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adamw/t11.scala

Last active September 20, 2019 06:19
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t11.scala
val countPersons: ConnectionIO[Int] =
sql"SELECT COUNT(*) FROM persons".query[Int].unique
val callFromCount: ConnectionIO[IO[Unit]] = countPersons.map { count =>
if (count == 0) IO(println("No users!")) else IO(println(s"Found $count users"))
}
val showResults: IO[Unit] = callFromCount.transact(transactor).flatten
showResults.unsafeRunSync()
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