C#/Xamarin Maui

[Xamarin] Import DB File

kjun.kr 2020. 6. 1. 00:19
728x90

폰에서 로컬 DB 파일을 가지고 처리를 할때

미리 데이터를 담아놓고 처리를 할 필요가 생기는데요

이때 미리 데이터를 담아둔 DB(SQLite) 파일을

앱 설치시 폰에 위치시키는 방법을 소개합니다.

 

먼저 TEXT.db SQLite db  파일을 준비합니다.

준비한 DB 파일을 각 기기별로 아래와 같이 파일을 갖다 놓습니다.

 

Android 는 Asset 폴더에 위치시킵니다.

 

 

iOS 는 Resources 폴더에 위치시킵니다.

 

 

Android 의 MainActivity.cs 에 아래 처럼 코딩합니다.

 

using System.IO;

 

using Android.App;

using Android.Content.PM;

using Android.OS;

using Android.Runtime;

 

namespace ImportDbFile.Droid

{

    [Activity(Label = "ImportDbFile", Icon = "@mipmap/icon", Theme = "@style/MainTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]

    public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity

    {

        protected override void OnCreate(Bundle savedInstanceState)

        {

            TabLayoutResource = Resource.Layout.Tabbar;

            ToolbarResource = Resource.Layout.Toolbar;

 

            base.OnCreate(savedInstanceState);

 

            Xamarin.Essentials.Platform.Init(this, savedInstanceState);

 

            string path = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal);

            string dbPath = Path.Combine(path, "TEST.db");

 

            CopyDatabaseIfNotExists(dbPath);

 

            global::Xamarin.Forms.Forms.Init(this, savedInstanceState);

            LoadApplication(new App());

        }

 

        public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Android.Content.PM.Permission[] grantResults)

        {

            Xamarin.Essentials.Platform.OnRequestPermissionsResult(requestCode, permissions, grantResults);

 

            base.OnRequestPermissionsResult(requestCode, permissions, grantResults);

        }

 

        /// <summary>

        /// DB 파일을 복사합니다.

        /// </summary>

        /// <param name="dbPath"></param>

        private static void CopyDatabaseIfNotExists(string dbPath)

        {

            if (!File.Exists(dbPath))

            {

                using (var br = new BinaryReader(Application.Context.Assets.Open("TEST.db")))

                {

                    using (var bw = new BinaryWriter(new FileStream(dbPath, FileMode.Create)))

                    {

                        byte[] buffer = new byte[2048];

                        int length = 0;

                        while ((length = br.Read(buffer, 0, buffer.Length)) > 0)

                        {

                            bw.Write(buffer, 0, length);

                        }

                    }

                }

            }

        }

    }

}

 

 

iOS 의 AppDelegate.cs 에 아래 처럼 코딩합니다.

 

using System;

using System.IO;

 

using Foundation;

 

using UIKit;

 

namespace ImportDbFile.iOS

{

    // The UIApplicationDelegate for the application. This class is responsible for launching the

    // User Interface of the application, as well as listening (and optionally responding) to

    // application events from iOS.

    [Register("AppDelegate")]

    public partial class AppDelegate : global::Xamarin.Forms.Platform.iOS.FormsApplicationDelegate

    {

        //

        // This method is invoked when the application has loaded and is ready to run. In this

        // method you should instantiate the window, load the UI into it and then make the window

        // visible.

        //

        // You have 17 seconds to return from this method, or iOS will terminate your application.

        //

        public override bool FinishedLaunching(UIApplication app, NSDictionary options)

        {

            global::Xamarin.Forms.Forms.Init();

 

            string docFolder = Environment.GetFolderPath(Environment.SpecialFolder.Personal);

 

            if (!Directory.Exists(docFolder))

            {

                Directory.CreateDirectory(docFolder);

            }

 

            string dbPath = Path.Combine(docFolder, "TEST.db");

 

            CopyDatabaseIfNotExists(dbPath);

 

            LoadApplication(new App());

 

            return base.FinishedLaunching(app, options);

        }

 

        /// <summary>

        /// 해당 경로에 DB 파일을 복사합니다.

        /// </summary>

        /// <param name="dbPath"></param>

        private void CopyDatabaseIfNotExists(string dbPath)

        {

            if (!File.Exists(dbPath))

            {

                var existingDb = NSBundle.MainBundle.PathForResource("TEST", "db");

                File.Copy(existingDb, dbPath);

            }

        }

    }

}

 

 

DB 파일 복사하기 전

iOS / Android

 

 

 

DB 파일 복사 후

iOS / Android

 

    

 

 

 

소스

https://github.com/kei-soft/ImportDbFile

 

728x90