Question

我能够在.fsx脚本中运行一段代码。我从来没有看到它在我正在拉回的轨道数据上循环。所以我想我会把它放在.fs文件中并编译它。我遇到了两个问题。 F＃IDE在let query =行中强调type关键字和let。这是我的oode（下面）我的语法在哪里？

open System
open System.Data
open System.Data.Linq
open Microsoft.FSharp.Data.TypeProviders
open Microsoft.FSharp.Linq

[<EntryPoint>]
let main argv = 
    type dbSchema = SqlDataConnection<"Data Source=SQLDEV;Initial Catalog=CDDB;Integrated Security=SSPI;">
            let db = dbSchema.GetDataContext()
            // Enable the logging of database activity to the console.
            db.DataContext.Log <- System.Console.Out
            let query1 =
                query {
                    for row in db.SoundRecording do
                    select row
                    take 50
                }
            query1 |> Seq.iter (fun row -> printfn "%s - %s" row.DisplayArtist row.DisplayTitle)
            0 // return an integer exit code

Answer 1

这可能有效 - 您无法在函数

中包含类型定义

open System
open System.Data
open System.Data.Linq
open Microsoft.FSharp.Data.TypeProviders
open Microsoft.FSharp.Linq
type dbSchema = SqlDataConnection<"Data Source=SQLDEV;Initial Catalog=CDDB;Integrated Security=SSPI;">
[<EntryPoint>]
let main argv = 

            let db = dbSchema.GetDataContext()
            // Enable the logging of database activity to the console.
            db.DataContext.Log <- System.Console.Out
            let query1 =
                query {
                    for row in db.SoundRecording do
                    select row
                    take 50
                }
            query1 |> Seq.iter (fun row -> printfn "%s - %s" row.DisplayArtist row.DisplayTitle)
            0 // return an integer exit code

类型提供程序问题 - 主要入口点 - 语法

1 个答案: