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Which is more efficient: Multiple MySQL tables or one large table?
...Originally it was set up in various tables meaning data is linked with UserIds and outputting via sometimes complicated calls to display and manipulate the data as required. Setting up a new system, it almost makes sense to combine all of these tables into one big table of related content.
...
Can I set an opacity only to the background image of a div?
...ght: 0;
background: url(test.jpg) center center;
opacity: .4;
width: 100%;
height: 100%;
}
See test case on jsFiddle
:before and ::before pseudo-element
Another trick is to use the CSS 2.1 :before or CSS 3 ::before pseudo-elements. :before pseudo-element is supported in IE from v...
Find element's index in pandas Series
...I admit that there should be a better way to do that, but this at least avoids iterating and looping through the object and moves it to the C level.
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What is the difference between jQuery: text() and html() ?
...t;/b>');
});
</script>
</head>
<body>
<div id="div1"></div>
<div id="div2"></div>
</body>
</html>
A difference that may not be so obvious is described in the jQuery API documentation
In the documentation for .html():
The .html(...
Android - border for button
...ow code
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<gradient android:startColor="#FFFFFF"
android:endColor="#00FF00"
android:angle="270" />
<corners android:radius="3dp" />...
How does the “this” keyword work?
... JavaScript code that is evaluated at the top-level, e.g. when directly inside a <script>:
<script>
alert("I'm evaluated in the initial global execution context!");
setTimeout(function () {
alert("I'm NOT evaluated in the initial global execution context.");
}, 1);
</scri...
Excel RTD(Excel Real-Time Data)实时刷新数据技术 - C/C++ - 清泛网 - 专注C/C++及内核技术
...时数据检索。RTD 工作表函数使用以下语法：
"=RTD(ProgID, Server, String 1, String 2, ... String n)"
第一个变量 ProgID 表示Real-Time Data 服务器（RTD Server）的编程标识符 (ProgID)。Server 变量指示运行RTD Server的计算机的名称；如果RTD Server在...
Cross-thread operation not valid: Control 'textBox1' accessed from a thread other than the thread it
...ectly in the serialport1_DataReceived method, use this pattern:
delegate void SetTextCallback(string text);
private void SetText(string text)
{
// InvokeRequired required compares the thread ID of the
// calling thread to the thread ID of the creating thread.
// If these threads are different...
What is the difference between DAO and Repository patterns?
...Repository is an abstraction of a collection of objects.
DAO would be considered closer to the database, often table-centric.
Repository would be considered closer to the Domain, dealing only in Aggregate Roots.
Repository could be implemented using DAO's, but you wouldn't do the opposite.
Al...
Update or Insert (multiple rows and columns) from subquery in PostgreSQL
... as col2, t3.foobar as col3
FROM table2 t2 INNER JOIN table3 t3 ON t2.id = t3.t2_id
WHERE t2.created_at > '2016-01-01'
) AS subquery
WHERE table1.id = subquery.col1;
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