大约有 18,340 项符合查询结果（耗时：0.0239秒） [XML]
实现一个简单的服务端推方案 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...便主动通知Nginx，并把相应的标识（比如一个自增的整数ID）保存在Nginx共享内存中，接下来，Nginx不会再去轮询数据库，而是改为轮询本地的共享内存，通过比对标识来判断是否有新消息，如果有便给客户端发出响应。
注：服...
Advantages and disadvantages of GUID / UUID database keys
...ses would have been made a lot easier if all the database keys had been GUID / UUID values. I've considered going down this path a few times, but there's always a bit of uncertainty, especially around performance and un-read-out-over-the-phone-able URLs.
...
Best practices for copying files with Maven
...sition, they are not. Use the copy task if you need to perform some unavoidable one-off customization:
<project>
[...]
<build>
<plugins>
[...]
<plugin>
<artifactId>maven-antrun-plugin</artifactId>
<executions>
...
How do I use variables in Oracle SQL Developer?
...
I am using the SQL-Developer in Version 3.2. The other stuff didn't work for me, but this did:
define value1 = 'sysdate'
SELECT &&value1 from dual;
Also it's the slickest way presented here, yet.
(If you omit the "define"-part you'll be prompted for that value)
...
How do I put a border around an Android textview?
...hape drawable (a rectangle) as background for the view.
<TextView android:text="Some text" android:background="@drawable/back"/>
And rectangle drawable back.xml (put into res/drawable folder):
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle" &g...
Should I put input elements inside a label element?
...
<label for="lastname">Last Name</label>
<input type="text" id="lastname" />
or
<input type="text" id="lastname" />
<label for="lastname">Last Name</label>
or
<label>
<input type="text" name="lastname" />
Last Name
</label&...
SVG gradient using CSS
... shape-rendering: crispEdges;
fill: url(#MyGradient);
}
<svg width="100" height="50" version="1.1" xmlns="http://www.w3.org/2000/svg">
<style type="text/css">
rect{fill:url(#MyGradient)}
</style>
<defs>
<linearGradient id="M...
How should equals and hashcode be implemented when using JPA and Hibernate
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Hibernate has a nice and long description of when / how to override equals() / hashCode() in documentation
The gist of it is you only need to worry about it if your entity will be part of a Set or if you're going to be detaching / attaching its instances. The latter is not that common. T...
Getting the location from an IP address [duplicate]
...good and reliable way to do this in PHP? I am using JavaScript for client-side scripting, PHP for server-side scripting, and MySQL for the database.
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How to change the text of a label?
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ASP.Net automatically generates unique client IDs for server-side controls.
Change it to
$('#<%= lblVessel.ClientID %>')
In ASP.Net 4.0, you could also set the ClientIDMode property to Static instead.
...