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How do I calculate tables size in Oracle
...E is CHOOSE), gathering statistics can cause Oracle to stop using the rule-based optimizer and start using the cost-based optimizer for a set of queries which can be a major performance headache if it is done unexpectedly in production. If your statistics are accurate, you can query USER_TABLES (or...
How to create a custom string representation for a class object?
...f you have one class that you want to have a custom static repr, the class-based approach above works great. But if you have several, you'd have to generate a metaclass similar to MC for each, and that can get tiresome. In that case, taking your metaprogramming one step further and creating a metacl...
How do I iterate over an NSArray?
...for OS X 10.6 / iOS 4.0 and above, you also have the option of using block-based APIs to enumerate arrays and other collections:
[array enumerateObjectsUsingBlock:^(id object, NSUInteger idx, BOOL *stop) {
// do something with object
}];
You can also use -enumerateObjectsWithOptions:usingBloc...
Disabling and enabling a html input button
...
$('#Button').prop('disabled', false);
Demo Here
P.S. Updated the code based on jquery 1.6.1 changes. As a suggestion, always use the latest jquery files and the prop() method.
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What does -D_XOPEN_SOURCE do/mean?
... changes depending on what options and #defines you have, for example with basename(3).
See also:
Linux: gcc with -std=c99 complains about not knowing struct timespec
glibc feature test macros
The Compilation Environment - Open Group Base Specification issue 6 (a.k.a. X/Open 6)
POSIX - Wikipedia
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What is the reason for performing a double fork when creating a daemon?
... it to acquire one by opening a terminal in the future (System V-
based systems). This second fork guarantees that the child is no
longer a session leader, preventing the daemon from ever acquiring
a controlling terminal.
So it is to ensure that the daemon is re-parented onto...
What character encoding should I use for a HTTP header?
... value will be "quoted-printable". "B" could also be used if you wanted to BASE64-encode the value.
– GargantuChet
Jun 30 '14 at 21:53
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App Inventor 2 拓展参考文档 · App Inventor 2 中文网
...图像】TaifunImage 拓展：图片压缩剪裁处理
【图像】SimpleBase64 拓展：图像Base64编解码传输
【图像】KIO4_Base64 拓展：更强大的图像Base64编解码工具，解码后的图像可写入到文件
【图像】KIO4_AnimatedGif：Gif 动画扩展，可点击，可...
Is there a Java equivalent or methodology for the typedef keyword in C++?
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The referenced anti-pattern article is based on the assumption that you just want to shorten your typing (which would actually hide the helpful type information). The real use most people want is to disambiguate types and let the compiler do its job for you. See...
asynchronous vs non-blocking
...sually isn't "in parallel", nor "another thread", mostly it's notification-based. that is: don't block, don't poll, just get the signal. of course, it can be argued that the signal is coming from the 'real world' which can be thought as 'another thread'...
– Javier
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