persistence.xml
<property name="hibernate.dialect" value="org.hibernate.dialect.Oracle10gDialect"></property>
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect"/>
<property name="hibernate.hbm2ddl.auto" value="update"/>
實體名不能有下劃線、主鍵不能有約束(待更進一步的考證)
測試:
EntityManagerFactory factory = Persistence.createEntityManagerFactory("xxx");//persistence-unit name="xxx"
EntityManager em = factory.createEntityManager();
//em.getTransaction().begin();
//em.persist(new User("haojy4"));
//em.getTransaction().commit();
em.close();
factory.close();