JDO 調用層：PersistenceManagerFactory.java

package com.emprogria; import javax.jdo.JDOHelper; public final class PersistenceManagerFactory { private static final javax.jdo.PersistenceManagerFactory myPersistenceManagerFactory = JDOHelper .getPersistenceManagerFactory("transactions-optional"); public PersistenceManagerFactory() { } public static javax.jdo.PersistenceManagerFactory get() { return myPersistenceManagerFactory; } }