lmdb

import lmdb import os import shutil db_path = './my_lmdb_data' # Ensure cleanup for demonstration if os.path.exists(db_path): shutil.rmtree(db_path) # 1. Open an LMDB environment # map_size: Maximum size of the database. Crucial to set correctly. # max_dbs: Max number of named databases (sub-databases). env = lmdb.open(db_path, map_size=10*1024*1024, max_dbs=10, subdir=True) # 2. Write data to the database with env.begin(write=True) as txn: txn.put(b'my_key_1', b'my_value_1') txn.put(b'my_key_2', b'my_value_2') txn.put(b'another_key', b'another_value') print("Wrote data to LMDB.") # 3. Read data from the database with env.begin() as txn: value1 = txn.get(b'my_key_1') value_non_existent = txn.get(b'non_existent_key') print(f"Value for my_key_1: {value1.decode('utf-8') if value1 else None}") print(f"Value for non_existent_key: {value_non_existent}") # Iterate through all key-value pairs print("\nAll items in DB:") for key, value in txn.cursor(): print(f" {key.decode('utf-8')}: {value.decode('utf-8')}") # 4. Close the environment env.close() print("\nLMDB environment closed.") # Cleanup (optional, for examples) if os.path.exists(db_path): shutil.rmtree(db_path) print(f"Cleaned up database at {db_path}")