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Format string, integer with leading zeros
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Use the format string "img_%03d.jpg" to get decimal numbers with three digits and leading zeros.
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What's wrong with nullable columns in composite primary keys?
... of "something not being present"', 'NULL == "don't know"', etc are vague & misleading & really only mnemonics for absent statements re how NULL or any value is or can or was intended to be used--per the rest of the post. (Including in inspiring the (bad) design of SQL NULL features.) They ...
How to do something to each file in a directory with a batch script
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Another way:
for %f in (*.mp4) do call ffmpeg -i "%~f" -vcodec copy -acodec copy "%~nf.avi"
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Reduce, fold or scan (Left/Right)?
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In general, all 6 fold functions apply a binary operator to each element of a collection. The result of each step is passed on to the next step (as input to one of the binary operator's two arguments). This way we can cumulate a result.
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jQuery OR Selector?
... wondering if there is a way to have "OR" logic in jQuery selectors. For example, I know an element is either a descendant of an element with class classA or classB, and I want to do something like elem.parents('.classA or .classB') . Does jQuery provide such functionality?
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How to determine the longest increasing subsequence using dynamic programming?
...1;
for (int j = i - 1; j >= 0; j--)
if (DP[j] + 1 > DP[i] && array[j] < array[i])
{
DP[i] = DP[j] + 1;
prev[i] = j;
}
if (DP[i] > maxLength)
{
bestEnd = i;
maxLength = DP[i];
}
}
I use the array prev to be able later...
How to download a file from a URL in C#?
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using (var client = new WebClient())
{
client.DownloadFile("http://example.com/file/song/a.mpeg", "a.mpeg");
}
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What is the significance of ProjectTypeGuids tag in the visual studio project file
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Do you really need a new project type if it is a project with .xaml and .cs files? If you do, I think you'll have to use a different Guid.
– Julien Hoarau
May 26 '10 at 11:33
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Batch file to copy files from one folder to another folder
I have a storage folder on a network in which all users will store their active data on a server. Now that server is going to be replaced by a new one due to place problem so I need to copy sub folders files from the old server storage folder to new server storage folder. I have below ex:
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How can I safely encode a string in Java to use as a filename?
...t something like this. (Note: this should be treated as an illustrative example, not something to copy and paste.)
char fileSep = '/'; // ... or do this portably.
char escape = '%'; // ... or some other legal char.
String s = ...
int len = s.length();
StringBuilder sb = new StringBuilder(len);
for...