大约有 42,000 项符合查询结果（耗时：0.0589秒） [XML]
How to select rows that have current day's timestamp?
...
use DATE and CURDATE()
SELECT * FROM `table` WHERE DATE(`timestamp`) = CURDATE()
I guess using DATE still uses INDEX.
see the execution plan on the DEMO
...
Intermittent log4net RollingFileAppender locked file issue
We are seeing an intermittent issue on development and production machines whereby our log files are not getting logged to.
...
How to redirect to a 404 in Rails?
...
raise ActionController::RoutingError.new('Not Found')
end
Rails also handles AbstractController::ActionNotFound, and ActiveRecord::RecordNotFound the same way.
This does two things better:
1) It uses Rails' built in rescue_from handler to render the 404 page, and
2) it interrupts the executi...
How do I set up DNS for an apex domain (no www) pointing to a Heroku app?
I already added a custom domain to my Heroku app and it works with www.domain.com .
4 Answers
...
How do I include a pipe | in my linux find -exec command?
...f interpreting the pipe symbol as an instruction to run multiple processes and pipe the output of one process into the input of another process is the responsibility of the shell (/bin/sh or equivalent).
In your example you can either choose to use your top level shell to perform the piping like s...
Can I access constants in settings.py from templates in Django?
...quently-used settings constants to the template such as settings.MEDIA_URL and some of the language settings if you use django's built in generic views or pass in a context instance keyword argument in the render_to_response shortcut function. Here's an example of each case:
from django.shortcuts ...
T-SQL Cast versus Convert
...'t care about the extended features, use CAST.
EDIT:
As noted by @beruic and @C-F in the comments below, there is possible loss of precision when an implicit conversion is used (that is one where you use neither CAST nor CONVERT). For further information, see CAST and CONVERT and in particular thi...
How does Python 2 compare string and int? Why do lists compare as greater than numbers, and tuples g
...ring for string, numeric ordering for integers).
When you order a numeric and a non-numeric type, the numeric type comes first.
>>> 5 < 'foo'
True
>>> 5 < (1, 2)
True
>>> 5 < {}
True
>>> 5 < [1, 2]
True
When you order two incompatible types where n...
Virtual/pure virtual explained
What exactly does it mean if a function is defined as virtual and is that the same as pure virtual?
12 Answers
...
How to prevent favicon.ico requests?
...in a Web page is a good thing (normally).
However it is not always desired and sometime developers need a way to avoid the extra payload. For example an IFRAME would request a favicon without showing it.
Worst yet, in Chrome and Android an IFRAME will generate 3 requests for favicons:
"GET /favicon....