Spring+Hibernate集成开发只1对多实例_spring heibernate 一个表对应多个实体java类-优快云博客

本文介绍了一个简单的Hibernate一对一关联映射案例，包括数据库表结构的设计、对应的Java实体类定义、hbm.xml映射文件及Spring配置文件等内容，并提供了一个测试类来验证整个流程。

数据库脚本：

create table customer (id varchar(10) primary key,name varchar(10));

create table address (id varchar(10) primary key,

detail varchar(10),

customerid varchar(10),

foreign key(customerid) references customer(id));

insert into customer values("1","john");

insert into customer values("2","marry");

insert into customer values("3","cathy");

insert into address values("1","beijng","1");

insert into address values("2","tianjin","1");

insert into address values("3","shanghai","2");

insert into address values("4","guangzhou","2");

insert into address values("5","chongqing","3");

insert into address values("6","shenzhen","3");

或者创建表后用如下语句增加外键约束

alter table address add constraint pf foreign key(customerid) references customer(id);

Domain对象

package ch9.SimpleOneToMany;

import java.util.HashSet;

import java.util.Set;

/**

* Customer generated by MyEclipse Persistence Tools

public class Customer implements java.io.Serializable {

// Fields

private String id;

private String name;

private Set addresses = new HashSet(0);

// Constructors

/** default constructor */

public Customer() {

}

/** minimal constructor */

public Customer(String id) {

this.id = id;

}

/** full constructor */

public Customer(String id, String name, Set addresses) {

this.id = id;

this.name = name;

this.addresses = addresses;

}

// Property accessors

public String getId() {

return this.id;

}

public void setId(String id) {

this.id = id;

}

public String getName() {

return this.name;

}

public void setName(String name) {

this.name = name;

}

public Set getAddresses() {

return this.addresses;

}

public void setAddresses(Set addresses) {

this.addresses = addresses;

}

package ch9.SimpleOneToMany;

/**

* Address generated by MyEclipse Persistence Tools

public class Address implements java.io.Serializable {

// Fields

private String id;

private Customer customer;

private String detail;

// Constructors

/** default constructor */

public Address() {

}

/** minimal constructor */

public Address(String id) {

this.id = id;

}

/** full constructor */

public Address(String id, Customer customer, String detail) {

this.id = id;

this.customer = customer;

this.detail = detail;

}

// Property accessors

public String getId() {

return this.id;

}

public void setId(String id) {

this.id = id;

}

public Customer getCustomer() {

return this.customer;

}

public void setCustomer(Customer customer) {

this.customer = customer;

}

public String getDetail() {

return this.detail;

}

public void setDetail(String detail) {

this.detail = detail;

}

hbm文件：

<?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>

</id>

</property>

<key>

</key>

<one-to-many class="ch9.SimpleOneToMany.Address" />

</set>

</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>

</id>

<many-to-one name="customer" class="ch9.SimpleOneToMany.Customer" lazy="false" >

</many-to-one>

</property>

</class>

</hibernate-mapping>

DAO接口：

package ch9.SimpleOneToMany;

import java.util.List;

public interface IDAO {

public List getAllCustomer();

}

DAO实现：

package ch9.SimpleOneToMany;

import java.util.ArrayList;

import java.util.List;

import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

public class TestDAOImpl extends HibernateDaoSupport implements IDAO {

public List getAllCustomer() {

return getHibernateTemplate().find("from Customer");

}

配置文件：

<?xml version="1.0" encoding="UTF-8"?>

<beans

xmlns="http://www.springframework.org/schema/beans"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd">

<value>com.mysql.jdbc.Driver</value>

</property>

</property>

</property>

<value>jdbc:mysql://localhost:3306/spring</value>

</property>

</bean>

</property>

<list>

<value>ch9/SimpleOneToMany/Address.hbm.xml</value>

<value>ch9/SimpleOneToMany/Customer.hbm.xml</value>

</list>

</property>

<props>

<prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>

</props>

</property>

</bean>

</property>

</bean>

</beans>

测试代码：

package ch9.SimpleOneToMany;

import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Test {

/**

* @param args

public static void main(String[] args) {

ApplicationContext context=new ClassPathXmlApplicationContext("ch9/SimpleOneToMany/applicationContext.xml");

TestDAOImpl testDAOImpl=(TestDAOImpl)context.getBean("testDAO");

List result=new ArrayList();

result=testDAOImpl.getAllCustomer();

for (Iterator iter = result.iterator(); iter.hasNext();) {

Customer element = (Customer) iter.next();

System.out.println(element.getName()+element.getAddresses().size());

Iterator iter1=element.getAddresses().iterator();

while(iter1.hasNext()){

Address element1 = (Address) iter1.next();

System.out.println("--"+element1.getDetail());

}

结果：

Hibernate: select customer0_.id as id1_, customer0_.name as name1_ from spring.customer customer0_ Hibernate: select addresses0_.customerid as customerid1_, addresses0_.id as id1_, addresses0_.id as id0_0_, addresses0_.customerid as customerid0_0_, addresses0_.detail as detail0_0_ from spring.address addresses0_ where addresses0_.customerid=? Hibernate: select addresses0_.customerid as customerid1_, addresses0_.id as id1_, addresses0_.id as id0_0_, addresses0_.customerid as customerid0_0_, addresses0_.detail as detail0_0_ from spring.address addresses0_ where addresses0_.customerid=? Hibernate: select addresses0_.customerid as customerid1_, addresses0_.id as id1_, addresses0_.id as id0_0_, addresses0_.customerid as customerid0_0_, addresses0_.detail as detail0_0_ from spring.address addresses0_ where addresses0_.customerid=? john2 --tianjin --beijng marry2 --guangzhou --shanghai cathy2 --shenzhen --chongqing