修改PerTest.java

具体代码如下：

package junit.test;import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;import org.junit.Test;import com.sonoi.bean.Person;public class PerTest {@Testpublic void save() {EntityManagerFactory factory = Persistence.createEntityManagerFactory("unitname");EntityManager manager = factory.createEntityManager();manager.getTransaction().begin();//不能输入汉字！针对my操作系统manager.persist(new Person("nansheng"));manager.getTransaction().commit();manager.close();factory.close();}@Testpublic void find1() {EntityManagerFactory factory = Persistence.createEntityManagerFactory("unitname");EntityManager manager = factory.createEntityManager();Person person = manager.find(Person.class, 2);System.out.println(person.getName());manager.close();factory.close();}@Testpublic void find2() {EntityManagerFactory factory = Persistence.createEntityManagerFactory("unitname");EntityManager manager = factory.createEntityManager();Person person = manager.getReference(Person.class, 1);System.out.println(person.getName());manager.close();factory.close();}@Testpublic void update1() {EntityManagerFactory factory = Persistence.createEntityManagerFactory("unitname");EntityManager manager = factory.createEntityManager();manager.getTransaction().begin();Person person = manager.getReference(Person.class, 1);person.setName("bbbbbbb");manager.getTransaction().commit();manager.close();factory.close();}//此更新方法有问题@Testpublic void update2() {EntityManagerFactory factory = Persistence.createEntityManagerFactory("unitname");EntityManager manager = factory.createEntityManager();manager.getTransaction().begin();Person person = manager.getReference(Person.class, 1);//增加此句代码会出错manager.clear();
//      manager.merge(person);person.setName("hhhhhhh");manager.getTransaction().commit();manager.close();factory.close();}@Testpublic void delete() {EntityManagerFactory factory = Persistence.createEntityManagerFactory("unitname");EntityManager manager = factory.createEntityManager();manager.getTransaction().begin();Person person = manager.getReference(Person.class, 2);manager.remove(person);manager.getTransaction().commit();manager.close();factory.close();}}