typelevel/doobie

Doobie is a functional, type-safe database access library for Scala that provides a clean, composable API for interacting with relational databases. It supports automatic derivation of database type mappings for common Scala types and offers deep integrations with PostgreSQL, H2, and MySQL, including specialized handling for JSON, geometric, and range data types. The system is designed for robustness, featuring built-in support for asynchronous cancellation, structured logging, and OpenTelemetry tracing. Additionally, it includes comprehensive testing utilities for verifying SQL queries and updates across multiple Scala versions and testing frameworks.

This period marks the comprehensive migration of the Doobie library to Cats Effect 3 and Scala 3, replacing the legacy Free monad-based API with a modern, effect-based approach. The codebase was significantly refactored to remove obsolete abstractions and introduce automated code generation for algebraic structures, while simultaneously expanding support for PostgreSQL, H2, and other databases with new high-level APIs and type mappings.

23 changes

This period focused on modernizing the codebase for Scala 3 compatibility and expanding PostgreSQL type support. Key changes included migrating package structures, adding Scala 3-specific derivation for Postgres Text types, and introducing a WeakAsync typeclass for improved cancellation semantics. The work was heavily supported by extensive test coverage for these new features and utilities.

21 changes

This period focused on expanding Doobie's ecosystem by adding integration modules for munit, weaver, and otel4s, alongside new features for PostgreSQL ranges, MySQL date types, and H2 JSON support. A significant portion of the work involved comprehensive test coverage for these new features, as well as adding test utilities and platform-specific test suites across the codebase.

19 changes

typelevel/doobie was measured the same way every project in this corpus was: the same rubric, at a pinned commit, with the result published in full. Point the surveyor at a repository you know and see whether you agree with it.