diff --git a/.vscode/launch.json b/.vscode/launch.json new file mode 100644 index 00000000..2ba986f6 --- /dev/null +++ b/.vscode/launch.json @@ -0,0 +1,15 @@ +{ + // Use IntelliSense to learn about possible attributes. + // Hover to view descriptions of existing attributes. + // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387 + "version": "0.2.0", + "configurations": [ + { + "type": "chrome", + "request": "launch", + "name": "Launch Chrome against localhost", + "url": "http://localhost:8080", + "webRoot": "${workspaceFolder}" + } + ] +} \ No newline at end of file diff --git a/week-1/mandatory/2-classes-db/task.md b/week-1/mandatory/2-classes-db/task.md index 735de6ae..6507f55a 100644 --- a/week-1/mandatory/2-classes-db/task.md +++ b/week-1/mandatory/2-classes-db/task.md @@ -7,7 +7,28 @@ Below you will find a set of tasks for you to complete to consolidate and extend To submit this homework write the correct commands for each question here: ```sql +1- select * from rooms where rate > 100; +2- select * from reservations where checkin_date BETWEEN '2020-08-01' and '2020-09-01' and checkin_date + 3 < checkout_date; + +3- select * from customers where city like 'M%'; + +4- insert into room_types (room_type , def_rate) values ('PENTHOUSE', '185.00'); + +5- insert into rooms (room_no, rate, room_type) values ('501' ,'185.00', 'PENTHOUSE'), ('502' ,'185.00', 'PENTHOUSE'); + +6- insert into rooms (room_no, rate, room_type) values ('503' ,'143.00', 'PREMIER PLUS'); + +7- SELECT count(distinct room_no) FROM reservations WHERE checkin_date >= date_trunc('month', current_date - interval '1' month) and checkout_date < date_trunc('month', current_date); ===> or SELECT count(room_no) FROM reservations WHERE checkin_date >= date_trunc('month', current_date - interval '1' month); + +8- select sum(checkout_date - checkin_date) from reservations where room_no between '201' and '299'; + +9- select count(total) from invoices where total > 300; =>> number of invoices,,,,,, select AVG(total) from invoices where total > 300; ===> average ,,,,,, select sum(total) from invoices where total > 300; ==> total + +10- Floor1 ==> select sum(checkout_date - checkin_date) from reservations where room_no between '101' and '199'; +Floor2 ==> select sum(checkout_date - checkin_date) from reservations where room_no between '201' and '299'; +Floor3 ==> select sum(checkout_date - checkin_date) from reservations where room_no between '301' and '399'; +Floor4 ==> select sum(checkout_date - checkin_date) from reservations where room_no between '401' and '499'; ``` diff --git a/week-2/mandatory/2-ecommerce-db/task.md b/week-2/mandatory/2-ecommerce-db/task.md index c48d2286..c346c911 100644 --- a/week-2/mandatory/2-ecommerce-db/task.md +++ b/week-2/mandatory/2-ecommerce-db/task.md @@ -8,7 +8,33 @@ Below you will find a set of tasks for you to complete to set up a database for To submit this homework write the correct commands for each question here: ```sql +1- select name, address,country from customers where country = 'United States'; +2- select * from customers order by name asc; + +3- select * from products where product_name like '%socks%'; + +4- select pro.id, pro.product_name , pro_ava.unit_price , pro_ava.supp_id from products pro join product_availability pro_ava on (pro_ava.prod_id = pro.id) where pro_ava.unit_price > 100; + +5- select pro.product_name, available.prod_id, available.supp_id, available.unit_price from product_availability available join products pro on (available.prod_id = pro.id) order by unit_price desc limit 5; + +6- select pro.product_name , pro_avai.unit_price, supp.supplier_name from products pro join product_availability pro_avai on (pro_avai.prod_id = pro.id) join suppliers supp on (pro_avai.supp_id = supp.id); + +7- select pro.product_name , supp.supplier_name from products pro join product_availability pro_avai on(pro_avai.prod_id = pro.id) join suppliers supp on(pro_avai.supp_id = supp.id) where supp.country = 'United Kingdom'; + +8- select ord.id, ord.order_reference, ord.order_date, ord_i.quantity * pro_avai.unit_price as total_cost, ord.customer_id from orders ord join order_items ord_i on (ord_i.order_id = ord.id) join product_availability pro_avai on (pro_avai.prod_id = ord_i.product_id) where ord.customer_id = '1'; + +9- select ord.* ,ord_i.*, c.name from orders ord join order_items ord_i on (ord_i.order_id = ord.id) inner join customers c on (ord.customer_id = c.id) where c.name = 'Hope Crosby'; + +10- select pro.product_name , pro_avai.unit_price , ord_i.quantity from products pro join product_availability pro_avai on (pro_avai.prod_id = pro.id) join order_items ord_i on (pro.id = ord_i.product_id) join orders ord on (ord_i.order_id = ord.id) where ord.order_reference = 'ORD006'; + +11- select c.name, ord.order_reference , ord.order_date, pro.product_name, supp.supplier_name , ord_i.quantity from customers c join orders ord on ( ord.customer_id += c.id) join order_items ord_i on (ord_i.order_id = ord.id) join suppliers supp on (ord_i.supplier_id = supp.id) join products pro on (ord_i.product_id = pro.id); + +12- select c.name from customers c join orders ord on (ord.customer_id = c.id) join order_items ord_i on (ord_i.order_id = ord.id) join suppliers supp on (ord_i.supplier_id = supp.id) where supp.country = 'China'; + +13- select c.name , ord.order_reference , ord.order_date, ord_i.quantity * pro_avai.unit_price as total_amount from customers c join orders ord on (ord.customer_id +=c.id) join order_items ord_i on (ord_i.order_id = ord.id) join product_availability pro_avai on (pro_avai.prod_id = ord_i.product_id) order by total_amount desc; ``` diff --git a/week-2/mandatory/3-api/cyf-ecommerce-api/.gitignore b/week-2/mandatory/3-api/cyf-ecommerce-api/.gitignore new file mode 100644 index 00000000..b512c09d --- /dev/null +++ b/week-2/mandatory/3-api/cyf-ecommerce-api/.gitignore @@ -0,0 +1 @@ +node_modules \ No newline at end of file diff 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b/week-2/mandatory/3-api/cyf-ecommerce-api/package.json new file mode 100644 index 00000000..d42a887c --- /dev/null +++ b/week-2/mandatory/3-api/cyf-ecommerce-api/package.json @@ -0,0 +1,16 @@ +{ + "name": "cyf-ecommerce-api", + "version": "1.0.0", + "description": "", + "main": "index.js", + "scripts": { + "test": "echo \"Error: no test specified\" && exit 1" + }, + "author": "", + "license": "ISC", + "dependencies": { + "body-parser": "^1.19.0", + "express": "^4.17.1", + "pg": "^8.3.3" + } +} diff --git a/week-2/mandatory/3-api/cyf-ecommerce-api/server.js b/week-2/mandatory/3-api/cyf-ecommerce-api/server.js new file mode 100644 index 00000000..2ea0f15f --- /dev/null +++ b/week-2/mandatory/3-api/cyf-ecommerce-api/server.js @@ -0,0 +1,199 @@ +const express = require("express"); +const app = express(); +const bodyParser = require("body-parser"); +app.use(bodyParser.json()); + +const { Pool } = require('pg'); + +const db = new Pool({ + user: 'sulaiman', + host: 'localhost', + database: 'cyf_ecommerce', + password: '12133405', + port: 5432 +}); + +app.get("/customers", function(req, res) { + db.query("SELECT * FROM customers", + (error, result) => { + res.json(result.rows); + }); +}); + +app.get("/suppliers", function(req, res) { + db.query("SELECT * FROM suppliers", + (error, result) => { + res.json(result.rows); + }); +}); + + +app.get("/products", function(req, res) { + const query = "select prod.*, supp.supplier_name " + + "FROM products prod join " + + "product_availability a on (a.prod_id = prod.id) join" + + "suppliers supp on (a.supp_id = supp.id)"; + db.query(query, (err, result) => { + if (err == undefined) { + res.json(result.rows); + } else { + res.status(400).json(err); + } + }); + }); + + + +app.get("/customers/:id", function (req, res){ + let custId = Number(req.params.id) + db.query("SELECT * FROM customers WHERE id = $1", [custId], + function(err, result) { + res.json(result.rows); + }); +}) + + +app.post("/customers", function(req,res){ + const newName = req.body.name; + const newAddress = req.body.address; + const newCity = req.body.city; + const newCountry = req.body.country; + + const query = + "INSERT INTO customers (name, address, city, country) " + + "VALUES ($1, $2, $3, $4)"; + + db.query(query, [newName, newAddress,newCity, newCountry], (err) => { + res.send("Customer created."); +}) + +}); + +app.post("/products", function(req,res){ + const newProduct = req.body.product; + const query = + "INSERT INTO products (product_name) " + + "VALUES ($1)"; + + db.query(query, [newProduct], (err) => { + res.send("product added."); + }) +}) + + +app.post("/availability", function(req,res){ + const prodId = Number(req.body.prod_id) + const suppId = Number(req.body.supp_id); + const unitPrice = Number(req.body.unit_price); + + const query = + "INSERT INTO product_availability (prod_id, supp_id, unit_price) VALUES ($1, $2, $3)"; + + db.query(query, [prodId, suppId, unitPrice], (err) => { + if( unitPrice > 0){ + res.send("new product is available."); + } else { + res.send("cant add product with price less than 1!") + } + }) +}) + + + +app.post("/customers/:id/orders", function(req,res){ + const custId = Number(req.params.id); + const ordRef = req.body.orderRef; + + const query = "INSERT INTO orders (order_date, order_reference, customer_id) " + + " VALUES (current_date, $1, $2) "; +db.query(query, [ ordRef, custId], (err, result) => { +if (err == undefined) { +res.json("new order added"); +} else { +res.json(err); +} +}); +}) + +app.put("/customer/:id", function(req, res) { + const custId = Number(req.params.id); + const custName = req.body.name; + const custAddr = req.body.address; + const custCity = req.body.city; + const custCountry = req.body.country; + db.query("UPDATE customers SET name = $1, address = $2, city = $3, country = $4 WHERE id = $5", + [custName, custAddr, custCity, custCountry, custId], + (err) => { + if (err == undefined) { + res.send("Customer updated successfully!!!"); + } else { + res.status(500).json(err); + } + }); + }); + + app.delete("/orders/:id", function(req, res) { + const orderId = Number(req.params.id); + db.query("DELETE FROM order_items WHERE order_id = $1", [orderId], (err, result) => { + if (err == undefined) { + db.query("DELETE FROM orders WHERE id = $1", [orderId], (err, result) => { + if (err == undefined) { + if (result.rowCount == 0) { + res.status(400).send("No order with that id found."); + } else { + res.status(200).send(`Order number ${orderId} is deleted along with its items`); + } + } + }); + } else { + res.json(err); + } + + }); + }); + + app.delete("/customers/:id", function(req, res) { + const custId = Number(req.params.id); + db.query("SELECT 1 FROM orders WHERE customer_id = $1", [custId], (err, result) => { + if (err == undefined) { + if (result.rowCount > 0) { + res.status(400).send(`Cannot delete customer (${custId}) : orders exist for that customer.`); + } else { + db.query("DELETE FROM customers WHERE id = $1", [custId], (err, result) => { + if (err == undefined) { + res.status(200).send(`Customer (${custId}) deleted!`); + } else { + res.status(404).send(`Customer (${custId}) not found.`) + } + + }); + } + } else { + res.status(500).json(err); + } + }); + }); + + + app.get("/customers/:id/orders", function(req, res) { + const custId =Number(req.params.id); + db.query("SELECT o.order_reference, o.order_date, p.product_name, a.unit_price, s.supplier_name, i.quantity " + + "FROM orders o JOIN " + + "order_items i ON (i.order_id = o.id) JOIN " + + "product_availability a ON (a.prod_id = i.product_id AND a.supp_id = i.supplier_id) JOIN " + + "products p ON (p.id = a.prod_id) JOIN " + + "suppliers s ON (s.id = a.supp_id) " + + "WHERE o.customer_id = $1 " + + "ORDER BY o.order_reference", [custId], (err, result) => { + if (err == undefined) { + res.status(200).json(result.rows); + } else { + res.status(500).json(err); + } + }); + }); + + +app.listen(3000, function() { + console.log("Server is listening on port 3000. Ready to accept requests!"); +});