Many (update/insert/delete) DB operations now use transactions

Fixed: Improved series/episode info refresh speed

src/NzbDrone.Core/DataAugmentation/Xem/XemService.cs

@@ -1,6 +1,5 @@
 using System;
 using System.Linq;
-using System.Web.UI.WebControls;
 using NLog;
 using NzbDrone.Common.Cache;
 using NzbDrone.Core.Messaging.Events;

src/NzbDrone.Core/Datastore/BasicRepository.cs

@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Linq.Expressions;
+using System.Security.Cryptography.X509Certificates;
 using Marr.Data;
 using Marr.Data.QGen;
 using NzbDrone.Core.Datastore.Events;
@@ -142,23 +143,44 @@ namespace NzbDrone.Core.Datastore
 
         public void InsertMany(IList<TModel> models)
         {
+            using (var unitOfWork = new UnitOfWork(() => DataMapper))
+            {
+                unitOfWork.BeginTransaction();
+
                 foreach (var model in models)
                 {
-                Insert(model);
+                    unitOfWork.DB.Insert(model);
+                }
+
+                unitOfWork.Commit();
             }
         }
 
         public void UpdateMany(IList<TModel> models)
         {
+            using (var unitOfWork = new UnitOfWork(() => DataMapper))
+            {
+                unitOfWork.BeginTransaction();
+
                 foreach (var model in models)
                 {
-                Update(model);
+                    var localModel = model;
+
+                    if (model.Id == 0)
+                    {
+                        throw new InvalidOperationException("Can't update model with ID 0");
+                    }
+
+                    unitOfWork.DB.Update(model, c => c.Id == localModel.Id);
+                }
+
+                unitOfWork.Commit();
             }
         }
 
         public void DeleteMany(List<TModel> models)
         {
-            models.ForEach(Delete);
+            DeleteMany(models.Select(m => m.Id));
         }
 
         public TModel Upsert(TModel model)
@@ -179,7 +201,19 @@ namespace NzbDrone.Core.Datastore
 
         public void DeleteMany(IEnumerable<int> ids)
         {
-            ids.ToList().ForEach(Delete);
+            using (var unitOfWork = new UnitOfWork(() => DataMapper))
+            {
+                unitOfWork.BeginTransaction();
+
+                foreach (var id in ids)
+                {
+                    var localId = id;
+
+                    unitOfWork.DB.Delete<TModel>(c => c.Id == localId);
+                }
+
+                unitOfWork.Commit();
+            }
         }
 
         public void Purge()