test.scala

import scala.slick.driver.JdbcDriver.simple._

val db = Database.forURL("jdbc:h2:mem:slicktest", driver = "org.h2.Driver")

implicit val session = db.createSession()
session.close()

db.withSession { implicit session =>
  // query 
}

db.withTransaction { implicit session =>
  // query
}

val connection: java.sql.Connection = db.createConnection()
connection.close()