Хранилище данных в React Native: AsyncStorage, MMKV, SQLite

1npm install @react-native-async-storage/async-storage

1import AsyncStorage from '@react-native-async-storage/async-storage';
2
3// Сохранение
4await AsyncStorage.setItem('user_token', 'abc123');
5await AsyncStorage.setItem('user_profile', JSON.stringify({
6  name: 'John',
7  email: 'john@example.com',
8}));
9
10// Чтение
11const token = await AsyncStorage.getItem('user_token');
12const profile = JSON.parse(await AsyncStorage.getItem('user_profile'));
13
14// Удаление
15await AsyncStorage.removeItem('user_token');
16
17// Очистка всех данных
18await AsyncStorage.clear();

1npm install react-native-mmkv

1import { MMKV } from 'react-native-mmkv';
2
3const storage = new MMKV();
4
5// Сохранение
6storage.set('user.name', 'John');
7storage.set('user.age', 30);
8storage.set('user.profile', JSON.stringify({ email: 'john@example.com' }));
9
10// Чтение
11const name = storage.getString('user.name'); // 'John'
12const age = storage.getNumber('user.age'); // 30
13const profile = JSON.parse(storage.getString('user.profile'));
14
15// Удаление
16storage.delete('user.name');
17
18// Проверка наличия ключа
19const hasKey = storage.contains('user.name'); // true/false

1npm install react-native-sqlite-storage

1import SQLite from 'react-native-sqlite-storage';
2
3const db = await SQLite.openDatabase({ name: 'app.db' });
4
5// Создание таблицы
6await db.executeSql(`
7  CREATE TABLE IF NOT EXISTS users (
8    id INTEGER PRIMARY KEY AUTOINCREMENT,
9    name TEXT NOT NULL,
10    email TEXT UNIQUE,
11    created_at DATETIME DEFAULT CURRENT_TIMESTAMP
12  )
13`);

1// INSERT
2await db.executeSql(
3  'INSERT INTO users (name, email) VALUES (?, ?)',
4  ['John', 'john@example.com']
5);
6
7// SELECT
8const [results] = await db.executeSql('SELECT * FROM users');
9const users = results.rows.raw();
10
11// UPDATE
12await db.executeSql(
13  'UPDATE users SET name = ? WHERE id = ?',
14  ['Jane', 1]
15);
16
17// DELETE
18await db.executeSql('DELETE FROM users WHERE id = ?', [1]);

1await db.executeSql(`
2  CREATE TABLE IF NOT EXISTS migrations (
3    version INTEGER PRIMARY KEY,
4    applied_at DATETIME DEFAULT CURRENT_TIMESTAMP
5  )
6`);
7
8const currentVersion = await getCurrentVersion(db);
9if (currentVersion < 2) {
10  await db.executeSql('ALTER TABLE users ADD COLUMN avatar TEXT');
11  await db.executeSql('INSERT INTO migrations (version) VALUES (2)');
12}