大约有 40,000 项符合查询结果（耗时：0.0499秒） [XML]
How to avoid mysql 'Deadlock found when trying to get lock; try restarting transaction'
...work in ascending order:
Change
DELETE FROM onlineusers
WHERE datetime <= now() - INTERVAL 900 SECOND
To
DELETE FROM onlineusers
WHERE id IN (
SELECT id FROM onlineusers
WHERE datetime <= now() - INTERVAL 900 SECOND
ORDER BY id
) u;
Another thing to keep in mind is that mysq...
Label Alignment in iOS 6 - UITextAlignment deprecated
...at the enum MAY change at some time in the future and cause unexpected results. That's all. No doomsday scenario in this case, but better practices should prevail.
– Brenden
Nov 2 '12 at 19:36
...
Python's time.clock() vs. time.time() accuracy?
...this is the function to use for benchmarking Python or timing algorithms."<br> The Python docs don't seem to be accurate based on the answers given here. time.clock() is not always what you want for benchmarking. especially with the existence of the timeit module
– Corey ...
How to get the first five character of a String
...'s length less than the characters required.
If you want to get the result back in string then you can use:
Using String Constructor and LINQ's Take
string firstFivChar = new string(yourStringVariable.Take(5).ToArray());
The plus with the approach is not checking for length before hand.
...
How to fix a locale setting warning from Perl?
...shrc solved it for me... then must reload using source ~/.bashrc... Thnks <3
– Enissay
Aug 2 '13 at 12:22
...
How to get the IP address of the docker host from inside a docker container
...
/sbin/ip route|awk '/default/ { print $3 }'
As @MichaelNeale noticed, there is no sense to use this method in Dockerfile (except when we need this IP during build time only), because this IP will be hardcoded during build time.
...
How to change position of Toast in Android?
...ys the text a little bit above the bottom of the screen, which is the default position.
8 Answers
...
convert_tz returns null
... /usr/share/zoneinfo | mysql -u root -p mysql
mysql is the name of the built-in database that holds MySQL-specific configuration data.
share
|
improve this answer
|
follow
...
How to expand/collapse a diff sections in Vimdiff?
...fied outside of vimdiff.
:set noscrollbind -> temporarily disable simultaneous scrolling on both buffers, reenable by :set scrollbind and scrolling.
Most of what you asked for is folding: vim user manual's chapter on folding. Outside of diffs I sometime use:
zo -> open fold.
zc -> clo...
async/await - when to return a Task vs void?
...he garbage collector comes to clean up the task, it sees that the task resulted in an exception, and nobody handled the exception. When that happens, the TaskScheduler.UnobservedTaskException handler runs. You should never let this happen. To use your example,
public static async void AsyncMethod2(...