大约有 42,000 项符合查询结果（耗时：0.0661秒） [XML]
What is the most robust way to force a UIView to redraw?
... building my view hierarchy. the subclass in question gets passed the data and it's drawRect method now has everything it needs to render.
...
Rails params explained?
Could anyone explain params in Rails controller: where they come from, and what they are referencing?
5 Answers
...
Difference between no-cache and must-revalidate
...st-Modified, the agent has nothing to use to validate what it has in cache and must download the whole payload again. So when the RFC says "revalidate" that probably means, re-fetch.
– Luke Puplett
Nov 13 '13 at 11:55
...
Best Practices: working with long, multiline strings in PHP?
...t
of your multiline string.
$var
EOT;
The difference between Heredoc and Nowdoc is that PHP code embedded in a heredoc gets executed, while PHP code in Nowdoc will be printed out as is.
$var = "foo";
$text = <<<'EOT'
My $var
EOT;
In this case $text will have the value My $var.
N...
Is there a way for non-root processes to bind to “privileged” ports on Linux?
...
Okay, thanks to the people who pointed out the capabilities system and CAP_NET_BIND_SERVICE capability. If you have a recent kernel, it is indeed possible to use this to start a service as non-root but bind low ports. The short answer is that you do:
setcap 'cap_net_bind_service=+ep' /path/...
Trim spaces from start and end of string
I am trying to find a way to trim spaces from the start and end of the title string. I was using this, but it doesn't seem to be working:
...
COUNT(*) vs. COUNT(1) vs. COUNT(pk): which is better? [duplicate]
...
Bottom Line
Use either COUNT(field) or COUNT(*), and stick with it consistently, and if your database allows COUNT(tableHere) or COUNT(tableHere.*), use that.
In short, don't use COUNT(1) for anything. It's a one-trick pony, which rarely does what you want, and in those ...
Value cannot be null. Parameter name: source
...
I had this one a while back, and the answer isn't necessarily what you'd expect. This error message often crops up when your connection string is wrong.
At a guess, you'll need something like this:
<connectionStrings>
<add name="hublisherE...
Wrong Manifest.mf in IntelliJ IDEA created .jar
...ntelliJ IDEA's jar artifact but instead of my manifest.mf containing the standard
7 Answers
...
Good Hash Function for Strings
I'm trying to think up a good hash function for strings. And I was thinking it might be a good idea to sum up the unicode values for the first five characters in the string (assuming it has five, otherwise stop where it ends). Would that be a good idea, or is it a bad one?
...