abstract-level

import { Level } from 'level'; import type { AbstractLevel, AbstractBatchOperation } from 'abstract-level'; interface MyValue { x: number; name: string; } async function runDbExample() { // In a real application, replace 'level' with your chosen LevelDB implementation. // The generic types specify key and value types. const db: AbstractLevel<string, MyValue> = new Level<string, MyValue>('./my-db-path', { valueEncoding: 'json' // This will automatically JSON.stringify/parse values }); try { console.log('Opening database...'); await db.open(); await db.put('item1', { x: 1, name: 'First Item' }); await db.put('item2', { x: 2, name: 'Second Item' }); const value1 = await db.get('item1'); console.log(`Value for item1: ${JSON.stringify(value1)}`); // Batch operations const batchOperations: AbstractBatchOperation<string, MyValue>[] = [ { type: 'put', key: 'item3', value: { x: 3, name: 'Third Item' } }, { type: 'del', key: 'item1' } ]; await db.batch(batchOperations); const value3 = await db.get('item3'); console.log(`Value for item3: ${JSON.stringify(value3)}`); const deletedValue = await db.get('item1'); console.log(`Value for item1 after delete (should be undefined): ${deletedValue}`); console.log('Iterating through remaining items:'); for await (const [key, value] of db.iterator()) { console.log(`Key: ${key}, Value: ${JSON.stringify(value)}`); } } catch (error) { console.error('Database operation failed:', error); } finally { console.log('Closing database...'); await db.close(); } } runDbExample();