在 xamarin 表单 pcl 上执行查询时没有这样的表 sqlite [英] No such table sqlite when execute query on xamarin forms pcl

问题描述

我在读取 SQLite 数据库中的表时遇到问题.

I have a problem with the reading of the tables on the SQLite database.

我的 OBJ_User 类:

my OBJ_User class:

    namespace Fimap.Models
{
    public class OBJ_User
    {
        public int DLR_Id { get; set; }
        public string DLR_Username { get; set; }
        public string DLR_Password_Hash { get; set; }
        public object DLR_Nome { get; set; }
        public string DLR_Cognome { get; set; }
        public int DLR_Tipo { get; set; }
        public string DLR_Azienda { get; set; }
        public object DLR_Telefono { get; set; }
        public object DLR_Email { get; set; }
        public int DLR_Abilitato { get; set; }
        public object DLR_Time_Zone { get; set; }
        public object DLR_Country { get; set; }
        public string DLR_Culture { get; set; }
        public object DLR_Email1 { get; set; }
        public object DLR_MCC_Modello_Alias { get; set; }
        public object DLR_Anagrafica { get; set; }
        public object DLR_Firma { get; set; }
        public bool IsFIMAP { get; set; }
        public bool IsSTANDARD { get; set; }
        public bool IsDealerOrFimap { get; set; } //true dealer - false user
        public object DLR_Tipo_Esteso { get; set; }
        public object DLR_Abilitato_Esteso { get; set; }
    }
}

我在 pcl 项目中的界面:

my interface in pcl project:

public interface IDatabaseConnection
    {
        SQLite.SQLiteConnection DbConnection();
    }

安卓

[assembly: Xamarin.Forms.Dependency(typeof(DatabaseConnection_Android))]
namespace Fimap.Droid
{
    public class DatabaseConnection_Android : IDatabaseConnection
    {
        public SQLiteConnection DbConnection()
        {
            var dbName = "FimapDB.db3";
            var path = Path.Combine(System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal), dbName);
            return new SQLiteConnection(path);
        }
    }
}

iOS

[assembly: Xamarin.Forms.Dependency(typeof(DatabaseConnection_iOS))]
namespace App.iOS
{
    public class DatabaseConnection_iOS : IDatabaseConnection
    {
        public SQLiteConnection DbConnection()
        {
            var dbName = "FimapDB.db3";
            string personalFolder = System.Environment.GetFolderPath(Environment.SpecialFolder.Personal);
            string libraryFolder = Path.Combine(personalFolder);
            var path = Path.Combine(libraryFolder, dbName);
            return new SQLiteConnection(path);
        }
    }
}

pcl 连接(数据库正确连接):

pcl connection (database is right connect):

database = DependencyService.Get<IDatabaseConnection>().DbConnection();

查询:

var test = database.Query<OBJ_User>("SELECT * FROM OBJ_User");

当我启动查询时出现此错误:

when i launch the query i have this error:

SQLite.SQLiteException: 没有这样的表:OBJ_User

SQLite.SQLiteException: no such table: OBJ_User

OBJ_User 在数据库中，只有一条记录.为什么连接不映射表?数据库变量正确连接到数据库sqlite，我不明白，因为数据库没有从sqlite文件中获取映射.解决方案?

OBJ_User is in the dabatase with one record. Why the connection don't mapping the table ? database variable is right connect to database sqlite, i don't understand because database don't get mapping from sqlite file. Solution ?

如果你想要其他信息在评论中写我，我会回答

if you want other info write me in the comment, i will answer

推荐答案

SQLite 库不知道如何将类型 object 的属性映射到 sqlite 列.SQLite 库默认支持以下列类型:string、int、double、byte[]、DateTime.

The SQLite library doesn't know how to map the properties of type object to a sqlite column. The SQLite library supports the following column types by default: string, int, double, byte[], DateTime.

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