大约有 23,000 项符合查询结果(耗时:0.0508秒) [XML]
Example for sync.WaitGroup correct?
...
small improvement based on Mroth answer
using defer for Done is safer
func dosomething(millisecs time.Duration, wg *sync.WaitGroup) {
wg.Add(1)
go func() {
defer wg.Done()
duration := millisecs * time.Millisecond
tim...
What are the pros and cons of the SVN plugins for Eclipse, Subclipse and Subversive? [closed]
...
Based on this post I have been using Subclipse for 4 months but now have switched to Subversive for the simple fact that Subclipse lacks UI based conflict resolution; you get 'Edit Conflict' in synchronize view with the Subve...
Using logging in multiple modules
...nce of logging library in multiple modules for me was following solution:
base_logger.py
import logging
logger = logging
logger.basicConfig(format='%(asctime)s - %(message)s', level=logging.INFO)
Other files
from base_logger import logger
if __name__ == '__main__':
logger.info("This is an...
Loop inside React JSX
...e key property and also a code style that is not really used in React code-bases. Please consider this answer stackoverflow.com/questions/22876978/loop-inside-react-jsx/… as a correct one.
– okonetchnikov
Oct 31 '16 at 14:57
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How to add “on delete cascade” constraints?
...
Based off of @Mike Sherrill Cat Recall's answer, this is what worked for me:
ALTER TABLE "Children"
DROP CONSTRAINT "Children_parentId_fkey",
ADD CONSTRAINT "Children_parentId_fkey"
FOREIGN KEY ("parentId")
REFERENCES "P...
Catching all javascript unhandled exceptions
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Check out http://log4javascript.org it is based on Log4J. If most of your code is wrapped in try/catch statements to handle exceptions you can make use of this library as a common interface for sending output to an always available "dialog box" or logging window that...
Rails nested form with has_many :through, how to edit attributes of join model?
...ent for has_one and has_many associations.
class User < ActiveRecord::Base
has_one :profile
has_many :messages
end
The build syntax for has_many association:
user.messages.build
The build syntax for has_one association:
user.build_profile # this will work
user.profile.build # this ...
Why use a READ UNCOMMITTED isolation level?
...with read uncommitted on? Yes, in theory. You'll
find no shortage of database
architecture astronauts who start
dropping ACID science on you and all
but pull the building fire alarm when
you tell them you want to try nolock.
It's true: the theory is scary. But
here's what I think: "In...
EC2 instance types's exact network performance?
...mprehensive answer:
For t2/m3/c3/c4/r3/i2/d2 instances:
t2.nano = ??? (Based on the scaling factors, I'd expect 20-30 MBit/s)
t2.micro = ~70 MBit/s (qiita says 63 MBit/s) - t1.micro gets about ~100 Mbit/s
t2.small = ~125 MBit/s (t2, qiita says 127 MBit/s, cloudharmony says 125 Mbit/s with spikes...
What's the difference between INNER JOIN, LEFT JOIN, RIGHT JOIN and FULL JOIN? [duplicate]
...
An SQL JOIN clause is used to combine rows from two or more tables,
based on a common field between them.
There are different types of joins available in SQL:
INNER JOIN: returns rows when there is a match in both tables.
LEFT JOIN: returns all rows from the left table, even if there are ...