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Throw an error in a MySQL trigger
...example on how to write the trigger in the link?I have two columns (idUser and idGuest) that must be mutually exclusive in the table orders, but i'm fairly new to triggers and i'm finding difficulties in writing it!Thx.
– Nicola Peluchetti
Mar 12 '11 at 14:44
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What is a Context Free Grammar?
...to me what a context free grammar is? After looking at the Wikipedia entry and then the Wikipedia entry on formal grammar, I am left utterly and totally befuddled. Would someone be so kind as to explain what these things are?
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How can I make grep print the lines below and above each matching line? [duplicate]
I have to parse a very large file and I want to use the command grep (or any other tool).
3 Answers
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Elegant way to check for missing packages and install them?
...de with coauthors these days. Many of them are novice/intermediate R users and don't realize that they have to install packages they don't already have.
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How can I calculate an md5 checksum of a directory?
...l files of a particular type ( *.py for example) placed under a directory and all sub-directories.
15 Answers
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Utilizing multi core for tar+gzip/bzip compression/decompression
I normally compress using tar zcvf and decompress using tar zxvf (using gzip due to habit).
6 Answers
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Difference between char* and const char*?
...cleared up with the use of a variable after the statements mentioned above and by giving reference to that variable.
– ankit.karwasra
Oct 8 '13 at 9:16
3
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Why does ReSharper tell me “implicitly captured closure”?
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The warning tells you that the variables end and start stay alive as any of the lambdas inside this method stay alive.
Take a look at the short example
protected override void OnLoad(EventArgs e)
{
base.OnLoad(e);
int i = 0;
Random g = new Random();
t...
Handling Touch Event in UILabel and hooking it up to an IBAction
...rner try the tag property. make sure to use labelTap: instead of labelTap. and use - (void) labelTap:(id)sender;.
– thedjaney
Jul 28 '14 at 9:43
1
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Natural Sort Order in C#
...The easiest thing to do is just P/Invoke the built-in function in Windows, and use it as the comparison function in your IComparer:
[DllImport("shlwapi.dll", CharSet = CharSet.Unicode)]
private static extern int StrCmpLogicalW(string psz1, string psz2);
Michael Kaplan has some examples of how thi...