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社会化海量数据采集爬虫框架搭建 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...框架（参考）。xpath 是一种结构化网页元素选择器，支持列表和单节点数据获取，他的好处可以支持规整网页数据抓取。我们使用的是google插件 XPath Helper，这个玩意可以支持在网页点击元素生成xpath，就省去了自己去查找xpath的...
Searching if value exists in a list of objects using Linq
...s => names.Contains(cus.FirstName));
or to retrieve the customer from csv of similar list
string input = "John,Max,Pete";
List<string> names = input.Split(',').ToList();
customer = customers.FirstOrDefault(cus => names.Contains(cus.FirstName));
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How to express a NOT IN query with ActiveRecord/Rails?
...p(&:id).join(','). I can't remember if Rails will the argument into a CSV list if it is enumerable.
You could also do this:
# in topic.rb
named_scope :not_in_forums, lambda { |forums| { :conditions => ['forum_id not in (?)', forums.select(&:id).join(',')] }
# in your controller
Topic...
What is the App_Data folder used for in Visual Studio?
...published through the web server.
For example we use it to update a local CSV of a contact us form. If the preferred method of emails fails or any querying of the data source is required, the App_Data files are there.
It's not ideal, but it it's a good fall-back.
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“The 'Microsoft.ACE.OLEDB.12.0' provider is not registered on the local machine” Error in importing
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Save it as a CSV file and import it as a flat source file.
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How to rename files and folder in Amazon S3?
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What if i need to rename all .csv files. how come i do?
– LUZO
Mar 22 '18 at 14:21
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Changing all files' extensions in a folder with one command on Windows
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I had to use #1: ren "*.csv" "#1.json"
– elmalto
Jun 10 '15 at 15:39
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Get names of all keys in the collection
... The context show what is usefull: if data is normalized (ex. origen from CSV file), it is useful... For data imported from SQL is useful.
– Peter Krauss
Sep 22 '15 at 10:17
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How to get URI from an asset File?
... Doesn't work anymore String fileName = "file:///android_asset/file.csv"; System.out.println(new File(fileName).exists()); // prints false
– Elgirhath
Jun 19 at 20:15
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TCP 的那些事儿（上） - 更多技术 - 清泛网 - 专注C/C++及内核技术
...Linux设置成了30s）为什么要这有TIME_WAIT？为什么不直接给转成CLOSED状态呢？主要有两个原因：1）TIME_WAIT确保有足够的时间让对端收到了ACK，如果被动关闭的那方没有收到Ack，就会触发被动端重发Fin，一来一去正好2个MSL，2）有足...