Hibernate多对一关系映射

12720171106

package com.tiger.main;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import com.tiger.bean.School;
import com.tiger.bean.Student;
/**
 * n - 1(many to one)
 * 多位学生属于共同的一所大学(many 指的是学生)
 * 一所大学包含多位学生(one 指的是学校)
 * @author tiger
 * @date 2017年11月6日
 */
public class Main_many_one {
  public static void main(String[] args) {
    Configuration cfg = new Configuration().configure("hibernate.cfg.xml");
    SessionFactory sf = cfg.buildSessionFactory();
    Session session = sf.openSession();
    Transaction tx = session.beginTransaction();
    
    //new 一座大学
    School school01 = new School();
    school01.setName("北理工");
    
    School school02 = new School();
    school02.setName("北师珠");
    
    //new 多位学生
    Student student01 = new Student();
    student01.setName("小明");
    student01.setSchool(school01);
    
    Student student02 = new Student();
    student02.setName("小红");
    student02.setSchool(school01);
    
    Student student03 = new Student();
    student03.setName("小黄");
    student03.setSchool(school02);
    
    Student student04 = new Student();
    student04.setName("小黑");
    student04.setSchool(school02);
    
    session.save(student01);
    session.save(student02);
    session.save(student03);
    session.save(student04);
    
    tx.commit();
    
    session.close();
    sf.close();
  }
}

   


   

   
    
    
        
     
            
      
            
      
        
     
        
     
            
      
        
     
        
     
        
     
            
      
        
     
    
    

   
package com.tiger.bean;
/**
 * n 学生有很多
 * @author tiger
 * @date 2017年11月6日
 */
public class Student {
  
  private Integer id;
  private String name;
  private School school;
  
  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 School getSchool() {
    return school;
  }
  public void setSchool(School school) {
    this.school = school;
  }
  public Student() { }
  @Override
  public String toString() {
    return "Student [id=" + id + ", name=" + name + ", school=" + school + "]";
  }
}

   


   

   
    
    
        
     
            
      
            
      
        
     
        
     
            
      
        
     
    
    

   
package com.tiger.bean;
/**
 * 1
 * 一所学生被多位学生共享
 * @author tiger
 * @date 2017年11月6日
 */
public class School {
  
  private Integer id;
  private String name;
  
  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 School() {
    super();
  }
  @Override
  public String toString() {
    return "School [id=" + id + ", name=" + name + "]";
  }
}

   


   
  
    
    
     
      org.hibernate.dialect.MySQL5InnoDBDialect
     
    
     
    
     
      com.mysql.jdbc.Driver
     
    
     
      jdbc:mysql://localhost:3306/book_many_one
     
    
     
      root
     
    
     
      123456
     

    
     
    
     
      30
     
    
     
      10
     
    
     
      5000
     

    
     
    
     
      create
     

    
     
      true