多对一关联映射-优快云博客

本文链接：https://blog.youkuaiyun.com/serbry0033/article/details/6878117

本文介绍了一个基于Struts2框架的UserAction类，用于获取房屋列表，并通过Hibernate ORM技术实现数据持久化。演示了如何定义House实体类及其与Model类的关联，同时提供了Hibernate映射文件及DAO层的具体实现。

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Action：

public class UserAction extends ActionSupport {

	private static final long serialVersionUID = -7088643274209779166L;
	
	private List<House> list;
	
	public String execute(){
		this.setList(new HouseDao().getAllHouse());
		return SUCCESS;
	}
	
	public void setList(List<House> list){
		this.list = list;
	}
	
	public List<House> getList(){
		return list;
	}
}

House：只写了两个属性

public class House {
	
	private int id;
	private String house_floorname;
	private String house_cellname;
	private Model model;
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getHouse_floorname() {
		return house_floorname;
	}
	public void setHouse_floorname(String house_floorname) {
		this.house_floorname = house_floorname;
	}
	public String getHouse_cellname() {
		return house_cellname;
	}
	public void setHouse_cellname(String house_cellname) {
		this.house_cellname = house_cellname;
	}
	public Model getModel() {
		return model;
	}
	public void setModel(Model model) {
		this.model = model;
	}
	
	
}

House 映射文件xml

 <hibernate-mapping>
    	<class name="com.s.www.model.House">
    		<id name="id" type="java.lang.Integer">
    			<generator class="native"/>
    		</id>
    		<property name="house_floorname"></property>
    		<property name="house_cellname"></property>
    		<!--这里级联不用设也是可以的 save update的时候 先存一那端的数据-->
    		<many-to-one name="model"  column="model_id" cascade="all" lazy="false"></many-to-one>
    	</class>
    </hibernate-mapping>

model ：

public class Model {
	
	private int id;
	private String name;
	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;
	}
	
	
}

model 映射文件

<hibernate-mapping>
    	<class name="com.s.www.model.Model">
    		<id name="id" type="java.lang.Integer">
    			<generator class="native"></generator>
    		</id>
    		<property name="name"/>
    	</class>
    </hibernate-mapping>

HouseDao：

	public List<House> getAllHouse(){
		Session session = CreateHibernateExport.
					getSessionFactory().openSession();
		Transaction trans = session.beginTransaction();
		@SuppressWarnings("unchecked")
		List<House> list = session.createQuery("from House").list();
		trans.commit();
		session.flush();
		session.close();
		return list;
	}

其他的都差不多了我用的是 mysql 可以正常运行的！