Hibernate集合映射与关联关系
1.利用hibernate配置文件生成信息表并系统生成dao包和Bean包及配置文件信息
2.在student的JavaBean文件里添加Score的map集合并在其*.hbm.xml中添加与Score联系的配置信息
3.在*.hbm.xml配置文件中进行映射，关联
双向
<set name="student"table="class">
<key column="classNo"></key>
<one-to-many class="Bean.Student"/>
</set>
单向
<many-to-one name="class"class="Bean.Class" column="classNo"></many-to-one>
Class.java
public class Class implementsjava.io.Serializable {
// Fields
private Integer classNo;
private String className;
private String classDate;
//单向时删除
// privateSet<Student> student = new HashSet<Student>();
Score.java
public class Score implementsjava.io.Serializable {
// Fields
private Integer id;
private String studentName;
Student.java
public class Student implementsjava.io.Serializable {
// Fields
private Integer studentNo;
private String studentName;
private String studentSex;
private String studentBirthday;
private Class studentClass;
private Map<String,String> Score= new HashMap<String,String>();
// Constructors
Dao包中以class1.java为例
class1.java
package Dao;
importorg.hibernate.Session;
/**
* Data access object (DAO) for domain model
* @author MyEclipse Persistence Tools
*/
public class class1 implements IBaseHibernateDAO {
public Session getSession() {
//FIXME: Implement this method
return null;
}
HibernateSessionFactory.java
importorg.hibernate.HibernateException;
importorg.hibernate.Session;
importorg.hibernate.cfg.Configuration;
importorg.hibernate.service.ServiceRegistry;
importorg.hibernate.service.ServiceRegistryBuilder;
/**
* Configures and provides access to Hibernatesessions, tied to the
* current thread of execution. Follows the Thread Local Session
* pattern, see {@link http://hibernate.org/42.html }.
*/
public class HibernateSessionFactory {
/**
* Location of hibernate.cfg.xml file.
* Location should be on the classpathas Hibernate uses
* #resourceAsStream style lookup for itsconfiguration file.
* The default classpath location ofthe hibernate config file is
* in the default package. Use#setConfigFile() to update
* the location of the configuration filefor the current session.
*/
private static final ThreadLocal<Session> threadLocal = new ThreadLocal<Session>();
private static org.hibernate.SessionFactory sessionFactory;
private static String CONFIG_FILE_LOCATION = "/hibernate.cfg.xml";
private static Configuration configuration = new Configuration();
private static ServiceRegistry serviceRegistry;
private static String configFile = CONFIG_FILE_LOCATION;
static {
try {
configuration.configure(configFile);
serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();
sessionFactory = configuration.buildSessionFactory(serviceRegistry);
} catch (Exception e) {
System.err.println("%%%% Error Creating SessionFactory%%%%");
e.printStackTrace();
}
}
private HibernateSessionFactory() {
}
/**
* Returns the ThreadLocal Sessioninstance. Lazy initialize
* the <code>SessionFactory</code> if needed.
*
* @return Session
* @throws HibernateException
*/
public static Session getSession() throws HibernateException{
Session session = (Session) threadLocal.get();
if (session == null || !session.isOpen()) {
if (sessionFactory == null) {
rebuildSessionFactory();
}
session = (sessionFactory != null) ? sessionFactory.openSession()
:null;
threadLocal.set(session);
}
return session;
}
/**
* Rebuild hibernate session factory
*
*/
public static void rebuildSessionFactory() {
try {
configuration.configure();
serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();
sessionFactory = configuration.buildSessionFactory(serviceRegistry);
} catch (Exception e) {
System.err.println("%%%% Error Creating SessionFactory%%%%");
e.printStackTrace();
}
}
/**
* Close the single hibernate session instance.
*
* @throws HibernateException
*/
public static void closeSession() throws HibernateException {
Session session = (Session) threadLocal.get();
threadLocal.set(null);
if (session != null) {
session.close();
}
}
/**
* return session factory
*
*/
public static org.hibernate.SessionFactorygetSessionFactory() {
return sessionFactory;
}
public static void setConfigFile(String configFile){
HibernateSessionFactory.configFile = configFile;
sessionFactory = null;
}
/**
* return hibernate configuration
*
*/
public static Configuration getConfiguration() {
return configuration;
}
Classs.hbm.xml
Score.hbm.xml
Student.hbm.xml
https://download.csdn.net/download/qq_40567438/10468253