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select * vs select column
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This is NOT true. One example off the top of my head is when you want only the value of an indexed column in MySQL (for example, just to check for row existence), and you're using MyISAM storage engine, it'll grab the data from the MYI file, which could be in mem...
How can I use Spring Security without sessions?
...low:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx...
How to sort a dataframe by multiple column(s)
... add-on tools -- see this simpler answer which uses a trick right from the top of the example(order) code:
R> dd[with(dd, order(-z, b)), ]
b x y z
4 Low C 9 2
2 Med D 3 1
1 Hi A 8 1
3 Hi A 9 1
Edit some 2+ years later: It was just asked how to do this by column index. The answer is to s...
Google Analytics - Failed to load resource: http://www.google-analytics.com/ga.js
.../ instead of the protocol-relative URL by default. This means changing
'//www.google-analytics.com/analytics.js'
into
'https://www.google-analytics.com/analytics.js'
Example:
<script>
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
(i[r].q=i[r].q||[]).pu...
ros 基本调试 - 更多技术 - 清泛网 - 专注C/C++及内核技术
ros 基本调试原文地址：http: www.reactos.org wiki Debugging欢迎拍砖。。本文讲述了调试ROS的各种方法和必要步骤。目录1.简介2.可用的调试方法2.1通...原文地址：http://www.reactos.org/wiki/Debugging
欢迎拍砖。。
本文讲述了调试ROS的各种方...
How to make a chain of function decorators?
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# If you are not familiar with unpacking, check:
# http://www.saltycrane.com/blog/2008/01/how-to-use-args-and-kwargs-in-python/
function_to_decorate(*args, **kwargs)
return a_wrapper_accepting_arbitrary_arguments
@a_decorator_passing_arbitrary_arguments
def function_wit...
JavaScript and Threads
... Safari 4 and details of how they implemented transparent custom events on top of the postMessage interface.
– Sam Hasler
Jul 9 '09 at 15:49
6
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Which “href” value should I use for JavaScript links, “#” or “javascript:void(0)”?
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'#' will take the user back to the top of the page, so I usually go with void(0).
javascript:; also behaves like javascript:void(0);
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Reading 64bit Registry from a 32bit application
...ce import tab. In Visual Studio, you require using Microsoft.Win32; at the top of your code.
Tip: To familiarize yourself with the new null handling operators, try out (and debug) the following code in LinqPad:
Example 3: Demonstrating null handling operators
static string[] test { get { return null...
Custom toast on Android: a simple example
...o, if someone can explain why, would be great! developer.android.com/guide/topics/ui/notifiers/toasts#java
– Nestor Perez
Oct 31 '19 at 14:50
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