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大数据能否拯救中国足球？ - 资讯 - 清泛网 - 专注C/C++及内核技术
...难。
未来大数据在足球相关产业中的应用前景到底如何？从球队、球员的日常训练到整个职业联赛球员大数据库的建立，从可穿戴设备到体育赛事转播的制作包装，大数据可介入的发力点又在哪里？
事实上，随着80亿中超(...
In Ruby on Rails, what's the difference between DateTime, Timestamp, Time and Date?
...ith Rails and everything to do with whatever database you're using.
Using MySQL as an example (if for no other reason because it's most popular), you have DATE, DATETIME, TIME and TIMESTAMP column data types; just as you have CHAR, VARCHAR, FLOAT and INTEGER.
So, you ask, what's the difference? We...
Where can I get a list of Ansible pre-defined variables?
...
"root": "/dev/mapper/precise32-root"
}, ...
大数据：用数据指导APP运营 - 资讯 - 清泛网 - 专注C/C++及内核技术
...感觉在不知不觉中获得了提升，这一点，非常重要。
3 如何获取数据
获取数据的渠道有很多，而方式基本就是自己做和使用外部工具两种方式。
自己做的话，App可以选择“埋点”、log等方式，而Web可以通过log、日志与按钮埋...
How to convert JSON to XML or XML to JSON?
... doesn't need to perfectly conform to W3C standard, but 1. you must have a root element and 2. you cannot start element names with numbers are two of the enforced XML standards I have found when using Newtonsoft and MS libraries.
In older versions, Blank elements do not convert to JSON. They are ign...
SecurityException: Permission denied (missing INTERNET permission?)
...things are getting more tricky if you also do not mind your app running on rooted devices too. There're tools available in Google Play your users can install to control permission granted to installed apps at run-time - for example: Permissions Denied and others. This can also be done with CyanogenM...
What column type/length should I use for storing a Bcrypt hashed password in a Database?
...spectively.
As you use the 2a format, you’ll need 60 bytes. And thus for MySQL I’ll recommend to use the CHAR(60) BINARYor BINARY(60) (see The _bin and binary Collations for information about the difference).
CHAR is not binary safe and equality does not depend solely on the byte value but on th...
No route matches [GET] /assets
...source was helpful. So I took Nginx configuration from there and added the root directive, pointing to the public directory. Without this it doesn't work.
# serve static assets
location ~ ^/assets/ {
expires 1y;
root /path/to/my/cool_project/public;
add_header Cache-Control pu...
micro:bit 微控制器教程 · App Inventor 2 中文网
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教程概述
本教程将指导您如何使用 App Inventor 2 通过蓝牙连接和控制 micro:bit 微控制器。您将学会：
蓝牙连接 micro:bit 设备
读取 micro:bit 传感器数据（如温度传感器）
向 micro:bit 发送控制指令
...
How to do a case sensitive search in WHERE clause (I'm using SQL Server)?
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In MySQL if You don't want to change the collation and want to perform case sensitive search then just use binary keyword like this:
SELECT * FROM table_name WHERE binary username=@search_parameter and binary password=@search_p...