Tutorial by Examples: el

Install in Eclipse and Build Hello World

(Tested with ANTLR 4.5.3, Eclipse Neon, ANTLR 4 IDE 0.3.5, and Java 1.8) Download the latest ANTLR. Make sure to get the complete ANTLR Java binaries jar. Save to any appropriate location, for example the folder where other Java libraries are stored. It doesn’t matter where, just remember the loc...

Difference between Tk and Toplevel

Tk is the absolute root of the application, it is the first widget that needs to be instantiated and the GUI will shut down when it is destroyed. Toplevel is a window in the application, closing the window will destroy all children widgets placed on that window{1} but will not shut down the program...

Hello World Firebase Realtime Database in Node

System Requirements: Node JS Getting Started First Go to Firebase Console and Create New Project. After Creating the project, in project click on settings icon besides project Name in left sidebar and select Permissions. On Permissions Page Click on Service accounts in left sidebar then c...

Text Boxes and Labels

Text box controls are typically used to accept input from the user. A text box control can accept one or more lines of text depending upon the settings of the TextMode attribute. Label controls provide an easy way to display text which can be changed from one execution of a page to the next. If you...

Hello world

Initial starting point for iron-data-table. Working jsBin <!DOCTYPE html> <html> <head> <base href="https://polygit.org/polymer+:master/iron-data-table+Saulis+:master/components/"> <link rel="import" href="polymer/polymer.html&quo...

Edit row details using sub-element

This example uses a separate element to edit bound data to the row-detail template. Working jsBin <!DOCTYPE html> <html> <head> <base href="https://polygit.org/polymer+:master/iron-data-table+Saulis+:master/components/"> <link rel="import&q...

Select row, prevent deselection

Default behavior is to de-select row when clicked twice. In some use cases, you might want to disable this de-selecting behavior. Note table.deselectItem(item) method will imperatively deselect an item. This works with both item or index (when using items array) as an argument. Working jsBin &lt...

Hello World

start Octave by running the command octave (the executable should be in your path) type disp('Hello, World!') at the Octave command prompt >> disp('Hello, World!') Hello, World!

One To One relation between employee and desk

Consider a one to one bidirectional relationship between employee and desk. Employee.java @Entity public class Employee { @TableGenerator(name = "employee_gen", table = "id_gen", pkColumnName = "gen_name", valueColumnName = "gen_val", allocationSize...

Basic commands on mongo shell

Show all available databases: show dbs; Select a particular database to access, e.g. mydb. This will create mydb if it does not already exist: use mydb; Show all collections in the database (be sure to select one first, see above): show collections; Show all functions that can be used w...

PlayerMoveListener

public class PlayerMoveListener implements Listener { @EventHandler public void onPlayerMove(PlayerMoveEvent evt) { Location from = evt.getFrom(); Location to = evt.getTo(); double xFrom = from.getX(); double yFrom = from.getY(); double zFrom ...

Find all elements with a certain attribute

Imagine the following XML: <root> <element foobar="hello_world" /> <element example="this is one!" /> </root> /root/element[@foobar] and will return the <element foobar="hello_world" /> element.

Find all elements with a certain attribute value

Imagine the following XML: <root> <element foobar="hello_world" /> <element example="this is one!" /> </root> The following XPath expression: /root/element[@foobar = 'hello_world'] will return the <element foobar="hello_world&quo...

Neglect a few fields

Let's say you don't want the fields houseNum and street in the address field of the final populated doc, use the populate() as follows, Person.findOne({_id: req.params.id}) .populate('address', '-houseNum -street') // note the `-` symbol .exec(function(err, person) { // do somet...

Populate only a few fields

If you only want the fields houseNum and street in the address field in the final populated doc, use the populate() function as follows in the above two methods, Person.findOne({_id: req.params.id}) .populate('address', 'houseNum street') .exec(function(err, person) { // do somet...

Model Validation with Custom Attribute

If the built in attributes are not sufficient to validate your model data, then you can place your validation logic in a class derived from ValidationAttribute. In this example only odd numbers are valid values for a model member. Custom Validation Attribute public class OddNumberAttribute : Valid...

Setting up tools for development

When you are getting started with ElasticSearch (ES) it might be good to have a graphical tool that helps you explore your data. A plugin called elasticsearch-head does just that. To install it, do the following: Find out in which folder ES is installed: ls -l $(which elasticsearch) cd into this...

Select nodes based on child count

Sample XML <Students> <Student> <Name> <First>Ashley</First> <Last>Smith</Last> </Name> <Grades> <Exam1>A</Exam1> <Exam2>B</Exam2> ...

Select nodes based on specific child node

Sample XML <Students> <Student> <Name> <First>Ashley</First> <Last>Smith</Last> </Name> <Grades> <Exam1>A</Exam1> <Exam2>B</Exam2> ...

Create Database Link

Let we assume we have two databases "ORA1" and "ORA2". We can access the objects of "ORA2" from database "ORA1" using a database link. Prerequisites: For creating a private Database link you need a CREATE DATABASE LINK privilege. For creating a private Data...

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