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LmdbBackend

class mmengine.fileio.LmdbBackend(db_path, readonly=True, lock=False, readahead=False, **kwargs)[source]

Lmdb storage backend.

Parameters
  • db_path (str) – Lmdb database path.

  • readonly (bool) – Lmdb environment parameter. If True, disallow any write operations. Defaults to True.

  • lock (bool) – Lmdb environment parameter. If False, when concurrent access occurs, do not lock the database. Defaults to False.

  • readahead (bool) – Lmdb environment parameter. If False, disable the OS filesystem readahead mechanism, which may improve random read performance when a database is larger than RAM. Defaults to False.

  • **kwargs – Keyword arguments passed to lmdb.open.

db_path

Lmdb database path.

Type

str

get(filepath)[source]

Get values according to the filepath.

Parameters

filepath (str or Path) – Here, filepath is the lmdb key.

Returns

Expected bytes object.

Return type

bytes

Examples

>>> backend = LmdbBackend('path/to/lmdb')
>>> backend.get('key')
b'hello world'
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