Support explicit transactions

It would be great if we could add support for explicit custom transactions (http://www.npgsql.org/doc/transactions.html) to issue multiple nonqueries within one transaction. As far as I can see all executeNonQuery functions always just use List.head SqlProps.queries.

I am not sure about the API for this feature. It could be let executeNonQueryMany (props: SqlProps) : int list =

What do you think?

[rommsen]

Awesome. Love it. Will probably use this API for pretty much all non queries. So flexible and composable

module PersistentReadmodels =
  open Infrastructure
  open Domain
  open Npgsql.FSharp

  let parameters eventEnvelope =
    match eventEnvelope.Event with
    | Flavour_sold (Truck truck,flavour) ->
        [
          "@truck", SqlValue.Uuid truck
          "@flavour", SqlValue.String (Flavour.toString flavour)
        ] |> Some

    | _ -> None

  let flavourSoldListener (DB_Connection_String db_connection) : EventListener<Event> =
    let query = """
      INSERT INTO flavours_sold (truck, flavour, sold) VALUES (@truck, @flavour, 1)
      ON CONFLICT (truck,flavour) DO UPDATE SET sold = flavours_sold.sold + 1"""

    fun eventEnvelopes ->
      let parameters =
        eventEnvelopes |> List.choose parameters

      if not <| List.isEmpty parameters then
        db_connection
        |> Sql.connect
        |> Sql.executeTransactionAsync [ query, parameters ]
        |> Async.Ignore
      else
        async { return () }

[rommsen]

Awesome. Will try later