'no such table: Blog' -error while table "Blog" does exist

Question

I followed the Getting Started on ASP.NET 5 guide about Entity Framework 7 and I replaced Microsoft SQL Server with SQLite, the only difference in the code is in Startup.cs:

services.AddEntityFramework()
    .AddSqlite()
    .AddDbContext<BloggingContext>(options => options.UseSqlite("Filename=db.db"));

When I run the website and navigate to /Blogs, I get an error:

Microsoft.Data.Sqlite.SqliteException was unhandled by user code ErrorCode=-2147467259 HResult=-2147467259 Message=SQLite Error 1: 'no such table: Blog' Source=Microsoft.Data.Sqlite SqliteErrorCode=1 StackTrace: at Microsoft.Data.Sqlite.Interop.MarshalEx.ThrowExceptionForRC(Int32 rc, Sqlite3Handle db) at Microsoft.Data.Sqlite.SqliteCommand.ExecuteReader(CommandBehavior behavior) at Microsoft.Data.Sqlite.SqliteCommand.ExecuteDbDataReader(CommandBehavior behavior) at System.Data.Common.DbCommand.ExecuteReader() at Microsoft.Data.Entity.Query.Internal.QueryingEnumerable.Enumerator.MoveNext() at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext() at System.Linq.Enumerable.d__1`2.MoveNext() at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext() at Microsoft.Data.Entity.Query.LinqOperatorProvider.ExceptionInterceptor`1.EnumeratorExceptionInterceptor.MoveNext() at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection) at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source) at EFGetStarted.AspNet5.Controllers.BlogsController.Index() in d:\arthur\documents\visual studio 2015\Projects\EFGetStarted.AspNet5\src\EFGetStarted.AspNet5\Controllers\BlogsController.cs:regel 18 InnerException:

I understand this as if there is no table called 'Blog', but when I open the .db file in DB Browser for SQLite, there actually is a table called 'Blog':

Does SQLite require other changes in the code, or is this an error in the SQLite connector for Entity Framework?

Answer 1

It is very likely the database actually being opened by EF is not the file you are opening in DB Browser. SQLite use the process current working directory, which if launched in IIS or other servers, can be a different folder than your source code directory. (See issues https://github.com/aspnet/Microsoft.Data.Sqlite/issues/132 and https://github.com/aspnet/Microsoft.Data.Sqlite/issues/55).

To ensure your db file is in the right place, use an absolute path. Example:

public class Startup
{
    private IApplicationEnvironment _appEnv;

    public Startup(IApplicationEnvironment appEnv)
    {
        _appEnv = appEnv;
    }
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddEntityFramework()
            .AddSqlite()
            .AddDbContext<MyContext>(
                options => { options.UseSqlite($"Data Source={_appEnv.ApplicationBasePath}/data.db"); });
    }
}