diff --git a/Week3/homework/SQL-Normalization/sqlNormalization.md b/Week3/homework/SQL-Normalization/sqlNormalization.md new file mode 100644 index 000000000..1410f4214 --- /dev/null +++ b/Week3/homework/SQL-Normalization/sqlNormalization.md @@ -0,0 +1,36 @@ +### 1. Columns that violate 1NF + +- **dinner_date**: values use different formats, so the column does not have one consistent domain. +- **food_code**: contains multiple values in a single cell (not atomic). +- **food_description**: contains multiple values in a single cell (not atomic). + +### 2. Entities that can be extracted + +- Member +- Dinner +- Venue +- Food + +### 3. 3NF-compliant tables and columns (no junction tables) + +#### Member + +- member_id (PK) +- member_name +- member_address + +#### Dinner + +- dinner_id (PK) +- dinner_date +- venue_code (FK → Venue.venue_code) + +#### Venue + +- venue_code (PK) +- venue_description + +#### Food + +- food_code (PK) +- food_description diff --git a/Week3/homework/SQL-Transactions/client.js b/Week3/homework/SQL-Transactions/client.js new file mode 100644 index 000000000..d3b59fa5f --- /dev/null +++ b/Week3/homework/SQL-Transactions/client.js @@ -0,0 +1,12 @@ +import { Client } from "pg"; + +const config = { + host: "localhost", + user: "hyfuser", + password: "hyfpass", + database: "postgres", + port: 5432, +}; + +const client = new Client(config); +export default client; diff --git a/Week3/homework/SQL-Transactions/docker-compose.yml b/Week3/homework/SQL-Transactions/docker-compose.yml new file mode 100644 index 000000000..f3761d76e --- /dev/null +++ b/Week3/homework/SQL-Transactions/docker-compose.yml @@ -0,0 +1,17 @@ +version: "3.9" + +services: + postgres: + image: postgres:16 + container_name: postgres-db + environment: + POSTGRES_USER: hyfuser + POSTGRES_PASSWORD: hyfpass + POSTGRES_DB: postgres + ports: + - "5432:5432" + volumes: + - postgres_data:/var/lib/postgresql/data + +volumes: + postgres_data: diff --git a/Week3/homework/SQL-Transactions/package-lock.json b/Week3/homework/SQL-Transactions/package-lock.json new file mode 100644 index 000000000..eb20efaa6 --- /dev/null +++ b/Week3/homework/SQL-Transactions/package-lock.json @@ -0,0 +1,162 @@ +{ + "name": "sql-transactions", + "version": "1.0.0", + "lockfileVersion": 3, + "requires": true, + "packages": { + "": { + "name": "sql-transactions", + "version": "1.0.0", + "license": "ISC", + "dependencies": { + "pg": "^8.16.3" + } + }, + "node_modules/pg": { + "version": "8.16.3", + "resolved": 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b/Week3/homework/SQL-Transactions/package.json new file mode 100644 index 000000000..9e3924fa3 --- /dev/null +++ b/Week3/homework/SQL-Transactions/package.json @@ -0,0 +1,16 @@ +{ + "name": "sql-transactions", + "version": "1.0.0", + "main": "client.js", + "type": "module", + "scripts": { + "test": "echo \"Error: no test specified\" && exit 1" + }, + "keywords": [], + "author": "", + "license": "ISC", + "description": "", + "dependencies": { + "pg": "^8.16.3" + } +} diff --git a/Week3/homework/SQL-Transactions/transaction.js b/Week3/homework/SQL-Transactions/transaction.js new file mode 100644 index 000000000..f6a068a40 --- /dev/null +++ b/Week3/homework/SQL-Transactions/transaction.js @@ -0,0 +1,40 @@ +import client from "./client.js"; + +async function runTransaction() { + try { + await client.connect(); + console.log("Connected to PostgreSQL database!"); + + await client.query("BEGIN"); + + //withdraw 1000 from account 101 + await client.query( + `UPDATE account SET balance = balance - 1000 WHERE account_number = 101` + ); + + //Deposit the money to 102 + await client.query(` + UPDATE account SET balance = balance + 1000 WHERE account_number = 102 + `); + + //log them to account changes + await client.query(` + INSERT INTO account_changes (account_number, amount, changed_date, remark) + VALUES + (101, -1000.00, NOW(), 'Transfer 1000 to 102'), + (102, 1000.00, NOW(), '1000 from 101') +`); + + await client.query("COMMIT"); + + // if successful + console.log("Transaction executed successfully"); + } catch (error) { + console.error("Error executing transaction", error); + await client.query("ROLLBACK"); + } finally { + await client.end(); + } +} + +runTransaction(); diff --git a/Week3/homework/SQL-Transactions/transactions-create-tables.js b/Week3/homework/SQL-Transactions/transactions-create-tables.js new file mode 100644 index 000000000..fddda70f9 --- /dev/null +++ b/Week3/homework/SQL-Transactions/transactions-create-tables.js @@ -0,0 +1,41 @@ +import client from "./client.js"; + +async function seedDatabase() { + try { + await client.connect(); + console.log("Connected to PostgreSQL database!"); + + await client.query("BEGIN"); + + await client.query("DROP TABLE IF EXISTS account_changes"); + + await client.query("DROP TABLE IF EXISTS account"); + + await client.query(`CREATE TABLE account ( + account_number INTEGER NOT NULL PRIMARY KEY, + balance NUMERIC(12,2) + )`); + + await client.query(`CREATE TABLE account_changes ( + change_number SERIAL PRIMARY KEY, + account_number INTEGER, + amount NUMERIC(12,2), + changed_date TIMESTAMP, + remark VARCHAR(250), + FOREIGN KEY (account_number) REFERENCES account(account_number) +)`); + + await client.query("COMMIT"); + + // if successful + console.log("Tables created successfully"); + } catch (error) { + console.error("Error seeding database:", error); + await client.query("ROLLBACK"); + console.log("Transaction failed"); + } finally { + await client.end(); + } +} + +seedDatabase(); diff --git a/Week3/homework/SQL-Transactions/transactions-insert-values.js b/Week3/homework/SQL-Transactions/transactions-insert-values.js new file mode 100644 index 000000000..e82c8b85a --- /dev/null +++ b/Week3/homework/SQL-Transactions/transactions-insert-values.js @@ -0,0 +1,37 @@ +import client from "./client.js"; + +async function insertValues() { + try { + await client.connect(); + console.log("Connected to PostgreSQL database!"); + + await client.query("BEGIN"); + + await client.query(`INSERT INTO account (account_number, balance) VALUES + (101, 2000.00), + (102, 500.00), + (103, 300.00), + (104, 50.00), + (105, 0.00)`); + + await client.query(`INSERT INTO account_changes(account_number, amount, changed_date, remark) VALUES + (101, 200.00, '2025-01-20T10:15:00Z', 'Deposit'), + (102, -50.00, '2025-01-21T14:30:00Z', 'ATM Withdrawal'), + (103, 1000.00, '2025-01-22T09:00:00Z', 'Salary Deposit'), + (101, -100.00, '2025-01-23T11:45:00Z', 'Online Purchase'), + (101, 200.00, '2025-01-24T10:15:00Z', 'ATM Withdrawal') + `); + + await client.query("COMMIT"); + + // if successful + console.log("Tables inserted successfully"); + } catch (error) { + console.error("Error inserting tables", error); + await client.query("ROLLBACK"); + } finally { + await client.end(); + } +} + +insertValues(); diff --git a/Week3/homework/SQL-injection/package-lock.json b/Week3/homework/SQL-injection/package-lock.json new file mode 100644 index 000000000..ec3a91d66 --- /dev/null +++ b/Week3/homework/SQL-injection/package-lock.json @@ -0,0 +1,162 @@ +{ + "name": "sql-injection", + "version": "1.0.0", + "lockfileVersion": 3, + "requires": true, + "packages": { + "": { + "name": "sql-injection", + "version": "1.0.0", + "license": "ISC", + "dependencies": { + "pg": "^8.16.3" + } + }, + "node_modules/pg": { + "version": "8.16.3", + "resolved": "https://registry.npmjs.org/pg/-/pg-8.16.3.tgz", + "integrity": 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b/Week3/homework/SQL-injection/package.json @@ -0,0 +1,15 @@ +{ + "name": "sql-injection", + "version": "1.0.0", + "main": "sqlInjection.js", + "scripts": { + "test": "echo \"Error: no test specified\" && exit 1" + }, + "keywords": [], + "author": "", + "license": "ISC", + "description": "", + "dependencies": { + "pg": "^8.16.3" + } +} diff --git a/Week3/homework/SQL-injection/sqlInjection.js b/Week3/homework/SQL-injection/sqlInjection.js new file mode 100644 index 000000000..42182abc3 --- /dev/null +++ b/Week3/homework/SQL-injection/sqlInjection.js @@ -0,0 +1,45 @@ +const { Client } = require("pg"); + +/** + * Why the previous code was unsafe: + * + * 1. SQL Injection via always-true condition: + * If a user enters something like: + * name = "' OR 1=1 --" + * the query becomes: + * SELECT Population FROM Country WHERE Name = '' OR 1=1 -- ' AND code='...' + * Because `1=1` is always true, the database returns all rows. + * + * 2. SQL Injection enabling destructive commands: + * If input is not sanitized, an attacker could inject additional SQL, for example: + * name = "'; DROP TABLE Country; --" + * This can transform the query into one that executes harmful statements, + * potentially deleting or modifying data. + * + * Using parameterized queries ($1, $2, etc.) prevents these attacks by + * ensuring user input is treated as data, never executable SQL. + */ + +const conn = new Client({ + host: "localhost", + user: "hyfuser", + password: "hyfpass", + database: "world", + port: 5432, +}); + +conn.connect(); + +function getPopulation(Country, name, code, cb) { + const query = ` + SELECT population + FROM ${Country} + WHERE name = $1 AND code = $2 + `; + + conn.query(query, [name, code], function (err, result) { + if (err) cb(err); + else if (result.rows.length === 0) cb(new Error("Not found")); + else cb(null, result.rows[0].population); + }); +} diff --git a/Week3/homework/mongodb/index.js b/Week3/homework/mongodb/index.js index 41ee8b618..c2528ba22 100644 --- a/Week3/homework/mongodb/index.js +++ b/Week3/homework/mongodb/index.js @@ -2,6 +2,10 @@ const { MongoClient, ServerApiVersion } = require("mongodb"); const { seedDatabase } = require("./seedDatabase.js"); +// const MONGODB_URL = process.env.MONGODB_URL; +require("dotenv").config(); +// const client = new MongoClient(process.env.MONGODB_URL); + async function createEpisodeExercise(client) { /** * We forgot to add the last episode of season 9. It has this information: @@ -13,8 +17,31 @@ async function createEpisodeExercise(client) { // Write code that will add this to the collection! + // await createEpisodeExercise(MongoClient, ) + const newEpisode = { + episode: "S09E13", + title: "MOUNTAIN HIDE-AWAY", + elements: [ + "CIRRUS", + "CLOUDS", + "CONIFER", + "DECIDIOUS", + "GRASS", + "MOUNTAIN", + "MOUNTAINS", + "RIVER", + "SNOWY_MOUNTAIN", + "TREE", + "TREES", + ], + }; + const result = await client + .db("databaseWeek3") + .collection("bob_ross_episodes") + .insertOne(newEpisode); + console.log( - `Created season 9 episode 13 and the document got the id ${"TODO: fill in variable here"}` + `Created season 9 episode 13 and the document got the id ${result.insertedId}` ); } @@ -25,27 +52,55 @@ async function findEpisodesExercises(client) { */ // Find the title of episode 2 in season 2 [Should be: WINTER SUN] + const mongoCollection = client + .db("databaseWeek3") + .collection("bob_ross_episodes"); - console.log( - `The title of episode 2 in season 2 is ${"TODO: fill in variable here"}` - ); + const seazon2Episode2 = await mongoCollection.findOne({ episode: "S02E02" }); + + console.log(`The title of episode 2 in season 2 is ${seazon2Episode2.title}`); // Find the season and episode number of the episode called "BLACK RIVER" [Should be: S02E06] + const findBlackFiver = await mongoCollection.findOne({ + title: "BLACK RIVER", + }); + console.log( - `The season and episode number of the "BLACK RIVER" episode is ${"TODO: fill in variable here"}` + `The season and episode number of the "BLACK RIVER" episode is ${findBlackFiver.episode}` ); // Find all of the episode titles where Bob Ross painted a CLIFF [Should be: NIGHT LIGHT, EVENING SEASCAPE, SURF'S UP, CLIFFSIDE, BY THE SEA, DEEP WILDERNESS HOME, CRIMSON TIDE, GRACEFUL WATERFALL] + const allResults = await mongoCollection + .find({ + elements: "CLIFF", + }) + .toArray(); + + const titles = allResults.map((episode) => episode.title); + console.log( - `The episodes that Bob Ross painted a CLIFF are ${"TODO: fill in variable here"}` + `The episodes that Bob Ross painted a CLIFF are ${titles.join(", ")}` ); // Find all of the episode titles where Bob Ross painted a CLIFF and a LIGHTHOUSE [Should be: NIGHT LIGHT] + const cliffAndLighthouse = await mongoCollection + .find({ + elements: { + $all: ["CLIFF", "LIGHTHOUSE"], + }, + }) + .toArray(); + + const cliffAndLighthouseTitles = cliffAndLighthouse.map( + (episode) => episode.title + ); console.log( - `The episodes that Bob Ross painted a CLIFF and a LIGHTHOUSE are ${"TODO: fill in variable here"}` + `The episodes that Bob Ross painted a CLIFF and a LIGHTHOUSE are ${cliffAndLighthouseTitles.join( + ", " + )}` ); } @@ -57,18 +112,32 @@ async function updateEpisodeExercises(client) { * Note: do NOT change the data.json file */ - // Episode 13 in season 30 should be called BLUE RIDGE FALLS, yet it is called BLUE RIDGE FALLERS now. Fix that + // Episode 13 in season 30 should be called BLUE RIDGE FALLS, yet it is called "BLUE RIDGE FALLERS" now. Fix that + + const result = await client + .db("databaseWeek3") + .collection("bob_ross_episodes") + .updateOne({ episode: "S30E13" }, { $set: { title: "BLUE RIDGE FALLS" } }); console.log( - `Ran a command to update episode 13 in season 30 and it updated ${"TODO: fill in variable here"} episodes` + `Ran a command to update episode 13 in season 30 and it updated ${result.modifiedCount} episodes` ); // Unfortunately we made a mistake in the arrays and the element type called 'BUSHES' should actually be 'BUSH' as sometimes only one bush was painted. // Update all of the documents in the collection that have `BUSHES` in the elements array to now have `BUSH` // It should update 120 episodes! + const results = await client + .db("databaseWeek3") + .collection("bob_ross_episodes") + .updateMany( + { elements: "BUSHES" }, + { $set: { "elements.$[e]": "BUSH" } }, + { arrayFilters: [{ e: "BUSHES" }] } + ); + console.log( - `Ran a command to update all the BUSHES to BUSH and it updated ${"TODO: fill in variable here"} episodes` + `Ran a command to update all the BUSHES to BUSH and it updated ${results.modifiedCount} episodes` ); } @@ -78,8 +147,21 @@ async function deleteEpisodeExercise(client) { * This is episode 14 in season 31. Please remove it and verify that it has been removed! */ + const result = await client + .db("databaseWeek3") + .collection("bob_ross_episodes") + .deleteOne({ + episode: "S31E14", + }); + + if (result.deletedCount == 0) { + console.log(`No movie found with episode 'S31E14'`); + + return; + } + console.log( - `Ran a command to delete episode and it deleted ${"TODO: fill in variable here"} episodes` + `Ran a command to delete episode and it deleted ${result.deletedCount} episodes` ); } @@ -89,9 +171,13 @@ async function main() { `You did not set up the environment variables correctly. Did you create a '.env' file and add a package to create it?` ); } + // const client = new MongoClient(process.env.MONGODB_URL, { + // useNewUrlParser: true, + // useUnifiedTopology: true, + // serverApi: ServerApiVersion.v1, + // }); + const client = new MongoClient(process.env.MONGODB_URL, { - useNewUrlParser: true, - useUnifiedTopology: true, serverApi: ServerApiVersion.v1, }); diff --git a/Week3/homework/mongodb/package-lock.json b/Week3/homework/mongodb/package-lock.json new file mode 100644 index 000000000..13b0176f1 --- /dev/null +++ b/Week3/homework/mongodb/package-lock.json @@ -0,0 +1,563 @@ +{ + "name": "mongodb", + "version": "1.0.0", + "lockfileVersion": 3, + "requires": true, + "packages": { + "": { + "name": "mongodb", + "version": "1.0.0", + "license": "ISC", + "dependencies": { + "bson": "^7.0.0", + "dotenv": "^17.2.3", + "memory-pager": "^1.5.0", + "mongodb": "^7.0.0", + "mongodb-connection-string-url": "^7.0.0", + "punycode": "^2.3.1", + "sparse-bitfield": "^3.0.3", + 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