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关于快讯采集，仅提取频道列表中新增项

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Release： 2016-06-13 11:10:00
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关于新闻采集，仅提取频道列表中新增项
做新闻采集程序，以腾讯的某频道为例“http://tech.qq.com/hlwxw.htm” 。每30分钟上来扫描看看有没有新增新闻，可能上面频道的列表增加了两条，其他23条都是已经抓完的了（一共25条的列表），仅把这两条能出来放进数据库，请问应该怎样做？？


------解决方案--------------------
每抓一条新闻，都把那条新闻的id存储在你的表里。比如

exists_id
----------
1231
1232
1233
...


采集的时候，先判断下这条新闻的id是否在你那个表里存在。。。
然后就不用说了
Related labels：
exists nbsp
source：php.cn
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