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 1272434821@qq.com* @description:自动把firstName+lastName合并为name*/
@Entity
@Table(name = "t_user")
@Access(AccessType.FIELD)
public class User {@Id@GeneratedValueprivate Long id;@Column(name = "name", unique = true)private String name;private Date birthday;@Transientprivate String firstName;@Transientprivate String lastName;@PostLoadprivate void load() {if (name != null) {String[] names = name.split(",");firstName = names[0];lastName = names[1];}}@PrePersist@PreUpdateprivate 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;}@Overridepublic 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 1272434821@qq.com* @description:自动把firstName+lastName合并为name测试*/
public class MainTest {private static EntityManagerFactory entityManagerFactory = null;private EntityManager entityManager = null;@BeforeClasspublic static void setUpBeforeClass() throws Exception {entityManagerFactory = Persistence.createEntityManagerFactory("com.jege.jpa");}@Beforepublic void setUp() throws Exception {entityManager = entityManagerFactory.createEntityManager();}@Testpublic 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();}@Afterpublic void tearDown() throws Exception {if (entityManager != null && entityManager.isOpen()) {entityManager.close();}}@AfterClasspublic 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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