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catch (Exception ex) { HandleError("Exception with pap_GetPhotosByAlbum", ex); } //return the results return photos; } /// <summary> /// SQL Implementation /// </summary> public override Album AlbumInsert( string userName, string albumName, bool active, bool shared) { try { using (DbCommand dbCmd = db.GetStoredProcCommand("pap_InsertAlbum")) { db.AddInParameter(dbCmd, "@UserName", DbType.String, userName); db.AddInParameter(dbCmd, "@Name", DbType.String, albumName); db.AddInParameter(dbCmd, "@IsActive", DbType.Boolean, active); db.AddInParameter(dbCmd, "@IsShared", DbType.Boolean, shared); db.AddOutParameter(dbCmd, "@AlbumID", DbType.Int64, 0); db.ExecuteNonQuery(dbCmd); long albumId = (long)db.GetParameterValue(dbCmd, "@AlbumID"); ClearAlbumCache(userName); List<Album> albums = GetAlbums(userName); foreach (Album album in albums) { if (album.ID == albumId) { return album; } } } } catch (Exception ex) { HandleError("Exception with pap_InsertAlbum", ex); }

return from c in provider.CreateQuery<Customer>(null) where c.LastName.Equals(lastName) select c; } } The code in the CustomerDao class does not run by itself. Listing 8-21 shows an example that creates an instance of CustomerDao and calls the FindByFirstName and FindByLastName methods on the instance. The example is pretty self-explanatory. One thing to note is that when FindByFirstName or FindByLastName returns an IQueryable<Customer> type cast as an IEnumerable<Customer> instance, the LINQ query represented by the IEnumerable<Customer> instance is not executed yet. The LINQ query is executed when the code in Listing 8-21 starts iterating through the IEnumerable<Customer> instance. This is because when that happens, the GetEnumerator method of the Query class will be called. If you look at the code in the GetEnumerator method of the Query class, you will see that there the LINQ query is executed by a query provider. Listing 8-21. An Example of Using the CustomerDao Class private static void RunCustomerDaoExample() { CustomerDao customerDao = new CustomerDao(DataStore.GetCustomerQueryProvider()); IEnumerable<Customer> customers = customerDao.FindByFirstName("Bob"); foreach (var item in customers) Console.WriteLine(item); customers = customerDao.FindByLastName("Jones"); foreach (var item in customers) Console.WriteLine(item); } Even though the ICustomerDao interface and the CustomerDao class provide a nice abstraction of the underlying data access details to the rest of our software system, one downside of this approach is the amount of boilerplate code we need to write. For each property, such as FirstName in the Customer class, we need to define a method like FindByFirstName method in ICustomerDao and implement that method in CustomerDao. It would be nice if we could freely define properties like FirstName and LastName in Customer and the rest of the data access code, such as the FindByFirstName and FindByLastName methods, would just be there automatically. Well, that s what our next approach is going to do.

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throw new ApplicationException("New album not found"); } /// <summary> /// SQL Implementation /// </summary> public override Photo PhotoInsert(Album album, string photoName, DateTime photoDate,String regularUrl, int regularWidth, int regularHeight, String thumbnailUrl, int thumbnailWidth, int thumbnailHeight, bool active, bool shared) { try { using (DbCommand dbCmd = db.GetStoredProcCommand("pap_InsertPhoto")) { if (photoName.Length > 40) { photoName = photoName.Substring(0, 40); } db.AddInParameter(dbCmd, "@AlbumID", DbType.Int64, album.ID); db.AddInParameter(dbCmd, "@Name", DbType.String, photoName); db.AddInParameter(dbCmd, "@PhotoDate", DbType.DateTime, photoDate); db.AddInParameter(dbCmd, "@RegularUrl", DbType.String, regularUrl); db.AddInParameter(dbCmd, "@RegularWidth", DbType.Int32, regularWidth); db.AddInParameter(dbCmd, "@RegularHeight", DbType.Int32, regularHeight); db.AddInParameter(dbCmd, "@ThumbnailUrl", DbType.String, thumbnailUrl); db.AddInParameter(dbCmd, "@ThumbnailWidth", DbType.Int32, thumbnailWidth); db.AddInParameter(dbCmd, "@ThumbnailHeight", DbType.Int32, thumbnailHeight); db.AddInParameter(dbCmd, "@IsActive", DbType.Boolean, active); db.AddInParameter(dbCmd, "@IsShared", DbType.Boolean, shared); db.AddOutParameter(dbCmd, "@PhotoID", DbType.Int64, 0); db.ExecuteNonQuery(dbCmd); long photoId = (long)db.GetParameterValue(dbCmd, "@PhotoID");

Listing 11-21. HelloConsole.htm <html> <head> <script type="text/javascript"> window.DLR = {} DLR.path = "/hellodlr" DLR.settings = {console: true} </script> <script src="/hellodlr/dlr.js" type="text/javascript"></script> </head> <body> <script type="text/Hello"> dummy code </script> </body> </html>

List<Photo> photos = GetPhotosByAlbum(album); foreach (Photo photo in photos) { if (photo.ID == photoId) { return photo; } } } } catch (Exception ex) { HandleError("Exception with pap_InsertPhoto", ex); } throw new ApplicationException("New photo not found"); } /// <summary> /// SQL Implementation /// </summary> public override void AlbumUpdate(Album album) { try { using (DbCommand dbCmd = db.GetStoredProcCommand("pap_UpdateAlbum")) { db.AddInParameter(dbCmd, "@AlbumID", DbType.Int64, album.ID); db.AddInParameter(dbCmd, "@Name", DbType.String, album.Name); db.AddInParameter(dbCmd, "@IsActive", DbType.String, album.IsActive); db.AddInParameter(dbCmd, "@IsShared", DbType.String, album.IsShared); db.ExecuteNonQuery(dbCmd); } } catch (Exception ex) { HandleError("Exception with pap_UpdateAlbum", ex); } } /// <summary>

Summary

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/// SQL Implementation /// </summary> public override void PhotoUpdate(Photo photo) { try { using (DbCommand dbCmd = db.GetStoredProcCommand("pap_UpdatePhoto")) { db.AddInParameter(dbCmd, "@PhotoID", DbType.Int64, photo.ID); db.AddInParameter(dbCmd, "@Name", DbType.String,photo.Name); db.AddInParameter(dbCmd, "@PhotoDate", DbType.DateTime, photo.PhotoDate); db.AddInParameter(dbCmd, "@RegularUrl", DbType.String, photo.RegularUrl); db.AddInParameter(dbCmd, "@RegularWidth", DbType.Int32, photo.RegularWidth); db.AddInParameter(dbCmd, "@RegularHeight", DbType.Int32, photo.RegularHeight); db.AddInParameter(dbCmd, "@ThumbnailUrl", DbType.String, photo.ThumbnailUrl); db.AddInParameter(dbCmd, "@ThumbnailWidth", DbType.Int32, photo.ThumbnailWidth); db.AddInParameter(dbCmd, "@ThumbnailHeight", DbType.Int32, photo.ThumbnailHeight); db.AddInParameter(dbCmd, "@IsActive", DbType.Boolean, photo.IsActive); db.AddInParameter(dbCmd, "@IsShared", DbType.Boolean, photo.IsShared); db.ExecuteNonQuery(dbCmd); ClearAlbumCache(photo.Album.UserName); } } catch (Exception ex) { HandleError("Exception with pap_UpdatePhoto", ex); } } /// <summary> /// SQL Implementation /// </summary> /// <param name="album"></param> public override void AlbumDeletePermanent(Album album)

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