JPA学习---第四节：JPA实例与JPA主键生成策略

package learn.jpa.bean;

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

@Entity
public class Person {

    @Id
    @GeneratedValue
    private Integer id;
    private String name;
    
    public Person(){}
    
    public Person(String name){
        this.name = name;
    }
    
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
}

package learn.jpa.junit.test;

import static org.junit.Assert.*;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;

import learn.jpa.bean.Person;

import org.junit.Test;

public class PersonTest {

    @Test
    public void save(){
        EntityManagerFactory factory = Persistence.createEntityManagerFactory("learn_jpa");
        EntityManager em = factory.createEntityManager();
        em.getTransaction().begin();   // 开启事务
        em.persist(new Person("hwl"));
        em.getTransaction().commit();
        em.close();
        factory.close();
    }

}