惠州Java中的JPA嵌入式实例_北大青鸟IT学校

上一篇文章惠州北大青鸟老师给大家介绍了Java中的JPA嵌入式的概念，下面老师给大家分享Java中的JPA嵌入式的实例，希望对大家学习Java有帮助。

实例

下面的代码来自PersonDaoImpl.java。

package cn.w3cschool.common;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;

import org.springframework.transaction.annotation.Transactional;

@Transactionalpublic class PersonDaoImpl {  public void test() {
   Employee emp = new Employee();
   emp.setName("name");
   emp.setSalary(12345);
   

   Address p = new Address();
   p.setCity("New York");

   emp.setAddress(p);
   em.persist(emp);
 }

 @PersistenceContext  private EntityManager em;
}

以下代码来自Employee.java。

package cn.w3cschool.common;

import javax.persistence.Embedded;
import javax.persistence.Entity;
import javax.persistence.Id;

@Entitypublic class Employee {
   @Id private int id;    private String name;    private long salary;
   
   @Embedded
   private Address address;    
   public Employee() {}    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 long getSalary() {
       return salary;
   }    public void setSalary(long salary) {
       this.salary = salary;
   }    public Address getAddress() {
       return address;
   }    
   public void setAddress(Address address) {
       this.address = address;
   }    public String toString() {
       return "Employee id: " + getId() + " name: " + getName() +               " salary: " + getSalary() + " address: " + getAddress();
   }
}

以下代码来自Address.java。

package cn.w3cschool.common;

import javax.persistence.Access;
import javax.persistence.AccessType;
import javax.persistence.Column;
import javax.persistence.Embeddable;

@Embeddable @Access(AccessType.FIELD)public class Address {    private String street;
   private String city;
   private String state;
   @Column(name="ZIP_CODE")    private String zip;    public String getStreet() {
       return street;
   }    
   public void setStreet(String address) {
       this.street = address;
   }    public String getCity() {
       return city;
   }    public void setCity(String city) {
       this.city = city;
   }    public String getState() {
       return state;
   }    public void setState(String state) {
       this.state = state;
   }    public String getZip() {
       return zip;
   }    public void setZip(String zip) {
       this.zip = zip;
   }    public String toString() {
       return "Address street: " + getStreet() +               ", city: " + getCity() +               ", state: " + getState() +               ", zip: " + getZip();
   }

}

以下是数据库转储。

Table Name: EMPLOYEE
Row:
   Column Name: ID,
   Column Type: INTEGER:
   Column Value: 0

   Column Name: CITY,
   Column Type: VARCHAR:
   Column Value: New York

   Column Name: STATE,
   Column Type: VARCHAR:
   Column Value: null

   Column Name: STREET,
   Column Type: VARCHAR:
   Column Value: null

   Column Name: ZIP_CODE,
   Column Type: VARCHAR:
   Column Value: null

   Column Name: NAME,
   Column Type: VARCHAR:
   Column Value: name

   Column Name: SALARY,
   Column Type: BIGINT:
   Column Value: 12345

想了解更多关于Java的资讯吗？可以来惠州北大青鸟新方舟校区了解一下。

Java

标签：惠州计算机JAVA软件开发惠州计算机Java软件开发惠州计算机JAVA培训惠州计算机JAVA软件开发学校惠州计算机Java软件开发培训JAVAJava软件开发北大青鸟IT计算机学校北大青鸟IT软件学校北大青鸟IT学校