From 467c0b71f9e54edd1aff6cb7b662be28df625549 Mon Sep 17 00:00:00 2001 From: mohammedalfakih-dev Date: Wed, 1 Apr 2026 23:34:53 +0200 Subject: [PATCH] task-1&2Done --- task-1/queries.sql | 37 ++- task-2/data/flashcards.db | Bin 0 -> 16384 bytes task-2/migrate.js | 42 ++++ task-2/package-lock.json | 467 ++++++++++++++++++++++++++++++++++++++ task-2/setup.sql | 14 ++ task-2/src/database.js | 81 ++++--- 6 files changed, 608 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-1/queries.sql b/task-1/queries.sql index fecf7ad..a7b3b33 100644 --- a/task-1/queries.sql +++ b/task-1/queries.sql @@ -1,21 +1,54 @@ ----- Queries +-- 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 books.title, authors.first_name || ' ' || authors.last_name AS author +FROM books +JOIN authors ON books.author_id = authors.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 books.title, books.published_year +FROM books +JOIN authors ON books.author_id = authors.id +WHERE authors.first_name = 'Stephen' AND authors.last_name = 'King' +ORDER BY books.published_year ASC; -- **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 ('Zeus', 'Moha', 'Yemeni', 2002); -- **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 HackYourFuture Story: My Transformation into a Developer', + 2026, + 'Education', + (SELECT id FROM authors WHERE first_name = 'Zeus' AND last_name = 'Moha') +); -- **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'; --- **Question 8** — Delete the book you added in Question 6. Make sure your query targets only that specific row. +SELECT title, genre +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 title = 'The HackYourFuture Story: My Transformation into a Developer' + AND author_id = (SELECT id FROM authors WHERE first_name = 'Zeus' AND last_name = 'Moha'); --- -- ### Bonus questions _(optional)_ diff --git a/task-2/data/flashcards.db b/task-2/data/flashcards.db new file mode 100644 index 0000000000000000000000000000000000000000..61db221e090051742c16dc08c2a47e7597591587 GIT binary patch literal 16384 zcmeI3&2A$_5XWci!HKgt!!6ee5=*Rg*hPClEASe}8RrAX*|ld05r?Eb)3I9__c+~S z2a8ic9C-@ffHP0PjRP;i9SMmG)$KTORx2cKSyUs>Y5g-CYfCvzQdr9ECTz+Y7ZO#2Y%2+Sq5mT|Y7q8I?>R|w3eXA9KErN{|z(d5a z*A9c7paU;Ddk6K-F?={Etae|vpgEQ?uIy#T5`CmZW}3we{~s{T0e?m)!S$x= zIghLRY{I&BsSjJ$O(Rtt7D`b>#7CJn>;IhphvWZ=7dnUl5g-CYfCvx)B0vO)01+Sp zM1Tkofw!DMF_&L+ZI;G^qKl60U|&IhyW2F0z`la5CJ0a|0l5jpx`{dSay#FxTjfYU>I{94n4 z6nMf-Xm;k$R9=c~V1vC_TES3mY{I$~?5AR`D!^n6L#Fyd<{QO=^U2rOF5(o`F!(GM 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+const db = new Database(DB_FILE); + +const insertDeck = db.prepare( + "INSERT INTO decks (id, name, description) VALUES (?, ?, ?)", +); + +const insertCard = db.prepare( + "INSERT INTO cards (id, question, answer, learned, deck_id) VALUES (?, ?, ?, ?, ?)", +); + +const migrate = db.transaction(() => { + for (const deck of data.decks) { + insertDeck.run(deck.id, deck.name, deck.description); + } + + for (const card of data.cards) { + insertCard.run( + card.id, + card.question, + card.answer, + card.learned ? 1 : 0, + card.deckId, + ); + } +}); + +migrate(); + +console.log("Migration completed."); diff --git a/task-2/package-lock.json b/task-2/package-lock.json new file mode 100644 index 0000000..72fc35b --- /dev/null +++ b/task-2/package-lock.json @@ -0,0 +1,467 @@ +{ + "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" + } + 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a/task-2/src/database.js +++ b/task-2/src/database.js @@ -1,17 +1,9 @@ -// 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 +12,28 @@ 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'); + return db.prepare("SELECT * FROM decks WHERE id = ?").get(id) ?? null; } 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: Number(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 +41,46 @@ export function deleteDeck(deckId) { // ---------------------------------------------------------------- export function getAllCardsForDeck(deckId) { - // TODO: return all card rows whose deckId matches - throw new Error('Not implemented'); + return db + .prepare( + "SELECT id, question, answer, learned, deck_id AS deckId FROM cards WHERE deck_id = ?", + ) + .all(deckId); } 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, learned, deck_id) VALUES (?, ?, 0, ?)", + ) + .run(question, answer, deckId); + + return { + id: Number(info.lastInsertRowid), + question, + answer, + learned: 0, + deckId, + }; } 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; + } + + return db + .prepare( + "SELECT id, question, answer, learned, deck_id AS deckId FROM cards WHERE id = ?", + ) + .get(cardId); } 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; }