil.getSession();
			tx = s.beginTransaction();
			s.delete(entity);
			tx.commit();
		}finally{
			if(s !=null)
				s.close();
		}
	}
	public static Object get(Class clazz, Serializable id){
		Session s = null;
		try{
			s = HibernateUtil.getSession();
			Object obj = s.get(clazz, id);
			return obj;
		}finally{
			if(s !=null)
				s.close();
		}
	}
}

Extends.java

package cn.anycall.hibernate;

import java.util.HashSet;
import java.util.Set;

import org.hibernate.Session;
import org.hibernate.Transaction;

import cn.anycall.hibernate.domain.Department;
import cn.anycall.hibernate.domain.Employee;
import cn.anycall.hibernate.domain.Sales;
import cn.anycall.hibernate.domain.Skiller;

public class Extends {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Department depart = add();
		query(3);
	}
	static Department add(){
		Session s = null;
		Transaction tx = null;
		try{
			s = HibernateUtil.getSession();
			tx = s.beginTransaction();
			Department depart = new Department();
			depart.setName("depart name");
			
			Employee emp = new Employee();
			emp.setDepart(depart);
			emp.setName("employee name");
			
			Skiller sk = new Skiller();
			sk.setDepart(depart);
			sk.setName("employee skill");
			sk.setSkill("skill");
			Sales sa = new Sales();
			sa.setDepart(depart);
			sa.setName("employee sales");
			sa.setSell(2);
			
			Set<Employee> set = new HashSet<Employee>();
			set.add(sa);
			set.add(emp);
			set.add(sk);
			depart.setEmp(set);
			s.save(emp);
			s.save(sa);
			s.save(sk);
			s.save(depart);
			
			tx.commit();
			System.out.println("end");
			return depart;
		}finally{
			if(s!=null)
				s.close();
		}
	}
	
	static void query(int id){
		Session s = null;
		try{
			s = HibernateUtil.getSession();
			Employee em = (Employee) s.get(Employee.class, id);
			System.out.println("end");
			System.out.println(em.getClass());
			//Hibernate.initialize(depart.getEmp());
		}finally{
			if(s!=null)
				s.close();
		}
	}

}

hibernate<7>承袭关系映射

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