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  • 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
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object Text

Source
Text.scala
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Type Members

  1. case class Segment(style: String, body: String) extends Product with Serializable

Value Members

  1. final def !=(arg0: Any): Boolean
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  2. final def ##: Int
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  3. final def ==(arg0: Any): Boolean
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  4. implicit val MonoidText: Monoid[Text]
  5. def apply(body: String): Text
  6. final def asInstanceOf[T0]: T0
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  7. lazy val blue: (String) => Text
  8. def clone(): AnyRef
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    protected[lang]
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    @throws(classOf[java.lang.CloneNotSupportedException]) @native()
  9. lazy val cyan: (String) => Text
  10. val empty: Text
  11. final def eq(arg0: AnyRef): Boolean
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  12. def equals(arg0: AnyRef): Boolean
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  13. def finalize(): Unit
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  14. final def getClass(): Class[_ <: AnyRef]
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    @native()
  15. lazy val green: (String) => Text
  16. def grid(rows: List[List[Text]]): List[Text]
  17. def hashCode(): Int
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    @native()
  18. final def isInstanceOf[T0]: Boolean
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  19. lazy val magenta: (String) => Text
  20. final def ne(arg0: AnyRef): Boolean
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  21. final def notify(): Unit
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    @native()
  22. final def notifyAll(): Unit
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    @native()
  23. def padding(n: Int): Text
  24. lazy val plain: (String) => Text
  25. lazy val red: (String) => Text
  26. def styled(style: String, body: String): Text
  27. final def synchronized[T0](arg0: => T0): T0
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  28. def toString(): String
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  29. final def wait(): Unit
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    @throws(classOf[java.lang.InterruptedException])
  30. final def wait(arg0: Long, arg1: Int): Unit
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  31. final def wait(arg0: Long): Unit
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    @throws(classOf[java.lang.InterruptedException]) @native()
  32. lazy val yellow: (String) => Text
  33. object Segment extends Serializable

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