大约有 922 项符合查询结果（耗时：0.0252秒） [XML]
Which timestamp type should I choose in a PostgreSQL database?
...time handling and arithmetic is fantastic and Option 3 is fine in the general case. It is, however, an incomplete view of time and timezones and can be supplemented:
Store the name of a user’s time zone as a user preference (e.g. America/Los_Angeles, not -0700).
Have user events/time data submit...
Why would you use an ivar?
I usually see this question asked the other way, such as Must every ivar be a property? (and I like bbum's answer to this Q).
...
My Understanding of HTTP Polling, Long Polling, HTTP Streaming and WebSockets
...hem. Some of the questions I read are related to specific implementation challenges while others focus on general concepts. I just want to make sure I understood all of the concepts and the reasoning why technology X was invented over technology Y and so on. So here goes:
...
What does T&& (double ampersand) mean in C++11?
...
It declares an rvalue reference (standards proposal doc).
Here's an introduction to rvalue references.
Here's a fantastic in-depth look at rvalue references by one of Microsoft's standard library developers.
CAUTION: the linked articl...
Best way to represent a fraction in Java?
...est version of this code, including unit tests is now hosted on GitHub and also available via Maven Central. I'm leaving my original code here so that this answer isn't just a link...
import java.math.*;
/**
* Arbitrary-precision fractions, utilizing BigIntegers for numerator and
* denominator...
Append an object to a list in R in amortized constant time, O(1)?
...irthday. Some kind readers keep repeating any shortcomings with it, so by all means also see some of the comments below. One suggestion for list types:
newlist <- list(oldlist, list(someobj))
In general, R types can make it hard to have one and just one idiom for all types and uses.
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Polymorphism in C++
...x);
f(y);
Here, f() is to perform some operation and is being given values x and y as inputs.
To exhibit polymorphism, f() must be able to operate with values of at least two distinct types (e.g. int and double), finding and executing distinct type-appropriate code.
C++ mechanisms for ...
REDHAT 6.4 X64下ORACLE 11GR2静默安装 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
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检查下内存 管方要求最小1G 推荐2G或者大于2G
Grep MemTotal /proc/meminfo
检查一下磁盘空间
中文乱码。解决办法
外观，字符编码改成UTF-8
已经可以正常显示中文了，我们没有单独指定的TMP挂载点，所以剩下的空间都可...
How can I transform between the two styles of public key format, one “BEGIN RSA PUBLIC KEY”, the oth
...LBBq1N0bWi1e2i+83txOCg4yV2oVXhBo8pYEJ8LT3el6Smxol3C1oFMVdwPgc0v
Tl25XucMcG/ALE/KNY6pqC2AQ6R2ERlVgPiUWOPatVkt7+Bs3h5Ramxh7XjBOXeu
lmCpGSynXNcpZ/06+vofGi/2MlpQZNhHAo8eayMp6FcvNucIpUndo1X8dKMv3Y26
ZQIDAQAB
-----END PUBLIC KEY-----');
$rsa->setPublicKey();
echo $rsa->getPublicKey(CRYPT_RSA_PUBLIC...
Reference: mod_rewrite, URL rewriting and “pretty links” explained
...s not request a file, it requests just some arbitrary URL. The request may also look like this:
GET /foo/bar?baz=42 HTTP/1.1
This is just as valid a request for a URL, and it has more obviously nothing to do with files.
The web server is an application listening on a port, accepting HTTP request...