JPA 菜鸟教程 18 自动把firstName+lastName合并为name字段

GitHub

需求

设计的国际化网站，页面需要输入firstName，lastName，后台数据库只需要存储name属性。
页面获取的firstName，lastName持久化到数据库name属性，规则按照，分隔保存。
防止错误修改，模型里面的name属性不提供getter，setter方法。

ddl语句

CREATE TABLE `t_user` (  `id` bigint(20) NOT NULL AUTO_INCREMENT,  `birthday` datetime DEFAULT NULL,  `name` varchar(255) DEFAULT NULL,  PRIMARY KEY (`id`)) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;

User

package com.jege.jpa.primary;import java.util.Date;import javax.persistence.Access;import javax.persistence.AccessType;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.Id;import javax.persistence.PostLoad;import javax.persistence.PrePersist;import javax.persistence.PreUpdate;import javax.persistence.Table;import javax.persistence.Transient;/** * @author JE哥 * @email [e-mail] * @description:自动把firstName+lastName合并为name */@Entity@Table(name = "t_user")@Access(AccessType.FIELD)public class User {  @Id  @GeneratedValue  private Long id;  @Column(name = "name", unique = true)  private String name;  private Date birthday;  @Transient  private String firstName;  @Transient  private String lastName;  @PostLoad  private void load() {    if (name != null) {      String[] names = name.split(",");      firstName = names[0];      lastName = names[1];    }  }  @PrePersist  @PreUpdate  private void save() {    if (firstName != null && !"".equals(firstName)) {      name = firstName + ",";    }    if (lastName != null && !"".equals(lastName)) {      name += lastName;    }  }  public Long getId() {    return id;  }  public void setId(Long id) {    this.id = id;  }  public Date getBirthday() {    return birthday;  }  public void setBirthday(Date birthday) {    this.birthday = birthday;  }  public String getFirstName() {    return firstName;  }  public void setFirstName(String firstName) {    this.firstName = firstName;  }  public String getLastName() {    return lastName;  }  public void setLastName(String lastName) {    this.lastName = lastName;  }  @Override  public String toString() {    return "User [id=" + id + ", name=" + name + ", birthday=" + birthday + ", firstName=" + firstName + ", lastName="    + lastName + "]";  }}

MainTest

package com.jege.jpa.primary;import java.util.Date;import javax.persistence.EntityManager;import javax.persistence.EntityManagerFactory;import javax.persistence.Persistence;import org.junit.After;import org.junit.AfterClass;import org.junit.Before;import org.junit.BeforeClass;import org.junit.Test;/** * @author JE哥 * @entityManagerail [e-mail] * @description:自动把firstName+lastName合并为name测试 */public class MainTest {  private static EntityManagerFactory entityManagerFactory = null;  private EntityManager entityManager = null;  @BeforeClass  public static void setUpBeforeClass() throws Exception {    entityManagerFactory = Persistence.createEntityManagerFactory("com.jege.jpa");  }  @Before  public void setUp() throws Exception {    entityManager = entityManagerFactory.createEntityManager();  }  @Test  public void persist() throws Exception {    User user = new User();    user.setBirthday(new Date());    user.setFirstName("西门");    user.setLastName("吹雪");    entityManager.getTransaction().begin();    entityManager.persist(user);    entityManager.getTransaction().commit();  }  @After  public void tearDown() throws Exception {    if (entityManager != null && entityManager.isOpen()) {      entityManager.close();    }  }  @AfterClass  public static void tearDownAfterClass() throws Exception {    if (entityManagerFactory != null && entityManagerFactory.isOpen()) {      entityManagerFactory.close();    }  }}

源码地址

https://github.com/je-ge/jpa

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