zlmdb v25.10.1 Released!

[oberstet]

🚀 zlmdb v25.10.1 Released!

We're excited to announce the release of zlmdb v25.10.1 - a complete LMDB solution for Python providing both low-level py-lmdb compatible APIs and high-level object-relational database capabilities!

📦 Quick Start

Install with pip (binary wheels available - no compilation needed!):

pip install zlmdb==25.10.1

🌟 Key Features

🔋 Batteries Included - Zero Dependencies

zlmdb ships with everything bundled - no system dependencies required:

• Vendored LMDB (OpenLDAP LMDB library) - Latest stable version built-in
• Vendored Flatbuffers - High-performance serialization included
• CFFI-only implementation - Works seamlessly on both CPython and PyPy

Just pip install and you're ready to go!

🎯 Two APIs in One Package

Low-level py-lmdb Compatible API:

• Drop-in replacement for py-lmdb
• Direct access to LMDB transactions, cursors, and databases
• Full LMDB feature set (subdatabases, duplicate keys, MDB_INTEGERKEY, etc.)

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 DataFrame support
• Automatic indexes and relationships

🏗️ Production-Ready Build System

This release features a completely rebuilt CI/CD pipeline with:

• Binary wheels for all platforms:

  • CPython 3.11, 3.12, 3.13, 3.14 (including free-threaded 3.14t)
  • PyPy 3.11
  • Linux (x86_64, aarch64) - manylinux wheels
  • macOS (x86_64, arm64/Apple Silicon)
  • Windows (x64)

• Automated release workflow with PyPI trusted publishing

• Comprehensive test suite across all Python versions and platforms

• Full documentation rebuilt and published to Read the Docs

📚 Updated Documentation

Complete documentation is now available at zlmdb.readthedocs.io including:

• Getting started guides
• API reference (both low-level and high-level APIs)
• Performance benchmarks
• Example code
• Migration guide from py-lmdb

🔗 Release Links

• 📋 Release Notes: https://github.com/crossbario/zlmdb/releases/tag/v25.10.1
• 🏷️ Source Code (tag): https://github.com/crossbario/zlmdb/tree/v25.10.1
• 📦 PyPI Package: https://pypi.org/project/zlmdb/25.10.1/
• 📖 Documentation: https://zlmdb.readthedocs.io/en/latest/

💡 Why zlmdb?

For py-lmdb Users

If you're using py-lmdb, zlmdb is a drop-in replacement with these advantages:

• ✅ Works on PyPy (py-lmdb doesn't due to CPyExt dependency)
• ✅ Binary wheels available (no compilation needed)
• ✅ Vendored LMDB (no system LMDB installation required)
• ✅ Same API - just change import lmdb to from zlmdb import lmdb

For New Projects

zlmdb provides a modern, high-level ORM for LMDB:

• Type-safe persistent objects
• Automatic serialization with multiple formats
• Schema management and migrations
• Integration with data science tools (Numpy, Pandas, Arrow)

For Performance-Critical Applications

• PyPy support for near-C performance with JIT compilation
• Zero-copy operations where possible
• LMDB's legendary performance: memory-mapped, ACID transactions, no write amplification
• Flatbuffers serialization for maximum speed

🙏 Acknowledgments

zlmdb builds on the excellent LMDB (Lightning Memory-Mapped Database) by Howard Chu and Symas Corp, and provides APIs compatible with the widely-used py-lmdb library.

🐛 Issues and Contributions

Found a bug or have a feature request? Please open an issue on our GitHub Issues page.

Contributions are welcome! Check out our Contributing Guide.

📜 License

zlmdb is open source and licensed under the MIT License.

---

Happy coding with zlmdb! 🎉

zlmdb is part of the WAMP project family and maintained by Crossbar.io.