SlickでJDBCドライバを実行時に切り替えるメモ(ver. 2.x) ref: http://qiita.com/mather314/items/f3c1c465aa0b74f10236

Database.scala

trait DatabaseComponent { this: Profile =>
  def database: profile.simple.Database
}

// テスト時
trait H2DatabaseComponent extends DatabaseComponent {
  import profile.simple._

  def database = Database.forURL("jdbc:h2:mem:test")
}

// 稼働時など
trait DbcpBasicDatabaseComponent extends DatabaseComponent {
  import profile.simple._
　import org.apache.commons.dbcp2.BasicDataSource

  def database = {
    val ds = new BasicDataSource
    ds.setDriverClassName(driverClassName)
    // ...
    Database.forDataSource(ds)
  }
}

file0.scala

import scala.slick.driver.PostgresDriver.simple._

// データモデル
case class User(id: Int, name: String)

// テーブル定義
class UserTable(tag: Tag) extends Table[User](tag, "users") {
  def id = column[Int]("id", O.PrimaryKey, O.AutoInc)
  def name = column[String]("name")
  def * = (id, name) <> (User.tupled, User.unapply) 
}

// クエリ実行オブジェクト
val Users = TableQuery[UserTable]

file1.scala

import scala.slick.driver.H2Driver.simple._

Database.forURL("jdbc:h2:mem:test", driver = "org.h2.Driver") withSession { implicit session =>
  // 定義時とドライバが合わないのでコンパイルエラー
  Users.insert(User(-1, "sample")) 
}

file2.txt

JdbcProfile -> JdbcDriver(class) -> PostgresDriver(class), H2Driver(class), ...
                 JdbcDriver(object)   PostgresDriver(object)  H2Driver(object) ...            

file5.scala

trait H2Profile extends Profile {
  val profile = H2Driver
}

trait PostgresProfile extends Profile {
  val profile = PostgresDriver
}

file6.scala

class SomeService { this: UserTableComponent =>
  // UserTableの処理
}

// サービスクラスのインスタンス化
object SomeService extends SomeService with UserTableComponent with PostgresProfile

Profile.scala

trait Profile {
  def profile: JdbcProfile
  def driverClassName: String
}

UserTable.scala

trait UserTableComponent { this: Profile =>
  import profile.simple._

  // UserTableの定義を内包
}