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F# 3.0 - EntityFramework Type Provider usage with Northwind DB

A small sample how to use F# 3.0 Entity Framework (EF) Type Provider. Visual Studio 11 Beta (and Northwind sample database) needed.

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(*
#r "System.Data.Entity.dll"
#r "FSharp.Data.TypeProviders.dll"
*)
open System
open Microsoft.FSharp.Data.TypeProviders

module Queries =
 
    [<Literal>] 
    let connectionstring = "Server=localhost;Initial Catalog=Northwind;Integrated Security=SSPI;MultipleActiveResultSets=true"
    
    //<interactive at once>
    type private EntityConnection = SqlEntityConnection<ConnectionString=connectionstring, Pluralize = true>
    
    let fetchCustomers = 
        let context = EntityConnection.GetDataContext()

        query { for customer in context.Customers do
                where (customer.Country = "Finland")
                select (customer.ContactName, customer.CompanyName) }
    //</interactive at once>

    let show = fetchCustomers |> Seq.iter (fun i -> Console.WriteLine("Customer: " + fst i + ", Company: " + snd i))

(* Output:

Customer: Pirkko Koskitalo, Company: Wartian Herkku
Customer: Matti Karttunen, Company: Wilman Kala

val show : unit = ()
*)

namespace System

namespace Microsoft

namespace Microsoft.FSharp

namespace Microsoft.FSharp.Data

module Queries

from Script

Multiple items
type LiteralAttribute =
inherit Attribute
new : unit -> LiteralAttribute

Full name: Microsoft.FSharp.Core.LiteralAttribute

--------------------
new : unit -> LiteralAttribute

val connectionstring : string

Full name: Script.Queries.connectionstring

type private EntityConnection = obj

Full name: Script.Queries.EntityConnection

val fetchCustomers : Linq.IQueryable<string * string>

Full name: Script.Queries.fetchCustomers

val context : obj

val query : Linq.QueryBuilder

Full name: Microsoft.FSharp.Core.ExtraTopLevelOperators.query

val customer : obj

custom operation: where (bool)

Calls Linq.QueryBuilder.Where

custom operation: select ('Result)

Calls Linq.QueryBuilder.Select

val show : unit

Full name: Script.Queries.show

module Seq

from Microsoft.FSharp.Collections

val iter : action:('T -> unit) -> source:seq<'T> -> unit

Full name: Microsoft.FSharp.Collections.Seq.iter

val i : string * string

type Console =
  static member BackgroundColor : ConsoleColor with get, set
  static member Beep : unit -> unit + 1 overload
  static member BufferHeight : int with get, set
  static member BufferWidth : int with get, set
  static member CapsLock : bool
  static member Clear : unit -> unit
  static member CursorLeft : int with get, set
  static member CursorSize : int with get, set
  static member CursorTop : int with get, set
  static member CursorVisible : bool with get, set
  ...

Full name: System.Console

Console.WriteLine() : unit
   (+0 other overloads)
Console.WriteLine(value: string) : unit
   (+0 other overloads)
Console.WriteLine(value: obj) : unit
   (+0 other overloads)
Console.WriteLine(value: uint64) : unit
   (+0 other overloads)
Console.WriteLine(value: int64) : unit
   (+0 other overloads)
Console.WriteLine(value: uint32) : unit
   (+0 other overloads)
Console.WriteLine(value: int) : unit
   (+0 other overloads)
Console.WriteLine(value: float32) : unit
   (+0 other overloads)
Console.WriteLine(value: float) : unit
   (+0 other overloads)
Console.WriteLine(value: decimal) : unit
   (+0 other overloads)

val fst : tuple:('T1 * 'T2) -> 'T1

Full name: Microsoft.FSharp.Core.Operators.fst

val snd : tuple:('T1 * 'T2) -> 'T2

Full name: Microsoft.FSharp.Core.Operators.snd

Raw view Test code New version

More information

Link:	http://fssnip.net/bC
Posted:	12 years ago
Author:	Tuomas Hietanen
Tags:	type provider , ef , entityframework , sql , f# 3.0 , database