MICROSOFT® ADO NET ENTITY FRAMEWORK STEP BY STEP

xx Microsoft ADO.NET 4 Step by StepDirectX 9 capable video card running at 1024 x 768 or higher-resolution displayDVD-ROM drive (if installing Visual Studio from DVD)Internet connection to download software or chapter examplesDepending on your Windows[r]

216 Microsoft ADO.NET 4 Step by StepAssociation set All association instances for a defined association type appear as a distinct collection called an association set. On the model side of the Framework, an association set contains the field definition[r]

// Although the rollback generated an error, the // transaction will still be rolled back by the // database because it did not get a commit order. MessageBox.Show("Error undoing the changes: " + ex2.Message); }}198 Microsoft ADO.NET 4 Step by StepVisual Bas[r]

206 Microsoft ADO.NET 4 Step by StepProcessing with a Distributed Transaction: C#Note This exercise uses the “Chapter 12 CSharp” sample project and continues from where the previous exercise in this chapter left off.1. Open the code for the AccountTransfe r class.[r]

itself becomes a serious issue.Consider two users, Alice and Bob, who are using the same event reservations system to pur-chase tickets for an upcoming concert. Because the seats for the concert are numbered, only a single user can purchase a numbered ticket for a specific seat. The sales system sell[r]

226 Microsoft ADO.NET 4 Step by StepNote The wizard’s capability to build a model from an existing database can be limited by se-curity rights and restrictions imposed on your database account. Make sure you have sufficient rights to the database tables and e[r]

Note If a storage layer property is used as a condition, it cannot be used as a standard mapped property within the conceptual model.Adding a Mapping Condition to an EntityNote This exercise continues the previous exercise in this chapter.1. If you haven’t yet displayed the Mapping Details panel, op[r]

156 Microsoft ADO.NET 4 Step by StepAs with nonparameterized queries, this enhanced statement gets wrapped up in a SqlCommand object:C#string sqlText = @"UPDATE Employee SET Salary = @NewSalary WHERE ID = @EmployeeID";SqlCommand salaryUpdate = new SqlCommand(sqlTex[r]

configured data source. Just after the “Test the connection” comment, add the follow-ing statements:testLink = New SqlConnection(connection.ConnectionString) testLink.Open()6. Run the program. Use the fields on the form to test your local configuration of SQL Server. For my test setup, I selected the L[r]

this command variation.Processing QueriesThe command object works for queries that return data values from the data source, and also for statements that take some action on the database but that return no stored data. These “nonquery” actions are typical when adding, updating, or removing records fr[r]

146 Microsoft ADO.NET 4 Step by StepAlong those same generic lines, the SqlDataReader object’s GetSchemaTable method returns a DataTable instance that describes the structure of the queried data. The new table’s content includes columns such as ColumnName, IsKey, a[r]

166 Microsoft ADO.NET 4 Step by Step4. Just after the “Read the next set, which contains the orders” comment, add the follow-ing code:customerReader.NextResult() Do While (customerReader.Read = True) oneOrder = New OrderInfo oneOrder.ID = CLng(customerRead[r]

"DELETE FROM UnitOfMeasure WHERE ID = @ID", linkToDB)With unitCommand.Parameters.Add("@ID", SqlDbType.BigInt, 0, "ID") .SourceVersion = DataRowVersion.OriginalEnd WithunitAdapter.DeleteCommand = unitCommand178 Microsoft ADO.NET 4 Step by StepThis code is more compl[r]

This exercise continues the previous exercise in this chapter.1. Open the source code view for the General class. Locate the GetConnectionString func-tion; this is a routine that uses a SqlConnectionStringBuilder to create a valid connection string to the sample database. It currently includes the f[r]

base for SQL processing. Instead, the original query must be converted into a regular .NET collection, as is done with the result .ToArray () clause. The original query is pro-cessed at that moment, and the results are placed in a standard anonymous array. The result2 query is actually doing[r]

326 Microsoft ADO.NET 4 Step by StepCalling Custom Database Functions: C#Note This exercise continues the previous exercise in this chapter.1. Open the source code view for the StatesByYear form. This form will access the AdmittedInYear database function. Your samp[r]

ect displays a single blank form.2. Add a data source for the table to be edited. The “Connecting to External Data” section in Chapter 1, “Introducing ADO.NET 4,” includes step-by-step instructions for creat-ing such a data source. Follow those instructions. When y[r]

function; this is a routine that uses a SqlConnectionStringBuilder to create a valid con-nection string to the sample database. It currently includes the following statements:sqlPortion.DataSource = @"(local)\SQLExpress"; sqlPortion.InitialCatalog = "StepSample"; sqlPortion.IntegratedSecurity = true[r]

356 Microsoft ADO.NET 4 Step by Step5. Run the program. When the form appears, it displays the first record from the CourseCatalog table. Chapter 21 Binding Data with ADO.NET 357Building the WPF project is simple using drag-and-drop techniques,[r]

366 Microsoft ADO.NET 4 Step by Step<! This is just the connection string portion of the Web.config file. > <connectionStrings> <add name="StepSampleConnectionString1" connectionString="Data Source=(local)\SQLExpress; In[r]