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提升大数据分析思想，拥抱大数据未来 - 资讯 - 清泛网 - 专注C/C++及内核技术
...据的理解仍然维持在单一和特定用途的层面，那么在数据开发过程中容易出现缺乏灵活性、信息不全面的情况，在利用数据开发未来机遇方面，组织或将会陷于被动的境地。而成功的例子的则要数亚马逊和Salesforce了，这两家公...
Get value from hidden field using jQuery
...t type="hidden" value="" id='h_v' class='h_v'> Using jQuery I want to alert the user to this value .
7 Answers
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Boolean vs tinyint(1) for boolean values in MySQL
...nged a non nullable bit(1) to a nullable tinyint(1) by using the following script:
ALTER TABLE TableName MODIFY Setting BOOLEAN null;
Then Dapper started throwing Exceptions. I tried to look at the difference before and after the script. And noticed the bit(1) had changed to tinyint(1).
I then r...
程序员用数据思维教你如何追女生 - 杂谈 - 清泛网 - 专注C/C++及内核技术
...涉猎恋爱技能，进行自学
交给你一个项目，遇到不会的开发工具怎么办？学啊！我们程序员拥有超强的自学能力。
要充分利用知识管理，我们不会谈恋爱，但是我们可以收集资源自学啊！我们可以看书啊，我们可以听罗辑思...
How do I detect when someone shakes an iPhone?
...milar (in iPhone OS 3.0+), only in my case I wanted it app-wide so I could alert various parts of the app when a shake occurred. Here's what I ended up doing.
First, I subclassed UIWindow. This is easy peasy. Create a new class file with an interface such as MotionWindow : UIWindow (feel free to pi...
querySelector and querySelectorAll vs getElementsByClassName and getElementById in JavaScript
...e-vs-queryselectorall/25. Conclusion : one should far more prefer pure javascript than jquery, and the specific functions getElementById and getElementsByClassName. The className selection can be few hundreds times slower without getElementsByClassName.
– Atrahasis
...
Detecting arrow key presses in JavaScript
...down = function(e) {
switch (e.keyCode) {
case 37:
alert('left');
break;
case 38:
alert('up');
break;
case 39:
alert('right');
break;
case 40:
alert('down');
break;
...
Find JavaScript function definition in Chrome
...e thing they don't seem to have (that I could find) is a way to find a JavaScript function's definition. This would be super handy for me because I'm working on a site that includes many external JS files. Sure grep solves this but in the browser would be much better. I mean, the browser has to know...
Error in SQL script: Only one statement is allowed per batch
I have 4 sql scripts that I want to run in a DACPAC in PostDeployment, but when I try to build the VS project for 3 of them I get this error:
...
Handling optional parameters in javascript
... = props.id || 1;
props.callback = props.callback || function(){};
alert( props.callback )
};
getData( {
id: 3,
callback: function(){ alert('hi'); }
} );
Benefits:
you don't have to account for argument order
you don't have to do type checking
it's easier to define default valu...