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How do I get SUM function in MySQL to return '0' if no values are found?
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Thanks Brad. That does the job nicely.
– Nick
Sep 29 '11 at 23:54
1
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Check if directory mounted with bash
...king the exit code of grep, which indicates if there was a match. Since I don't want the output to be displayed when there is a match, I'm redirecting it to /dev/null.
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Class with single method — best approach?
... be filled in as well... Had we created a class with the single purpose of doing what this static method did, we could solve this by taking in the required parameters in the constructor, and allowing the user to set optional values through properties, or methods to set multiple interdependent values...
Run an untrusted C program in a sandbox in Linux that prevents it from opening files, forking, etc.?
...e able to help you more if you told as what exactly it is that you want to do.
EDIT:
Systrace would work for your case, but I think that something based on the Linux Security Model like AppArmor or SELinux is a more standard, and thus preferred, alternative, depending on your distribution.
EDIT 2...
Android: How to bind spinner to custom object list?
... your Spinner with android:entries="@array/labels"
When you need a value, do something like this (no, you don't have to chain it):
String selectedVal = getResources().getStringArray(R.array.values)[spinner.getSelectedItemPosition()];
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What does it mean to start a PHP function with an ampersand?
... use a function to find to
which variable a reference should be
bound. Do not use return-by-reference
to increase performance. The engine
will automatically optimize this on
its own. Only return references when
you have a valid technical reason to
do so.
See Returning References.
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What is a practical use for a closure in JavaScript?
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I've used closures to do things like:
a = (function () {
var privatefunction = function () {
alert('hello');
}
return {
publicfunction : function () {
privatefunction();
}
}
})();
As you can ...
Volatile boolean vs AtomicBoolean
What does AtomicBoolean do that a volatile boolean cannot achieve?
11 Answers
11
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rails 3.1.0 ActionView::Template::Error (application.css isn't precompiled)
...tion.rb (if you are working in production). And if you want to be able to do live/lazy compile in production, you also need to enable the lazy compile in application.rb.
– avioing
Oct 19 '11 at 22:29
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Database Design for Revisions?
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Do not put it all in one table with an IsCurrent discriminator attribute. This just causes problems down the line, requires surrogate keys and all sorts of other problems.
Design 2 does have problems with schema changes. If...