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MQTT接入EasyIoT平台 - 创客硬件开发 - 清泛IT社区，为创新赋能！
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代码差别主要在：地址、端口不同，且使用用户名、密码认证（这里仅仅是演示，隐藏了部分，以实际为准），订阅主题使用上面新建的。
本地SQLite实现注册登录功能 - App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
建表的SQL语句如下：
CREATE TABLE user(username TEXT PRIMARY KEY, password TEXT);
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最后提一下日志调试功能：
上面其实是用户密码信息，在日志控制台中能够输出便于调试查看。
单页web应用（SPA）的简单介绍 - 更多技术 - 清泛网 - 专注C/C++及内核技术
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2.用pushsate记录浏览器的历史，驱动界面发送变化
如何搭建一个基础的SPA
首先，我们画出三个div，它们实际上是作为三个界面存在界面上的，body作为界面外框容器，限制着它们的大小。为了给每个界面配对一个hash地址...
How to upload a file in Django? [closed]
...e Django stores uploaded files and from what URL Django serves them. MEDIA_ROOT and MEDIA_URL are in settings.py by default but they are empty. See the first lines in Django Managing Files for details. Remember also set the database and add myapp to INSTALLED_APPS
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import os
BASE_DIR = os.path....
Get table column names in MySQL?
Is there a way to grab the columns name of a table in mysql?
using php
19 Answers
19
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How to find all serial devices (ttyS, ttyUSB, ..) on Linux without opening them?
... system. A trimmed down example:
# ll /sys/class/tty/ttyUSB*
lrwxrwxrwx 1 root root 0 2012-03-28 20:43 /sys/class/tty/ttyUSB0 -> ../../devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4/2-1.4:1.0/ttyUSB0/tty/ttyUSB0/
lrwxrwxrwx 1 root root 0 2012-03-28 20:44 /sys/class/tty/ttyUSB1 -> ../../device...
How do MySQL indexes work?
I am really interested in how MySQL indexes work, more specifically, how can they return the data requested without scanning the entire table?
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How to use MySQL DECIMAL?
I can't quite get a grasp of MySQL's DECIMAL. I need the row to be able to contain a number anywhere from 00.0001 to 99.9999. How would I structure it to work like so?
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log messages appearing twice with Python Logging
...g is left set to True. A
common scenario is to attach handlers only to the root logger, and to
let propagation take care of the rest.
So, if you want a custom handler on "test", and you don't want its messages also going to the root handler, the answer is simple: turn off its propagate flag:
logger...
Installing in Homebrew errors
...ething installed via homebrew that requires special user permissions, like mysql, make sure to give those permissions back (as the above command gives recursive ownership to everything inside /usr/local to you ($USER). In the case of mysql, it's…
sudo chown -RL mysql:mysql /usr/local/mysql/dat...