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Foreign key constraints: When to use ON UPDATE and ON DELETE
I'm designing my database schema using MySQL Workbench, which is pretty cool because you can do diagrams and it converts them :P
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Importing modules from parent folder
... ├── __init__.py
└── life.py
I call the . the root folder, and in my case it is located in C:\tmp\test_imports.
Steps
1) Add a setup.py to the root folder
The contents of the setup.py can be simply
from setuptools import setup, find_packages
setup(name='myproject', ...
Notifier 通知扩展：功能强大的Android通知管理工具，支持通知通道、意图、...
...以错误的值触发。因此，您需要非常仔细地考虑应用程序如何与通知交互。
如果使用Notification打开应用程序的Screen或将其带到前台，如果Screen是新创建的，则在Screen中触发 Screen.Initialize 事件。Screen的字段被赋予默认值。如果Scr...
How add context menu item to Windows Explorer for folders [closed]
...ws Explorer or on background of a directory in right panel:
HKEY_CLASSES_ROOT\Directory\Background\shell if you are administrator
HKEY_CURRENT_USER\Software\Classes\directory\Background\shell if you are a normal user
Context menu for right click on folders in right panel of Windows Explorer:
H...
MongoDB vs. Cassandra [closed]
...sandra: they are not using Cassandra for persisting tweets, they use still MySQL here (engineering.twitter.com/2010/07/cassandra-at-twitter-today.html). Ok, but I can imagine that they still store lots of data for other purposes in Cassandra.
– H6.
Jan 13 '12 a...
How do I use installed packages in PyCharm?
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For me, it was just a matter of marking the directory as a source root.
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How to determine if binary tree is balanced?
... of a tree (where the minimum height is the least number of steps from the root to a leaf, and the maximum is... well, you get the picture). Given that, we can define balance to be:
A tree where the maximum height of any branch is no more than one more than the minimum height of any branch.
(T...
How to serve static files in Flask
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from flask import Flask, request, send_from_directory
# set the project root directory as the static folder, you can set others.
app = Flask(__name__, static_url_path='')
@app.route('/js/<path:path>')
def send_js(path):
return send_from_directory('js', path)
if __name__ == "__main__":...
What is maximum query size for mysql?
What is maximum query size for mysql? Some times the server stops working when I fire a too long query.
2 Answers
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FIND_IN_SET() vs IN()
...ould even use an index on companyID.
Unfortunately, this does not work in MySQL since the latter does not support arrays.
You may find this article interesting (see #2):
10 things in MySQL (that won’t work as expected)
Update:
If there is some reasonable limit on the number of values in the...