大约有 23,000 项符合查询结果（耗时：0.0448秒） [XML]
Get all table names of a particular database by SQL query?
I am working on application which can deal with multiple database servers like "MySQL" and "MS SQL Server".
19 Answers
...
Can C++ code be valid in both C++03 and C++11 but do different things?
....
size_t s = list.size(); // Might be an O(n) operation in C++03
std::ios_base::failure does not derive directly from std::exception anymore
While the direct base-class is new, std::runtime_error is not. Thus:
try {
std::cin >> variable; // exceptions enabled, and error here
} catch(std::...
Does Python have an ordered set?
...
There is also "orderedset" package which is based on the same recipe but implemented in Cython -- pypi.python.org/pypi/orderedset .
– mbdevpl
Aug 31 '16 at 11:17
...
Should I use SVN or Git? [closed]
...gs to an external server.
SVN is designed to be more central where Git is based on each user having their own Git repo and those repos push changes back up into a central one. For that reason, Git gives individuals better local version control.
Meanwhile you have the choice between TortoiseGit, G...
Locking a file in Python
...olutions online, but most fail for my purposes as they are often only Unix based or Windows based.
13 Answers
...
UIImagePickerController breaks status bar appearance
In my .plist file, I have " View controller-based status bar appearance " set to NO . But after UIImagePickerController , my app behaves as if the option is set to YES .
...
Determine what attributes were changed in Rails after_save callback?
... 5.1+
Use saved_change_to_published?:
class SomeModel < ActiveRecord::Base
after_update :send_notification_after_change
def send_notification_after_change
Notification.send(…) if (saved_change_to_published? && self.published == true)
end
end
Or if you prefer, saved_chang...
Sharing Test code in Maven
...
Thanks for the base module suggestion. However, I'd rather not create a new module for just this purpose.
Found an acceptable answer in the Surefire Maven documentation and a blog. See also "How to create a jar containing test classes".
...
This type of CollectionView does not support changes to its SourceCollection from a thread different
...
public AsyncObservableCollection(IEnumerable<T> list)
: base(list)
{
}
protected override void OnCollectionChanged(NotifyCollectionChangedEventArgs e)
{
if (SynchronizationContext.Current == _synchronizationContext)
{
// Execute the Col...
Percentage width child element in absolutely positioned parent on Internet Explorer 7
...n, one of which is a relatively positioned div . When I use a percentage-based width on the child div , it collapses to 0 width on IE7, but not on Firefox or Safari.
...