node-lmdb

import { Env } from 'node-lmdb'; import * as fs from 'fs'; import * as path from 'path'; const dbPath = path.join(__dirname, 'mydata'); if (!fs.existsSync(dbPath)) { fs.mkdirSync(dbPath); } const env = new Env(); env.open({ path: dbPath, mapSize: 2 * 1024 * 1024 * 1024, // 2GB maximum database size maxDbs: 5 // Allow up to 5 named databases }); const dbi = env.openDbi({ name: 'myPrettyDatabase', create: true // Create the database if it doesn't exist }); try { let txn = env.beginTxn(); const key1 = 1; let value1 = txn.getString(dbi, key1); console.log(`Initial value for key ${key1}: ${value1}`); if (value1 === null) { txn.putString(dbi, key1, "Hello from node-lmdb!"); console.log(`Set value for key ${key1} to 'Hello from node-lmdb!'`); } else { txn.del(dbi, key1); console.log(`Deleted value for key ${key1}`); } const key2 = 'my_string_key'; txn.putBinary(dbi, key2, Buffer.from('Binary data example')); console.log(`Put binary data for key '${key2}'`); txn.commit(); // Commit the transaction // Read the binary data back in a new transaction txn = env.beginTxn(); const binaryValue = txn.getBinary(dbi, key2); console.log(`Retrieved binary data for key '${key2}': ${binaryValue?.toString()}`); txn.abort(); // Abort a read-only transaction } catch (e) { console.error('LMDB operation failed:', e); } finally { dbi.close(); env.close(); fs.rmSync(dbPath, { recursive: true, force: true }); // Clean up }