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最新推荐文章于 2020-05-14 17:37:55 发布

转载最新推荐文章于 2020-05-14 17:37:55 发布 · 205 阅读

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本文介绍了一个使用Java实现的ORM（对象关系映射）Person实体类示例，该类通过注解定义了与数据库表person_inf的映射关系，并包含了一个用于存储学校名称的集合属性。此示例展示了如何将Java对象与数据库表进行映射。

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package com.test.model;
import java.util.ArrayList;
import java.util.List;

import javax.persistence.CollectionTable;
import javax.persistence.Column;
import javax.persistence.ElementCollection;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OrderColumn;
import javax.persistence.Table;

@Entity
@Table(name="person_inf")

public class Person_Set_Map {

   @Id @Column(name="person_id")
   @GeneratedValue(strategy=GenerationType.AUTO)
   private int id;

   private String name;
   private int age;

   @ElementCollection
   @CollectionTable(name="school_inf",
                   joinColumns=@javax.persistence.JoinColumn(name="person_id" , nullable=false ))
   @Column(name="school_name")
   @OrderColumn(name="list_order")
   private List<String> schools=new ArrayList<String>();



   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;
   }

   public int getAge() {
       return age;
   }

   public void setAge(int age) {
       this.age = age;
   }

   public List<String> getSchools() {
       return schools;
   }

   public void setSchools(List<String> schools) {
       this.schools = schools;
   }


}