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How do I implement interfaces in python?
...interface, a module that is a part of the Zope Component Architecture, a really awesomely cool component framework. Here you don't subclass from the interfaces, but instead mark classes (or even instances) as implementing an interface. This can also be used to look up components from a component reg...
Android EditText delete(backspace) key event
...ction class. This method is called when key events occur in an IME. But in order to override this, we need to implement a custom EditText which overrides the onCreateInputConnection method, wrapping the default InputConnection object in a proxy class! :|
Sounds complicated, but here's the simplest ...
What columns generally make good indexes?
...nto your tables:
Only index those columns that are required in WHERE and ORDER BY clauses. Indexing columns in abundance will result in some disadvantages.
Try to take benefit of "index prefix" or "multi-columns index" feature of MySQL. If you create an index such as INDEX(first_name, last_name),...
Spring Boot application as a Service
...
For a proper boot sequence you might want to add ordering statements to the [Unit] section, e.g. After=mysql.service, Before=apache2.service.
– rustyx
Jan 25 at 9:41
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How to implement has_many :through relationships with Mongoid and mongodb?
...seful with MongoDB because it does not support join queries. Therefore, in order to model a many-many relationship in a non-RDBMS database like MongoDB, you use a field containing an array of 'foreign' keys on either side.
class Contact
include Mongoid::Document
has_and_belongs_to_many :practic...
Is False == 0 and True == 1 an implementation detail or is it guaranteed by the language?
.....] Boolean values behave like the values 0 and 1, respectively, in almost all contexts, the exception being that when converted to a string, the strings "False" or "True" are returned, respectively.
There is also, for Python 2:
In numeric contexts (for example when used as the argument to an ...
What is the meaning of single and double underscore before an object name?
...at least two leading underscores, at most one trailing underscore) is textually replaced with _classname__spam, where classname is the current class name with leading underscore(s) stripped. This mangling is done without regard to the syntactic position of the identifier, so it can be used to define...
Is 1.0 a valid output from std::generate_canonical?
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How can I find which tables reference a given table in Oracle SQL Developer?
...in ('P', 'U')
and table_name = :r_table_name
and owner = :r_owner
)
order by table_name, constraint_name
Where r_owner is the schema, and r_table_name is the table for which you are looking for references. The names are case sensitive
Be careful because on the reports tab of Oracle SQL D...
What's “tools:context” in Android layout files?
...ction; an activity can call setContentView(layout) to display a layout) in order to drive certain features.
Right now, we're using it for one thing only: Picking the right theme to show for a layout (since the manifest file can register themes to use for an activity, and once we know the activity a...