Generate type-safe Haskell code from SQL via https://github.com/sqlc-dev/sqlc.

sqlc-hs

A Haskell code generator plugin for sqlc, allowing you to generate idiomatic Haskell types and functions directly from your SQL queries.

It leverages postgresql-simple, mysql-simple, and sqlite-simple, generating a thin layer on top of these well-known libraries.

Use below configuation in your sqlc.yaml to use sqlc-hs. Refer to the sqlc documentation for more information

version: '2'
plugins:
  - name: haskell
    process:
      cmd: sqlc-hs

Use the plugin for your schemas like so

  codegen:
  - out: gen
    plugin: haskell
    options:
      cabal_package_name: your-package
      cabal_package_version: 0.1.0.0
      haskell_module_prefix: Database.Queries
      overrides:
        db_type: bytea
        haskell_type:
          package: bytestring
          module: Data.ByteString
          type: Data.ByteString.ByteString

Ensure that the sqlc-hs executable is on your PATH when invoking sqlc.

(Re-)Generate proto files with proto-lens

$ protoc --plugin=protoc-gen-haskell=`cabal exec which proto-lens-protoc` --haskell_out=sqlc-hs-protos/ protos/codegen.proto