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SQL Server provides concurrency protection SQL Server CE does not provide concurrency protection More things can go wrong in SQL Server The need for a remote connection, the granularity of user access security, and the server-side data integrity capabilities all increase the possibility that your application s request can fail and an exception will be raised (This is a client-side judgment From SQL Server s point of view, access security and data integrity constraints don t cause things to go wrong, they prevent things from going wrong) Despitethemajordifferencesbetweenthetwoproducts,accessingeach from your application is remarkably similar We hope this emerges from the upcoming discussion of the subject We begin with connecting to the database We use the same sample applications we used when discussing SQL Server CE programming in the previous section of this chapter; we merely change them to access SQL Server s Northwind database, the sample database that is created whenever SQL Server is installed Once we have set an assembly reference to the SystemDataSqlClientdll module and optionally added the matching using statement shown here, we are ready to create a connection object and open a connection to a SQL Server database:
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using SystemDataSqlClient;
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641 Connecting to SQL Server We use essentially the same connection class to connect to a SQL Server database as we used to connect to a SQL Server CE database, although the connection classes reside in different namespaces and have slightly different names (In SQL Server CE, we connect using the SqlCeConnection4 class, whereas with SQL Server we use the SqlConnection5 class) But both classes adhere to the same Microsoft specification for provider-specific classes, so the PMEs are the same The code shown in Listing 611 is the code for the DataReader application that we originally wrote for SQL Server CE and have now modified
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4 Fully qualified name: SystemDataSqlServerCeSqlCeConnection 5 Fully qualified name: SystemDataSqlClientSqlConnection
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Figure 615: The DataReader Program (Repeated)
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for SQL Server We introduced the DataReader application in Figure 612 and Listing 66 earlier in this chapter For convenience, in Figure 615 we again show the main screen of the DataReader program As shown in Listing 611, we modified the original code to access SQL Server We did so by changing the statement in which the connection string is defined, by changing SqlCe to Sql, and by setting a reference to the SQL Server client namespace rather than to the SQL Server CE client namespace Because the Seek method is not supported by the SqlDataReader class, we use the version of the LoadOneProduct method that we showed earlier in Listing 67
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Listing 611: Using a DataReader Object with SQL Server
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using using using using System; SystemWindowsForms; SystemData; SystemDataSqlClient;
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namespace DataReader { /// <summary> /// Summary description for FormMain /// </summary> public class FormMain : SystemWindowsFormsForm { #region Assorted Generated Code
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#region Windows Form Designer generated code
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// Connection string private string strConn = "data source=OurServer;" + "initial catalog=Northwind;" + "user id=DeliveryDriver;" + "pwd=DD;" + "workstation id=OurDevice;" + "packet size=4096;" + "persist security info=False;"; // Select product keys private string strGetProductIDs = " SELECT ProductID FROM Products "; // Select one product, joined with its category private string strGetOneProduct = " SELECT ProductID, ProductName, CategoryName " + " FROM Products P " + " JOIN Categories C on CCategoryID = PCategoryID " + " WHERE PProductID = "; // Used to bypass the SelectIndexChanged event // during the loading of the ComboBox private bool boolLoading = true;
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private void FormMain_Load(object sender, EventArgs e) { // Display a close box thisMinimizeBox = false; // Let the form present itself ApplicationDoEvents(); // Load product keys into the ComboBox // and select the first one LoadProductIDs(); comboKeysSelectedIndex = 0; }
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private void comboKeys_SelectedIndexChanged(object sender, EventArgs e) { // A product key has been selected; retrieve // and display the corresponding product
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