¡No podía faltar en este blog una explicación de los patrones de diseño! Este artículo hará de enlace y listado de los patrones de diseño básicos que existen, para que puedas ir a estudiar cada uno de ellos y entender cómo funcionan. Pero además, quería hablarte un poco de qué son los patrones y por […]
SQL BASIC COMMANDS
CONCAT : SELECT CONCAT(Address, ” “, PostalCode, ” “, City) AS Address FROM Customers; CONVERT TEXT TO LOWER TEXT. SELECT LCASE(“SQL Tutorial is FUN!”); SELECT TRIM(” SQL Tutorial “) AS TrimmedString; The INNER JOIN keyword selects records that have matching values in both tables. SELECT column_name(s) FROM table1 INNER JOIN table2 ON table1.column_name = table2.column_name; THREE TABLES: SELECT Orders.OrderID, Customers.CustomerName, Shippers.ShipperName FROM ((Orders INNER JOIN Customers ON Orders.CustomerID = Customers.CustomerID) INNER JOIN Shippers ON Orders.ShipperID = Shippers.ShipperID); LEFT SELECT column_name(s) FROM table1 LEFT JOIN table2 ON table1.column_name = table2.column_name; RIGHT SELECT column_name(s) […]
Simple JAVA FORM.
KEEP IT SIMPLE.. package ej3; import java.awt.Dimension; import java.awt.FlowLayout; import java.awt.Insets; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JTextField; public class botones implements ActionListener{//implementando el listener de eventos JButton bt1;//creando variables globales de los botones JLabel jl1, jl2, jl3;//creando variables globales para las etiquetas JTextField jt1, jt2, jt3;//creando variables globales para […]
AngularJS .. ReactJS
What are Angular and React? That’s a great history of JavaScript! So why are we hearing so much about Angular and React? Are these JavaScript frameworks? There’s a question as to whether or not Angular and React are frameworks. They’re usually included in lists of popular JavaScript frameworks, but React itself is very adamant that […]
CREATE REUSABLE COMPONENTS
import React, { Component } from “react”; class Button extends React.Component { handleClick = () => { this.props.onClickFunction(this.props.incrementValue); }; render() { return ( <button onClick={this.handleClick}> +{this.props.incrementValue} </button> ); } } const Result = props => { return ( <div> {props.counter} </div> ); }; class App extends React.Component { state = { counter: 0 }; incrementCounter […]