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How do I partially update an object in MongoDB so the new object will overlay / merge with the exist
...e data then?
You know you can do the following:
db.collection.update( { _id:...} , { $set: someObjectWithNewData }
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BLE协议—广播和扫描 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...广播方式的报文有4种，分别为可连接的非定向广播（ADV_IND）、可连接的定向广播（ADV_DIRECT_IND）、可扫描非定向广播（ADV_SCAN_IND）、不可连接的非定向广播（ADV_NONCONN_IND）
4种广播的使用场景各不相同
可连接的非定向广播（A...
C++ display stack trace on exception
...
On the home page of StackTrace, I see throw stack_runtime_error. Am I correct in deducing that this lib only works for exceptions derived from that class, and not for std::exception or exceptions from third-party libraries?
– Thomas
No...
Function return value in PowerShell
... a single line.
You can read more about the return semantics on the about_Return page on TechNet, or by invoking the help return command from PowerShell itself.
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How to prevent Browser cache for php site
...ragma: no-cache');
AND Option 2 IS ALWAYS BETTER in order to avoid proxy based caching issue.
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How to get parameters from a URL string?
I have a HTML form field $_POST["url"] having some URL strings as the value.
Example values are:
13 Answers
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Tracking Google Analytics Page Views with AngularJS
... set up your tracking code in your main index.html file with a name of var _gaq and MyCtrl is what you've defined in the ng-controller directive.
function MyCtrl($scope, $location, $window) {
$scope.$on('$viewContentLoaded', function(event) {
$window._gaq.push(['_trackPageView', $location.url...
What is function overloading and overriding in php?
...that method.
In PHP, you can only overload methods using the magic method __call.
An example of overriding:
<?php
class Foo {
function myFoo() {
return "Foo";
}
}
class Bar extends Foo {
function myFoo() {
return "Bar";
}
}
$foo = new Foo;
$bar = new Bar;
echo($foo-&...
Perform commands over ssh with Python
...o.SSHClient()
ssh.connect(server, username=username, password=password)
ssh_stdin, ssh_stdout, ssh_stderr = ssh.exec_command(cmd_to_execute)
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Transposing a NumPy array
...range(10) then a is array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]) as produced by a.__repr__(). This is a 1-dimensional (i.e. a.ndim --> 1) vector as indicated by the square brackets []. The array( ... ) is not seen when you do either print(a) or a.__str__().
– dtlussier
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