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	<title>
	「[原创]Apache Pig的一些基础概念及用法总结（1）」的评论	</title>
	<atom:link href="https://www.codelast.com/%E5%8E%9F%E5%88%9Bpig%E4%B8%AD%E7%9A%84%E4%B8%80%E4%BA%9B%E5%9F%BA%E7%A1%80%E6%A6%82%E5%BF%B5%E6%80%BB%E7%BB%93/feed/" rel="self" type="application/rss+xml" />
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	<description>最优化之路</description>
	<lastBuildDate>Tue, 10 May 2022 10:06:25 +0000</lastBuildDate>
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	<item>
		<title>
		评论者：brianlan		</title>
		<link>https://www.codelast.com/%e5%8e%9f%e5%88%9bpig%e4%b8%ad%e7%9a%84%e4%b8%80%e4%ba%9b%e5%9f%ba%e7%a1%80%e6%a6%82%e5%bf%b5%e6%80%bb%e7%bb%93/comment-page-1/#comment-2095</link>

		<dc:creator><![CDATA[brianlan]]></dc:creator>
		<pubDate>Wed, 03 Sep 2014 00:14:01 +0000</pubDate>
		<guid isPermaLink="false">http://www.codelast.com/?p=3621#comment-2095</guid>

					<description><![CDATA[非常感谢你的分享，写得很好，已向朋友们推荐]]></description>
			<content:encoded><![CDATA[<p>非常感谢你的分享，写得很好，已向朋友们推荐</p>
]]></content:encoded>
		
			</item>
		<item>
		<title>
		评论者：wendy		</title>
		<link>https://www.codelast.com/%e5%8e%9f%e5%88%9bpig%e4%b8%ad%e7%9a%84%e4%b8%80%e4%ba%9b%e5%9f%ba%e7%a1%80%e6%a6%82%e5%bf%b5%e6%80%bb%e7%bb%93/comment-page-1/#comment-1734</link>

		<dc:creator><![CDATA[wendy]]></dc:creator>
		<pubDate>Wed, 05 Mar 2014 06:48:16 +0000</pubDate>
		<guid isPermaLink="false">http://www.codelast.com/?p=3621#comment-1734</guid>

					<description><![CDATA[回复给 &lt;a href=&quot;https://www.codelast.com/%e5%8e%9f%e5%88%9bpig%e4%b8%ad%e7%9a%84%e4%b8%80%e4%ba%9b%e5%9f%ba%e7%a1%80%e6%a6%82%e5%bf%b5%e6%80%bb%e7%bb%93/comment-page-1/#comment-1000&quot;&gt;chali&lt;/a&gt;。

同求啊 ～ 不知道怎么解决这个错误！！！ 我是parquet文件，可是把jar包弄进去也不行 ！！ 请问楼上解决这个问题了蛮？]]></description>
			<content:encoded><![CDATA[<p>回复给 <a href="https://www.codelast.com/%e5%8e%9f%e5%88%9bpig%e4%b8%ad%e7%9a%84%e4%b8%80%e4%ba%9b%e5%9f%ba%e7%a1%80%e6%a6%82%e5%bf%b5%e6%80%bb%e7%bb%93/comment-page-1/#comment-1000">chali</a>。</p>
<p>同求啊 ～ 不知道怎么解决这个错误！！！ 我是parquet文件，可是把jar包弄进去也不行 ！！ 请问楼上解决这个问题了蛮？</p>
]]></content:encoded>
		
			</item>
		<item>
		<title>
		评论者：olive		</title>
		<link>https://www.codelast.com/%e5%8e%9f%e5%88%9bpig%e4%b8%ad%e7%9a%84%e4%b8%80%e4%ba%9b%e5%9f%ba%e7%a1%80%e6%a6%82%e5%bf%b5%e6%80%bb%e7%bb%93/comment-page-1/#comment-1688</link>

		<dc:creator><![CDATA[olive]]></dc:creator>
		<pubDate>Sun, 12 Jan 2014 19:10:29 +0000</pubDate>
		<guid isPermaLink="false">http://www.codelast.com/?p=3621#comment-1688</guid>

					<description><![CDATA[回复给 &lt;a href=&quot;https://www.codelast.com/%e5%8e%9f%e5%88%9bpig%e4%b8%ad%e7%9a%84%e4%b8%80%e4%ba%9b%e5%9f%ba%e7%a1%80%e6%a6%82%e5%bf%b5%e6%80%bb%e7%bb%93/comment-page-1/#comment-1678&quot;&gt;learnhard&lt;/a&gt;。

谢谢楼主，问题解决的，还有一个问题pig_classpath是怎么配置的，引入第三方包，总是不行，比如chukwa的pig支持，以及hcatalog的支持等，执行的时候外部的方法总是不好使，关键是该如何调试。]]></description>
			<content:encoded><![CDATA[<p>回复给 <a href="https://www.codelast.com/%e5%8e%9f%e5%88%9bpig%e4%b8%ad%e7%9a%84%e4%b8%80%e4%ba%9b%e5%9f%ba%e7%a1%80%e6%a6%82%e5%bf%b5%e6%80%bb%e7%bb%93/comment-page-1/#comment-1678">learnhard</a>。</p>
<p>谢谢楼主，问题解决的，还有一个问题pig_classpath是怎么配置的，引入第三方包，总是不行，比如chukwa的pig支持，以及hcatalog的支持等，执行的时候外部的方法总是不好使，关键是该如何调试。</p>
]]></content:encoded>
		
			</item>
		<item>
		<title>
		评论者：rujingyu		</title>
		<link>https://www.codelast.com/%e5%8e%9f%e5%88%9bpig%e4%b8%ad%e7%9a%84%e4%b8%80%e4%ba%9b%e5%9f%ba%e7%a1%80%e6%a6%82%e5%bf%b5%e6%80%bb%e7%bb%93/comment-page-1/#comment-1680</link>

		<dc:creator><![CDATA[rujingyu]]></dc:creator>
		<pubDate>Thu, 02 Jan 2014 07:53:07 +0000</pubDate>
		<guid isPermaLink="false">http://www.codelast.com/?p=3621#comment-1680</guid>

					<description><![CDATA[非常受教，感谢楼主的分享]]></description>
			<content:encoded><![CDATA[<p>非常受教，感谢楼主的分享</p>
]]></content:encoded>
		
			</item>
		<item>
		<title>
		评论者：learnhard		</title>
		<link>https://www.codelast.com/%e5%8e%9f%e5%88%9bpig%e4%b8%ad%e7%9a%84%e4%b8%80%e4%ba%9b%e5%9f%ba%e7%a1%80%e6%a6%82%e5%bf%b5%e6%80%bb%e7%bb%93/comment-page-1/#comment-1678</link>

		<dc:creator><![CDATA[learnhard]]></dc:creator>
		<pubDate>Mon, 30 Dec 2013 14:41:24 +0000</pubDate>
		<guid isPermaLink="false">http://www.codelast.com/?p=3621#comment-1678</guid>

					<description><![CDATA[回复给 &lt;a href=&quot;https://www.codelast.com/%e5%8e%9f%e5%88%9bpig%e4%b8%ad%e7%9a%84%e4%b8%80%e4%ba%9b%e5%9f%ba%e7%a1%80%e6%a6%82%e5%bf%b5%e6%80%bb%e7%bb%93/comment-page-1/#comment-1677&quot;&gt;olive&lt;/a&gt;。

请参考：
http://stackoverflow.com/questions/2423949/storing-data-to-sequencefile-from-apache-pig]]></description>
			<content:encoded><![CDATA[<p>回复给 <a href="https://www.codelast.com/%e5%8e%9f%e5%88%9bpig%e4%b8%ad%e7%9a%84%e4%b8%80%e4%ba%9b%e5%9f%ba%e7%a1%80%e6%a6%82%e5%bf%b5%e6%80%bb%e7%bb%93/comment-page-1/#comment-1677">olive</a>。</p>
<p>请参考：<br />
<a href="http://stackoverflow.com/questions/2423949/storing-data-to-sequencefile-from-apache-pig" rel="nofollow ugc">http://stackoverflow.com/questions/2423949/storing-data-to-sequencefile-from-apache-pig</a></p>
]]></content:encoded>
		
			</item>
		<item>
		<title>
		评论者：olive		</title>
		<link>https://www.codelast.com/%e5%8e%9f%e5%88%9bpig%e4%b8%ad%e7%9a%84%e4%b8%80%e4%ba%9b%e5%9f%ba%e7%a1%80%e6%a6%82%e5%bf%b5%e6%80%bb%e7%bb%93/comment-page-1/#comment-1677</link>

		<dc:creator><![CDATA[olive]]></dc:creator>
		<pubDate>Mon, 30 Dec 2013 07:18:03 +0000</pubDate>
		<guid isPermaLink="false">http://www.codelast.com/?p=3621#comment-1677</guid>

					<description><![CDATA[您好
     pig怎么处理SequenceFile。]]></description>
			<content:encoded><![CDATA[<p>您好<br />
     pig怎么处理SequenceFile。</p>
]]></content:encoded>
		
			</item>
		<item>
		<title>
		评论者：yiliyas		</title>
		<link>https://www.codelast.com/%e5%8e%9f%e5%88%9bpig%e4%b8%ad%e7%9a%84%e4%b8%80%e4%ba%9b%e5%9f%ba%e7%a1%80%e6%a6%82%e5%bf%b5%e6%80%bb%e7%bb%93/comment-page-1/#comment-1527</link>

		<dc:creator><![CDATA[yiliyas]]></dc:creator>
		<pubDate>Wed, 11 Sep 2013 06:47:31 +0000</pubDate>
		<guid isPermaLink="false">http://www.codelast.com/?p=3621#comment-1527</guid>

					<description><![CDATA[好东东，多谢分享，收藏学习。
补充一点，如果需要多个输入参数，用多个-param即可，测试通过。]]></description>
			<content:encoded><![CDATA[<p>好东东，多谢分享，收藏学习。<br />
补充一点，如果需要多个输入参数，用多个-param即可，测试通过。</p>
]]></content:encoded>
		
			</item>
		<item>
		<title>
		评论者：rongzheyi		</title>
		<link>https://www.codelast.com/%e5%8e%9f%e5%88%9bpig%e4%b8%ad%e7%9a%84%e4%b8%80%e4%ba%9b%e5%9f%ba%e7%a1%80%e6%a6%82%e5%bf%b5%e6%80%bb%e7%bb%93/comment-page-1/#comment-1440</link>

		<dc:creator><![CDATA[rongzheyi]]></dc:creator>
		<pubDate>Mon, 29 Jul 2013 09:48:04 +0000</pubDate>
		<guid isPermaLink="false">http://www.codelast.com/?p=3621#comment-1440</guid>

					<description><![CDATA[写得非常明白，例子很详细。
谢谢。]]></description>
			<content:encoded><![CDATA[<p>写得非常明白，例子很详细。<br />
谢谢。</p>
]]></content:encoded>
		
			</item>
		<item>
		<title>
		评论者：learnhard		</title>
		<link>https://www.codelast.com/%e5%8e%9f%e5%88%9bpig%e4%b8%ad%e7%9a%84%e4%b8%80%e4%ba%9b%e5%9f%ba%e7%a1%80%e6%a6%82%e5%bf%b5%e6%80%bb%e7%bb%93/comment-page-1/#comment-1356</link>

		<dc:creator><![CDATA[learnhard]]></dc:creator>
		<pubDate>Tue, 25 Jun 2013 15:27:52 +0000</pubDate>
		<guid isPermaLink="false">http://www.codelast.com/?p=3621#comment-1356</guid>

					<description><![CDATA[回复给 &lt;a href=&quot;https://www.codelast.com/%e5%8e%9f%e5%88%9bpig%e4%b8%ad%e7%9a%84%e4%b8%80%e4%ba%9b%e5%9f%ba%e7%a1%80%e6%a6%82%e5%bf%b5%e6%80%bb%e7%bb%93/comment-page-1/#comment-1355&quot;&gt;cj&lt;/a&gt;。

请描述清楚问题]]></description>
			<content:encoded><![CDATA[<p>回复给 <a href="https://www.codelast.com/%e5%8e%9f%e5%88%9bpig%e4%b8%ad%e7%9a%84%e4%b8%80%e4%ba%9b%e5%9f%ba%e7%a1%80%e6%a6%82%e5%bf%b5%e6%80%bb%e7%bb%93/comment-page-1/#comment-1355">cj</a>。</p>
<p>请描述清楚问题</p>
]]></content:encoded>
		
			</item>
		<item>
		<title>
		评论者：cj		</title>
		<link>https://www.codelast.com/%e5%8e%9f%e5%88%9bpig%e4%b8%ad%e7%9a%84%e4%b8%80%e4%ba%9b%e5%9f%ba%e7%a1%80%e6%a6%82%e5%bf%b5%e6%80%bb%e7%bb%93/comment-page-1/#comment-1355</link>

		<dc:creator><![CDATA[cj]]></dc:creator>
		<pubDate>Tue, 25 Jun 2013 09:17:37 +0000</pubDate>
		<guid isPermaLink="false">http://www.codelast.com/?p=3621#comment-1355</guid>

					<description><![CDATA[date类型的filter没找到详细的哎  楼主能详细点说下么]]></description>
			<content:encoded><![CDATA[<p>date类型的filter没找到详细的哎  楼主能详细点说下么</p>
]]></content:encoded>
		
			</item>
		<item>
		<title>
		评论者：learnhard		</title>
		<link>https://www.codelast.com/%e5%8e%9f%e5%88%9bpig%e4%b8%ad%e7%9a%84%e4%b8%80%e4%ba%9b%e5%9f%ba%e7%a1%80%e6%a6%82%e5%bf%b5%e6%80%bb%e7%bb%93/comment-page-1/#comment-1341</link>

		<dc:creator><![CDATA[learnhard]]></dc:creator>
		<pubDate>Fri, 07 Jun 2013 02:39:43 +0000</pubDate>
		<guid isPermaLink="false">http://www.codelast.com/?p=3621#comment-1341</guid>

					<description><![CDATA[回复给 &lt;a href=&quot;https://www.codelast.com/%e5%8e%9f%e5%88%9bpig%e4%b8%ad%e7%9a%84%e4%b8%80%e4%ba%9b%e5%9f%ba%e7%a1%80%e6%a6%82%e5%bf%b5%e6%80%bb%e7%bb%93/comment-page-1/#comment-1339&quot;&gt;litoyao&lt;/a&gt;。

(1)IsEmpty的官方解释：
Checks if a bag or map is empty.
所以，你不能把IsEmpty用在category上，它既不是bag也不是map。
(2)经Pig 0.8试验，你所说的第二个错误并不存在。
用你给的数据：
[root@localhost ~]$ cat a.txt 
7987421	ypc	Dollar Tree	517
7987422	ypc	Snappps Pit Barbque	227
7987422	ypc	Snappps Pit Barbque	232
8152437	ypc	Smokestack Production Inc	
8152438	ypc	931 Massachusetts Ave Assoc	
8318697	ypc	Houck&#039; Wrecker Svc   71
来运行如下Pig脚本毫无问题：
poi2 = LOAD &#039;a.txt&#039; AS (vendorPoiId: chararray,vendorName: chararray,poi_name: chararray,category: chararray);
category_group = GROUP poi2 BY category;
DUMP category_group; 

输出：
(227,{(7987422,ypc,Snappps Pit Barbque,227)})
(232,{(7987422,ypc,Snappps Pit Barbque,232)})
(517,{(7987421,ypc,Dollar Tree,517)})
(,{(8152437,ypc,Smokestack Production Inc,),(8152438,ypc,931 Massachusetts Ave Assoc,),(8318697,ypc,Houck&#039; Wrecker Svc   71,)})

所以，一定是你哪里弄错了。]]></description>
			<content:encoded><![CDATA[<p>回复给 <a href="https://www.codelast.com/%e5%8e%9f%e5%88%9bpig%e4%b8%ad%e7%9a%84%e4%b8%80%e4%ba%9b%e5%9f%ba%e7%a1%80%e6%a6%82%e5%bf%b5%e6%80%bb%e7%bb%93/comment-page-1/#comment-1339">litoyao</a>。</p>
<p>(1)IsEmpty的官方解释：<br />
Checks if a bag or map is empty.<br />
所以，你不能把IsEmpty用在category上，它既不是bag也不是map。<br />
(2)经Pig 0.8试验，你所说的第二个错误并不存在。<br />
用你给的数据：<br />
[root@localhost ~]$ cat a.txt<br />
7987421	ypc	Dollar Tree	517<br />
7987422	ypc	Snappps Pit Barbque	227<br />
7987422	ypc	Snappps Pit Barbque	232<br />
8152437	ypc	Smokestack Production Inc<br />
8152438	ypc	931 Massachusetts Ave Assoc<br />
8318697	ypc	Houck' Wrecker Svc   71<br />
来运行如下Pig脚本毫无问题：<br />
poi2 = LOAD 'a.txt' AS (vendorPoiId: chararray,vendorName: chararray,poi_name: chararray,category: chararray);<br />
category_group = GROUP poi2 BY category;<br />
DUMP category_group; </p>
<p>输出：<br />
(227,{(7987422,ypc,Snappps Pit Barbque,227)})<br />
(232,{(7987422,ypc,Snappps Pit Barbque,232)})<br />
(517,{(7987421,ypc,Dollar Tree,517)})<br />
(,{(8152437,ypc,Smokestack Production Inc,),(8152438,ypc,931 Massachusetts Ave Assoc,),(8318697,ypc,Houck' Wrecker Svc   71,)})</p>
<p>所以，一定是你哪里弄错了。</p>
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			</item>
		<item>
		<title>
		评论者：litoyao		</title>
		<link>https://www.codelast.com/%e5%8e%9f%e5%88%9bpig%e4%b8%ad%e7%9a%84%e4%b8%80%e4%ba%9b%e5%9f%ba%e7%a1%80%e6%a6%82%e5%bf%b5%e6%80%bb%e7%bb%93/comment-page-1/#comment-1339</link>

		<dc:creator><![CDATA[litoyao]]></dc:creator>
		<pubDate>Wed, 05 Jun 2013 08:54:42 +0000</pubDate>
		<guid isPermaLink="false">http://www.codelast.com/?p=3621#comment-1339</guid>

					<description><![CDATA[LZ, 非常感谢回答呀，我不家一个非常奇怪的问题
首先category_id是一个string, 证据如下：
caSchema.add(new Schema.FieldSchema(&quot;category_id&quot;, DataType.CHARARRAY));

Describe poi2;
poi2: {vendorPoiId: chararray,vendorName: chararray,poi_name: chararray,category: chararray}

dump poi2，列出几条
(7987421,ypc,Dollar Tree,517)
(7987422,ypc,Snappps Pit Barbque,227)
(7987422,ypc,Snappps Pit Barbque,232)
(8152437,ypc,Smokestack Production Inc,)
(8152438,ypc,931 Massachusetts Ave Assoc,)
(8318697,ypc,Houck&#039;s Wrecker Svc,71)

但是我在IsEmpty（category）的时候，报错 ERROR 2102: Cannot test a int for emptiness.

以及 category_group = group poi2 by category;
也报错，ClassCastException: java.lang.Integer cannot be cast to java.lang.String

怎么pig 把category当成Integer呢？？？？？？]]></description>
			<content:encoded><![CDATA[<p>LZ, 非常感谢回答呀，我不家一个非常奇怪的问题<br />
首先category_id是一个string, 证据如下：<br />
caSchema.add(new Schema.FieldSchema("category_id", DataType.CHARARRAY));</p>
<p>Describe poi2;<br />
poi2: {vendorPoiId: chararray,vendorName: chararray,poi_name: chararray,category: chararray}</p>
<p>dump poi2，列出几条<br />
(7987421,ypc,Dollar Tree,517)<br />
(7987422,ypc,Snappps Pit Barbque,227)<br />
(7987422,ypc,Snappps Pit Barbque,232)<br />
(8152437,ypc,Smokestack Production Inc,)<br />
(8152438,ypc,931 Massachusetts Ave Assoc,)<br />
(8318697,ypc,Houck's Wrecker Svc,71)</p>
<p>但是我在IsEmpty（category）的时候，报错 ERROR 2102: Cannot test a int for emptiness.</p>
<p>以及 category_group = group poi2 by category;<br />
也报错，ClassCastException: java.lang.Integer cannot be cast to java.lang.String</p>
<p>怎么pig 把category当成Integer呢？？？？？？</p>
]]></content:encoded>
		
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		<title>
		评论者：litoyao		</title>
		<link>https://www.codelast.com/%e5%8e%9f%e5%88%9bpig%e4%b8%ad%e7%9a%84%e4%b8%80%e4%ba%9b%e5%9f%ba%e7%a1%80%e6%a6%82%e5%bf%b5%e6%80%bb%e7%bb%93/comment-page-1/#comment-1338</link>

		<dc:creator><![CDATA[litoyao]]></dc:creator>
		<pubDate>Wed, 05 Jun 2013 08:44:02 +0000</pubDate>
		<guid isPermaLink="false">http://www.codelast.com/?p=3621#comment-1338</guid>

					<description><![CDATA[回复给 &lt;a href=&quot;https://www.codelast.com/%e5%8e%9f%e5%88%9bpig%e4%b8%ad%e7%9a%84%e4%b8%80%e4%ba%9b%e5%9f%ba%e7%a1%80%e6%a6%82%e5%bf%b5%e6%80%bb%e7%bb%93/comment-page-1/#comment-1337&quot;&gt;learnhard&lt;/a&gt;。

是的，不过我也刚好在网上找到答案了。
flatten(TOBAG(*))]]></description>
			<content:encoded><![CDATA[<p>回复给 <a href="https://www.codelast.com/%e5%8e%9f%e5%88%9bpig%e4%b8%ad%e7%9a%84%e4%b8%80%e4%ba%9b%e5%9f%ba%e7%a1%80%e6%a6%82%e5%bf%b5%e6%80%bb%e7%bb%93/comment-page-1/#comment-1337">learnhard</a>。</p>
<p>是的，不过我也刚好在网上找到答案了。<br />
flatten(TOBAG(*))</p>
]]></content:encoded>
		
			</item>
		<item>
		<title>
		评论者：learnhard		</title>
		<link>https://www.codelast.com/%e5%8e%9f%e5%88%9bpig%e4%b8%ad%e7%9a%84%e4%b8%80%e4%ba%9b%e5%9f%ba%e7%a1%80%e6%a6%82%e5%bf%b5%e6%80%bb%e7%bb%93/comment-page-1/#comment-1337</link>

		<dc:creator><![CDATA[learnhard]]></dc:creator>
		<pubDate>Wed, 05 Jun 2013 02:52:05 +0000</pubDate>
		<guid isPermaLink="false">http://www.codelast.com/?p=3621#comment-1337</guid>

					<description><![CDATA[回复给 &lt;a href=&quot;https://www.codelast.com/%e5%8e%9f%e5%88%9bpig%e4%b8%ad%e7%9a%84%e4%b8%80%e4%ba%9b%e5%9f%ba%e7%a1%80%e6%a6%82%e5%bf%b5%e6%80%bb%e7%bb%93/comment-page-1/#comment-1333&quot;&gt;litoyao&lt;/a&gt;。

你的意思是不是：
把一个tuple变成一个bag，然后再FLATTEN？]]></description>
			<content:encoded><![CDATA[<p>回复给 <a href="https://www.codelast.com/%e5%8e%9f%e5%88%9bpig%e4%b8%ad%e7%9a%84%e4%b8%80%e4%ba%9b%e5%9f%ba%e7%a1%80%e6%a6%82%e5%bf%b5%e6%80%bb%e7%bb%93/comment-page-1/#comment-1333">litoyao</a>。</p>
<p>你的意思是不是：<br />
把一个tuple变成一个bag，然后再FLATTEN？</p>
]]></content:encoded>
		
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		<item>
		<title>
		评论者：litoyao		</title>
		<link>https://www.codelast.com/%e5%8e%9f%e5%88%9bpig%e4%b8%ad%e7%9a%84%e4%b8%80%e4%ba%9b%e5%9f%ba%e7%a1%80%e6%a6%82%e5%bf%b5%e6%80%bb%e7%bb%93/comment-page-1/#comment-1333</link>

		<dc:creator><![CDATA[litoyao]]></dc:creator>
		<pubDate>Mon, 03 Jun 2013 06:38:18 +0000</pubDate>
		<guid isPermaLink="false">http://www.codelast.com/?p=3621#comment-1333</guid>

					<description><![CDATA[LZ ，请教一个问题。

怎么把
(1,2,3)  变成
1
2
3
???]]></description>
			<content:encoded><![CDATA[<p>LZ ，请教一个问题。</p>
<p>怎么把<br />
(1,2,3)  变成<br />
1<br />
2<br />
3<br />
???</p>
]]></content:encoded>
		
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