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j-jdo的介绍性书籍

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<a name="navskip"></a><td height="25" colspan="4"><img alt="3.使用 JDO 的简单示例" src="imagemaster/titlebar3.jpg" border="0" height="25" width="562"></td>
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<td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>构建应用程序</b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, Helvetica"><nobr>   第 11 页（共15 页）</nobr></font></td>
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<p>在以下应用程序中，我们将创建类 <code>Address</code> 的实例。该实例具有持久性之后，应用程序将退出。您会注意到程序的几个特殊部分，如下所示：</p>
<ul>
<li>JDO 设置</li>
<li>事务操作</li>
<li>对象生命周期</li>
<li>至 JDO 的持久性接口</li>
</ul>
<p>以下是应用程序代码：</p>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
package com.stereobeacon.jdo.tutorial;

import javax.jdo.PersistenceManagerFactory;
import javax.jdo.PersistenceManager;
import javax.jdo.Transaction;

public class Test1 {
    public static final String DBURL = "jdbc:mysql://localhost/jdotut";
    public static final String DBDRIVER = "org.gjt.mm.mysql.Driver";

    public static void main(String[] args) {
       try {
          /*
           * SETUP JDO
           */
          // first create and set up a persistence manager
          //	factory
          PersistenceManagerFactory pmf =
             (PersistenceManagerFactory) Class
                .forName("com.libelis.lido.PersistenceManagerFactory")
                .newInstance();
	 pmf.setConnectionURL(DBURL);
	 pmf.setConnectionDriverName(DBDRIVER);

	 // now retrieve the persistence manager associated
	 //	with the parameters setup in the factory
	 PersistenceManager pm = pmf.getPersistenceManager();

          /*
           * START A TRANSACTION
           */
          // retrieve the current transaction
	 Transaction t = pm.currentTransaction();
          // start a new transaction
	 t.begin();

          /*
           * CREATE AN OBJECT INSTANCE
           */
          AddressImpl a =
	    new AddressImpl("7700 Technology Way", "", "Denver", "CO", "80237");

          /*
           * MAKE THE OBJECT PERSISTENT
           */
	 pm.makePersistent(a);

          /*
           * COMMIT THE OBJECT TO STORAGE
           */

	 // commit the transaction, all changes made between
	 //	the begin and commit are set to the db
	 t.commit();

          /*
           * CLEANUP AND EXIT
           */
          pm.close();
        } catch (Exception e) {
          e.printStackTrace();
        }
    }
}
</code>
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