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Model your requirements using EA, and then organize them into packages. With the Mapplet 2.0 domain model in place, it wasn t long before a comprehensive set of requirements was being captured. These were all modeled in EA (see Figures 8 2 through 8 6), inside these packages: Functional Requirements |__ User Interface |__ Hotel Filter |__ Map Non-Functional Requirements The team also created a package called Optional Requirements (a euphemism for Perhaps in the next release ), which we haven t shown here. You ll often hear people talking about functional and non-functional requirements, but what exactly makes a requirement one or the other To answer this question, it helps to think about the criteria often known as the ilities : capability, maintainability, usability, reusability, reliability, and extendability.3 Functional requirements represent the capabilities of the system; non-functional requirements represent all the other ilities that we just listed.

1. 2.

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You can also move connection information into configuration files and referenced by name instead of being embedded directly in the markup, using the same techniques you learned in 10 on connection string management. This entry would be in the web.config. <connectionStrings> <add name="pubsConn" connectionString="database=pubs;server=.;uid=sa;pwd=123123" /> </connectionStrings> And then you can use the <%$ ConnectionStrings:ConnectionName %> syntax from your markup. <asp:SqlDataSource Runat=server ID=sdsAuthors ConnectionString= '<%$ ConnectionStrings:pubsConn %>' SelectCommand="select * from authors" /> <asp:GridView Runat=server ID=dvAuthors DataSourceID=sdsAuthors /> In these demos, you ve seen pages that can display, query, modify, delete, and create your data. Doing so required no code. We re not going to bother showing you the Wizards and Designers that generate this markup (as there s about 100,000 screen shots of this on MSDN and the Web in general), but using these tools can eliminate the need to even learn the syntax and nuances of this markup. Creating pages like this is extremely quick and easy to do. This is powerful stuff. To reiterate, this control is great for a number of things. Evangelizing, and doing demos on, how easy Visual Studio is to use Prototyping/proof of concept/Requests for Proposals (RFPs) Internal tools or small solutions with simple requirements Any time doing something quickly is more important than any other architectural requirement

Add a column of type TimeStamp to the table mapped to the Product entity. Right-click the design surface and select Update Model from Database. Update the model with the newly changed table. The updated model is shown in Figure 14-2. Right-click the TimeStamp property and select Properties. Change its Concurrency Mode property to Fixed.

Tip There s a huge benefit to storing requirements in a modeling tool rather than a Word document, which is that the requirements model comes to life (in a manner of speaking). You can link use cases and design elements back to individual requirements; you can create test cases for each requirement, too.

Figure 14-2. The updated model with the newly added TimeStamp property The code in Listing 14-1 demonstrates that changing the underlying row in the table between the time the product entity is materialized and the time we update the table from changes in the product entity throws an exception. Listing 14-1. Throwing an exception if optimistic concurrency is violated using (var context = new EFRecipesEntities()) { context.Products.AddObject(new Product { Name = "High Country Backpacking Tent", UnitPrice = 199.95M }); context.SaveChanges(); } using (var context = new EFRecipesEntities()) { // get the product var product = context.Products.SingleOrDefault(); Console.WriteLine("{0} Unit Price: {1}", product.Name, product.UnitPrice.ToString("C")); // update out of band context.ExecuteStoreCommand(@"update chapter14.product set unitprice = 229.95 where productId = @p0", product.ProductId); // update the product the via the model product.UnitPrice = 239.95M; Console.WriteLine("Changing {0}'s Unit Price to: {1}", product.Name, product.UnitPrice.ToString("C")); try {

It is not, however, suited as a general purpose approach to providing a data access layer for a distributed application of any significant size, scale, or complexity. Embedding structured query language in the presentation tier is not maintainable for larger applications. Typically you want to see data access encapsulated within its own layer of the application, probably only exposed by a business object layer that sits between the presentation and data layers. Ideally, it s best to create a layer of abstraction between UI developers and relational databases. This lets developers focus on meeting functional requirements, and relegates database modeling and schema to the information architects and DBAs, where it belongs. When these architectural requirements are present, the ObjectDataSource provides a much better solution.

See Peter de Grace s insightful book The Olduvai Imperative: CASE and the State of Software Engineering Practice (Yourdon Press, 1993). It s unfortunately out of print, but the chapter An Odyssey Through the Ilities by itself makes the book well worth hunting down.

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