ersatztv/ErsatzTV.Application/Libraries/Queries/CountMediaItemsByLibraryHandler.cs

using System.Data;
using System.Threading;
using System.Threading.Tasks;
using Dapper;
using MediatR;

namespace ErsatzTV.Application.Libraries.Queries
{
    public class CountMediaItemsByLibraryHandler : IRequestHandler<CountMediaItemsByLibrary, int>
    {
        private readonly IDbConnection _dbConnection;

        public CountMediaItemsByLibraryHandler(IDbConnection dbConnection)
        {
            _dbConnection = dbConnection;
        }

        public Task<int> Handle(CountMediaItemsByLibrary request, CancellationToken cancellationToken) =>
            _dbConnection.QuerySingleAsync<int>(
                @"SELECT COUNT(*) FROM MediaItem
                  INNER JOIN LibraryPath LP on MediaItem.LibraryPathId = LP.Id
                  WHERE LP.LibraryId = @LibraryId",
                new { request.LibraryId });
    }
}