大约有 30,000 项符合查询结果（耗时：0.0487秒） [XML]
Check that Field Exists with MongoDB
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Suppose we have a collection like below:
{
"_id":"1234"
"open":"Yes"
"things":{
"paper":1234
"bottle":"Available"
"bottle_count":40
}
}
We want to know if the bottle field is present or not?
Ans:
db.products.fi...
What is the behavior of integer division?
...a%b shall equal a.
and the corresponding footnote:
88) This is often called ‘‘truncation toward zero’’.
Of course two points to note are:
3 The usual arithmetic conversions are performed on the operands.
and:
5 The result of the / operator is the
quotient from the divisio...
Convert all first letter to upper case, rest lower for each word
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I wouldn't call them jerks. The thing with "ToTitleCase" is that it's culture-dependent, hence it has to be in the System.Globalization namespace. Going through CurrentThread is just done to get the current Culture of the Thread (Be awa...
What's the difference between encoding and charset?
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Basically:
charset is the set of characters you can use
encoding is the way these characters are stored into memory
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What is the point of “final class” in Java?
...hat it's immutable, because Strings are. As a result of this, I know I can call any method on the String object safely, and not change the passed String. If I were to extend String, and change the implementation of substring to change the actual String, then the String object you expected to be immu...
What is the reason why “synchronized” is not allowed in Java 8 interface methods?
...tart() {
System.out.println("I am " + this.getClass() + ". sonStarting,calling parent now ... ");
super.parentStart();
System.out.println("I am " + this.getClass() + ". sonFinished");
}
}
public class SonSync2 extends ParentSync {
public void sonStart() {
System.out.println("I am...
Automating the InvokeRequired code pattern
...ontrol.Invoke(action);
} else {
action();
}
}
And can be called like this
richEditControl1.InvokeIfRequired(() =>
{
// Do anything you want with the control here
richEditControl1.RtfText = value;
RtfHelpers.AddMissingStyles(richEditControl1);
});
There is no need ...
Do I use , , or for SVG files?
...se <img> with script fallbacks
to png version (for older IE and android < 3). One clean and simple
way to do that:
<img src="your.svg" onerror="this.src='your.png'">.
This will behave much like a GIF image, and if your browser supports declarative animations (SMIL) then those will ...
Importing Maven project into Eclipse
...ateimport an existing maven project with Eclipse. Actually, it doesn't provide real integration, it just generates the .project and .classpath files (it has also WTP support) from a Maven project. I've used this plugin during years and was very happy with it (and very unsatisfied at this time by Ecl...
Activate a virtualenv via fabric as deploy user
I want to run my fabric script locally, which will in turn, log into my server, switch user to deploy, activate the projects .virtualenv, which will change dir to the project and issue a git pull.
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