From ab69212ee511b342705669804fac6f4783a8b2a5 Mon Sep 17 00:00:00 2001 From: Shadi Date: Tue, 31 Mar 2026 14:44:43 +0200 Subject: [PATCH 1/2] Add SQL queries for book management and author details --- task-1/queries.sql | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) diff --git a/task-1/queries.sql b/task-1/queries.sql index fecf7ad..9148fda 100644 --- a/task-1/queries.sql +++ b/task-1/queries.sql @@ -1,20 +1,46 @@ ---- Queries -- **Question 1** — List the title and published year of every book in the `'Science Fiction'` genre, ordered by published year (oldest first). +SELECT title , published_year FROM books +WHERE genre = 'Science Fiction' ORDER BY published_year ASC; -- **Question 2** — Show every book published before 1950. Display the title and year only. +SELECT title , published_year FROM books +WHERE published_year < 1950; + -- **Question 3** — Show every book in the database along with its author's full name. Combine `first_name` and `last_name` into a single column called `author`. _(Hint: you will need a JOIN.)_ +SELECT a.first_name || ' ' || a.last_name AS author, b.title, b.genre, b.published_year FROM authors a +JOIN books b ON a.id = b.author_id + -- **Question 4** — List all books written by Stephen King. Show the title and published year, ordered by year. _(Hint: JOIN the two tables and filter on the author's name.)_ +SELECT a.first_name || ' ' || a.last_name AS author, b.title, b.published_year FROM authors a +JOIN books b ON a.id = b.author_id +WHERE author = 'Stephen King' ORDER BY published_year DESC; + -- **Question 5** — Add yourself as a new author. Use your real name, or make one up. Pick any nationality and birth year. +INSERT INTO authors (first_name, last_name, nationality, birth_year) VALUES +('Shadi', 'Abedinpour', 'Iranian', 1995); + -- **Question 6** — Add one book for the author you just inserted. It can be a real book or a made-up one. +INSERT INTO books (title, published_year,genre, author_id) VALUES +('The Story of My Cats', 2023, 'Biography', +(SELECT id FROM authors WHERE first_name = 'Shadi' AND last_name = 'Abedinpour')); + -- **Question 7** — The genre for "The Dark Tower: The Gunslinger" was entered incorrectly as `'Fantasy'`. It should be `'Horror'`. Write an UPDATE to fix it, then verify the change with a SELECT. +UPDATE books +SET genre = 'Horror' + WHERE title = 'The Dark Tower: The Gunslinger'; + SELECT * FROM books WHERE title = 'The Dark Tower: The Gunslinger'; + -- **Question 8** — Delete the book you added in Question 6. Make sure your query targets only that specific row. + DELETE FROM books + WHERE id = 101 --- @@ -23,5 +49,11 @@ -- These cover topics slightly beyond the core material. Have a go if you finish early. -- **Bonus A** — How many books are there per genre? Show the genre name and the count, ordered from most to fewest books. +SELECT genre, COUNT(*) AS book_count FROM books +GROUP BY genre +ORDER BY book_count DESC; -- **Bonus B** — Find any authors in the database who have no books at all. _(Hint: you will need a LEFT JOIN and check for NULL.) +SELECT a.first_name || ' ' || a.last_name AS author FROM authors a +LEFT JOIN books b ON a.id = b.author_id +WHERE b.id IS NULL; \ No newline at end of file From 3aac9c250171838a2c5f517cbdadfcb89caca3dc Mon Sep 17 00:00:00 2001 From: Shadi Date: Tue, 31 Mar 2026 18:09:51 +0200 Subject: [PATCH 2/2] feat(database): integrate sqlite3, add setup.sql, and implement database functions - Added sqlite3 as a dependency in package.json. - Created setup.sql to define decks and cards tables. - Implemented database functions in database.js to manage decks and cards: - getAllDecks: retrieves all decks. - getDeckById: retrieves a specific deck by ID. - addDeck: inserts a new deck and returns it. - deleteDeck: removes a deck by ID. - getAllCardsForDeck: retrieves all cards for a specific deck. - addCard: inserts a new card and returns it. - markCardLearned: marks a card as learned. - deleteCard: removes a card by ID. --- task-2/data/flashcards.db | Bin 0 -> 16384 bytes task-2/migrate.js | 34 ++ task-2/package-lock.json | 1214 +++++++++++++++++++++++++++++++++++++ task-2/package.json | 3 +- task-2/setup.sql | 14 + task-2/src/database.js | 92 ++- 6 files changed, 1324 insertions(+), 33 deletions(-) create mode 100644 task-2/data/flashcards.db create mode 100644 task-2/migrate.js create mode 100644 task-2/package-lock.json create mode 100644 task-2/setup.sql diff --git a/task-2/data/flashcards.db b/task-2/data/flashcards.db new file mode 100644 index 0000000000000000000000000000000000000000..17f5982e0f2615f11d1e42ce2b70fc0ac7a406a9 GIT binary patch literal 16384 zcmeI3&2k$>5P(-d$d=0Ta!EPI<`9=ukx3wxq5=pZ%PapN%ZVgooE+@Y?%100YF3_E z$q}4foOuTdUVxY2z&&^F6mP(Vo{?p*eV}qoir%W-9nDWq_cyJ>Z1;3uv_#C|BvL~b 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card.answer, + card.learned ? 1 : 0, + card.deckId + ] + ); +}); + +db.close(); diff --git a/task-2/package-lock.json b/task-2/package-lock.json new file mode 100644 index 0000000..ddfd1f8 --- /dev/null +++ b/task-2/package-lock.json @@ -0,0 +1,1214 @@ +{ + "name": "flashcard-app", + "version": "1.0.0", + "lockfileVersion": 3, + "requires": true, + "packages": { + "": { + "name": "flashcard-app", + "version": "1.0.0", + "dependencies": { + "better-sqlite3": "^12.8.0", + "sqlite3": "^6.0.1" + } + }, + "node_modules/@gar/promise-retry": { + "version": "1.0.3", + "resolved": "https://registry.npmjs.org/@gar/promise-retry/-/promise-retry-1.0.3.tgz", + "integrity": "sha512-GmzA9ckNokPypTg10pgpeHNQe7ph+iIKKmhKu3Ob9ANkswreCx7R3cKmY781K8QK3AqVL3xVh9A42JvIAbkkSA==", + "license": "MIT", + "optional": true, + "engines": { + "node": "^20.17.0 || >=22.9.0" + } + }, + "node_modules/@isaacs/fs-minipass": { + "version": "4.0.1", + "resolved": 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b/task-2/src/database.js index a737fcb..e8587c2 100644 --- a/task-2/src/database.js +++ b/task-2/src/database.js @@ -1,17 +1,11 @@ -// database.js -// Your task: implement each function below using better-sqlite3. -// The function signatures are identical to storage.js so you can -// compare the two files side by side. -// -// When every function works correctly, `node app.js` should -// print exactly the same output as it did with storage.js. - -import Database from 'better-sqlite3'; -import { fileURLToPath } from 'url'; -import { dirname, join } from 'path'; + + +import Database from "better-sqlite3"; +import { fileURLToPath } from "url"; +import { dirname, join } from "path"; const __dirname = dirname(fileURLToPath(import.meta.url)); -const DB_FILE = join(__dirname, '../data/flashcards.db'); +const DB_FILE = join(__dirname, "../data/flashcards.db"); const db = new Database(DB_FILE); @@ -20,24 +14,25 @@ const db = new Database(DB_FILE); // ---------------------------------------------------------------- export function getAllDecks() { - // TODO: return all rows from the decks table - throw new Error('Not implemented'); + return db.prepare("SELECT * FROM decks").all(); } export function getDeckById(id) { - // TODO: return the deck row with the given id, or null if not found - throw new Error('Not implemented'); + const deck = db.prepare("SELECT * FROM decks WHERE id = ?").get(id); + return deck ?? null; // match storage.js behavior } export function addDeck(name, description) { - // TODO: insert a new deck and return the new row (including its id) - throw new Error('Not implemented'); + const info = db + .prepare("INSERT INTO decks (name, description) VALUES (?, ?)") + .run(name, description); + + return { id: info.lastInsertRowid, name, description }; } export function deleteDeck(deckId) { - // TODO: delete the deck with the given id - // return true if a row was deleted, false otherwise - throw new Error('Not implemented'); + const info = db.prepare("DELETE FROM decks WHERE id = ?").run(deckId); + return info.changes > 0; } // ---------------------------------------------------------------- @@ -45,23 +40,56 @@ export function deleteDeck(deckId) { // ---------------------------------------------------------------- export function getAllCardsForDeck(deckId) { - // TODO: return all card rows whose deckId matches - throw new Error('Not implemented'); + const cards = db + .prepare(` + SELECT id, question, answer, learned, deck_id AS deckId + FROM cards + WHERE deck_id = ? + `) + .all(deckId); + + + return cards.map(c => ({ ...c, learned: Boolean(c.learned) })); } export function addCard(question, answer, deckId) { - // TODO: insert a new card and return the new row (including its id) - throw new Error('Not implemented'); + const info = db + .prepare(` + INSERT INTO cards (question, answer, deck_id) + VALUES (?, ?, ?) + `) + .run(question, answer, deckId); + + const card = db + .prepare(` + SELECT id, question, answer, learned, deck_id AS deckId + FROM cards + WHERE id = ? + `) + .get(info.lastInsertRowid); + + card.learned = Boolean(card.learned); + return card; } export function markCardLearned(cardId) { - // TODO: set learned = 1 for the card with the given id - // return the updated row, or null if not found - throw new Error('Not implemented'); + const info = db.prepare("UPDATE cards SET learned = 1 WHERE id = ?").run(cardId); + + if (info.changes === 0) return null; + + const card = db + .prepare(` + SELECT id, question, answer, learned, deck_id AS deckId + FROM cards + WHERE id = ? + `) + .get(cardId); + + card.learned = true; + return card; } export function deleteCard(cardId) { - // TODO: delete the card with the given id - // return true if a row was deleted, false otherwise - throw new Error('Not implemented'); -} + const info = db.prepare("DELETE FROM cards WHERE id = ?").run(cardId); + return info.changes > 0; +} \ No newline at end of file