JPA

jpa.scala

import javax.persistence._

object JPA {

  val unit = "jpa"
  val emf = Persistence.createEntityManagerFactory(unit)

  def t[R](f: EntityManager => R) = {
    val em = emf.createEntityManager
    val transaction = em.getTransaction
    transaction.begin
    // Before
    val res = f(em)
    // After
    transaction.commit
    em.close
    res
  }

  def em[R](f: EntityManager => R) = {
    val em = emf.createEntityManager
    // Before
    val res = f(em)
    // After
    em.close
    res
  }
}