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setTimeout or setInterval?
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drum machine by chromium project using setTimeout("schedule()", 0); So browser won't have unnecessary stack when it is background tab for chrome or lack of resources.
– Elliot Yap
Feb 23 '12 at 4:50
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Postgresql - unable to drop database because of some auto connections to DB
... I try to drop database I get:
ERROR: database "pilot" is being accessed by other users
DETAIL: There is 1 other session using the database.
First You need to revoke
REVOKE CONNECT ON DATABASE TARGET_DB FROM public;
Then use:
SELECT pg_terminate_backend(pg_stat_activity.pid)
FROM pg_stat_ac...
Is there a good reason I see VARCHAR(255) used so often (as opposed to another length)?
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@CharlesBretana: By "fake UTF-8" I mean MySQL's "utf8" encoding, which as I mentioned reserves (and is limited to) 3 bytes per character. This isn't a very good version of UTF-8; if you want decent UTF-8 in MySQL, you have to use its "utf8mb...
Retrieve only static fields declared in Java class
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I stumbled across this question by accident and felt it needed a Java 8 update using streams:
public static List<Field> getStatics(Class<?> clazz) {
List<Field> result;
result = Arrays.stream(clazz.getDeclaredFields())
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jQuery hide element while preserving its space in page layout
...u interact with the element, even though you can't see it! (As pointed out by DeadPassive.)
Usually that's not what you want. But perhaps occasionally you might?
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How to restart a rails server on Heroku?
...ith alias hra='heroku restart --app '
Which you can make a permanent alias by adding it to your .bashrc or .bash_aliases file as described at:
https://askubuntu.com/questions/17536/how-do-i-create-a-permanent-bash-alias and
Creating permanent executable aliases
Then you can just type hra app_name
Y...
How to generate a random number in C++?
... function or class producing actually random data definitively (guaranteed by the standard). The only standard tool that approaches this problem is std::random_device that unfortunately still does not provide guarantees of actual randomness.
Depending on the nature of application you should first de...
How to load JAR files dynamically at Runtime?
... be able to load JAR files dynamically. I'm told there's a way of doing it by writing your own ClassLoader , but that's a lot of work for something that should (in my mind at least) be as easy as calling a method with a JAR file as its argument.
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Mercurial (hg) commit only certain files
...run with hg commit --config ui.interface=curses --interactive or generally by adding the the following to your .hgrc:
[ui]
interface = curses
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MySQL Select Date Equal to Today
...se the CONCAT with CURDATE() to the entire time of the day and then filter by using the BETWEEN in WHERE condition:
SELECT users.id, DATE_FORMAT(users.signup_date, '%Y-%m-%d')
FROM users
WHERE (users.signup_date BETWEEN CONCAT(CURDATE(), ' 00:00:00') AND CONCAT(CURDATE(), ' 23:59:59'))
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