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Try-finally block prevents StackOverflowError
Take a look at the following two methods:
6 Answers
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INSERT INTO…SELECT for all MySQL columns
...entry_date < '2011-01-01 00:00:00';
If the id columns is an auto-increment column and you already have some data in both tables then in some cases you may want to omit the id from the column list and generate new ids instead to avoid insert an id that already exists in the original table. If yo...
Java 8 NullPointerException in Collectors.toMap
...etty, but it works. Result:
1: true
2: true
3: null
(this tutorial helped me the most.)
EDIT:
Unlike Collectors.toMap, this will silently replace values if you have the same key multiple times, as @mmdemirbas pointed out in the comments. If you don't want this, look at the link in the comment.
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Example for boost shared_mutex (multiple reads/one write)?
I have a multithreaded app that has to read some data often, and occasionally that data is updated. Right now a mutex keeps access to that data safe, but it's expensive because I would like multiple threads to be able to read simultaneously, and only lock them out when an update is needed (the updat...
Regular expression for a string containing one word but not another
I'm setting up some goals in Google Analytics and could use a little regex help.
4 Answers
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Lua简明教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...可以一条语句上赋多个值，如：
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name, age, bGay = "haoel", 37, false, "haoel@hotmail.com"
上面的代码中，因为只有3个变量，所以第四个值被丢弃。
函数也可以返回多个值：
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Most efficient way to increment a Map value in Java
...d too basic for this forum, but we'll see. I'm wondering how to refactor some code for better performance that is getting run a bunch of times.
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Convert NSData to String?
...rwise nil will be returned:
Returns nil if the initialization fails for some reason (for example if data does not represent valid data for encoding).
Prior Swift 3.0
String(data: yourData, encoding: NSUTF8StringEncoding)
Swift 3.0 Onwards
String(data: yourData, encoding: .utf8)
See String#init(d...
How to deal with “java.lang.OutOfMemoryError: Java heap space” error?
...al font designer) on Java 5 . Recently, I am running into java.lang.OutOfMemoryError: Java heap space error because I am not being conservative on memory usage. The user can open unlimited number of files, and the program keeps the opened objects in the memory. After a quick research I found Erg...
What's the difference between a web site and a web application? [closed]
I'm stumped trying to come up to a difference between a website and a web application for myself. As I see it, a web site points to a specific page and a web application is more of some sort of 'portal' to content and information.
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