Hibernate_Jpa.java 文件源码

/**
 * Gets the emf.
 *
 * @return the emf
 */
private static EntityManagerFactory getEmf() {
    if (emf == null) {
        String persistenceUnitName = loadPersistentUnitName();
        emf = Persistence.createEntityManagerFactory(persistenceUnitName);
    }
    return emf;
}