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How to add column if not exists on PostgreSQL?
...o add column x to table y , but only when x column doesn't exist ? I found only solution here how to check if column exists.
...
A cron job for rails: best practices?
...on for each task. Implement the logic of the task as controller code, Then set up a cronjob at the OS level that uses wget to invoke the URL of this controller and action at the appropriate time intervals. The advantages of this method are you:
Have full access to all your Rails objects just as in...
ContinuousSpeech 连续语音识别扩展：持续语音识别无需重复启动 · App Inventor 2 中文网
...提示音 SoundEnabled
控制系统提示音的开关状态。设置为 false 可禁用识别开始和结束时的提示音。
版本 Version
返回扩展的版本号。
方法 Methods
启动 Start()
启动连续语音识别。识别器将持续运行，直到...
Determine the process pid listening on a certain port
As the title says, I'm running multiple game servers, and every of them has the same name but different PID and the port number. I would like to match the PID of the server which is listening on certain port, and then I would like to kill this process. I need that in order to complete my bas...
Why doesn't django's model.save() call full_clean()?
...e that declares a receiver, we can use an app as INSTALLED_APPS section in settings.py
INSTALLED_APPS = [
# ...
'django_fullclean',
# your apps here,
]
Before that, you may need to install django-fullclean using PyPI:
pip install django-fullclean
...
What's the most concise way to read query parameters in AngularJS?
...gt; {chapterId:1, sectionId:2, search:'moby'}
EDIT: You can also get and set query parameters with the $location service (available in ng), particularly its search method: $location.search().
$routeParams are less useful after the controller's initial load; $location.search() can be called anyti...
Percentage width in a RelativeLayout
... can replace the buttons with some EditText to fit your needs.
Be sure to set the layout_width to 0dp or your views may not be scaled properly.
Note that the weight sum doesn't have to equal 1, I just find it easier to read like this. You can set the first weight to 7 and the second to 3 and it wi...
Visual Studio 2010 always thinks project is out of date, but nothing has changed
...te. Project item 'c:\foo\bar.xml' has 'Copy to Output Directory' attribute set to 'Copy always'.
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How to call any method asynchronously in c#
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How would I use this technique and have a timeout set?
– Su Llewellyn
Jun 17 at 18:22
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Splitting string into multiple rows in Oracle
...,]+', 1, levels.column_value)) as error
from
temp t,
table(cast(multiset(select level from dual connect by level <= length (regexp_replace(t.error, '[^,]+')) + 1) as sys.OdciNumberList)) levels
order by name
EDIT:
Here is a simple (as in, "not in depth") explanation of the query.
leng...