diff --git a/week-1/mandatory/2-classes-db/cyf_classes.sql b/week-1/mandatory/2-classes-db/cyf_classes.sql new file mode 100644 index 00000000..c23103e0 --- /dev/null +++ b/week-1/mandatory/2-classes-db/cyf_classes.sql @@ -0,0 +1,51 @@ +CREATE TABLE mentors ( +id SERIAL PRIMARY KEY, +name VARCHAR(30) NOT NULL, +address VARCHAR(120), +years_in_Glascow INT NOT NULL, +fav_prog_language VARCHAR(30)); + + + +CREATE TABLE classes( + id SERIAL PRIMARY KEY, + mentor_name VARCHAR(30), + module VARCHAR(30), + course_date DATE NOT NULL, + course_location VARCHAR(30)); + + +CREATE TABLE students ( + id SERIAL PRIMARY KEY, + name VARCHAR(30) NOT NULL, + address VARCHAR(120), + CYF_graduate VARCHAR(30), + classes_id INT REFERENCES classes (id)); + + + +INSERT INTO mentors (name, address, years_in_Glascow,fav_prog_language) VALUES ('James Brown', '125 Barker St, MK112AA',6,'Python'); +INSERT INTO mentors (name, address, years_in_Glascow,fav_prog_language) VALUES ('Billi Jean', '5 George St,B12UF',11,'Javascript'); +INSERT INTO mentors (name, address, years_in_Glascow,fav_prog_language) VALUES ('Sara Major', '13 Prince Rd,DL62GH',2,'Java'); +INSERT INTO mentors (name, address, years_in_Glascow,fav_prog_language) VALUES ('Mark Twain', '133 Elzabeth Rd,GL11BD',23,'C++'); +INSERT INTO mentors (name, address, years_in_Glascow,fav_prog_language) VALUES ('Mel Gibson', '12 Gibson St,GL23FK',13,'HTML'); + + +INSERT INTO STUDENTS (name,address,CYF_graduate) VALUES ('kanye west','56 Rood End Rood, B665FG ','Yes'); +INSERT INTO STUDENTS (name,address,CYF_graduate) VALUES ('kim Lee','56 Moat Road, B562Gl ','Yes'); +INSERT INTO STUDENTS (name,address,CYF_graduate) VALUES ('Brian McNight','20 Cross Street, WS110BZ ','No'); +INSERT INTO STUDENTS (name,address,CYF_graduate) VALUES ('Sam Cook','29 Briage Street, WS110DQ ','yes'); +INSERT INTO STUDENTS (name,address,CYF_graduate) VALUES ('Herman Cooper','97 Loxley Road, CV359JY ','yes'); +INSERT INTO STUDENTS (name,address,CYF_graduate) VALUES ('North Hampton','1 Crispin Street, NN12JH','No'); +INSERT INTO STUDENTS (name,address,CYF_graduate) VALUES ('Barton Smith','87 Finchfiels Road, WV39LQ','Yes'); +INSERT INTO STUDENTS (name,address,CYF_graduate) VALUES ('Simone Malanga','56 Ashworth Road, WS115DS','Yes'); +INSERT INTO STUDENTS (name,address,CYF_graduate) VALUES ('Bobby Brown','51 Overdale Road, TF34BX','No'); +INSERT INTO STUDENTS (name,address,CYF_graduate) VALUES ('Mathew Perry','10 Mathew Street, L34AA','Yes'); + + + INSERT INTO classes(mentor_name , module ,course_date , course_location ) VALUES ('Rody Kirwan','React', '2019-10-01','West Midland'); + INSERT INTO classes(mentor_name , module ,course_date , course_location ) VALUES ('Jason Sancho','Javascript', '2019-11-05','West Midland'); + INSERT INTO classes(mentor_name , module ,course_date , course_location ) VALUES ('Andrew Jackson','Node', '2019-07-02','London'); + INSERT INTO classes(mentor_name , module ,course_date , course_location ) VALUES ('Stella Markov','HTML', '2019-02-07','Manchester'); + INSERT INTO classes(mentor_name , module ,course_date , course_location ) VALUES ('Sandeep Singh','CSS', '2019-03-09','Glascow'); + diff --git a/week-1/mandatory/2-classes-db/task.md b/week-1/mandatory/2-classes-db/task.md index be8b7cf0..84e2f3ce 100644 --- a/week-1/mandatory/2-classes-db/task.md +++ b/week-1/mandatory/2-classes-db/task.md @@ -8,6 +8,112 @@ To submit this homework write the correct commands for each question here: ```sql +//CREATE DATABASE +createdb -p 5432 -U postgres cyf_classes + +//LOG IN TO DATABASE +psql cyf_classes + +//CREATE mentors TABLE + +CREATE TABLE mentors ( +id SERIAL PRIMARY KEY, +name VARCHAR(30) NOT NULL, +address VARCHAR(120), +years_in_Glascow INT NOT NULL, +fav_prog_language VARCHAR(30)); + +// verifying mentors Table created + +\d mentors + +//inserting mentors + +INSERT INTO mentors (name, address, years_in_Glascow,fav_prog_language) VALUES ('James Brown', '125 Barker St, MK112AA',6,'Python'); +INSERT INTO mentors (name, address, years_in_Glascow,fav_prog_language) VALUES ('Billi Jean', '5 George St,B12UF',11,'Javascript'); +INSERT INTO mentors (name, address, years_in_Glascow,fav_prog_language) VALUES ('Sara Major', '13 Prince Rd,DL62GH',2,'Java'); +INSERT INTO mentors (name, address, years_in_Glascow,fav_prog_language) VALUES ('Mark Twain', '133 Elzabeth Rd,GL11BD',23,'C++'); +INSERT INTO mentors (name, address, years_in_Glascow,fav_prog_language) VALUES ('Mel Gibson', '12 Gibson St,GL23FK',13,'HTML'); + + +//verifying entries for mentors + SELECT * FROM mentors; + +//Create Table students + +CREATE TABLE students (id SERIAL PRIMARY KEY, name VARCHAR(30) NOT NULL,address VARCHAR(120),CYF_graduate VARCHAR(30)); + +//verifying Students Table created + +\d students + +// Inserting students + +INSERT INTO STUDENTS (name,address,CYF_graduate) VALUES ('kanye west','56 Rood End Rood, B665FG ','Yes'); +INSERT INTO STUDENTS (name,address,CYF_graduate) VALUES ('kim Lee','56 Moat Road, B562Gl ','Yes'); +INSERT INTO STUDENTS (name,address,CYF_graduate) VALUES ('Brian McNight','20 Cross Street, WS110BZ ','No'); +INSERT INTO STUDENTS (name,address,CYF_graduate) VALUES ('Sam Cook','29 Briage Street, WS110DQ ','yes'); +INSERT INTO STUDENTS (name,address,CYF_graduate) VALUES ('Herman Cooper','97 Loxley Road, CV359JY ','yes'); +INSERT INTO STUDENTS (name,address,CYF_graduate) VALUES ('North Hampton','1 Crispin Street, NN12JH','No'); +INSERT INTO STUDENTS (name,address,CYF_graduate) VALUES ('Barton Smith','87 Finchfiels Road, WV39LQ','Yes'); +INSERT INTO STUDENTS (name,address,CYF_graduate) VALUES ('Simone Malanga','56 Ashworth Road, WS115DS','Yes'); +INSERT INTO STUDENTS (name,address,CYF_graduate) VALUES ('Bobby Brown','51 Overdale Road, TF34BX','No'); +INSERT INTO STUDENTS (name,address,CYF_graduate) VALUES ('Mathew Perry','10 Mathew Street, L34AA','Yes'); + +//verifying entries for students + + SELECT * FROM students; + +//classes Table created + +CREATE TABLE classes(id SERIAL PRIMARY KEY, mentor_name VARCHAR(30), module VARCHAR(30),course_date DATE NOT NULL, course_location VARCHAR(30)); + +//Verify classes table created + +\d classes + +//Insert entries to classes table + + INSERT INTO classes(mentor_name , module ,course_date , course_location ) VALUES ('Rody Kirwan','React', '2019-10-01','West Midland'); + INSERT INTO classes(mentor_name , module ,course_date , course_location ) VALUES ('Jason Sancho','Javascript', '2019-11-05','West Midland'); + INSERT INTO classes(mentor_name , module ,course_date , course_location ) VALUES ('Andrew Jackson','Node', '2019-07-02','London'); + INSERT INTO classes(mentor_name , module ,course_date , course_location ) VALUES ('Stella Markov','HTML', '2019-02-07','Manchester'); + INSERT INTO classes(mentor_name , module ,course_date , course_location ) VALUES ('Sandeep Singh','CSS', '2019-03-09','Glascow'); + +// verify data Entries to classes + + select * from classes; + +// specific classes taken by students by updating the students table +UPDATE students SET classes_id = 1 WHERE id = 1; +UPDATE students SET classes_id = 5 WHERE id = 2; +UPDATE students SET classes_id = 4 WHERE id = 3; +UPDATE students SET classes_id = 1 WHERE id = 4; +UPDATE students SET classes_id = 3 WHERE id = 5; +UPDATE students SET classes_id = 2 WHERE id = 6; +UPDATE students SET classes_id = 4 WHERE id = 7; +UPDATE students SET classes_id = 3 WHERE id = 8; +UPDATE students SET classes_id = 5 WHERE id = 9; +UPDATE students SET classes_id = 2 WHERE id = 10; + +//Retrieve all the mentors who lived more than 5 years in Glasgow + +SELECT * FROM mentors WHERE years_in_glascow > 5; + +//Retrieve all the mentors whose favourite language is Javascript + +SELECT * FROM mentors WHERE fav_prog_language = 'Javascript'; + +//Retrieve all the students who are CYF graduates + +SELECT * FROM classes WHERE course_date < '2020-06-01'; + +//Retrieve all the students (retrieving student ids only is fine) who attended the Javascript class + +SELECT * FROM students WHERE classes_id = 2; +SELECT id FROM students WHERE classes_id = 2; + + ``` diff --git a/week-2/mandatory/2-ecommerce-db/cyf_ecommerce.sql b/week-2/mandatory/2-ecommerce-db/cyf_ecommerce.sql index 77253e2e..b99b6e05 100644 --- a/week-2/mandatory/2-ecommerce-db/cyf_ecommerce.sql +++ b/week-2/mandatory/2-ecommerce-db/cyf_ecommerce.sql @@ -103,3 +103,16 @@ INSERT INTO order_items (order_id, product_id, quantity) VALUES(8, 5, 1); INSERT INTO order_items (order_id, product_id, quantity) VALUES(9, 13, 2); INSERT INTO order_items (order_id, product_id, quantity) VALUES(10, 14, 1); INSERT INTO order_items (order_id, product_id, quantity) VALUES(10, 6, 5); + +SELECT customers.name, customers.address FROM customers WHERE country = 'United States'; +SELECT * FROM customers ORDER BY name ASC; +SELECT * FROM products WHERE unit_price > 100; +SELECT * FROM products WHERE product_name LIKE '%socks%'; +SELECT * FROM products ORDER BY unit_price DESC LIMIT 5; +SELECT product_name,unit_price,supplier_name FROM products INNER JOIN suppliers ON suppliers.id = products.id WHERE country = 'United Kingdom'; +SELECT product_name,supplier_name FROM suppliers INNER JOIN products ON suppliers.id = products.id WHERE country = 'United Kingdom'; +SELECT * FROM orders INNER JOIN customers on customers.id = orders.id; +SELECT * FROM orders INNER JOIN customers on customers.id = orders.id WHERE customers.name = 'Hope Crosby'; +SELECT product_name,unit_price,quantity FROM products INNER JOIN order_items ON order_items.id = products.id INNER JOIN orders ON orders.id = product_id WHERE order_reference = 'ORD006'; +SELECT customers.name, orders.order_reference, orders.order_date, products.product_name, suppliers.supplier_name ,order_items.quantity FROM customers INNER JOIN orders ON orders.customer_id=customers.id INNER JOIN order_items ON orders.id= order_items.order_id INNER JOIN products ON order_items.product_id = products.id INNER JOIN suppliers ON suppliers.id= products.supplier_id; +SELECT DISTINCT customers.name FROM customers, products, suppliers, orders ,order_items WHERE customers.id = orders.customer_id AND orders.id = order_items.order_id AND order_items.product_id = products.id AND suppliers.id = products.supplier_id AND suppliers.country='China'; diff --git a/week-2/mandatory/2-ecommerce-db/task.md b/week-2/mandatory/2-ecommerce-db/task.md index 70e9ce0c..4276349a 100644 --- a/week-2/mandatory/2-ecommerce-db/task.md +++ b/week-2/mandatory/2-ecommerce-db/task.md @@ -9,8 +9,11 @@ Below you will find a set of tasks for you to complete to set up a databases of To submit this homework write the correct commands for each question here: ```sql +//Database for students +createdb -p 5432 -U postgres students - +//Database for mentors +createdb -p 5432 -U postgres students ``` When you have finished all of the questions - open a pull request with your answers to the `Databases-Homework` repository. @@ -20,7 +23,8 @@ When you have finished all of the questions - open a pull request with your answ To prepare your environment for this homework, open a terminal and create a new database called `cyf_ecommerce`: ```sql -createdb cyf_ecommerce +//createdb cyf_ecommerce +createdb -p 5432 -U postgres cyf_ecommerce ``` Import the file [`cyf_ecommerce.sql`](./cyf_ecommerce.sql) in your newly created database: @@ -36,14 +40,47 @@ Open the file `cyf_ecommerce.sql` in VSCode and make sure you understand all the Once you understand the database that you are going to work with, solve the following challenge by writing SQL queries using everything you learned about SQL: 1. Retrieve all the customers names and addresses who lives in United States + +`SELECT customers.name, customers.address FROM customers WHERE country = 'United States';` + 2. Retrieve all the customers ordered by ascending name + +`SELECT * FROM customers ORDER BY name ASC;` + 3. Retrieve all the products which cost more than 100 + +`SELECT * FROM products WHERE unit_price > 100;` + 4. Retrieve all the products whose name contains the word `socks` + +`SELECT * FROM products WHERE product_name LIKE '%socks%';` + 5. Retrieve the 5 most expensive products + +`SELECT * FROM products ORDER BY unit_price DESC LIMIT 5;` + 6. Retrieve all the products with their corresponding suppliers. The result should only contain the columns `product_name`, `unit_price` and `supplier_name` + +`SELECT product_name,unit_price,supplier_name FROM products INNER JOIN suppliers ON suppliers.id = products.id WHERE country = 'United Kingdom';` + 7. Retrieve all the products sold by suppliers based in the United Kingdom. The result should only contain the columns `product_name` and `supplier_name`. + +`SELECT product_name,supplier_name FROM suppliers INNER JOIN products ON suppliers.id = products.id WHERE country = 'United Kingdom';` + 8. Retrieve all orders from customer ID `1` + +`SELECT * FROM orders INNER JOIN customers on customers.id = orders.id;` + 9. Retrieve all orders from customer named `Hope Crosby` + +`SELECT * FROM orders INNER JOIN customers on customers.id = orders.id WHERE customers.name = 'Hope Crosby';` + 10. Retrieve all the products in the order `ORD006`. The result should only contain the columns `product_name`, `unit_price` and `quantity`. + +`SELECT product_name,unit_price,quantity FROM products INNER JOIN order_items ON order_items.id = products.id INNER JOIN orders ON orders.id = product_id WHERE order_reference = 'ORD006';` + 11. Retrieve all the products with their supplier for all orders of all customers. The result should only contain the columns `name` (from customer), `order_reference` `order_date`, `product_name`, `supplier_name` and `quantity`. + +SELECT customers.name, orders.order_reference, orders.order_date, products.product_name, suppliers.supplier_name ,order_items.quantity FROM customers INNER JOIN orders ON orders.customer_id=customers.id INNER JOIN order_items ON orders.id= order_items.order_id INNER JOIN products ON order_items.product_id = products.id INNER JOIN suppliers ON suppliers.id= products.supplier_id; + 12. Retrieve the names of all customers who bought a product from a supplier from China. diff --git a/week-2/mandatory/3-api/server.js b/week-2/mandatory/3-api/server.js new file mode 100644 index 00000000..fc5194bf --- /dev/null +++ b/week-2/mandatory/3-api/server.js @@ -0,0 +1,40 @@ +const express = require("express") +const app = express() +const {Pool} = require("pg") + +app.use(express.json()); + +const pool = new Pool({ + user: "S225693", + host: "localhost", + database: "cyf_ecommerce", + password: "lucianome1", + port: 5432, +}); + +app.get("/customers", function (req, res) { + + pool.query("SELECT * FROM customers") + .then((result) => res.json(result.rows)) + .catch((e) => console.error(e)); +}); + + +app.get("/suppliers", function (req, res) { + pool + .query("SELECT * FROM suppliers") + .then((result) => res.json(result.rows)) + .catch((e) => console.error(e)); +}); +app.get("/products", function (req, res) { + pool + .query( + "SELECT products.product_name, suppliers.supplier_name FROM products INNER JOIN suppliers ON products.supplier_id = suppliers.id " + ) + .then((result) => res.json(result.rows)) + .catch((e) => console.error(e)); +}); + +app.listen(3001, function () { + console.log("Server is listening on port 3000. Ready to accept requests!"); +}); \ No newline at end of file diff --git a/week-3/mandatory/2-api/.gitignore b/week-3/mandatory/2-api/.gitignore new file mode 100644 index 00000000..1dcef2d9 --- /dev/null +++ b/week-3/mandatory/2-api/.gitignore @@ -0,0 +1,2 @@ +node_modules +.env \ No newline at end of file diff --git a/week-3/mandatory/2-api/cyf_ecommerce.sql b/week-3/mandatory/2-api/cyf_ecommerce.sql new file mode 100644 index 00000000..b7579c59 --- /dev/null +++ b/week-3/mandatory/2-api/cyf_ecommerce.sql @@ -0,0 +1,118 @@ +drop table if exists order_items; +drop table if exists orders; +drop table if exists customers; +drop table if exists products; +drop table if exists suppliers; + +CREATE TABLE customers ( + id SERIAL PRIMARY KEY, + name VARCHAR(50) NOT NULL, + address VARCHAR(120), + city VARCHAR(30), + country VARCHAR(20) +); + +CREATE TABLE suppliers ( + id SERIAL PRIMARY KEY, + supplier_name VARCHAR(100) NOT NULL, + country VARCHAR(20) NOT NULL +); + +CREATE TABLE products ( + id SERIAL PRIMARY KEY, + product_name VARCHAR(100) NOT NULL, + unit_price INT NOT NULL, + supplier_id INT REFERENCES suppliers(id) +); + +CREATE TABLE orders ( + id SERIAL PRIMARY KEY, + order_date DATE NOT NULL, + order_reference VARCHAR(10) NOT NULL, + customer_id INT REFERENCES customers(id) +); + +CREATE TABLE order_items ( + id SERIAL PRIMARY KEY, + order_id INT REFERENCES orders(id), + product_id INT REFERENCES products(id), + quantity INT NOT NULL +); + +INSERT INTO customers (name, address, city, country) VALUES ('Guy Crawford','770-2839 Ligula Road','Paris','France'); +INSERT INTO customers (name, address, city, country) VALUES ('Hope Crosby','P.O. Box 276, 4976 Sit Rd.','Steyr','United Kingdom'); +INSERT INTO customers (name, address, city, country) VALUES ('Britanney Kirkland','P.O. Box 577, 5601 Sem, St.','Little Rock','United Kingdom'); +INSERT INTO customers (name, address, city, country) VALUES ('Amber Tran','6967 Ac Road','Villafranca Asti','United States'); +INSERT INTO customers (name, address, city, country) VALUES ('Edan Higgins','Ap #840-3255 Tincidunt St.','Arles','United States'); +INSERT INTO customers (name, address, city, country) VALUES ('Quintessa Austin','597-2737 Nunc Rd.','Saint-Marc','United Kingdom'); + +INSERT INTO suppliers (supplier_name, country) VALUES ('Amazon', 'United States'); +INSERT INTO suppliers (supplier_name, country) VALUES ('Taobao', 'China'); +INSERT INTO suppliers (supplier_name, country) VALUES ('Argos', 'United Kingdom'); +INSERT INTO suppliers (supplier_name, country) VALUES ('Sainsburys', 'United Kingdom'); + +INSERT INTO products (product_name, unit_price, supplier_id) VALUES ('Tee Shirt Olympic Games', 20, 1); +INSERT INTO products (product_name, unit_price, supplier_id) VALUES ('Tee Shirt Olympic Games', 18, 2); +INSERT INTO products (product_name, unit_price, supplier_id) VALUES ('Tee Shirt Olympic Games', 21, 3); +INSERT INTO products (product_name, unit_price, supplier_id) VALUES ('Mobile Phone X', 299, 1); +INSERT INTO products (product_name, unit_price, supplier_id) VALUES ('Mobile Phone X', 249, 4); +INSERT INTO products (product_name, unit_price, supplier_id) VALUES ('Super warm socks', 10, 1); +INSERT INTO products (product_name, unit_price, supplier_id) VALUES ('Super warm socks', 5, 2); +INSERT INTO products (product_name, unit_price, supplier_id) VALUES ('Super warm socks', 8, 3); +INSERT INTO products (product_name, unit_price, supplier_id) VALUES ('Super warm socks', 10, 4); +INSERT INTO products (product_name, unit_price, supplier_id) VALUES ('Le Petit Prince', 10, 1); +INSERT INTO products (product_name, unit_price, supplier_id) VALUES ('Le Petit Prince', 10, 4); +INSERT INTO products (product_name, unit_price, supplier_id) VALUES ('Ball', 14, 1); +INSERT INTO products (product_name, unit_price, supplier_id) VALUES ('Ball', 15, 4); +INSERT INTO products (product_name, unit_price, supplier_id) VALUES ('Ball', 20, 2); +INSERT INTO products (product_name, unit_price, supplier_id) VALUES ('Javascript Book', 40, 1); +INSERT INTO products (product_name, unit_price, supplier_id) VALUES ('Javascript Book', 39, 3); +INSERT INTO products (product_name, unit_price, supplier_id) VALUES ('Javascript Book', 41, 2); +INSERT INTO products (product_name, unit_price, supplier_id) VALUES ('Coffee Cup', 3, 1); +INSERT INTO products (product_name, unit_price, supplier_id) VALUES ('Coffee Cup', 4, 2); +INSERT INTO products (product_name, unit_price, supplier_id) VALUES ('Coffee Cup', 4, 3); +INSERT INTO products (product_name, unit_price, supplier_id) VALUES ('Coffee Cup', 5, 4); + +INSERT INTO orders (order_date, order_reference, customer_id) VALUES ('2019-06-01', 'ORD001', 1); +INSERT INTO orders (order_date, order_reference, customer_id) VALUES ('2019-07-15', 'ORD002', 1); +INSERT INTO orders (order_date, order_reference, customer_id) VALUES ('2019-07-11', 'ORD003', 1); +INSERT INTO orders (order_date, order_reference, customer_id) VALUES ('2019-05-24', 'ORD004', 2); +INSERT INTO orders (order_date, order_reference, customer_id) VALUES ('2019-05-30', 'ORD005', 3); +INSERT INTO orders (order_date, order_reference, customer_id) VALUES ('2019-07-05', 'ORD006', 4); +INSERT INTO orders (order_date, order_reference, customer_id) VALUES ('2019-04-05', 'ORD007', 4); +INSERT INTO orders (order_date, order_reference, customer_id) VALUES ('2019-07-23', 'ORD008', 5); +INSERT INTO orders (order_date, order_reference, customer_id) VALUES ('2019-07-24', 'ORD009', 5); +INSERT INTO orders (order_date, order_reference, customer_id) VALUES ('2019-05-10', 'ORD010', 5); + +INSERT INTO order_items (order_id, product_id, quantity) VALUES(1, 2, 1); +INSERT INTO order_items (order_id, product_id, quantity) VALUES(1, 7, 5); +INSERT INTO order_items (order_id, product_id, quantity) VALUES(2, 8, 4); +INSERT INTO order_items (order_id, product_id, quantity) VALUES(2, 11, 1); +INSERT INTO order_items (order_id, product_id, quantity) VALUES(3, 20, 10); +INSERT INTO order_items (order_id, product_id, quantity) VALUES(3, 14, 2); +INSERT INTO order_items (order_id, product_id, quantity) VALUES(4, 4, 1); +INSERT INTO order_items (order_id, product_id, quantity) VALUES(5, 16, 2); +INSERT INTO order_items (order_id, product_id, quantity) VALUES(5, 10, 1); +INSERT INTO order_items (order_id, product_id, quantity) VALUES(6, 19, 3); +INSERT INTO order_items (order_id, product_id, quantity) VALUES(6, 17, 1); +INSERT INTO order_items (order_id, product_id, quantity) VALUES(6, 11, 1); +INSERT INTO order_items (order_id, product_id, quantity) VALUES(6, 9, 3); +INSERT INTO order_items (order_id, product_id, quantity) VALUES(7, 8, 15); +INSERT INTO order_items (order_id, product_id, quantity) VALUES(8, 1, 1); +INSERT INTO order_items (order_id, product_id, quantity) VALUES(8, 5, 1); +INSERT INTO order_items (order_id, product_id, quantity) VALUES(9, 13, 2); +INSERT INTO order_items (order_id, product_id, quantity) VALUES(10, 14, 1); +INSERT INTO order_items (order_id, product_id, quantity) VALUES(10, 6, 5); + +-- SELECT customers.name, customers.address FROM customers WHERE country = 'United States'; +-- SELECT * FROM customers ORDER BY name ASC; +-- SELECT * FROM products WHERE unit_price > 100; +-- SELECT * FROM products WHERE product_name LIKE '%socks%'; +-- SELECT * FROM products ORDER BY unit_price DESC LIMIT 5; +-- SELECT product_name,unit_price,supplier_name FROM products INNER JOIN suppliers ON suppliers.id = products.id WHERE country = 'United Kingdom'; +-- SELECT product_name,supplier_name FROM suppliers INNER JOIN products ON suppliers.id = products.id WHERE country = 'United Kingdom'; +-- SELECT * FROM orders INNER JOIN customers on customers.id = orders.id; +-- SELECT * FROM orders INNER JOIN customers on customers.id = orders.id WHERE customers.name = 'Hope Crosby'; +-- SELECT product_name,unit_price,quantity FROM products INNER JOIN order_items ON order_items.id = products.id INNER JOIN orders ON orders.id = product_id WHERE order_reference = 'ORD006'; +-- SELECT customers.name, orders.order_reference, orders.order_date, products.product_name, suppliers.supplier_name ,order_items.quantity FROM customers INNER JOIN orders ON orders.customer_id=customers.id INNER JOIN order_items ON orders.id= order_items.order_id INNER JOIN products ON order_items.product_id = products.id INNER JOIN suppliers ON suppliers.id= products.supplier_id; +-- SELECT DISTINCT customers.name FROM customers, products, suppliers, orders ,order_items WHERE customers.id = orders.customer_id AND orders.id = order_items.order_id AND order_items.product_id = products.id AND suppliers.id = products.supplier_id AND suppliers.country='China'; diff --git a/week-3/mandatory/2-api/package-lock.json b/week-3/mandatory/2-api/package-lock.json new file 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b/week-3/mandatory/2-api/server.js @@ -0,0 +1,303 @@ +const express = require("express"); +const { Pool } = require("pg"); +require("dotenv").config(); +const app = express(); +const PORT = process.env.PORT || 3000; + +app.use(express.json()); + +const pool = new Pool({ + user: "S225693", + host: "localhost", + database: "cyf_ecommerce", + password: "lucianome1", + port: 5432, +}); + +app.get("/customers", function (req, res) { + pool + .query("SELECT * FROM customers") + .then((result) => res.json(result.rows)) + .catch((e) => console.error(e)); +}); + +app.get("/suppliers", function (req, res) { + pool + .query("SELECT * FROM suppliers") + .then((result) => res.json(result.rows)) + .catch((e) => console.error(e)); +}); +app.get("/products", function (req, res) { + pool + .query( + "SELECT products.product_name, suppliers.supplier_name FROM products INNER JOIN suppliers ON products.supplier_id = suppliers.id " + ) + .then((result) => res.json(result.rows)) + .catch((e) => console.error(e)); +}); + +app.get("/products?name=Ball", function (req, res) { + const productByName = req.query.name; + let query = `SELECT * FROM products ORDER BY name`; + + if (productByName) { + query = `SELECT * FROM products WHERE name LIKE '%${productByName}%' ORDER BY name`; + } + + pool + .query(query) + .then((result) => res.json(result.rows)) + .catch((e) => console.error(e)); +}); + +app.get("/customers/:customerId", function (req, res) { + const customerId = req.params.customerId; + + pool + .query("SELECT * FROM customers WHERE id=$1", [customerId]) + .then((result) => res.json(result.rows)) + .catch((e) => console.error(e)); +}); + + +app.post("/customers", function (req, res) { + const newCustomerName = req.body.name; + const newCustomerAddress = req.body.address; + const newCustomerCity = req.body.city; + const newCustomerCountry = req.body.country; + +pool + .query("SELECT * FROM customers WHERE name=$1", [newCustomerName]) + .then((result) => { + if (result.rows.length > 0) { + return res + .status(400) + .send("A customer with the same name already exists!"); + } else { + const query = + "INSERT INTO customers (name, address, city, country) VALUES ($1, $2, $3, $4)"; + pool + .query(query, [ + newCustomerName, + newCustomerAddress, + newCustomerCity, + newCustomerCountry, + ]) + .then(() => res.send("customer created!")) + .catch((e) => console.error(e)); + } + }); +}); + +app.post("/products", function (req, res) { + const newProductsName = req.body.product_name; + const newProductPrice = req.body.unit_price; + const newSupplierId = req.body.supplier_id; + + if (!Number.isInteger(newProductPrice) && newSupplierId) { + return res + .status(400) + .send("The the product price and supplier-ID should be a positive integer."); + } + + pool + .query("SELECT * FROM products WHERE product_name=$1", [newProductsName]) + .then((result) => { + if (result.rows.length > 0) { + + return res + .status(400) + .send("A product with the same name already exists!"); + + } + else + { + const query = + "INSERT INTO products (product_name, unit_price, supplier_id) VALUES ($1, $2, $3)"; + + pool + .query(query, [newProductsName, newProductPrice, newSupplierId]) + .then(() => res.send("product created!")) + .catch((e) => console.error(e)); + } + }); +}); + + +app.post('/customers/:customerId/orders', (req, res) => { + const { date, reference } = req.body; + const { customerId } = req.params; + + if (!date || !reference) { + return res.json({ error: 'Order date and reference number are required.' }); + } + + pool + .query(`SELECT * FROM customers WHERE customers.id=${customerId}`) + .then((result) => { + if (result.rowCount < 1) { + return res.json(`Customer with id ${customerId} don't exist`); + } else { + pool + .query( + `INSERT INTO orders (order_date, order_reference, customer_id) VALUES ($1, $2, $3)`, + [date, reference, customerId] + ) + .then((result) => { + return res.json({ success: true }); + }) + .catch((err) => console.error(err)); + } + }) + .catch((err) => console.error(err)); +}); + +app.put('/customers/:customerId', async (req, res) => { + const { + name: newCustomerName, + address: newCustomerAddress, + city: newCustomerCity, + country: newCustomerCountry, + } = req.body; + const { customerId } = req.params; + + try { + const customer = await pool.query( + `SELECT * from customers WHERE customers.id=${customerId}` + ); + if (customer.rowCount < 1) { + return res.json({ + error: `Customer with an id ${customerId} doesn't exist.`, + }); + } + const { name, address, city, country } = customer.rows[0]; + const updatedCustomer = await pool.query( + ` + UPDATE customers c + SET name=$1, address=$2, city=$3, country=$4 + WHERE c.id=${customerId}`, + [ + newCustomerName || name, + newCustomerAddress || address, + newCustomerCity || city, + newCustomerCountry || country, + ] + ); + return res.json({ success: true }); + } catch (e) { + console.error(e); + } +}); + +app.delete('/orders/:orderId', async (req, res) => { + const { orderId } = req.params; + try { + const orderItems = await pool.query( + `DELETE FROM order_items WHERE order_items.order_id=${orderId}` + ); + + const orders = await pool.query( + `DELETE FROM orders WHERE orders.id=${orderId}` + ); + + if (orders.rowCount < 1) { + return res.json({ + success: false, + message: `No orders with id ${orderId} found.`, + }); + } else { + return res.json({ success: true }); + } + } catch (e) { + console.error(e); + } +}); + +app.delete('/customers/:customerId', async (req, res) => { + const { customerId } = req.params; + + try { + const customerOrders = await pool.query( + `SELECT * FROM orders WHERE orders.customer_id=${customerId}` + ); + + if (customerOrders.rowCount > 0) { + return res.json({ + success: false, + message: "Can't delete a customer with existing orders", + }); + } + + const customer = await pool.query( + `DELETE FROM customers WHERE customers.id=${customerId}` + ); + + if (customer.rowCount < 1) { + return res.json({ + success: false, + message: `Customer with id ${customerId} doesn't exist`, + }); + } + + return res.json({ success: true }); + } catch (e) { + console.error(e); + } +}); + +app.get('/customers/:customerId/orders', async (req, res) => { + const { customerId } = req.params; + + try { + const orders = await pool.query(` + SELECT customers.name, orders.order_reference, orders.order_date, order_items.quantity, products.product_name, products.unit_price, suppliers.supplier_name FROM customers c + INNER JOIN orders o ON c.id=o.customer_id + INNER JOIN order_items oi ON o.id=oi.order_id + INNER JOIN products p ON oi.product_id=p.id + INNER JOIN suppliers s ON s.id=p.supplier_id + WHERE c.id=${customerId} + `); + + if (orders.rowCount < 1) { + return res.json({ message: 'No orders found for this customer' }); + } + + // to display data more nicely + const getProductInfo = (obj) => { + return { + product_name: obj.product_name, + quantity: obj.quantity, + unit_price: obj.unit_price, + supplier_name: obj.supplier_name, + }; + }; + + const result = orders.rows.reduce((acc, cur) => { + const indx = acc.findIndex( + (e) => e.order_reference === cur.order_reference + ); + + if (indx === -1) { + // new order + const order = {}; + order.customer = cur.name; + order.order_reference = cur.order_reference; + order.order_date = cur.order_date; + order.products = [getProductInfo(cur)]; + acc.push(order); + } else { + // order already exists, add product info to products array + acc[idx].products.push(getProductInfo(cur)); + } + return acc; + }, []); + + return res.json({ data: result }); + } catch (e) { + console.error(e); + } +}); + +app.listen(PORT, () => console.log(`App listening on port ${PORT || 3000}`)); + +