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Exercise 1: Connect Using ADO.NET In this exercise, you will connect to a local instance of SQL Server 2005 using ADO.NET. To do this, you will first create a simple Windows forms application using Visual Studio 2005. 1. Open Microsoft Visual Studio 2005. 2. On the File menu, select New, Project. 3. In the New Project dialog box, expand the Other Project Types node, and select Visual Studio Solutions. 4. Type TK4421 for the name of your blank solution, place it in a directory of your choosing, and then click OK. A new solution file will be created, and you can now add multiple projects to this solution. You will add one project for each lab included in this chapter. 5. On the File menu, select Add, New Project. Select Windows Application as the template, and type Lab1 as the project name. Set the language by selecting Visual Basic, Visual C#, or Visual J# from the language drop-down list box. By default, Visual Studio will select the language specified when it was first configured. 6. From the Toolbox, drag a button control onto the Form1 design surface. Use the following properties for this control: Name = btnOpen Text = Connect using ADO.NET 7. Right-click Form1 from Solution Explorer, and select View Code. At the top of the code file, add the following statement.

Transactions and concurrency Cache management (and concurrency)

As you can see, a full object/relational mapping tool needs to address quite a long list of issues. By now, you should be starting to see the value of ORM. In the next section, we look at some of the other benefits you gain when you use an ORM solution.

8. Paste the following code below the Form1_load method. Modify connection strings to match your environment.

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An ORM implementation is a complex beast less complex than an application server, but more complex than a web application framework like Struts or Tapestry. Why should we introduce another complex infrastructural element into our system Will it be worth it It will take us most of this book to provide a complete answer to those questions, but this section provides a quick summary of the most compelling benefits. First, though, let s quickly dispose of a nonbenefit.

//C# private void btnOpen_Click(object sender, EventArgs e) { try { //Open the Connection to SQL Server Express using ADO.NET string connString = @"server=(local);" + "Integrated Security=SSPI;" + "Database=AdventureWorks"; sqlConn = new SqlConnection(connString); sqlConn.Open();

A supposed advantage of ORM is that it shields developers from messy SQL This view holds that object-oriented developers can t be expected to understand SQL or relational databases well, and that they find SQL somehow offensive On the contrary, we believe that Java developers must have a sufficient level of familiarity with and appreciation of relational modeling and SQL in order to work with ORM ORM is an advanced technique to be used by developers who have already done it the hard way To use Hibernate effectively, you must be able to view and interpret the SQL statements it issues and understand the implications for performance Now, let s look at some of the benefits of ORM and Hibernate Productivity Persistence-related code can be perhaps the most tedious code in a Java application.

Hibernate eliminates much of the grunt work (more than you d expect) and lets you concentrate on the business problem No matter which application-development strategy you prefer top-down, starting with a domain model, or bottom-up, starting with an existing database schema Hibernate, used together with the appropriate tools, will significantly reduce development time Maintainability Fewer lines of code (LOC) make the system more understandable, because it emphasizes business logic rather than plumbing Most important, a system with less code is easier to refactor Automated object/relational persistence substantially reduces LOC Of course, counting lines of code is a debatable way of measuring application complexity However, there are other reasons that a Hibernate application is more maintainable In systems with hand-coded persistence, an inevitable tension exists between the relational representation and the object model implementing the domain.

Mandatory profiles can be helpful in situations in which you want to lock down the desktop. They are, in a practical sense, critical when you implement group profiles because you obviously don t want the changes one user makes to affect the environ ments of other users. To configure a profile as mandatory, simply rename a file in the root folder of the profile. Interestingly, mandatory profiles are not configured through the application of permissions. The file you need to rename is Ntuser.dat. It is a hidden file, so you must ensure that you have specified to Show hidden files and folders in the Folder Options program in Control Panel, or use attrib from the command-line to remove the Hidden attribute. You may also need to configure Windows Explorer to display file extensions. Locate the Ntuser.dat file in the profile you wish to make mandatory. Rename the file to Ntuser.man. The profile, whether roaming or local, is now mandatory.

MessageBox.Show("Connection was successful"); } catch (Exception ex) { MessageBox.Show(ex.Message); } } 'VB Private Sub btnOpen_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnOpen.Click Try 'Open the Connection to SQL Server using ADO.NET Dim connString As String = "server=(local);" & _ "Integrated Security=SSPI;" & _ "Database=AdventureWorks" Dim sqlConn As New SqlConnection sqlConn.ConnectionString = connString sqlConn.Open() MessageBox.Show("Connection was successful") Catch ex As Exception MessageBox.Show(ex.Message) End Try End Sub

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