分享一下我老师大神的人工智能教程！零基础，通俗易懂！http://blog.csdn.net/jiangjunshow
也欢迎大家转载本篇文章。分享知识，造福人民，实现我们中华民族伟大复兴！
student：
/** * */package com.wonders.task.sample.bo;import javax.persistence.CascadeType;import javax.persistence.Column;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.Id;import javax.persistence.JoinColumn;import javax.persistence.ManyToOne;import javax.persistence.Table;import org.hibernate.annotations.GenericGenerator;/** * @ClassName: Student * @Description: TODO(这里用一句话描述这个类的作用) * @author zhoushun * @date 2014年2月27日 上午11:48:30 * */@Entity @Table(name="Z_STUDENT") public class Student { private String id; private String name; private Clazz clazz; @Id @GeneratedValue(generator="system-uuid") @GenericGenerator(name="system-uuid", strategy = "uuid") @Column(name = "ID") public String getId() { return id; } public void setId(String id) { this.id = id; } @Column(name = "NAME", length = 500) public String getName() { return name; } public void setName(String name) { this.name = name; } @ManyToOne(cascade={CascadeType.ALL}) @JoinColumn(name="class_id") //student类中对应外键的属性：classid public Clazz getClazz() { return clazz; } public void setClazz(Clazz clazz) { this.clazz = clazz; } }classes:
/** * */package com.wonders.task.sample.bo;import java.util.Set;import javax.persistence.CascadeType;import javax.persistence.Column;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.Id;import javax.persistence.OneToMany;import javax.persistence.Table;import org.hibernate.annotations.GenericGenerator;/** * @ClassName: Clazz * @Description: TODO(这里用一句话描述这个类的作用) * @author zhoushun * @date 2014年2月27日 上午11:48:47 * */@Entity @Table(name="Z_CLASS") public class Clazz implements java.io.Serializable{ /** * */ private static final long serialVersionUID = -6224738252966513441L; private String id; private String name; private Set<Student> set; @Id @GeneratedValue(generator="system-uuid") @GenericGenerator(name="system-uuid", strategy = "uuid") @Column(name = "ID") public String getId() { return id; } public void setId(String id) { this.id = id; } @Column(name = "NAME", length = 500) public String getName() { return name; } public void setName(String name) { this.name = name; } @OneToMany(cascade=CascadeType.ALL,mappedBy="clazz") //@OneToMany(cascade=CascadeType.ALL,mappedBy="clazz",fetch=FetchType.EAGER) 关闭延迟加载。 public Set<Student> getSet() { return set; } public void setSet(Set<Student> set) { this.set = set; } }/** * */package com.wonders.task.sample.main;import java.util.HashSet;import java.util.Set;import javax.annotation.Resource;import org.hibernate.Hibernate;import org.hibernate.Session;import org.springframework.context.ApplicationContext;import org.springframework.context.annotation.Scope;import org.springframework.context.support.ClassPathXmlApplicationContext;import org.springframework.orm.hibernate3.HibernateTemplate;import org.springframework.stereotype.Service;import org.springframework.transaction.annotation.Propagation;import org.springframework.transaction.annotation.Transactional;import com.wonders.schedule.util.SpringBeanUtil;import com.wonders.task.sample.ITaskService;import com.wonders.task.sample.bo.Clazz;import com.wonders.task.sample.bo.Student;/** * @ClassName: TestMain * @Description: TODO(这里用一句话描述这个类的作用) * @author zhoushun * @date 2014年2月27日 下午12:18:44 * */@Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class)/* 功能模块入口点，beanid即数据库配置中的name */@Service("testMain")@Scope("prototype")public class TestMain { private HibernateTemplate hibernateTemplate; public HibernateTemplate getHibernateTemplate() { return hibernateTemplate; } //注入hibernateTemplate @Resource(name="hibernateTemplate") public void setHibernateTemplate(HibernateTemplate hibernateTemplate) { this.hibernateTemplate = hibernateTemplate; } public void test(){ Session session = this.getHibernateTemplate().getSessionFactory().getCurrentSession(); Clazz c2 = (Clazz) session.get(Clazz.class, "8a81a97c4471c661014471c669360002"); //Clazz c2 = (Clazz) main.getHibernateTemplate().get(Clazz.class, "8a81a97c4471c661014471c669360002"); Hibernate.initialize(c2.getSet()); System.out.println("11111111111111111111111"); //session.close(); Set<Student> sss = c2.getSet(); System.out.println("22222222222222222"); for(Student s: sss){ System.out.println(s.getName()); } } public static void main(String[] args){ ApplicationContext applicationContext = null; String[] fileUrl = new String[]{"classpath*:applicationContext*.xml"}; applicationContext = new ClassPathXmlApplicationContext(fileUrl); Student s1 = new Student(); Student s2 = new Student(); Clazz c1 = new Clazz(); c1.setName("1班"); s1.setName("z1"); s1.setClazz(c1); s2.setName("z2"); s2.setClazz(c1); Set<Student> set = new HashSet<Student>(); set.add(s1);set.add(s2); c1.setSet(set); TestMain main = (TestMain)SpringBeanUtil.getBean("testMain"); //main.getHibernateTemplate().save(c1); // Session session = main.getHibernateTemplate().getSessionFactory().openSession();// Clazz c2 = (Clazz) session.get(Clazz.class, "8a81a97c4471c661014471c669360002");// //Clazz c2 = (Clazz) main.getHibernateTemplate().get(Clazz.class, "8a81a97c4471c661014471c669360002");// Hibernate.initialize(c2.getSet());// // System.out.println("11111111111111111111111");// session.close();// Set<Student> sss = c2.getSet();// System.out.println("22222222222222222");// for(Student s: sss){// // System.out.println(s.getName());// } main.test(); //main.getHibernateTemplate().delete(c2); }}级联保存
方法1：自动维护两表关系，mappedby 为被拥维护方，即对应的student为维护方
Student s1 = new Student(); Student s2 = new Student(); Clazz c1 = new Clazz(); c1.setName("1班"); s1.setName("z1"); s1.setClazz(c1); s2.setName("z2"); s2.setClazz(c1); TestMain main = (TestMain)SpringBeanUtil.getBean("testMain"); main.getHibernateTemplate().save(s1); main.getHibernateTemplate().save(s2);Student s1 = new Student(); Student s2 = new Student(); Clazz c1 = new Clazz(); c1.setName("1班"); s1.setName("z1"); s1.setClazz(c1); s2.setName("z2"); s2.setClazz(c1); Set<Student> set = new HashSet<Student>(); set.add(s1);set.add(s2); c1.setSet(set); TestMain main = (TestMain)SpringBeanUtil.getBean("testMain"); main.getHibernateTemplate().save(c1);关于延迟加载：
http://blog.csdn.net/z69183787/article/details/20049409
http://blog.csdn.net/z69183787/article/details/17136627
给我老师的人工智能教程打call！http://blog.csdn.net/jiangjunshow
