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  • package root
    Definition Classes
    root
  • package skunk

    Skunk is a functional data access layer for Postgres.

    Skunk is a functional data access layer for Postgres.

    Design principles:

    • Skunk doesn't use JDBC. It speaks the Postgres wire protocol. It will not work with any other database back end.
    • Skunk is asynchronous all the way down, via cats-effect, fs2, and ultimately nio. The high-level network layers (Protocol and Session) are safe to use concurrently.
    • Serialization to and from schema types is not typeclass-based, so there are no implicit derivations. Codecs are explicit, like parser combinators.
    • I'm not sweating arity abstraction that much. Pass a ~ b ~ c for three args and Void if there are no args. This may change in the future but it's fine for now.
    • Skunk uses Resource for lifetime-managed objects, which means it takes some discipline to avoid leaks, especially when working concurrently. May or may not end up being problematic.
    • I'm trying to write good Scaladoc this time.

    A minimal example follows. We construct a Resource that yields a Session, then use it.

    package example

import cats.effect._
import skunk._
import skunk.implicits._
import skunk.codec.numeric._

object Minimal extends IOApp {

  val session: Resource[IO, Session[IO]] =
    Session.single(
      host     = "localhost",
      port     = 5432,
      user     = "postgres",
      database = "world",
    )

  def run(args: List[String]): IO[ExitCode] =
    session.use { s =>
      for {
        n <- s.unique(sql"select 42".query(int4))
        _ <- IO(println(s"The answer is $n."))
      } yield ExitCode.Success
    }

}

    Continue reading for an overview of the library. It's pretty small.

    Definition Classes
    root
  • package util
    Definition Classes
    skunk
  • object Typer
    Definition Classes
    util
  • ProtocolOps
  • Strategy
  • TypeInfo

object Strategy

Source
Typer.scala
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  4. implicit val OrderStrategy: Order[Strategy]
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  21. object BuiltinsOnly extends Strategy with Product with Serializable

    This strategy supports built-in Postgres types only, and does not need a database round-trip for initialization.

    This strategy supports built-in Postgres types only, and does not need a database round-trip for initialization. This is the fastest strategy and is appropriate when you are not using any user-defined types (this includes enums).

  22. object SearchPath extends Strategy with Product with Serializable

    This strategy supports built-in Postgres types, as well as types that are defined in namespaces on the session search path.

    This strategy supports built-in Postgres types, as well as types that are defined in namespaces on the session search path. This is the default strategy.

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