created todo app with database

.gitignore

@@ -27,3 +27,4 @@ website.db
 *.c9
 
 messages.txt
+todo.db

exercises/07_unit_testing/database/index.js

@@ -0,0 +1,61 @@
+#!/usr/bin/env node
+
+'use strict'
+
+const Koa = require('koa')
+const Router = require('koa-router')
+const stat = require('koa-static')
+const bodyParser = require('koa-bodyparser')
+const handlebars = require('koa-hbs-renderer')
+
+const app = new Koa()
+const router = new Router()
+app.use(stat('public'))
+app.use(bodyParser())
+app.use(handlebars({ paths: { views: `${__dirname}/views` } }))
+app.use(router.routes())
+
+const port = 8080
+const dbName = 'todo.db'
+
+const ToDo = require('./modules/todo')
+
+router.get('/', async ctx => {
+	try {
+		const todo = await new ToDo(dbName)
+		const data = {}
+		if(ctx.query.msg) data.msg = ctx.query.msg
+		data.items = await todo.getAll()
+		console.log('all records')
+		console.log(data)
+		ctx.render('home', data)
+	} catch(err) {
+		console.log(err.message)
+		ctx.render('home', {msg: err.message})
+	}
+})
+
+router.post('/', async ctx => {
+	try {
+		const todo = await new ToDo(dbName)
+		const body = ctx.request.body
+		todo.add(body.item, body.qty)
+		ctx.redirect('/')
+	} catch(err) {
+		console.log(err.message)
+		ctx.redirect(`/?msg=${err.message}`)
+	}
+})
+
+router.get('/delete/:key', ctx => {
+	try {
+		console.log(`key: ${ctx.params.key}`)
+		todo.delete(ctx.params.key)
+		ctx.redirect('/msg=item deleted')
+	} catch(err) {
+		console.log(err.message)
+		ctx.redirect(`/${err.message}`)
+	}
+})
+
+module.exports = app.listen(port, () => console.log(`listening on port ${port}`))

exercises/07_unit_testing/database/modules/todo.js

@@ -0,0 +1,45 @@
+
+'use strict'
+
+const sqlite = require('sqlite-async')
+
+module.exports = class ToDo {
+
+	constructor(dbName = ':memory:') {
+		return (async() => {
+			this.db = await sqlite.open(dbName)
+			const sql = 'CREATE TABLE IF NOT EXISTS items(id INTEGER PRIMARY KEY AUTOINCREMENT, item TEXT, qty NUMERIC)'
+			await this.db.run(sql)
+			return this
+		})()
+	}
+
+	async add(item, qty) {
+		qty = Number(qty)
+		if(isNaN(qty)) throw new Error('the quantity must be a number')
+		const sql = `INSERT INTO items(item, qty) VALUES("${item}", ${qty})`
+		await this.db.run(sql)
+	}
+
+	async getAll() {
+		const sql = 'SELECT * FROM items'
+		const data = await this.db.all(sql)
+		console.log(data)
+		return data
+	}
+
+	async delete(id) {
+		const sql = `DELETE FROM items WHERE id=${id}`
+		await this.db.run(sql)
+	}
+
+	async countItems() {
+		const sql = 'SELECT COUNT(*) as items FROM items'
+		const data = await this.db.get(sql)
+		return data
+	}
+
+}
+
+// https://stackoverflow.com/questions/43431550/async-await-class-constructor
+// https://www.sqlite.org/inmemorydb.html

exercises/07_unit_testing/database/package.json

@@ -0,0 +1,19 @@
+{
+  "name": "database",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "koa": "^2.8.1",
+    "koa-bodyparser": "^4.2.1",
+    "koa-hbs-renderer": "^1.2.0",
+    "koa-router": "^7.4.0",
+    "koa-static": "^5.0.0",
+    "sqlite-async": "^1.0.12"
+  }
+}

exercises/07_unit_testing/database/public/style.css

@@ -0,0 +1,11 @@
+
+body {
+  font-family: Arial, Helvetica, sans-serif;
+}
+
+.msg {
+  border: 1px solid red;
+  font-weight: bold;
+  color: red;
+  padding: 1em;
+}

exercises/07_unit_testing/database/sqlite-async.js

@@ -0,0 +1,33 @@
+
+'use strict'
+/*
+const sqlite = require('sqlite-async')
+const db = await sqlite.open('./website.db')
+await db.run('xxx')
+const records = await db.get('xxx')
+await db.close()
+*/
+
+module.exports.open = async name => {
+	// opens a connection
+	console.log(name)
+	return new DB()
+}
+
+class DB {
+	async run(query) {
+		// runs a query
+		console.log('run')
+		console.log(query)
+	}
+	async get(query) {
+		// runs a query and returns data
+		console.log('get')
+		console.log(query)
+		return ['bread', 'butter', 'cheese']
+	}
+	async close() {
+		// closes the connection
+		console.log('close')
+	}
+}

exercises/07_unit_testing/database/views/home.hbs

@@ -0,0 +1,33 @@
+
+<!DOCTYPE html>
+<html>
+	<head>
+		<title>ToDo List</title>
+		<link rel="stylesheet" href="style.css" />
+	</head>
+	<body>
+		<h1>ToDo List</h1>
+		<h2>My List</h2>
+		{{#if msg}}
+ 			<p class="msg">{{msg}}</p>
+		{{/if}}
+		{{#if items.length}}
+    <table>
+	    <caption>Shopping List</caption>
+	    <tr><th>Item</th><th>Qty</th><th>Action</th></tr>
+	      {{#each items}}
+		      <tr><td>{{this.item}}</td><td>{{this.qty}}</td><td><a href="/delete/{{this.key}}">delete</a></td></tr>
+				{{/each}}
+    </table>
+		{{else}}
+		<h2>Your list is empty, lets add some items...</h2>
+		{{/if}}
+		<form method="post" action="/">
+			Item:
+			<input type="text" name="item" />
+			Qty:
+			<input type="text" name="qty" />
+			<input type="submit" value="Add Item" />
+		</form>
+	</body>
+</html>