zLMDB
zlmdb is a complete LMDB solution for Python providing two APIs in one package:
- Low-level py-lmdb compatible API - Direct LMDB access with full control
- High-level object-relational API - Type-safe ORM with automatic serialization
Key Features
Low-level LMDB API (py-lmdb compatible):
- Drop-in replacement for py-lmdb
- Direct access to LMDB transactions, cursors, and databases
- Full LMDB feature set (subdatabases, duplicate keys, etc.)
- Works with all py-lmdb examples and code
High-level Object-Relational API:
- Type-safe persistent objects with automatic serialization
- Multiple serializers (JSON, CBOR, Pickle, Flatbuffers)
- Export/import from/to Apache Arrow
- Native Numpy arrays and Pandas data frames support
- Automatic indexes and relationships
- Schema management
Implementation:
- CFFI-only (no CPyExt) for maximum compatibility
- Works on both CPython and PyPy
- Native binary wheels for x86-64 and ARM64
- Vendored LMDB (no external dependencies)
- High-performance with zero-copy operations
- Free software (MIT license)
Usage Examples
Low-level API (py-lmdb compatible):
import zlmdb.lmdb as lmdb
# Open database
env = lmdb.open('/tmp/mydb', max_dbs=10)
db = env.open_db(b'users')
# Write data
with env.begin(write=True) as txn:
txn.put(b'alice', b'alice@example.com', db=db)
txn.put(b'bob', b'bob@example.com', db=db)
# Read data
with env.begin() as txn:
email = txn.get(b'alice', db=db)
print(email) # b'alice@example.com'
High-level API (zlmdb ORM):
import zlmdb
# Define schema
class User(object):
def __init__(self, oid, name, email):
self.oid = oid
self.name = name
self.email = email
schema = zlmdb.Schema()
schema.users = zlmdb.MapUuidCbor(1, marshal=lambda obj: obj.__dict__)
# Use it
db = zlmdb.Database('/tmp/mydb', schema=schema)
with db.begin(write=True) as txn:
user = User(uuid.uuid4(), 'Alice', 'alice@example.com')
schema.users[txn, user.oid] = user
Cross-compilation and embedded targets
Status: roadmap. Building zLMDB from source with a cross toolchain (e.g.
Buildroot or Yocto, for riscv64) is intended to work, but is not yet tested
in CI. What already holds: the source distribution is self-contained (both
LMDB engines with their patches, and the FlatBuffers sources; CI builds it
from source on every commit), and zLMDB passes no architecture flags of its
own (no -march), so the toolchain's own flags apply unchanged. See
Native Build and Vendored Code
and Installation.
Development Workflow
This project uses just as a modern task runner and uv for fast Python package management.
Complete Recipe List
Virtual Environment Management:
- [x]
just create [venv]- Create Python venv (auto-detects system Python if no arg) - [x]
just create-all- Create all venvs (cpy314, cpy313, cpy312, cpy311, pypy311) - [x]
just version [venv]- Show Python version - [x]
just list-all- List all available Python runtimes
Installation:
- [x]
just install [venv]- Install zlmdb (runtime deps only) - [x]
just install-dev [venv]- Install in editable mode - [x]
just install-tools [venv]- Install dev tools (pytest, sphinx, etc.) - [x]
just install-all- Install in all venvs
Testing - LMDB: 🧪
- [x]
just test-examples-lmdb- Test all LMDB examples (in default venv) - [x]
just test-examples-lmdb-addressbook [venv]- Test example LMDB address book - [x]
just test-examples-lmdb-dirtybench [venv]- Test example LMDB dirtybench - [x]
just test-examples-lmdb-dirtybench-gdbm [venv]- Test example LMDB dirtybench-gdbm - [x]
just test-examples-lmdb-nastybench [venv]- Test example LMDB nastybench - [x]
just test-examples-lmdb-parabench [venv]- Test example LMDB parabench
Testing - ORM: 🧪
- [ ]
just test [venv]- Run full test suite (both test directories) - [ ]
just test-quick [venv]- Quick pytest run - [x]
just test-single [venv]- Run test_basic.py - [x]
just test-pmaps [venv]- Run pmap tests - [x]
just test-indexes [venv]- Run index tests - [x]
just test-select [venv]- Run select tests - [ ]
just test-zdb-etcd/df/dyn/fbs [venv]- Individual zdb tests - [ ]
just test-zdb [venv]- All zdb tests - [ ]
just test-all- Test in all venvs - [ ]
just coverage [venv]- Generate HTML coverage report
Code Quality: ✨
- [x]
just autoformat [venv]- Auto-format code with Ruff (modifies files!) - [x]
just check-format [venv]- Check formatting with Ruff (dry run) - [x]
just check-typing [venv]- Run static type checking with mypy
Building: 📦
- [x]
just build [venv]- Build wheel - [x]
just build-sourcedist [venv]- Build sdist - [x]
just build-all- Build wheels for all venvs - [!]
just dist [venv]- Build both sdist and wheels - [x]
just verify-wheels [venv]- Verify all built wheels.
Publishing: 🚀
- [ ]
just publish-release [venv]- Upload to PyPI with twine
Documentation: 📚
- [x]
just docs [venv]- Build HTML docs with Sphinx - [x]
just docs-view [venv]- Build and open in browser - [x]
just docs-clean- Clean doc build artifacts
Cleaning: 🧹
- [x]
just clean- Clean everything (alias for distclean) - [x]
just clean-build- Remove build/ dist/ *.egg-info - [x]
just clean-pyc- Remove *.pyc __pycache__ - [x]
just clean-test- Remove .coverage .pytest_cache - [x]
just distclean- Nuclear clean (removes venvs too!)
Utilities: 🔧
- [ ]
just update-flatbuffers- Update from deps/ submodule - [ ]
just generate-flatbuffers-reflection- Generate reflection code - [ ]
just fix-copyright- Update copyright headers - [ ]
just setup-completion- Setup bash tab completion
Quick Start
# Install just and uv (if not already installed)
curl --proto '=https' --tlsv1.2 -sSf https://just.systems/install.sh | bash
curl -LsSf https://astral.sh/uv/install.sh | sh
# Create virtual environment and install in development mode
just create
just install-dev
# Run tests
just test
# Build wheel
just build
Release files for zlmdb 26.10.1
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Source distribution (sdist)
| File | Size | Uploaded | |
|---|---|---|---|
| zlmdb-26.10.1.tar.gz | 2.4 MB | Details |
Built distributions (wheels)
Total release size: 69.5 MB
Release files / zlmdb-26.10.1.tar.gz
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