hibernate集合映射学习笔记

12520171102

package com.tiger.domain;import java.util.Arrays;import java.util.List;import java.util.Map;import java.util.Set;/** * pojo类 * @author tiger * @date 2017年11月2日 */public class Student {private Integer id;private String name;private List books;private String[] skill;private Set hobbies;private Map cource;public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public List getBooks() {return books;}public void setBooks(List books) {this.books = books;}public Set getHobbies() {return hobbies;}public void setHobbies(Set hobbies) {this.hobbies = hobbies;}public Map getCource() {return cource;}public void setCource(Map cource) {this.cource = cource;}public String[] getSkill() {return skill;}public void setSkill(String[] skill) {this.skill = skill;}public Student(Integer id, String name, List books, Set hobbies, Map cource,String[] skill) {super();this.id = id;this.name = name;this.books = books;this.hobbies = hobbies;this.cource = cource;this.skill = skill;}public Student() {super();}@Overridepublic String toString() {return "Student [id=" + id + ", name=" + name + ", books=" + books + ", hobbies=" + hobbies + ", cource="+ cource + ", skill=" + Arrays.toString(skill) + "]";}}125201711021、list 和 array 需要设置主键，而Map 和 set 不需要设置主键2、外键所有集合都必须设置。package com.tiger.main;import java.util.ArrayList;import java.util.HashMap;import java.util.HashSet;import java.util.List;import java.util.Map;import java.util.Set;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.Transaction;import org.hibernate.cfg.Configuration;import com.tiger.domain.Student;public class Main {public static void main(String[] args) {Configuration configuration = new Configuration().configure("hibernate.cfg.xml");SessionFactory sessionFactory = configuration.buildSessionFactory();Session session = sessionFactory.openSession();Transaction transaction = session.beginTransaction();Student student = new Student();student.setName("小明");List books = new ArrayList<>();books.add("编程思想");books.add("编程思想2");String[] strings = {"敲代码","游泳"};Set hobbies = new HashSet();hobbies.add("打球");hobbies.add("看电影");Map maps = new HashMap<>();maps.put("高数", "23");maps.put("体育", "98");student.setBooks(books);student.setSkill(strings);student.setCource(maps);student.setHobbies(hobbies);session.save(student);transaction.commit();//事务提交List students = session.createQuery(" from Student").list();System.out.println(students);session.close();sessionFactory.close();}}