Top 3 persistence-layer Open-Source Projects

Hanami::Model

1 445 0.0 Ruby

Ruby persistence framework with entities and repositories
Permazen

10 396 9.2 HTML

Language-Natural Persistence Layer for Java

Project mention: ORMs are nice but they are the wrong abstraction | news.ycombinator.com | 2024-02-01

The most interesting/fresh approach I've seen to this problem is Permazen.
https://github.com/permazen/permazen/
It starts by asking what the most natural way is to integrate persistence with a programming language (Java in this case, but the concepts are generic), and then goes ahead and implements the features of an RDBMS as an in-process library that can be given different storage backends as long as they implement a sorted K/V store. So it can sit on top of a simple in-process file based K/V store, RocksDB, FoundationDB, or any SQL database like PostgreSQL, SQLite, Spanner, etc (it just uses the RDBMS to store sorted key/value pairs in that case).
Essentially it's a way to map object graphs to key/value pairs but with the usual features you'd want like indexing, validation, transactions, and so on. The design is really nice and can scale from tiny tasks you'd normally use JSON or object serialization for, all the way up to large distributed clusters.
Because the native object model is mapped directly to storage there's no object/relational mismatch.
InfluxDB

www.influxdata.com
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PolysemyCleanArchitecture

4 186 0.0 Haskell

Showcasing how the Polysemy library can be used to implement a REST application conforming to the guidelines of the Clean Architecture model.

Project mention: What is the best web framework in the statically typed functional programming world? | /r/functionalprogramming | 2023-12-05

Another benefit of its architecture is that it was easy to plug an algebraic effects library on it (Implementing Clean Architecture with Haskell and Polysemy).

NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020). The latest post mention was on 2024-02-01.