�??xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:trackback="http://madskills.com/public/xml/rss/module/trackback/" xmlns:wfw="http://wellformedweb.org/CommentAPI/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/"><channel><title>&#x6C61;&#x9999;&#x8549;&#x89C6;&#x9891;&#x5728;&#x7EBF;&#x89C2;&#x770B;&#x2C;&#x77;&#x77;&#x77;&#x2E;&#x7EFC;&#x5408;&#x2C;&#x39;&#x31;&#x4E9A;&#x6D32;&#x7CBE;&#x534E;&#x56FD;&#x4EA7;&#x7CBE;&#x534E;&#x7CBE;&#x534E;&#x6DB2;</title><link>http://www.aygfsteel.com/Jhonney/archive/2010/06/25/324503.html</link><dc:creator>Jhonney</dc:creator><author>Jhonney</author><pubDate>Fri, 25 Jun 2010 11:30:00 GMT</pubDate><guid>http://www.aygfsteel.com/Jhonney/archive/2010/06/25/324503.html</guid><wfw:comment>http://www.aygfsteel.com/Jhonney/comments/324503.html</wfw:comment><comments>http://www.aygfsteel.com/Jhonney/archive/2010/06/25/324503.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/Jhonney/comments/commentRss/324503.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/Jhonney/services/trackbacks/324503.html</trackback:ping><description><![CDATA[<p>$ sqlplus user/pass </p>
<p>SQL*Plus: Release 9.2.0.6.0 - Production on Wed Aug 2 17:38:39 2006 </p>
<p>Copyright (c) 1982, 2002, Oracle Corporation.&nbsp; All rights reserved. </p>
<p><br />
Connected to:<br />
Oracle9i Enterprise Edition Release 9.2.0.6.0 - 64bit Production<br />
With the Partitioning, OLAP and Oracle Data Mining options<br />
JServer Release 9.2.0.6.0 - Production </p>
<p>SQL&gt; select * from wwm2;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; --要更新的�?</p>
<div>TOWN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ID<br />
-------------------- ----------<br />
222&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 222<br />
111&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
ww'jj&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
llll&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1111<br />
dddd&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2222<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
dsafdf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
3435&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
ljjjjj&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 222<br />
dsafdf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111</div>
<div>TOWN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ID<br />
-------------------- ----------<br />
3435&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
ljjjjj&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 222</div>
<div><br />
SQL&gt; select * from wwm5;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; --更新的条件表</div>
<div>TOWN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ID<br />
-------------------- ----------<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
test&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 9984</div>
<div>SQL&gt; select wwm2.* from wwm2,wwm5 where wwm2.id=wwm5.id<br />
&nbsp; 2&nbsp; /</div>
<div>TOWN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ID<br />
-------------------- ----------<br />
111&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
ww'jj&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
dsafdf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
3435&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
dsafdf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
3435&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111</div>
<div>8 rows selected.</div>
<div>所�?每次需要更�?条数据就是正���的.</div>
<div>�怿��E�序员是通过以下�c�M��的SQL更新�?�q�是错误�?因�ؓ(f��)没有加WHERE<br />
SQL&gt;&nbsp; update wwm2 set wwm2.town=(select wwm5.town from wwm5 where wwm5.id=wwm2.id)<br />
&nbsp; 2&nbsp; /</div>
<div>13 rows updated.</div>
<div>SQL&gt; select * from wwm2;</div>
<div>TOWN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ID<br />
-------------------- ----------<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 222<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1111<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2222<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 222<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111</div>
<div>TOWN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ID<br />
-------------------- ----------<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 222<br />
13 rows selected.</div>
<div>可以看到13条记录被更新,�W�合条�g的更新正��?不符合条件的也更��Cؓ(f��)NULL.以下是正���的�Ҏ(gu��)��</div>
<div>�Ҏ(gu��)��一:<br />
SQL&gt; update wwm2<br />
&nbsp; 2&nbsp; set town=(select town from wwm5 where wwm5.id=wwm2.id)<br />
&nbsp; 3&nbsp; where id=(select wwm5.id from wwm5 where wwm5.id=wwm2.id)<br />
&nbsp; 4&nbsp; /</div>
<div>8 rows updated.</div>
<div>�Ҏ(gu��)���?&nbsp;&nbsp;&nbsp; 与方法一道理相同,�q�里需要掌握EXIST的相关用�?<br />
SQL&gt; update wwm2<br />
&nbsp;&nbsp; set town=(select town from wwm5 where wwm5.id=wwm2.id)<br />
&nbsp;&nbsp; where exists (select 1 from wwm5 where wwm5.id=wwm2.id)<br />
8 rows updated.</div>
<div>�Ҏ(gu��)���?<br />
SQL&gt; update (select a.town atown,a.id aid,b.town btown,b.id bid from wwm2 a,wwm5 b where a.id=b.id)<br />
&nbsp; 2&nbsp; set atown=btown<br />
&nbsp; 3&nbsp; /<br />
set atown=btown<br />
&nbsp;&nbsp;&nbsp; *<br />
ERROR at line 2:<br />
ORA-01779: cannot modify a column which maps to a non key-preserved table</div>
<div>&nbsp; 1* alter table wwm5 add primary key (id)<br />
SQL&gt; /</div>
<div>Table altered.</div>
<div>&nbsp; 1&nbsp; update (select a.town atown,a.id aid,b.town btown,b.id bid from wwm2 a,wwm5 b where a.id=b.id)<br />
&nbsp; 2*&nbsp; set atown=btown<br />
SQL&gt; /</div>
<div>8 rows updated.</div>
<div>�q�种�Ҏ(gu��)��的局限性就是需要PRIMARY 的支�?</div>
<div>�Ҏ(gu��)���?<br />
&nbsp; 1&nbsp; declare<br />
&nbsp; 2&nbsp; cursor cur_wwm is select town,id from wwm5;<br />
&nbsp; 3&nbsp; begin<br />
&nbsp; 4&nbsp;&nbsp;&nbsp;&nbsp; for my_wwm in cur_wwm loop<br />
&nbsp; 5&nbsp;&nbsp;&nbsp;&nbsp; update wwm2 set town=my_wwm.town<br />
&nbsp; 6&nbsp;&nbsp;&nbsp;&nbsp; where id=my_wwm.id;<br />
&nbsp; 7&nbsp;&nbsp;&nbsp;&nbsp; end loop;<br />
&nbsp; 8* end;<br />
SQL&gt; /</div>
<div>PL/SQL procedure successfully completed.</div>
<div>SQL&gt; select * from wwm2;</div>
<div>TOWN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ID<br />
-------------------- ----------<br />
222&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 222<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
llll&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1111<br />
dddd&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2222<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
ljjjjj&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 222<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111</div>
<div>TOWN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ID<br />
-------------------- ----------<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
ljjjjj&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 222</div>
<div>�q�个�Ҏ(gu��)��是最灉|��的了(ji��n).</div>
<div>�Ҏ(gu��)���?</div>
<div>注意,�Ҏ(gu��)��五只能适用于WWM5是WWM2的子集的时�?<br />
&nbsp; 1&nbsp;&nbsp; merge into wwm2<br />
&nbsp; 2&nbsp;&nbsp; using (select town,id from wwm5) b<br />
&nbsp; 3&nbsp;&nbsp; on (wwm2.id=b.id)<br />
&nbsp; 4&nbsp;&nbsp; when matched then update set town=b.town<br />
&nbsp; 5* when not matched then insert (town,id) values (null,null)<br />
SQL&gt; /</div>
<div>9 rows merged.</div>
<div>SQL&gt; select * from wwm2;</div>
<div>TOWN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ID<br />
-------------------- ----------<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ---注意�q�个地方,被插入了(ji��n)一个空�?因�ؓ(f��)WWM5的ID=9984在WWM2中不能匹�?�Ҏ(gu��)��原因是ORACLE9必须有WHEN NOT MATCHED子句,但是ORACLE10可以不许�?也就是ORACLE10可以不写WHEN NOT MATCHED ,��׃��必插入NULL��g��(ji��n),�����册���个问�?下一步会(x��)DELETE WWM5的ID=9984,�q�样一来就不会(x��)执行W(xu��)HEN NOT MATCHED<br />
222&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 222<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
llll&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1111<br />
dddd&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2222<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
ljjjjj&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 222</div>
<div>TOWN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ID<br />
-------------------- ----------<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
ljjjjj&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 222</div>
<div>14 rows selected.</div>
<div>SQL&gt; delete from wwm5 where id=9984;</div>
<div>1 row deleted.</div>
<div>SQL&gt;&nbsp; 1&nbsp;&nbsp; merge into wwm2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br />
SQL&gt;&nbsp;&nbsp; 2&nbsp;&nbsp; using (select town,id from wwm5) b<br />
SQL&gt;&nbsp;&nbsp; 3&nbsp;&nbsp; on (wwm2.id=b.id)<br />
SQL&gt;&nbsp;&nbsp; 4&nbsp;&nbsp; when matched then update set town=b.town<br />
SQL&gt;&nbsp;&nbsp; 5* when not matched then insert (town,id) values (null,null)<br />
SQL&gt; /</div>
<div>8 rows merged.</div>
<div>&nbsp;</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 以上���是5�U�关�q�更新的例子�?希望能给开发�h员解�?</div>
<div>&nbsp;</div>
<div><strong>说明�Q�如果select 子句可以�q�回多行记录�Q�但�q�回适合where条�g的记录只能是唯一的，否则���会(x��)报返回单行的select子句�q�回多行的错误，因�ؓ(f��)update只能跟据此处的where子句�Q�内层where)�q�行相应记录的匹配更斎ͼ�一�ơ只能是一条�?/strong></div>
<img src ="http://www.aygfsteel.com/Jhonney/aggbug/324503.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/Jhonney/" target="_blank">Jhonney</a> 2010-06-25 19:30 <a href="http://www.aygfsteel.com/Jhonney/archive/2010/06/25/324503.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>【原创】自己写的一个分��늨��?/title><link>http://www.aygfsteel.com/Jhonney/archive/2008/04/26/196108.html</link><dc:creator>Jhonney</dc:creator><author>Jhonney</author><pubDate>Fri, 25 Apr 2008 16:48:00 GMT</pubDate><guid>http://www.aygfsteel.com/Jhonney/archive/2008/04/26/196108.html</guid><wfw:comment>http://www.aygfsteel.com/Jhonney/comments/196108.html</wfw:comment><comments>http://www.aygfsteel.com/Jhonney/archive/2008/04/26/196108.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/Jhonney/comments/commentRss/196108.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/Jhonney/services/trackbacks/196108.html</trackback:ping><description><![CDATA[<p>�q�初时帮朋友写了(ji��n)分页�E�序�Q�主要由于考虑��C��的应用数据量很大<br />
�E�序元旦时已完成�Q�也懒得发出�?br />
大体思想�Q�分��늚�核心(j��)思想采用Iterator模式�Q�每�ơ从数据库中取定量的数据�?br />
其中block和pageCount是两个不同的概念�Q�block是块�Q�规定了(ji��n)从数据库中获取的数量<br />
pageCount�����现层每页昄���的数�?br />
另外参数中还包含�~�存的时间的讄���<br />
�E�序分核�?j��)jar包和���试包，���试包以SPring为基���框架<br />
http://www.chinadforce.com/viewthread.php?tid=878261&amp;extra=page%3D4<br />
</p>
<img src ="http://www.aygfsteel.com/Jhonney/aggbug/196108.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/Jhonney/" target="_blank">Jhonney</a> 2008-04-26 00:48 <a href="http://www.aygfsteel.com/Jhonney/archive/2008/04/26/196108.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>classloader�ȝ��</title><link>http://www.aygfsteel.com/Jhonney/archive/2008/04/04/190798.html</link><dc:creator>Jhonney</dc:creator><author>Jhonney</author><pubDate>Fri, 04 Apr 2008 08:45:00 GMT</pubDate><guid>http://www.aygfsteel.com/Jhonney/archive/2008/04/04/190798.html</guid><wfw:comment>http://www.aygfsteel.com/Jhonney/comments/190798.html</wfw:comment><comments>http://www.aygfsteel.com/Jhonney/archive/2008/04/04/190798.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/Jhonney/comments/commentRss/190798.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/Jhonney/services/trackbacks/190798.html</trackback:ping><description><![CDATA[��目旉���要对外提供一些服务接口，写了(ji��n)接口�?qi��ng)其实现发现报castClassException�Q�当时newInstance旉����?br />
Thread.currentContext.getClassLoader的�Ş式，分析�?ji��n)一下发现��^台采用了(ji��n)自己的classloader<br />
<br />
1.java的classloader采用双亲委托的机�?br />
2.当前�c�d��载器和线�E�上下文的区别是�Q�当前类加蝲器在加蝲caller�c�L��已经���定�Q�但thread's context classloader is modifiable<br />
3.thread's classloader can break through the parent delegation mechanism of classloader<br />
4.it is should keep the thread's classloader same as current class classloader<br />
5.the default form of class.forname isn't recommend,because of exception of initializing static field if the classloader is not<br />
destroied<br />
6.banq comment about adoption thread's&nbsp; classloader is not correctly<br />
<br />
<img src ="http://www.aygfsteel.com/Jhonney/aggbug/190798.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/Jhonney/" target="_blank">Jhonney</a> 2008-04-04 16:45 <a href="http://www.aygfsteel.com/Jhonney/archive/2008/04/04/190798.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>走出ClassLoader�q�宫</title><link>http://www.aygfsteel.com/Jhonney/archive/2008/03/23/187966.html</link><dc:creator>Jhonney</dc:creator><author>Jhonney</author><pubDate>Sat, 22 Mar 2008 18:57:00 GMT</pubDate><guid>http://www.aygfsteel.com/Jhonney/archive/2008/03/23/187966.html</guid><wfw:comment>http://www.aygfsteel.com/Jhonney/comments/187966.html</wfw:comment><comments>http://www.aygfsteel.com/Jhonney/archive/2008/03/23/187966.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/Jhonney/comments/commentRss/187966.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/Jhonney/services/trackbacks/187966.html</trackback:ping><description><![CDATA[<span style="font-family: �?hu��)�?">quto:http://www.aygfsteel.com/lihuaxajh/articles/94371.html<br />
other resources:<br />
&nbsp;&nbsp;&nbsp; 1.http://www.javaworld.com/javaworld/javaqa/2003-06/01-qa-0606-load.html?page=1<br />
&nbsp;&nbsp;&nbsp; 2.http://www.javaworld.com/javaworld/javaqa/2003-06/01-qa-0606-load.html?page=2&nbsp;&nbsp;  <br />
&nbsp;&nbsp;&nbsp; 3.http://www.javaworld.com/javaworld/javaqa/2003-03/01-qa-0314-forname.html<br />
&nbsp;&nbsp;&nbsp; 4.http://www.theserverside.com/news/thread.tss?thread_id=40763<br />
&nbsp;&nbsp;&nbsp; 5.http://www.matrix.org.cn/resource/article/43/43875_Class_Loading.html<br />
&nbsp;&nbsp;&nbsp; 6.http://blog.sina.com.cn/s/blog_4b6047bc0100096v.html<br />
&nbsp;&nbsp;&nbsp; 7.http://blog.sina.com.cn/s/blog_4b6047bc0100097p.html<br />
�q�个问题�l�常出现在编写框架代�?/span>
<span lang="EN-US">, </span>
<span style="font-family: �?hu��)�?">需要动态加载很多类和资源的时�?/span>
<span lang="EN-US">. </span>
<span style="font-family: �?hu��)�?">通常当你需要动态加载资源的时�?/span>
<span lang="EN-US">, </span>
<span style="font-family: �?hu��)�?">你至���有三个</span>
<span lang="EN-US">ClassLoader</span>
<span style="font-family: �?hu��)�?">可以选择</span>
<span lang="EN-US">: </span>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt 42pt; text-indent: -21pt; line-height: 150%;">
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt 42pt; text-indent: -21pt; line-height: 150%;">
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt 42pt; text-indent: -21pt; line-height: 150%;">
</p>
<ol>
    <li><span style="font-family: Wingdings;" lang="EN-US">
    <span><span style="font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">&nbsp; </span></span></span><span style="font-family: �?hu��)�?">�pȝ���c�d��载器或叫作应用类加蝲�?/span>
    <span style="font-family: Wingdings;" lang="EN-US">(system classloader or application classloader)</span></li>
    <li><span style="font-family: Wingdings;" lang="EN-US"><span><span style="font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">&nbsp;</span></span></span><span style="font-family: �?hu��)�?">当前�c�d��载器</span><span style="font-family: Wingdings;" lang="EN-US"></span></li>
    <li><span style="font-family: Wingdings;" lang="EN-US"><span><span style="font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">&nbsp;</span></span></span><span style="font-family: �?hu��)�?">当前�U�程�c�d��载器</span></li>
</ol>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt 42pt; text-indent: -21pt; line-height: 150%;">
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt 42pt; text-indent: -21pt; line-height: 150%;">
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: 150%;">
<span style="font-family: �?hu��)�?">上面的问题指的是最后一�U�类加蝲�?/span>
<span lang="EN-US">. </span>
<span style="font-family: �?hu��)�?">哪种�c�d��载器是正���的选择�?/span>
<span lang="EN-US">?</span>
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; text-indent: 21pt; line-height: 150%;">
<span style="font-family: �?hu��)�?">�W�一�U�选择可以很容易地排除</span>
<span lang="EN-US">: </span>
<span style="font-family: �?hu��)�?">�pȝ���c�d��载器</span>
<span lang="EN-US">(system classloader). </span>
<span style="font-family: �?hu��)�?">�q�个�c�d��载器处理</span>
<span lang="EN-US">-classpath</span>
<span style="font-family: �?hu��)�?">下的�c�d��载工�?/span>
<span lang="EN-US">, </span>
<span style="font-family: �?hu��)�?">可以通过</span>
<span lang="EN-US">ClassLoader.getSystemClassLoader()</span>
<span style="font-family: �?hu��)�?">�Ҏ(gu��)��调用</span>
<span lang="EN-US">. ClassLoader</span>
<span style="font-family: �?hu��)�?">下所有的</span>
<span lang="EN-US">getSystemXXX()</span>
<span style="font-family: �?hu��)�?">的静(r��n)态方法都是通过�q�个�Ҏ(gu��)��定义�?/span>
<span lang="EN-US">. </span>
<span style="font-family: �?hu��)�?">在你的代码中</span>
<span lang="EN-US">, </span>
<span style="font-family: �?hu��)�?">你应该尽量少地调用这个方�?/span>
<span lang="EN-US">,</span>
<span style="font-family: �?hu��)�?">以其它的�c�d��载器作�ؓ(f��)代理</span>
<span lang="EN-US">. </span>
<span style="font-family: �?hu��)�?">否则你的代码���只能工作在���单的命��o(h��)行应用中</span>
<span lang="EN-US">, </span>
<span style="font-family: �?hu��)�?">�q�个时候系�l�类加蝲�?/span>
<span lang="EN-US">(system classloader)</span>
<span style="font-family: �?hu��)�?">�?/span>
<span lang="EN-US">JVM</span>
<span style="font-family: �?hu��)�?">最后创建的�c�d��载器</span>
<span lang="EN-US">. </span>
<span style="font-family: �?hu��)�?">一但你把代码移�?/span>
<span lang="EN-US">EJB, Web</span>
<span style="font-family: �?hu��)�?">应用�?/span>
<span lang="EN-US">Java Web Start</span>
<span style="font-family: �?hu��)�?">应用�?/span>
<span lang="EN-US">, </span>
<span style="font-family: �?hu��)�?">一定会(x��)出问�?/span>
<span lang="EN-US">. </span>
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: 150%;">
<span lang="EN-US">
<span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>
</span>
<span style="font-family: �?hu��)�?">所以我们来看第二种选择</span>
<span lang="EN-US">: </span>
<span style="font-family: �?hu��)�?">当前上下文环境下的类加蝲�?/span>
<span lang="EN-US">. </span>
<span style="font-family: �?hu��)�?">�Ҏ(gu��)��定义</span>
<span lang="EN-US">, </span>
<span style="font-family: �?hu��)�?">当前�c�d��载器���是你当前方法所属的�cȝ��加蝲�?/span>
<span lang="EN-US">. </span>
<span style="font-family: �?hu��)�?">在运行时�c�M��间动态联�~?/span>
<span lang="EN-US">, </span>
<span style="font-family: �?hu��)�?">�?qi��ng)调�?/span>
<span lang="EN-US">Class.forName,() Class.getResource()</span>
<span style="font-family: �?hu��)�?">�{�类似方法时</span>
<span lang="EN-US">, </span>
<span style="font-family: �?hu��)�?">�q�个�c�d��载器�?x��)被隐含��C���?/span>
<span lang="EN-US">. </span>
<span style="color: #ffcc00; font-family: �?hu��)�?" lang="EN-US">It is also used by syntactic constructs like X.class class literals.</span>
<span style="font-family: �?hu��)�?" lang="EN-US">
<o:p>
</o:p>
</span>
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: 150%;">
<span style="font-family: �?hu��)�?" lang="EN-US">
<span>&nbsp;&nbsp;&nbsp; </span>
</span>
<span style="font-family: �?hu��)�?">�U�程上下文类型加载器是在<span lang="EN-US">Java 2</span>�q�_��上被引入�?span lang="EN-US">. </span>每一个线�E�都有一个类加蝲器与之对�?span lang="EN-US">(</span>除非�q�个�U�程是被本地代码创徏�?span lang="EN-US">). </span>�q�个�c�d��载器是通过<span lang="EN-US">Thread.setContextClassLoaser()</span>�Ҏ(gu��)��讄����?span lang="EN-US">. </span>如果你不在线�E�构造后调用�q�个�Ҏ(gu��)��<span lang="EN-US">, </span>�q�个�U�程���从它的父线�E�中�l�承相应的上下文�c�d��载器<span lang="EN-US">. </span>如果在整个应用中你不做�Q何特�D�设�|?span lang="EN-US">, </span>所有的�U�程���都以系�l�类加蝲�?span lang="EN-US">(system classloader)</span>作�ؓ(f��)自己的线�E�上下文�c�d��载器<span lang="EN-US">. </span>自从<span lang="EN-US">Web</span>�?span lang="EN-US">J2EE</span>应用服务器��用成熟的�c�d��载器机制来实现诸�?span lang="EN-US">JNDI, </span>�U�程�?span lang="EN-US">, </span>�l��g热部�|�等功能以来<span lang="EN-US">, </span>�q�种在整个应用中不做��M���U�程�c�d��载器讄���的情况就很少�?span lang="EN-US">.<o:p></o:p></span></span>
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: 150%;">
<span style="font-family: �?hu��)�?" lang="EN-US">
<span>&nbsp;&nbsp;&nbsp; </span>
</span>
<span style="font-family: �?hu��)�?">��Z��么线�E�上下文�c�d��载器存在于如此重要的位置�?span lang="EN-US">? </span>�q�个概念�?span lang="EN-US">J2SE</span>中的引入�q�不引�h注目<span lang="EN-US">. </span>很多开发�h员对�q�一概念�q�h��的原因是<span lang="EN-US">Sun</span>公司在这斚w���~�Z��适当的指引和文���<span lang="EN-US">. <o:p></o:p></span></span>
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: 150%;">
<span style="font-family: �?hu��)�?" lang="EN-US">
<span>&nbsp;&nbsp;&nbsp; </span>
</span>
<span style="font-family: �?hu��)�?">事实�?span lang="EN-US">, </span>上下文类加蝲器提供了(ji��n)�c�d��载机制的后门<span lang="EN-US">, </span>�q�一点也�?span lang="EN-US">J2SE</span>中被引入�?span lang="EN-US">. </span>通常<span lang="EN-US">, </span>�?span lang="EN-US">JVM</span>中的所有类加蝲器被�l�织成了(ji��n)有��承层�ơ的�l�构<span lang="EN-US">, </span>每一个类加蝲�?span lang="EN-US">(</span>除了(ji��n)引导<span lang="EN-US">JVM</span>的原始类加蝲�?span lang="EN-US">)</span>都有一个父加蝲�?span lang="EN-US">. </span>每当被请�C�加载类�?span lang="EN-US">, </span>�c�d��载器都会(x��)首先��h��其父�c�d��载器<span lang="EN-US">, </span>只有当父�c�d��载器不能加蝲�?span lang="EN-US">, </span>才会(x��)自己�q�行�c�d���?span lang="EN-US">.<o:p></o:p></span></span>
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: 150%;">
<span style="font-family: �?hu��)�?" lang="EN-US">
<span>&nbsp;&nbsp; </span>
</span>
<span style="font-family: �?hu��)�?">有时候这�U�类加蝲的顺序安排不能正常工�?span lang="EN-US">, (<font color="#3300cc">�?
处的意思是:正常情况下都是从子类加蝲器到根类加蝲器请�?万一有根�c�里需要加载子�c�L��,�q�种��序��׃��能满�������?���p��有一条反向的通道,卛_��到子�c�d���?
�?�q�样���q����C��(ji��n)thread context
classloader,因�ؓ(f��)通过thread.getcontextclassloader()可以得到子类加蝲�?/font>).</span>通常当必���d��态加载应用程序开发�h员提供的资源的时�?span lang="EN-US">. </span>�?span lang="EN-US">JNDI</span>��Z��<span lang="EN-US">: </span>它的内容<span lang="EN-US">(</span>�?span lang="EN-US">J2SE1.3</span>开�?span lang="EN-US">)</span>���在<span lang="EN-US">rt.jar</span>中的引导�c�M��实现�?span lang="EN-US">, </span>但是�q�些<span lang="EN-US">JNDI</span>核心(j��)�c�需要动态加载由独立厂商实现�q�����|�在应用�E�序�?span lang="EN-US">classpath</span>下的<span lang="EN-US">JNDI</span>提供�?span lang="EN-US">. </span>�q�种情况���p��求一个父<span lang="EN-US">classloader(</span>本例<span lang="EN-US">, </span>���是引导�c�d��载器<span lang="EN-US">)</span>��d��载对于它其中一个子<span lang="EN-US">classloader(</span>本例<span lang="EN-US">, </span>�pȝ���c�d��载器<span lang="EN-US">)</span>可见的类<span lang="EN-US">. </span>�q�时通常的类加蝲代理机制不能实现�q�个要求<span lang="EN-US">. </span>解决的办�?span lang="EN-US">(workaround)</span>���是<span lang="EN-US">, </span>�?span lang="EN-US">JNDI</span>核心(j��)�c�M��用当前线�E�上下文的类加蝲�?span lang="EN-US">, </span>�q�样<span lang="EN-US">, </span>���基本的�c�d��载代理机制的相反方向建立�?ji��n)一条有效的途径<span lang="EN-US">. <o:p></o:p></span></span>
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: 150%;">
<span style="font-family: �?hu��)�?" lang="EN-US">
<span>&nbsp;&nbsp;&nbsp; </span>
</span>
<span style="font-family: �?hu��)�?">另外<span lang="EN-US">, </span>上面一�D�可能让你想起一些其它的事情<span lang="EN-US">: XML</span>解析<span lang="EN-US">Java API(JAXP). </span>是的<span lang="EN-US">, </span>�?span lang="EN-US">JAXP</span>只是<span lang="EN-US">J2SE</span>的扩展进<span lang="EN-US">, </span>它很自然地用当前�c�d��载器来引��D��析器的实�?span lang="EN-US">. </span>而当<span lang="EN-US">JAXP</span>被加入到<span lang="EN-US">J2SE1.4</span>的核�?j��)类库中�?span lang="EN-US">, </span>它的�c�d��载也���改成了(ji��n)用当前线�E�类加蝲�?span lang="EN-US">, </span>�?span lang="EN-US">JNDI</span>的情况完全类�?span lang="EN-US">(</span>也��很多�E�序员很�q�h��<span lang="EN-US">). </span>明白��Z��么我说来�?span lang="EN-US">Sun</span>的指导很�~�Z���?ji��n)�?span lang="EN-US">?<o:p></o:p></span></span>
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: 150%;">
<span style="font-family: �?hu��)�?" lang="EN-US">
<span>&nbsp;&nbsp; </span>
</span>
<span style="font-family: �?hu��)�?">在以上的介绍之后<span lang="EN-US">, </span>我们来看关键问题<span lang="EN-US">: </span>�q�两�U�选择<span lang="EN-US">(</span>当前�c�d��载器和当前线�E�类加蝲�?span lang="EN-US">)</span>都不是在所有环境下都适用<span lang="EN-US">. </span>有些�����为当前线�E�类加蝲器应该成为新的标准策�?span lang="EN-US">. </span>但是<span lang="EN-US">, </span>如果�q�样<span lang="EN-US">, </span>当多个线�E�通过�׃�n数据�q�行交互的时<span lang="EN-US">, </span>���会(x��)呈现��Z���q�极其复杂的�c�d��载的画面<span lang="EN-US">, </span>除非它们全部使用�?ji��n)同一个上下文的类加蝲�?span lang="EN-US">. </span>�q�一步说<span lang="EN-US">, </span>在某些遗留下来的解决�Ҏ(gu��)���?span lang="EN-US">, </span>委派到当前类加蝲器的�Ҏ(gu��)��已经是标�?span lang="EN-US">. </span>比如�?span lang="EN-US">Class.forName(String)</span>的直接调�?span lang="EN-US">(</span>�q�也是我��Z��么推荐尽量避免对�q�个�Ҏ(gu��)���q�行调用的原�?span lang="EN-US">). </span>即��你努力去只调用上下文相关的类加蝲�?span lang="EN-US">, </span>仍然�?x��)有一些代码会(x��)不由你控�?span lang="EN-US">. </span>�q�种不受控制的类加蝲委派机制是�؜入是很危险的<span lang="EN-US">. <o:p></o:p></span></span>
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: 150%;">
<span style="font-family: �?hu��)�?" lang="EN-US">
<span>&nbsp;&nbsp;&nbsp; </span>
</span>
<span style="font-family: �?hu��)�?">更严重的问题<span lang="EN-US">, </span>某些应用服务器把环境上下文及(qi��ng)当前�c�d��载器讄�����C��同的�c�d��载器实例�?span lang="EN-US">, </span>而这些类加蝲器有相同的类路径但却没有委派机制中的父子关系<span lang="EN-US">. </span>��x(ch��ng)���q��ؓ(f��)什么十分可�?span lang="EN-US">. </span>要知道类加蝲器定义�ƈ加蝲的类实例�?x��)带有一�?span lang="EN-US">JVM</span>内部�?span lang="EN-US">ID</span>�?span lang="EN-US">. </span>如果当前�c�d��载器加蝲一个类<span lang="EN-US">X</span>的实�?span lang="EN-US">, </span>�q�个实例调用<span lang="EN-US">JNDI</span>查找�c?span lang="EN-US">Y</span>的实�?span lang="EN-US">, </span>些时的上下文的类加蝲器也可以定义�?ji��n)加载�?span lang="EN-US">Y</span>实例<span lang="EN-US">. </span>�q�个�c?span lang="EN-US">Y</span>的定义就与当前类加蝲器看到的�c?span lang="EN-US">Y</span>的定义不�?span lang="EN-US">. </span>如果�q�行强制�c�d��转换<span lang="EN-US">, </span>则��生异�?span lang="EN-US">. <o:p></o:p></span></span>
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: 150%;">
<span style="font-family: �?hu��)�?" lang="EN-US">
<span>&nbsp;&nbsp; </span>
</span>
<span style="font-family: �?hu��)�?">�q�种混�ؕ的情况还���在<span lang="EN-US">Java</span>中存在一�D�|���?span lang="EN-US">. </span>对于那些需要动态加载资源的<span lang="EN-US">J2SE</span>�?span lang="EN-US">API, </span>我们来猜惛_��们的�c�d���{�略<span lang="EN-US">. </span>例如<span lang="EN-US">:<o:p></o:p></span></span>
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt 42pt; text-indent: -21pt; line-height: 150%;">
<span style="font-family: Wingdings;" lang="EN-US">
<span>&#216;<span style="font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span>
</span>
<span style="font-family: �?hu��)�?" lang="EN-US">JNDI</span>
<span style="font-family: �?hu��)�?">使用�U�程上下文类加蝲�?span lang="EN-US"><o:p></o:p></span></span>
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt 42pt; text-indent: -21pt; line-height: 150%;">
<span style="font-family: Wingdings;" lang="EN-US">
<span>&#216;<span style="font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span>
</span>
<span style="font-family: �?hu��)�?" lang="EN-US">Class.getResource()</span>
<span style="font-family: �?hu��)�?">�?span lang="EN-US">Class.forName()</span>使用当前�c�d��载器<span lang="EN-US"><o:p></o:p></span></span>
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt 42pt; text-indent: -21pt; line-height: 150%;">
<span style="font-family: Wingdings;" lang="EN-US">
<span>&#216;<span style="font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span>
</span>
<span style="font-family: �?hu��)�?" lang="EN-US">JAXP(J2SE 1.4</span>
<span style="font-family: �?hu��)�?">�?qi��ng)之�?span lang="EN-US">)</span>使用�U�程上下文类加蝲�?span lang="EN-US"><o:p></o:p></span></span>
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt 42pt; text-indent: -21pt; line-height: 150%;">
<span style="font-family: Wingdings;" lang="EN-US">
<span>&#216;<span style="font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span>
</span>
<span style="font-family: �?hu��)�?" lang="EN-US">java.util.ResourceBundle</span>
<span style="font-family: �?hu��)�?">使用调用者的当前�c�d��载器<span lang="EN-US"><o:p></o:p></span></span>
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt 42pt; text-indent: -21pt; line-height: 150%;">
<span style="color: #ffcc00; font-family: Wingdings;" lang="EN-US">
<span>&#216;<span style="font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span>
</span>
<span style="color: #ffcc00; font-family: �?hu��)�?" lang="EN-US">URL
protocol handlers specified via java.protocol.handler.pkgs system
property are looked up in the bootstrap and system classloaders only<o:p></o:p></span>
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt 42pt; text-indent: -21pt; line-height: 150%;">
<span style="font-family: Wingdings;" lang="EN-US">
<span>&#216;<span style="font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span>
</span>
<span style="font-family: �?hu��)�?" lang="EN-US">Java</span>
<span style="font-family: �?hu��)�?">序列�?span lang="EN-US">API</span>默认使用调用者当前的�c�d��载器<span lang="EN-US"><o:p></o:p></span></span>
</p>
<span style="font-family: �?hu��)�?">�q�些�c�d��(qi��ng)资源的加载策略问�?span lang="EN-US">, </span>肯定�?span lang="EN-US">J2SE</span>领域中文���最�?qi��ng)说明最�~�Z��的部分了(ji��n)<span lang="EN-US">.</span></span>
<img src ="http://www.aygfsteel.com/Jhonney/aggbug/187966.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/Jhonney/" target="_blank">Jhonney</a> 2008-03-23 02:57 <a href="http://www.aygfsteel.com/Jhonney/archive/2008/03/23/187966.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>classloader</title><link>http://www.aygfsteel.com/Jhonney/archive/2008/03/23/187959.html</link><dc:creator>Jhonney</dc:creator><author>Jhonney</author><pubDate>Sat, 22 Mar 2008 16:19:00 GMT</pubDate><guid>http://www.aygfsteel.com/Jhonney/archive/2008/03/23/187959.html</guid><wfw:comment>http://www.aygfsteel.com/Jhonney/comments/187959.html</wfw:comment><comments>http://www.aygfsteel.com/Jhonney/archive/2008/03/23/187959.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/Jhonney/comments/commentRss/187959.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/Jhonney/services/trackbacks/187959.html</trackback:ping><description><![CDATA[classloader 和class.forname的区�?br />
��目中，发生�?ji��n)classcast异常�Q�源码处写的是Thread.currentThread<span id="wmqeeuq"    class="tpc_content">.getContextClassLoader<br />
后来�Ҏ(gu��)��class.forname后OK�?br />
</span>
<div style="border: 1px solid #cccccc; padding: 4px 5px 4px 4px; background-color: #eeeeee; font-size: 13px; width: 98%;"><!--<br />
<br />
Code highlighting produced by Actipro CodeHighlighter (freeware)<br />
http://www.CodeHighlighter.com/<br />
<br />
--><span style="color: #000000;">Class.forName(String&nbsp;clz);<br />
使用调用�q�个语句的对象所使用的ClassLoader作�ؓ(f��)ClassLoader(</span><span style="color: #000000;">1</span><span style="color: #000000;">)�?br />
<br />
Thread.currentThread().getContextClassLoader())<br />
�q�回当前�U�程使用的ClassLoader(</span><span style="color: #000000;">2</span><span style="color: #000000;">)�?br />
<br />
<br />
如果ClassLoader(</span><span style="color: #000000;">1</span><span style="color: #000000;">)&#8220;�{�于&#8221;ClassLoader(</span><span style="color: #000000;">2</span><span style="color: #000000;">)�Q�那么这里的使用Class.forName(String&nbsp;clz)和ClassLoader(</span><span style="color: #000000;">2</span><span style="color: #000000;">).loadClass(String&nbsp;clz)���是�{��h(hu��n)的�?br />
<br />
如果ClassLoader(</span><span style="color: #000000;">1</span><span style="color: #000000;">)&#8220;不等�?#8221;ClassLoader(</span><span style="color: #000000;">2</span><span style="color: #000000;">)�Q�那么就是不�{��h(hu��n)的�?br />
<br />
在框架代码中�Q�实际情冉|��ClassLoader(</span><span style="color: #000000;">1</span><span style="color: #000000;">)往往&#8220;不等�?#8221;ClassLoader(</span><span style="color: #000000;">2</span><span style="color: #000000;">)�Q?br />
卌���用Class.forName(String&nbsp;clz)的语句所在的�cȝ��装蝲器不一定就是当前线�E���用的�c�装载器�?br />
因�ؓ(f��)�Q�一个类装蝲完了(ji��n)在运行了(ji��n)�Q�该�cȝ��所属的�c�装载器���q��定了(ji��n)(不变)�Q�而在�E�序�q�行之中�Q�线�E?br />
的类装蝲器都随时可以通过hread.currentThread().setContextClassLoader(loader)�q�行改变(�?�?/span></div>
�E�序中出现的错误�Q�可能是�׃���q�_��的classloader是另一套机�?br />
<img src ="http://www.aygfsteel.com/Jhonney/aggbug/187959.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/Jhonney/" target="_blank">Jhonney</a> 2008-03-23 00:19 <a href="http://www.aygfsteel.com/Jhonney/archive/2008/03/23/187959.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>一片比较不错的单例双检�?/title><link>http://www.aygfsteel.com/Jhonney/archive/2008/03/13/186155.html</link><dc:creator>Jhonney</dc:creator><author>Jhonney</author><pubDate>Thu, 13 Mar 2008 14:43:00 GMT</pubDate><guid>http://www.aygfsteel.com/Jhonney/archive/2008/03/13/186155.html</guid><wfw:comment>http://www.aygfsteel.com/Jhonney/comments/186155.html</wfw:comment><comments>http://www.aygfsteel.com/Jhonney/archive/2008/03/13/186155.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/Jhonney/comments/commentRss/186155.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/Jhonney/services/trackbacks/186155.html</trackback:ping><description><![CDATA[&nbsp;&nbsp;&nbsp;&nbsp; 摘要: quto:http://www.ibm.com/developerworks/java/library/j-dcl.html?dwzone=java
                        A comprehensive look at this broken programming idiom
                        
                   ...&nbsp;&nbsp;<a href='http://www.aygfsteel.com/Jhonney/archive/2008/03/13/186155.html'>阅读全文</a><img src ="http://www.aygfsteel.com/Jhonney/aggbug/186155.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/Jhonney/" target="_blank">Jhonney</a> 2008-03-13 22:43 <a href="http://www.aygfsteel.com/Jhonney/archive/2008/03/13/186155.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>DELL XP Pro 来源 �?MD5</title><link>http://www.aygfsteel.com/Jhonney/archive/2007/12/02/164667.html</link><dc:creator>Jhonney</dc:creator><author>Jhonney</author><pubDate>Sun, 02 Dec 2007 09:47:00 GMT</pubDate><guid>http://www.aygfsteel.com/Jhonney/archive/2007/12/02/164667.html</guid><wfw:comment>http://www.aygfsteel.com/Jhonney/comments/164667.html</wfw:comment><comments>http://www.aygfsteel.com/Jhonney/archive/2007/12/02/164667.html#Feedback</comments><slash:comments>1</slash:comments><wfw:commentRss>http://www.aygfsteel.com/Jhonney/comments/commentRss/164667.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/Jhonney/services/trackbacks/164667.html</trackback:ping><description><![CDATA[<p>MD5�Q?7505544DB716B451DB6CC33F1ABC0E3<br />
2005N<br />
原始攑և�2006.07世纪时代论坛</p>
<p>&nbsp;</p>
<p>MD5�Q?6c029d7c10bfb1b9ce1c7034d882a21<br />
2004N<br />
原始攑և�ISO�Q?004.09&nbsp;&nbsp; 西安交大XXX</p>
<p><br />
md5�Q?2c244a48e70b80c6baa014ca33b68ed<br />
2006N<br />
原始攑և�2006.10�?sh��)骡一友：(x��)Bxx xxxxx</p>
<p><br />
MD5�Q�e38f4e392a7798aao15fa95c50ff573d<br />
和MD5�Q?7505544DB716B451DB6CC33F1ABC0E3<br />
是同一批盘�?/p>
<img src ="http://www.aygfsteel.com/Jhonney/aggbug/164667.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/Jhonney/" target="_blank">Jhonney</a> 2007-12-02 17:47 <a href="http://www.aygfsteel.com/Jhonney/archive/2007/12/02/164667.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>Dell OEM XP SP2的原版镜�?/title><link>http://www.aygfsteel.com/Jhonney/archive/2007/12/02/164666.html</link><dc:creator>Jhonney</dc:creator><author>Jhonney</author><pubDate>Sun, 02 Dec 2007 09:45:00 GMT</pubDate><guid>http://www.aygfsteel.com/Jhonney/archive/2007/12/02/164666.html</guid><wfw:comment>http://www.aygfsteel.com/Jhonney/comments/164666.html</wfw:comment><comments>http://www.aygfsteel.com/Jhonney/archive/2007/12/02/164666.html#Feedback</comments><slash:comments>2</slash:comments><wfw:commentRss>http://www.aygfsteel.com/Jhonney/comments/commentRss/164666.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/Jhonney/services/trackbacks/164666.html</trackback:ping><description><![CDATA[<div   id="wmqeeuq"   class="tit">Dell OEM XP SP2的原版镜�?/div>
<table style="table-layout: fixed">
    <tbody>
        <tr>
            <td>
            <div   id="wmqeeuq"   class="cnt">
            <p>Dell OEM XP SP2的原版镜像：(x��)</p>
            <p>1.2004�q�台式机原版�Q�MD5 66c029d7c10bfb1b9ce1c7034d882a21</p>
            <p>2.2005�q�笔记本原版�Q�MD5 57505544DB716B451DB6CC33F1ABC0E3</p>
            <p>3.2006�q�原版：(x��)MD5 62c244a48e70b80c6baa014ca33b68ed</p>
            <p>非原版：(x��)</p>
            <p>1.772MB的那个所谓的2006.04�?/p>
            <p>2.MD5 97E6327A45A86D62E40F38504B4BB01A<br />
            </p>
            </div>
            </td>
        </tr>
    </tbody>
</table>
<img src ="http://www.aygfsteel.com/Jhonney/aggbug/164666.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/Jhonney/" target="_blank">Jhonney</a> 2007-12-02 17:45 <a href="http://www.aygfsteel.com/Jhonney/archive/2007/12/02/164666.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>随笔</title><link>http://www.aygfsteel.com/Jhonney/archive/2007/09/15/145389.html</link><dc:creator>Jhonney</dc:creator><author>Jhonney</author><pubDate>Sat, 15 Sep 2007 08:43:00 GMT</pubDate><guid>http://www.aygfsteel.com/Jhonney/archive/2007/09/15/145389.html</guid><wfw:comment>http://www.aygfsteel.com/Jhonney/comments/145389.html</wfw:comment><comments>http://www.aygfsteel.com/Jhonney/archive/2007/09/15/145389.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/Jhonney/comments/commentRss/145389.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/Jhonney/services/trackbacks/145389.html</trackback:ping><description><![CDATA[�q�一个月来一直在做专利电(sh��)子审扚w���?比较的忙,也没旉���更新BOKEE�?br />
感受最大的�?,在读研期�?我过多的重视�?ji��n)技�?醉心(j��)于技�?但是在实际的工作,��目�?软�g工程/���理斚w��的东西却一直很没有用心(j��),�q�日感觉�q�是个方�?基石
<img src ="http://www.aygfsteel.com/Jhonney/aggbug/145389.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/Jhonney/" target="_blank">Jhonney</a> 2007-09-15 16:43 <a href="http://www.aygfsteel.com/Jhonney/archive/2007/09/15/145389.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>&lt;上帝也疯�?&gt;</title><link>http://www.aygfsteel.com/Jhonney/archive/2007/09/15/145386.html</link><dc:creator>Jhonney</dc:creator><author>Jhonney</author><pubDate>Sat, 15 Sep 2007 08:34:00 GMT</pubDate><guid>http://www.aygfsteel.com/Jhonney/archive/2007/09/15/145386.html</guid><wfw:comment>http://www.aygfsteel.com/Jhonney/comments/145386.html</wfw:comment><comments>http://www.aygfsteel.com/Jhonney/archive/2007/09/15/145386.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/Jhonney/comments/commentRss/145386.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/Jhonney/services/trackbacks/145386.html</trackback:ping><description><![CDATA[昨天偶然看了(ji��n)�?的上帝也疯狂,感觉
<img src ="http://www.aygfsteel.com/Jhonney/aggbug/145386.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/Jhonney/" target="_blank">Jhonney</a> 2007-09-15 16:34 <a href="http://www.aygfsteel.com/Jhonney/archive/2007/09/15/145386.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item></channel></rss>                                                                                                                                                                <footer>
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