大约有 38,000 项符合查询结果（耗时：0.0485秒） [XML]
When should I use nil and NULL in Objective-C?
...
Yeah, as cobbal says, they are the same. It is more a contextual reference where NULL is a pointer to 0x0, nil is a non-existent objective-c object and Nil is a non-existent objective-c class, but technically they are all just 0. Also, it is NULL not null -- null is in Ja...
How to Update Multiple Array Elements in mongodb
...t and save approach. But I used Couch before Mongo so that approach seems more natural since there is no query API for Couch, just a REST api for whole documents
– adam
Dec 15 '11 at 19:50
...
Avoiding instanceof in Java
...ls". Essentially he's addressing cases like this, when polymorphism causes more trouble than it solves.
The issue is that to use polymorphism you have to make the logic of "handle" part of each 'switching' class - i.e. Integer etc. in this case. Clearly this is not practical. Sometimes it isn't ev...
Differences between utf8 and latin1
...ibake. You may find the introductory text of this article useful (and even more if you know a bit Java).
Note that full 4-byte UTF-8 support was only introduced in MySQL 5.5. Before that version, it only goes up to 3 bytes per character, not 4 bytes per character. So, it supported only the BMP plan...
How to play a notification sound on websites?
...
|
show 2 more comments
83
...
Changing the width of Bootstrap popover
... of your popover, like so:
/* The max width is dependant on the container (more info below) */
.popover{
max-width: 100%; /* Max Width of the popover (depending on the container!) */
}
If this doesn't work, you probably want the solution below and alter your container element. (View the JSFiddl...
How should you build your database from source control?
...d "own" database objects in this model?
Developers?
DBAs?
Data Analysts?
More than one?
Usually DBAs approve the model (before check-in or after as part of code review). They definitely own performance related objects. But in general the team own it [and employer, of course :)]
...
How do I get a background location update every n minutes in my iOS application?
...the location manager? is it some sort of intended functionality? it sounds more like a bug in Apple SDK if it happens like that. Which iOS version you were trying it on?
– saurabh
Jan 3 '12 at 6:14
...
How can I keep Bootstrap popovers alive while being hovered?
... hi1.4xlarge and hs1.8xlarge.<br> More info: <a href=&quot;http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placement-groups.html&quot; target=&quot;_blank&quot;>Click here...</a>"
data-original-title="" title="">
HOVE...
Rails extending ActiveRecord::Base
...rt::Concern (Preferred)
Read the ActiveSupport::Concern documentation for more details.
Create a file called active_record_extension.rb in the lib directory.
require 'active_support/concern'
module ActiveRecordExtension
extend ActiveSupport::Concern
# add your instance methods here
def f...