大约有 33,000 项符合查询结果（耗时：0.0480秒） [XML]
How to store a list in a column of a database table
...n a single column. Relational databases are designed specifically to store one value per row/column combination. In order to store more than one value, you must serialize your list into a single value for storage, then deserialize it upon retrieval. There is no other way to do what you're talking ab...
Stripping everything but alphanumeric chars from a string in Python
...ed the regular expressions to be slower. Interestingly, I tried this with one other option (valid_characters = string.ascii_letters + string.digits followed by join(ch for ch in string.printable if ch in valid_characters) and it was 6 microseconds quicker than the isalnum() option. Still much slow...
What is Node.js' Connect, Express and “middleware”?
...rojects in Node.js ecosystem do. Is it something like Rails' Rack? Can someone please explain?
8 Answers
...
Why does integer division in C# return an integer and not a float?
Does anyone know why integer division in C# returns an integer and not a float?
What is the idea behind it? (Is it only a legacy of C/C++?)
...
Get characters after last / in url
...ce of the slash; substr returns everything after that position.
As mentioned by redanimalwar if there is no slash this doesn't work correctly since strrpos returns false. Here's a more robust version:
$pos = strrpos($url, '/');
$id = $pos === false ? $url : substr($url, $pos + 1);
...
Regular Expressions and negating a whole character group [duplicate]
...examples I gave won't match 'ab' it's true but they also won't match 'a' alone and I need them to. Is there some simple way to do this?
...
What is DOCTYPE?
...ne how to render a page. Not including a DOCTYPE or including an incorrect one can trigger quirks mode.
The kicker here is, that quirks mode in Internet Explorer is quite different from quirks mode in Firefox (and other browsers); meaning that you'll have a much harder job, trying to ensure your pa...
Generate UML Class Diagram from Java Project [closed]
...that I can analyse my current architecture design. Of course, analysing is one thing. The other is for documentation purposes.
...
Why do loggers recommend using a logger per class?
...
With log4net, using one logger per class makes it easy to capture the source of the log message (ie. the class writing to the log). If you don't have one logger per class, but instead have one logger for the entire app, you need to resort to mo...
How to implement the activity stream in a social network
... last X items
Redis is fast and offers a way to pipeline commands across one connection - so pushing an activity out to 1000 friends takes milliseconds.
For a more detailed explanation of what I am talking about, see Redis' Twitter example: http://redis.io/topics/twitter-clone
Update February 20...