大约有 10,000 项符合查询结果（耗时：0.0169秒） [XML]
MySQL select 10 random rows from 600K rows fast
...ery= BD_Ejecutar($sql);
list($num_records)=mysql_fetch_row($rquery);
mysql_free_result($rquery);
$sql="SELECT id FROM pages WHERE RAND()*$num_records<20
ORDER BY RAND() LIMIT 0,10";
$rquery= BD_Ejecutar($sql);
while(list($id)=mysql_fetch_row($rquery)){
if($id_in) $id_in.=",$id";
else ...
How to debug Visual Studio extensions
...elper.OutputString method writes to the 'General' output window pane (Ctrl Alt o). I added this line in my .csproj references to get this in VS 2013
<Reference Include="Microsoft.VisualStudio.Services.Integration, Version=12.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchi...
Location Services not working in iOS 8
...cationAlwaysUsageDescription or NSLocationWhenInUseUsageDescription key in Info.plist with a message to be displayed in the prompt. Adding these solved my problem.
For more extensive information, have a look at: Core-Location-Manager-Changes-in-ios-8
...
Warning: The Copy Bundle Resources build phase contains this target's Info.plist file
...tml
Excerpt:
You are getting this warning because you probably added your Info.plist file to your Copy Bundle Resources build phase as shown in Figure
The INFOPLIST_FILE build setting specifies the name of the Info.plist associated with your target. When building a target, Xcode reads this build...
Getting value of select (dropdown) before change
... ddl.data('previous', ddl.val()); });
– free4ride
Jan 16 '14 at 15:12
5
...
how to provide a swap function for my class?
... if you absolutely need to, or provide a member swap that is called by the free function:
// version 1
class Bar{
public:
friend void swap(Bar& lhs, Bar& rhs) {
// ....
}
};
// version 2
class Bar{
public:
void swap(Bar& other) {
// ...
}
};
void swap(Bar& l...
Where do I find the current C or C++ standard documents?
...ard on Amazon
C99 Standard on Amazon
Standards committee draft versions (free)
The working drafts for future standards are often available from the committee websites:
C++ committee website
C committee website
If you want to get drafts from the current or earlier C/C++ standards, there are so...
Android OpenGL ES and 2D
...
I see a lot of good info has already been provided. I wanted to share a site that helped get up to speed on OpenGLE quick! It only took a few months and had a custom coordinate system based on the Cartesian coordinate system. I was able to re...
What is the naming convention in Python for variable and function names?
...are you using, that doesn't know that underscore continues a word? Lots of free ones that do. I use Notepad++, if an IDE isn't available. For that, can download a template for python editing. (Others can recommend even more useful free downloads.)
– ToolmakerSteve
...
How to automatically generate N “distinct” colors?
...comes to the rescue
Arbitrary N
Colour displays for categorical images (free download)
A WEB SERVICE TO PERSONALISE MAP COLOURING (free download, a webservice solution should be available by next month)
An Algorithm for the Selection of High-Contrast Color Sets (the authors offer a free C++ imple...