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How to create a MySQL hierarchical recursive query
...s, path IDs, or self-joins.
MySQL 8+
with recursive cte (id, name, parent_id) as (
select id,
name,
parent_id
from products
where parent_id = 19
union all
select p.id,
p.name,
p.parent_id
from products p
inn...
Detecting when the 'back' button is pressed on a navbar
...(the NavigationController) with the help of willMoveToParentViewController(_:) OR didMoveToParentViewController()
If parent is nil, the view controller is being popped off the navigation stack and dismissed. If parent is not nil, it is being added to the stack and presented.
// Objective-C
-(void...
Is there a way to programmatically scroll a scroll view to a specific edit text?
...
private final void focusOnView(){
your_scrollview.post(new Runnable() {
@Override
public void run() {
your_scrollview.scrollTo(0, your_EditBox.getBottom());
}
});
}
...
Converting from a string to boolean in Python?
...
Use:
bool(distutils.util.strtobool(some_string))
Python 2: http://docs.python.org/2/distutils/apiref.html?highlight=distutils.util#distutils.util.strtobool
Python 3: https://docs.python.org/3/distutils/apiref.html#distutils.util.strtobool
True values are y...
How to create abstract properties in python abstract classes
... (python docs):
class C(ABC):
@property
@abstractmethod
def my_abstract_property(self):
...
Python 2: (python docs)
class C(ABC):
@abstractproperty
def my_abstract_property(self):
...
...
Unicode equivalents for \w and \b in Java regular expressions?
.... That way, a regex like \w+ matches words like hello , élève , GOÄ_432 or gefräßig .
3 Answers
...
How does Stack Overflow generate its SEO-friendly URLs?
...',' || c == '.' || c == '/' ||
c == '\\' || c == '-' || c == '_' || c == '=')
{
if (!prevdash && sb.Length > 0)
{
sb.Append('-');
prevdash = true;
}
}
else if ((int)c >= 128)
...
Allowed characters in filename [closed]
...X "Fully portable filenames" entry, which lists these: A–Z a–z 0–9 . _ -
– Vladimir Kornea
Jul 2 '14 at 22:31
1
...
Reading InputStream as UTF-8
...BufferedReader(new InputStreamReader(url.openStream(), StandardCharsets.UTF_8));
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What does “%” (percent) do in PowerShell?
...at the % operation starts script blocks after the pipeline, although about_Script_Blocks indicates the % isn't necessary.
...