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How do you configure Django for simple development and deployment?
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development, but on a live server something more robust is
often needed ( MySQL / PostgreSQL , for example).
Invariably, there are other changes to make to the Django
settings as well: different logging locations / intensities,
media paths, etc.
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Ordering by specific field value first
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There's also the MySQL FIELD function.
If you want complete sorting for all possible values:
SELECT id, name, priority
FROM mytable
ORDER BY FIELD(name, "core", "board", "other")
If you only care that "core" is first and the other values ...
Quick and easy file dialog in Python?
... show only the dialog without any other GUI elements, you have to hide the root window using the withdraw method:
import tkinter as tk
from tkinter import filedialog
root = tk.Tk()
root.withdraw()
file_path = filedialog.askopenfilename()
Python 2 variant:
import Tkinter, tkFileDialog
root = T...
MySQL remove all whitespaces from the entire column
...UPDATE `table` SET `col_name` = REPLACE(`col_name`, '\n', '')
http://dev.mysql.com/doc/refman/5.0/en/string-functions.html#function_replace
To remove first and last space(s) of column :
UPDATE `table` SET `col_name` = TRIM(`col_name`)
http://dev.mysql.com/doc/refman/5.0/en/string-functions.htm...
【Mixly×AI2系列·第5讲】手机发指令控制LED/舵机：蓝牙双向通信实战① - ...
...）。
六、联调步骤
1. 手机系统蓝牙先与 HC-05 配对（密码 1234/0000）
2. 硬件上电，Mixly 串口监视器确认无报错
3. 打开 App → ListPicker 选 "HC-05" → 状态变"已连接"
4. 点 btnON → 板载/外接 LED 亮；btnOFF → 灭
5. 拖...
Which is faster: multiple single INSERTs or one multiple-row INSERT?
I am trying to optimize one part of my code that inserts data into MySQL. Should I chain INSERTs to make one huge multiple-row INSERT or are multiple separate INSERTs faster?
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View's SELECT contains a subquery in the FROM clause
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As per documentation:
MySQL Docs
The SELECT statement cannot contain a subquery in the FROM clause.
Your workaround would be to create a view for each of your subqueries.
Then access those views from within your view view_credit_status
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Convert a Git folder to a submodule retrospectively?
...ven though I have tested this successfully)!
0. Preparation
Variables
# Root directory where repo-org lives
# and a temporary location for git filter-branch
root="$PWD"
temp='/dev/shm/tmp'
# The old repository and the subdirectory we'd like to extract
repo_old="$root/repo-old"
repo_old_directory...
JRE 1.7 - java version - returns: java/lang/NoClassDefFoundError: java/lang/Object
...-r -v rt.pack rt.jar
To recursively unpack all .pack files, from the JRE root run:
for /r %f in (*.pack) do "%JAVA_HOME%\bin\unpack200.exe" -r -q "%f" "%~pf%~nf.jar"
*nix
To unpack one .pack file (for example rt.pack), run:
/usr/bin/unpack200 -r -v rt.pack rt.jar
To recursively unpack all ....
How can I see the specific value of the sql_mode?
There are some sql_mode values in MySQL:
2 Answers
2
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