EF Core temporary table operations

Internet to find the two, a memory table, a temporary table.

1 installation package: EntityFrameworkCore.MemoryJoin // memory table directly select union stitching inquiry  http://tsherlock.tech/2018/03/20/joining-in-memory Entity-to---list-Query Framework /
the DbContext added class:  protected DbSet <QueryModelClass> {QueryData is GET; SET;} // remove upsized note the code table upsized code

2 references:  https://dev.azure .com / pawelgerr / _git / Thinktecture.EntityFrameworkCore  ; or:  https://github.com/yangzhinong/Thinktecture.EntityFrameworkCore  DLL compiled

ConfigureServices method added: 

          services.AddDbContext<SalesDbContext>(options => {

                options.UseSqlServer(_appConfiguration.GetConnectionString("Default"), opts => {

                    opts.AddTempTableSupport();

                });

            });

3. Define the interface and implementation of common Repository

3.1 public interface ITempTableRepository {

        IQueryable<T> FromLocalList<T>(IList<T> data) where T : class;

        Task<IQueryable<T>> BulkInsertIntoTempTableAsync<T>(IEnumerable<T> entities) where T : class;

 }
3.2 public class TempTableRepository : SalesRepositoryBase<CodeTemplate<Guid>, Guid>, ITempTableRepository {

        public TempTableRepository(IDbContextProvider<SalesDbContext> dbContextProvider) : base(dbContextProvider) {

        }

        public async Task<IQueryable<T>> BulkInsertIntoTempTableAsync<T>(IEnumerable<T> entities) where T : class {

            var query = await Context.BulkInsertIntoTempTableAsync(entities, new SqlTempTableBulkInsertOptions() {

                PrimaryKeyCreation = PrimaryKeyCreation.None,

            });

            return query;

        }

        public IQueryable<T> FromLocalList<T>(IList<T> data) where T : class {

            return Context.FromLocalList(data);

        }

    }
3.3 defined in the DbContext
     public  dbquery <ImpTestTemp> {GET ImpTestTemps; SET;} 

==========================
4 can use class injection ITempTableRepository

        private readonly IObjectMapper _objectMapper;

        private readonly IRepository<Area, Guid> _area;

         private readonly ITempTableRepository _tempTableRepository;

        public AreaService(IRepository<Area, Guid> area, IObjectMapper objectMapper,

            ITempTableRepository tempTableRepository) {

            _area = area;

            _objectMapper = object mapper;

             _tempTableRepository = tempTableRepository;

        }
 

        public async Task<IEnumerable<GetAreaByParentIdOutput>> GetAreaByParentIdAsync(Guid? parentId) {

            var lst = new List<ImpTestTemp> {

                new ImpTestTemp { Id = 1, AreaId=new Guid("179A9943-EC6C-4923-8B75-00818198008E") ,Code = "123", Name = "yzn", Sorce=98.5m },

                new ImpTestTemp { Id = 2, AreaId= new Guid("48E8124C-789B-4158-BE9C-00507403DF7E"), Code = "456", Name = "seq" , Sorce=99.4m}

            };

             var queryList = await _tempTableRepository.BulkInsertIntoTempTableAsync (lst) ; // can use this data multiplexing method
            var queryList2 = _tempTableRepository.FromLocalList (lst); // This method is less data available 

            var efQuery = (from t in queryList

                           join a in _area.GetAll()

                           on t.AreaId equals a.Id

                           select new {

                               t.Code,

                               AreaCode = a.Code,

                               a.Name

                           }).ToList();

         retun null;          

        }

    }