#12 add mysql-resource.

nodejs/app4/classexample/business_person.js

@@ -0,0 +1,13 @@
+const { Person } = require("./iface/person");
+
+module.exports = class BusinessPerson extends Person {
+    constructor(name, age, country, job) {
+        super(name, age, country);
+        this.job = job
+    }
+
+    sayHello() {
+        super.sayHello();
+        console.log(`I'm work as ${this.job}.`);
+    }
+}

nodejs/app4/classexample/iface/person.js

@@ -0,0 +1,16 @@
+ class Person {
+    constructor(name, age, country) {
+        this.name = name;
+        this.age = age;
+        this.country = country;
+    }
+
+    sayHello() {
+        console.log(`Hello, my name is ${this.name}.`);
+        console.log(`I'm ${this.age} years old.`);
+        console.log(`I'm live in ${this.country}.`);
+    }
+}
+
+module.exports = { Person };
+

nodejs/app4/classexample/main.js

@@ -0,0 +1,5 @@
+const BusinessPerson = require("./business_person");
+
+
+let bzp = new BusinessPerson("satoshi", 14, "Japan", "Student");
+bzp.sayHello();

nodejs/app5/connectmysql/delete_data_main.js

@@ -0,0 +1,24 @@
+const mysql = require('mysql')
+
+const conn = mysql.createConnection({
+    host: 'localhost',
+    user: 'root',
+    password: 'password',
+    database: 'employee_db'
+});
+
+conn.connect((err) => {
+    if (err) {
+        console.log('connection establish is failed.' + err.stack());
+        return;
+    }
+    console.log('connection established.');
+});
+
+conn.query('DELETE FROM users WHERE id=?',
+  [5], (error, results) => {
+    console.log(results);
+  }
+);
+
+console.log('deleting data is success.');

nodejs/app5/connectmysql/insert_data_main.js

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+const mysql = require('mysql')
+
+const conn = mysql.createConnection({
+    host: 'localhost',
+    user: 'root',
+    password: 'password',
+    database: 'employee_db'
+});
+
+conn.connect((err) => {
+    if (err) {
+        console.log('connection failed. ' + err.stack);
+        return;
+    }
+    console.log('connection success.');
+});
+
+conn.query('INSERT INTO users(id, department_id, email, first_name, last_name) VALUES (?,?,?,?,?)'
+    , [5, '1', '[email protected]', 'J.M', 'Weston'], (error, results) => {
+    console.log(results);
+})
+