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Add unique constraint to combination of two columns
...ert the row and returning an exception (exceptions are expensive).
http://www.sqlperformance.com/2012/08/t-sql-queries/error-handling
http://www.mssqltips.com/sqlservertip/2632/checking-for-potential-constraint-violations-before-entering-sql-server-try-and-catch-logic/
If you want to prevent exce...
Image resizing client-side with JavaScript before upload to the server
...
If you were resizing before uploading I just found out this http://www.plupload.com/
It does all the magic for you in any imaginable method.
Unfortunately HTML5 resize only is supported with Mozilla browser, but you can redirect other browsers to Flash and Silverlight.
I just tried it and...
Where can I learn jQuery? Is it worth it?
...ve, b) the grief it causes it you, and c) how much fun it can be!
http://www.west-wind.com/weblog/
http://mattberseth.com/
I used the book jQuery in Action
http://www.amazon.com/jQuery-Action-Bear-Bibeault/dp/1933988355/ref=sr_1_1?ie=UTF8&s=books&qid=1219716122&sr=1-1 (I bought it u...
Linux, Why can't I write even though I have group permissions?
.../foobar/test_file //make a new file
sudo chown root:www-data /foobar/test_file //User=root group=www-data
sudo chmod 474 /foobar/test_file //owner and others get only read,
//group gets rwx
sudo groupadd www-da...
How does inline Javascript (in HTML) work?
...ed in script tags or not, it's gonna be interpreted the same way.
https://www.w3.org/TR/html5/webappapis.html#event-handler-idl-attributes
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foll...
Free space in a CMD shell
...ter the output by various command-line options.
You can get it from http://www.paulsadowski.com/WSH/cmdprogs.htm, http://unxutils.sourceforge.net/ or somewhere else. It's a standard unix-util like du.
df -h will show all your drive's used and available disk space. For example:
M:\>df -h
Filesyst...
Do you debug C++ code in Vim? How? [closed]
...recently wrote a blog post that walks through an example session.
https://www.dannyadam.com/blog/2019/05/debugging-in-vim/
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...
How can I check if a URL exists via PHP?
...
Here:
$file = 'http://www.example.com/somefile.jpg';
$file_headers = @get_headers($file);
if(!$file_headers || $file_headers[0] == 'HTTP/1.1 404 Not Found') {
$exists = false;
}
else {
$exists = true;
}
From here and right below the above...
What is the difference between libsqlite3.dylib and libsqlite3.0.dylib?
...e3.0.dylib! So recommend or to add libsqlite3.dylib!
Reference-: http://www.databaseskill.com/3734528/
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Unicode Processing in C++
...standards, the current C++11 standard has built in Unicode support: http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2011/n3242.pdf
So the truly best practice for Unicode processing in C++ would be to use the built in facilities for it. That isn't always a possibility with older code bases though...