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记一次MongoDB性能问题 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
记一次MongoDB性能问题最近忙着把一个项目从MySQL迁移到MongoDB，在导入旧数据的过程中，遇到了些许波折，犯了不少错误，但同时也学到了不少知识，遂记录下来。公...最近忙着把一个项目从MySQL迁移到MongoDB，在导入旧数据的过...
How can I access and process nested objects, arrays or JSON?
...and arrays. How can I extract the information, i.e. access a specific or multiple values (or keys)?
26 Answers
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Learning about LINQ [closed]
One of the things I've asked a lot about on this site is LINQ . The questions I've asked have been wide and varied and often don't have much context behind them. So in an attempt to consolidate the knowledge I've acquired on Linq I'm posting this question with a view to maintaining and updating it ...
How do I delete a fixed number of rows with sorting in PostgreSQL?
I'm trying to port some old MySQL queries to PostgreSQL, but I'm having trouble with this one:
6 Answers
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Finding the number of days between two dates
How to find number of days between two dates using PHP?
33 Answers
33
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How to ignore whitespace in a regular expression subject string?
Is there a simple way to ignore the white space in a target string when searching for matches using a regular expression pattern? For example, if my search is for "cats", I would want "c ats" or "ca ts" to match. I can't strip out the whitespace beforehand because I need to find the begin and en...
Stop Visual Studio from mixing line endings in files
When opening a text based file in Visual Studio 2010 it will then write my edits with CRLF instead of the line ending format of the original file. How can I stop VS from doing this? Any half decent editor should have this capability.
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What are type lambdas in Scala and what are their benefits?
Sometime I stumble into the semi-mysterious notation of
4 Answers
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subtle differences between JavaScript and Lua [closed]
I simply love JavaScript. It's so elegant (imagine the quiet sound of lovestruck fanboy sighing in the background).
8 Answe...