大约有 18,336 项符合查询结果（耗时：0.0378秒） [XML]
H2 in-memory database. Table not found
...se with URL "jdbc:h2:test" . I create a table using CREATE TABLE PERSON (ID INT PRIMARY KEY, FIRSTNAME VARCHAR(64), LASTNAME VARCHAR(64)); . I then select everything from this (empty) table using SELECT * FROM PERSON . So far, so good.
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Convert integer to hexadecimal and back again
...o: Convert Between Hexadecimal Strings and Numeric Types (C# Programming Guide) for more information and examples.
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How to get value of selected radio button?
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var rates = document.getElementById('rates').value;
The rates element is a div, so it won't have a value. This is probably where the undefined is coming from.
The checked property will tell you whether the element is selected:
if (document.getElementById...
How to vertically align a html radio button to it's label?
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Try this:
input[type="radio"] {
margin-top: -1px;
vertical-align: middle;
}
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What's wrong with using == to compare floats in Java?
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the correct way to test floats for 'equality' is:
if(Math.abs(sectionID - currentSectionID) < epsilon)
where epsilon is a very small number like 0.00000001, depending on the desired precision.
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Returning http status code from Web Api controller
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I did not know the answer so asked the ASP.NET team here.
So the trick is to change the signature to HttpResponseMessage and use Request.CreateResponse.
[ResponseType(typeof(User))]
public HttpResponseMessage GetUser(HttpReque...
Is there any kind of hash code function in JavaScript?
...m trying to create an object of unique objects, a set. I had the brilliant idea of just using a JavaScript object with objects for the property names. Such as,
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How do I update if exists, insert if not (AKA “upsert” or “merge”) in MySQL?
...ERT ... ON DUPLICATE KEY UPDATE. For example:
INSERT INTO `usage`
(`thing_id`, `times_used`, `first_time_used`)
VALUES
(4815162342, 1, NOW())
ON DUPLICATE KEY UPDATE
`times_used` = `times_used` + 1
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How to center canvas in html5
...0;
margin-left: auto;
margin-right: auto;
display: block;
width: 800px;
}
Edit
Since this answer is quite popular, let me add a little bit more details.
The above properties will horizontally center the canvas, div or whatever other node you have relative to it's parent. There ...
How exactly to use Notification.Builder
... so we can use this to support API level v4 and up:
http://developer.android.com/reference/android/support/v4/app/NotificationCompat.Builder.html
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