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[科普] __MACOSX是什么文件夹？ - 更多技术 - 清泛网 - 专注C/C++及内核技术
...击右键选择“压缩为…”即可，开发者就可以把这个压缩包上传到网上供人下载。但是有一个问题，苹果公司和其它的大的软件公司一样，十分擅长曲解和附会用户的意思，它很多时候并不是完全按照你的意思去做的。例如在这...
App Inventor 2 自定义拍照及录像媒体文件的路径，进行目录规整 · App Inventor 2 中文网
...非会员价格￥29，会员价￥9.9。自助购买
测试通过，包售后技术支持。可自动按照界面指定的文件夹进行拍照的照片规整。
video_path.aia
照相机 + 摄像机 路径规整
原价￥69，现价非会员价格￥39，会员价...
How to run a background task in a servlet based web application?
I'm using Java and I want to keep a servlet continuously running in my application, but I'm not getting how to do it. My servlet has a method which gives counts of the user from a database on a daily basis as well as the total count of the users from the whole database. So I want to keep the servlet...
MySQL主从服务器数据一致性的核对与修复 - 数据库(内核) - 清泛网 - 专注C/...
...里的pt-table-checksum和pt-table-sync可以搞定此类问题。它们的安装很简单，可以依照自己的操作系统选择下载rpm或者deb软件包来安装，当然也可以使用源代码来安装，不过要注意的是，必须确保系统已经安装了依赖的Perl软件包：
s...
Best data type to store money values in MySQL
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Since money needs an exact representation don't use data types that are only approximate like float. You can use a fixed-point numeric data type for that like
decimal(15,2)
15 is the precision (total length of value including decimal ...
List of All Locales and Their Short Codes?
...r a PHP application I am writing. Is there much variation in this data between platforms?
7 Answers
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What's the cause of this FatalExecutionEngineError in .NET 4.5 beta? [closed]
...naturally. Suddenly my code thew a very nasty-sounding FatalExecutionEngineError exception. I spent a good 30 minutes trying to isolate and minimize the culprit sample. Compile this using Visual Studio 2012 as a console app:
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App Inventor 2 中文网 · 项目指南
...工作 您需要准备的 一台安装好Chrome浏览器的电脑（平板不建议），输入网址 fun123.cn 即可。 一部Android安卓手机，扫左边二维码安装“AI伴侣”，用于测试我们编好的App程序，实时查看...
What is JNDI? What is its basic use? When is it used?
...The most common use case is to set up a database connection pool on a Java EE application server. Any application that's deployed on that server can gain access to the connections they need using the JNDI name java:comp/env/FooBarPool without having to know the details about the connection.
This ha...
Do I need elements in persistence.xml?
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The persistence.xml has a jar-file that you can use. From the Java EE 5 tutorial:
<persistence>
<persistence-unit name="OrderManagement">
<description>This unit manages orders and customers.
It does not rely on any vendor-specific features and can
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