A shell script is a very versatile way to extend your build to basically anything you can think of.
As an exmaple, here is a simple script to compile protobuf files and add the result java files to the source directory for further compilation:
def compilePb() {
exec {
// NOTICE: grad...
With the rgdal package it is possible to import and export shapfiles with R.
The function readOGR can be used to imports shapfiles. If you want to import a file from e.g. ArcGIS the first argument dsn is the path to the folder which contains the shapefile. layer is the name of the shapefile without...
The packages foreign and haven can be used to import and export files from a variety of other statistical packages like Stata, SPSS and SAS and related software. There is a read function for each of the supported data types to import the files.
# loading the packages
library(foreign)
library(have...
The class we are going to test is:
public class Service {
private Collaborator collaborator;
public Service(Collaborator collaborator) {
this.collaborator = collaborator;
}
public String performService(String input) {
return collaborator.transformStri...
Enumerable is the most popular module in Ruby. Its purpose is to provide you with iterable methods like map, select, reduce, etc. Classes that use Enumerable include Array, Hash, Range.
To use it, you have to include Enumerable and implement each.
class NaturalNumbers
include Enumerable
de...
Comparable is one of the most popular modules in Ruby. Its purpose is to provide with convenience comparison methods.
To use it, you have to include Comparable and define the space-ship operator (<=>):
class Rectangle
include Comparable
def initialize(a, b)
@a = a
@b = b
...
DELETE FROM `table_name` WHERE `field_one` = 'value_one'
This will delete all rows from the table where the contents of the field_one for that row match 'value_one'
The WHERE clause works in the same way as a select, so things like >, <, <> or LIKE can be used.
Notice: It is necessa...
DELETE FROM table_name ;
This will delete everything, all rows from the table. It is the most basic example of the syntax. It also shows that DELETE statements should really be used with extra care as they may empty a table, if the WHERE clause is omitted.
DELETE FROM `table_name` WHERE `field_one` = 'value_one' LIMIT 1
This works in the same way as the 'Delete with Where clause' example, but it will stop the deletion once the limited number of rows have been removed.
If you are limiting rows for deletion like this, be aware that it will delete th...
Statement-level parallel hints are the easiest:
SELECT /*+ PARALLEL(8) */ first_name, last_name FROM employee emp;
Object-level parallel hints give more control but are more prone to errors; developers often forget to use the alias instead of the object name, or they forget to include some objec...
There are few approaches available there:
You can subscribe for keyboard appearance events notifications and change offset manually:
//Swift 2.0+
override func viewDidLoad() {
super.viewDidLoad()
NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(YourVCClas...
Controller class names are pluralized. The reason is the controller controls multiple instances of object instance.
For Example: OrdersController would be the controller for an orders table. Rails will then look for the class definition in a file called orders_controller.rb in the /app/controllers ...
Common usage of lock is a critical section.
In the following example ReserveRoom is supposed to be called from different threads. Synchronization with lock is the simplest way to prevent race condition here. Method body is surrounded with lock which ensures that two or more threads cannot execute i...
An alternative to extending Enumeration is using sealed case objects:
sealed trait WeekDay
object WeekDay {
case object Mon extends WeekDay
case object Tue extends WeekDay
case object Wed extends WeekDay
case object Thu extends WeekDay
case object Fri extends WeekDay
case objec...
Creating a Snackbar can be done as follows:
Snackbar.make(view, "Text to display", Snackbar.LENGTH_LONG).show();
The view is used to find a suitable parent to use to display the Snackbar. Typically this would be a CoordinatorLayout that you've defined in your XML, which enables adding ...
The String List passed as a parameter to the share() method contains the paths of all the files you want to share.
It basically loops through the paths, adds them to Uri, and starts the Activity which can accept Files of this type.
public static void share(AppCompatActivity context,List<Strin...
Swift
let alert = UIAlertController(title: "Hello",
message: "Welcome to the world of iOS",
preferredStyle: UIAlertControllerStyle.alert)
let defaultAction = UIAlertAction(title: "OK", style: UIAlertActionS...
With UIAlertController, action sheets like the deprecated UIActionSheet are created with the same API as you use for AlertViews.
Simple Action Sheet with two buttons
Swift
let alertController = UIAlertController(title: "Demo", message: "A demo with two buttons", preferredStyle...
You may want to create a duplicate of a table:
CREATE TABLE ClonedEmployees AS SELECT * FROM Employees;
You can use any of the other features of a SELECT statement to modify the data before passing it to the new table. The columns of the new table are automatically created according to the selec...
