Hibernate组件映射-优快云博客

本文介绍了一种粒度划分的设计方案，通过将person表拆分为Name和Info两个对象，实现更灵活的数据管理和操作。同时展示了如何使用Java进行实体类定义及Hibernate框架进行数据持久化操作。

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一.粒度划分

person表

create table person(
id varchar(32) primary key,
address varchar(40),
postcode int,
firstname varchar(10),
lastname varchar(10)
)

然后分成了两个对象Info 和Name

package component;

public class Info {

	private String address;
	private int postcode;

	

	public String getAddress() {
		return address;
	}

	public void setAddress(String address) {
		this.address = address;
	}

	public int getPostcode() {
		return postcode;
	}

	public void setPostcode(int postcode) {
		this.postcode = postcode;
	}
}


package component;

public class Name {
	private String firstname;
	private String lastname;

	public String getFirstname() {
		return firstname;
	}

	public void setFirstname(String firstname) {
		this.firstname = firstname;
	}

	public String getLastname() {
		return lastname;
	}

	public void setLastname(String lastname) {
		this.lastname = lastname;
	}
}


package component;

public class Person {
	private String id;
	private Info info;
	private Name name;
	public String getId() {
		return id;
	}
	public void setId(String id) {
		this.id = id;
	}
	public Info getInfo() {
		return info;
	}
	public void setInfo(Info info) {
		this.info = info;
	}
	public Name getName() {
		return name;
	}
	public void setName(Name name) {
		this.name = name;
	}

}

映射文件

		<component name="name" class="component.Name">
			<property name="firstname" type="java.lang.String">
				<column name="firstname" length="10" />
			</property>
			<property name="lastname" type="java.lang.String">
				<column name="lastname" length="10" />
			</property>

		</component>
		<component name="info" class="component.Info">
			<property name="address" type="java.lang.String">
				<column name="address" length="40" />
			</property>
			<property name="postcode" type="java.lang.Integer">
				<column name="postcode" />
			</property>
		</component>

测试

package component;

import java.util.List;

import org.hibernate.Query;
import org.hibernate.Session;

import config.HibernateSessionFactory;

public class Test {
	public void insert() {
		Person person = new Person();
		Name name = new Name();
		Info info = new Info();
		name.setFirstname("优快云");
		name.setLastname("Simon");
		info.setAddress("China");
		info.setPostcode(450000);
		Session session = HibernateSessionFactory.getSession();
		session.beginTransaction();
		person.setInfo(info);
		person.setName(name);
		session.save(person);
		session.beginTransaction().commit();
		session.close();
	}

	public void sel() {

		Session session = HibernateSessionFactory.getSession();
		Query query = session.createQuery("from Person");
		List list = query.list();
		Person person = (Person) list.get(0);
		System.out.println(person.getName().getFirstname()
				+ person.getName().getLastname());
	}

	public static void main(String[] args) {
		new Test().sel();
	}

}

二.复合主键

待续。。。。