Slick 3.0.0 - update row with only non-null values

Question

Having a table with the columns

class Data(tag: Tag) extends Table[DataRow](tag, \"data\") {
  def id = column[Int](\"id\", O.PrimaryKey)
  def name = column         


        

Answer 1

As I commented the question is similar to an existing one, but you don't seem to have any extra requirements.

The simplest approach is just SELECT + UPDATE. For example you add a patch function in your DataRow class defining how you want to update your model

      def patch(name: Option[String], state: Option[State], price: Option[Int]): Data {
         this.copy(name = name.getOrElse(this.name), ...)
      }

And you add a partialUpdate method in your repo class

class DataRepo {
  private val Datas = TableQuery[Data]
  val db = ???

  def partialUpdate(id: Int, name: Option[String], state: Option[State], price: Option[Int]): Future[Int] = {
    val query = Datas.filter(_.id === id)
    for {
      data <- db.run(query.result.head)
      result <- db.run(query.update(data.patch(name, state, price)))
    } yield result
  }

}

As you see the main problem of this solution is that there are 2 SQL statements, SELECT and UPDATE.

Other solution is to use plain SQL (http://slick.typesafe.com/doc/3.0.0/sql.html) but of course this gives other problems.