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This chapter covers the following: Automation with MSBuild Deploying the website Deploying the database Automating configuration changes Automating database updates Custom configuration sections There is a right way and a wrong way to deploy your application releases A few years ago I worked with a developer who would create a backup of the production database, download it, restore it locally, and make changes to the database Then he would create a new backup, upload it, and restore it on the server There are clearly some problems with this process, the memory of which makes me smile and cringe at the same time I am glad that I have never had to follow this same process There are far better ways to push out updates with the tools available today.

interactions with data stores such as a database, and (b) decouple the rest of the software system from the specifics of the data stores For the purpose of our example, let s imagine that we are building the data access layer of a software system The data access layer will interact with our custom query provider We want the data access layer to abstract away the fact that we are using a LINQ query provider so that if we ever need to swap out the LINQ query provider and replace it with, say, an object-relational mapping component like NHibernate, the rest of the software system can stay the same To achieve the data-access abstraction we want, we can define the interface ICustomerDao shown in Listing 8-19.

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test: Evaluates an expression and returns success or failure if: Executes a set of command if a list of commands is successful and optionally executes a different set if it is not case: Matches a word with one or more patterns and executes the commands associated with the first matching pattern while: Repeatedly executes a set of commands while a list of commands executes successfully

Prior to working with SQL Server, many developers hooked up Microsoft Access databases to classic ASP applications by uploading a copy of the database file to the server where the website could directly access the file Because Microsoft Access was not typically installed on the server, a developer would take the application offline, pull down the database file, update it, and then put it back in place and bring the application back online This old process may explain why the developer in the previous example used a very similar process with a SQL Server database He was just doing what he was always doing, even though there is a better way While some of these old practices are becoming rare, I continue to see changes carried out manually from environment to environment If all that was changed was adding columns and.

The interface defines the signature of the FindByFirstName and FindByLastName methods and does not dictate what data store we should use in implementing the interface We might have a concrete implementation of the ICustomerDao interface that uses a database as the backing data store We might have another concrete implementation of the ICustomerDao interface that uses in-memory objects as the backing data store Because the rest of our software system works with the data-storeagnostic ICustomerDao interface, we can swap out one concrete implementation and swap in another and the rest of our software system won t be affected Listing 8-19 The ICustomerDao Interface public interface ICustomerDao { IEnumerable<Customer> FindByFirstName(string firstName); IEnumerable<Customer> FindByLastName(string lastName); } Listing 8-20 shows the CustomerDao class that implements the ICustomerDao interface by using a LINQ query provider internally.

albums.Add(album); } } } } catch (Exception ex) { HandleError("Exception with pap_GetAlbumsByUserName", ex); } // cache for 5 seconds HttpRuntime.Cache.Insert(cacheKey, albums, null, DateTime.Now.AddSeconds(5), TimeSpan.Zero); //return the results return albums; } /// <summary> /// SQL Implementation /// </summary> public override List<Photo> GetPhotosByAlbum(Album album) { List<Photo> photos = new List<Photo>(); try { using (DbCommand dbCmd = db.GetStoredProcCommand("pap_GetPhotosByAlbum")) { db.AddInParameter(dbCmd, "@AlbumID", DbType.Int64, album.ID); DataSet ds = db.ExecuteDataSet(dbCmd); // populate the photos collection if (ds.Tables.Count > 0) { foreach (DataRow row in ds.Tables[0].Rows) { Photo photo = new Photo(); photo.LoadDataRow(row); photo.Album = album; photos.Add(photo); } } } }

As you can see, the implementation of the FindByFirstName method uses the from, where, in, and select C# language syntactic sugar to construct and return an instance of IQueryable<Customer> as an instance of IEnumerable<Customer> This is okay because IQueryable<T> derives from the IEnumerable<T> interface The implementation of the FindByLastName method is similar to that of the FindByFirstName method Listing 8-20 The CustomerDao Class public class CustomerDao : ICustomerDao { private IQueryProvider provider; public CustomerDao(IQueryProvider provider) { thisprovider = provider; } public IEnumerable<Customer> FindByFirstName(string firstName) { return from c in providerCreateQuery<Customer>(null) where cFirstNameEquals(firstName) select c; } public IEnumerable<Customer> FindByLastName(string lastName) {.

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