JPA 系列教程19-jpa-uuid主键生成策略

ddl语句

CREATE TABLE `t_user` (
  `id` varchar(32) NOT NULL,
  `name` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

User

package com.jege.jpa.primary;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;

import org.hibernate.annotations.GenericGenerator;

/**
 * @author JE哥
 * @email [e-mail]
 * @description:jpa-uuid主键生成策略
 */
@Entity
@Table(name = "t_user")
@GenericGenerator(name = "jpa-uuid", strategy = "uuid")
public class User {
  @Id
  @GeneratedValue(generator = "jpa-uuid")
  @Column(length = 32)
  private String id;
  private String name;

  public String getId() {
    return id;
  }

  public void setId(String id) {
    this.id = id;
  }

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }

  @Override
  public String toString() {
    return "User [id=" + id + ", name=" + name + "]";
  }

}

MainTest

package com.jege.jpa.primary;

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:jpa-uuid主键生成测试
 */
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.setName("jege");

    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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