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Check for array not empty: any?
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251
any? isn't the same as not empty? in some cases.
>> [nil, 1].any?
=> true
>> [...
Heroku Postgres - terminate hung query (idle in transaction)
...s likely to be the query you'd like to terminate. I'll assume the pid is 1234 below.
You may cancel a query through SQL (i.e. without shell access) as long as it's yours or you have super user access:
select pg_cancel_backend(1234);
That's a "friendly" request to cancel the 1234-query, and with...
Include headers when using SELECT INTO OUTFILE?
...d code those headers yourself. Something like:
SELECT 'ColName1', 'ColName2', 'ColName3'
UNION ALL
SELECT ColName1, ColName2, ColName3
FROM YourTable
INTO OUTFILE '/path/outfile'
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matplotlib.pyplot will not forget previous plots - how can I flush/refresh?
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2 Answers
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Lock, mutex, semaphore… what's the difference?
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edited Jan 29 '19 at 7:40
answered Feb 25 '10 at 9:21
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Equals(=) vs. LIKE
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283
Different Operators
LIKE and = are different operators. Most answers here focus on the wildca...
编译器内部的秘密--微软的编译器是如何解析Try/Catch/Throw的 - C/C++ - 清...
...的并不一致。原文译自：http://www.codeproject.com/Articles/175482/Compiler-Internals-How-Try-Catch-Throw-are-Interprpreted-by-the-Microsoft-Compiler
引言
开始文章之前，先声明几件重要事情。本文不是一篇介绍如何在x86架构上详细地实现异常处理(exceptio...
What does the forward slash mean in the CSS font shorthand?
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2 Answers
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Active
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编译器内部的秘密--微软的编译器是如何解析Try/Catch/Throw的 - C/C++ - 清...
...的并不一致。原文译自：http://www.codeproject.com/Articles/175482/Compiler-Internals-How-Try-Catch-Throw-are-Interprpreted-by-the-Microsoft-Compiler
引言
开始文章之前，先声明几件重要事情。本文不是一篇介绍如何在x86架构上详细地实现异常处理(exceptio...