2017-10-09 82 views
0

我是Xamarin的新手,嘗試創建一個APP。當我嘗試在7以下的Android中創建SQLite數據庫時,它完美地工作。但是當我試圖在7和7.1中創建一個數據庫然後得到錯誤。對於這個問題, link in Xamarin discussion forum我整合代碼獲取錯誤以獲取Android 7中的數據庫連接+

public SQLite.Net.SQLiteConnection GetConnection() 
    { 

     var sqliteFilename = "ADB.db3"; 
     string documentsPath = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal); 
     var path = Path.Combine(documentsPath, sqliteFilename); 

     if (!File.Exists(path)) 
     { 
      using (var br = new BinaryReader(Android.App.Application.Context.Assets.Open("ATSDB.db3"))) 
      { 
       using (var bw = new BinaryWriter(new FileStream(path, FileMode.Create))) 
       { 
        byte[] buffer = new byte[2048]; 
        int length = 0; 
        while ((length = br.Read(buffer, 0, buffer.Length)) > 0) 
        { 
         bw.Write(buffer, 0, length); 
        } 
       } 
      } 
     } 



     // var plat = new SQLite.Net.Platform.XamarinAndroid.SQLitePlatformAndroid(); 
     var plat = new SQLite.Net.Platform.XamarinAndroid.SQLitePlatformAndroidN(); 

     var conn = new SQLite.Net.SQLiteConnection(plat, path); 
     // Return the database connection 
     return conn; 

    } 

**這行我得到錯誤** var conn = new SQLite.Net.SQLiteConnection(plat, path); // Return the database connection

我得到以下錯誤:

{System.DllNotFoundException: libsqlite3_xamarin  
    at (wrapper managed-to-native) SQLite.Net.Platform.XamarinAndroid.SQLiteApiAndroidNInternal:sqlite3_open_v2 (byte[],intptr&,int,intptr) 

    at SQLite.Net.Platform.XamarinAndroid.SQLiteApiAndroidN.Open (System.Byte[] filename, SQLite.Net.Interop.IDbHandle& db, System.Int32 flags, System.IntPtr zvfs) [0x00000] in <360d65bfaa3e44c0b2b5840d827a452d>:0 

    at SQLite.Net.SQLiteConnection..ctor (SQLite.Net.Interop.ISQLitePlatform sqlitePlatform, System.String databasePath, 
    SQLite.Net.Interop.SQLiteOpenFlags openFlags, System.Boolean storeDateTimeAsTicks, SQLite.Net.IBlobSerializer serializer, System.Collections.Generic.IDictionary`2[TKey,TValue] tableMappings, System.Collections.Generic.IDictionary`2[TKey,TValue] extraTypeMappings, 
    SQLite.Net.IContractResolver resolver) [0x000a2] in <8f2bb39aeff94a30a8628064be9c7efe>:0 

    at SQLite.Net.SQLiteConnection..ctor (SQLite.Net.Interop.ISQLitePlatform sqlitePlatform, System.String databasePath, System.Boolean storeDateTimeAsTicks, 
    SQLite.Net.IBlobSerializer serializer, System.Collections.Generic.IDictionary`2[TKey,TValue] tableMappings, System.Collections.Generic.IDictionary`2[TKey,TValue] 
    extraTypeMappings, SQLite.Net.IContractResolver resolver) [0x00000] 
    in <8f2bb39aeff94a30a8628064be9c7efe>:0 
    at ATSDriver.Droid.SqliteService.GetConnection() [0x000b5] 
    in E:\Projects\DriverApp\Source\ATSDriver\ATSDriver\ATSDriver.Android\SqliteService.cs:52 

at ATSDriver.DataAccess..ctor() [0x00009] in E:\Projects\DriverApp\Source\ATSDriver\ATSDriver\ATSDriver\DataAccess.cs:17 } 

希望有人們可以幫助我解決這個問題。提前致謝。

回答

0

這是一個錯誤,Sqlite.Net查看關於此here特別是this one的錯誤列表。 Android的限制對文件的訪問Android的7後,這影響了Sqlite.Net

總之包Sqlite.Net是死作爲所有者已經沒有更新過與Android合作7.參考:https://github.com/oysteinkrog/SQLite.Net-PCL/issues/370

我建議你改用Sqlite-Net其支持Android 7+

+0

感謝您的意見,是怎麼用這個,因爲我已經完成了這個應用程序的所有部分,並在最後我得到這樣的這個非常痛苦的錯誤 –

+0

@A任何例如鏈接,此.Goutam Theres沒有這樣做的指導。它只是刪除舊的'Sqlite.Net' nuget包,而是安裝'Sqlite-Net' nuget包。然後構建並修復任何錯誤。大部分錯誤只會改變名稱空間。這是一個痛苦,但'Sqlite.Net'的所有用戶都在那裏 – user1