070-516 : TS: Accessing Data with Microsoft .NET Framework 4

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Microsoft TS: Accessing Data with Microsoft .NET Framework 4 認定 070-516 試験問題:

1. You have an existing ContosoEntities context object named context.
Calling the SaveChanges() method on the context object generates an exception that has the following inner exception:
System.Data.SqlClient.SqlException: Cannot insert duplicate key row in object 'dbo.Colors' with unique index 'IX_Colors'.
You need to ensure that a call to SaveChanges() on the context object does not generate this exception. What should you do?

A) Add a try/catch statement around every call to the SaveChanges() method.
B) Examine the code to see how Color objects are allocated. Replace any instance of the new Color() method with a call to the ContosoEntities.LoadOrCreate() method.
C) Remove the unique constraint on the Name column in the Colors table.
D) Override the SaveChanges() method on the ContosoEntities class, call the ObjectStateManager.GetObjectStateEntries(System.Data.EntityState.Added) method, and call the AcceptChanges() method on each ObjectStateEntry object it returns

2. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application.
The application connects to a Microsoft SQL Server database. The application uses the ADO.NET Entity
Framework to model entities.
The database includes objects based on the exhibit (click the Exhibit button).
The application includes the following code segment. (Line numbers are included for reference only.)
01 using(AdventureWorksEntities context = new AdventureWorksEntities())
02 {
03 ...
04 foreach (SalesOrderHeader order in customer.SalesOrderHeader)
05 {
06 Console.WriteLine(String.Format("Order: {0} ",
order.SalesOrderNumber));
07 foreach (SalesOrderDetail item in order.SalesOrderDetail)
08 {
09 Console.WriteLine(String.Format("Quantity: {0} ", item.Quantity));
10 Console.WriteLine(String.Format("Product: {0} ",
item.Product.Name));
11 }
12 }
13 }
You want to list all the orders for a specific customer. You need to ensure that the list contains following fields:
-Order number
-Quantity of products
-Product name
Which code segment should you insert in line 03?

A) Contact customer = (from contact in context.Contact.Include
("SalesOrderHeader.SalesOrderDetail")
select contact).FirstOrDefault();
B) Contact customer = context.Contact.Where("it.ContactID = @customerId", new ObjectParameter("customerId", customerId)).First();
C) Contact customer = (from contact in context.Contact.Include
("SalesOrderHeader")
select contact).FirstOrDefault();
D) Contact customer = context.Contact.Where("it.ContactID = @customerId", new ObjectParameter("@customerId", customerId)).First();

3. You use Microsoft Visual Studio 2010 and .NET Framework 4.0 to create an application.
The application connects to a Microsoft SQL Server 2008 database. The application contains the following
code segment.
string SQL = string.Format("SELECT * FROM Customer WHERE CompanyName LIKE '%
{0}%', companyName);
var cmd = new SqlCommand(SQL, con);
You need to reduce the vulnerability to SQL injection attacks. Which code segment should you use?

A) string SQL = string.Format("SELECT * FROM " + " Customer Where CompanyName LIKE {0}",
new SqlCommand("@companyName", string.format("%{0}%", companyName))); var cmd = new SqlCommand(SQL, con);
B) string SQL = "SELECT" * FROM Customer @companyName; var cmd = new sqlcommand(SQL,con); cmd.Parameters.AddWithValue("companyName", string.format("where companyName LIKE '%{0}%'", companyName));
C) string SQL = "SELECT * FROM Customer Where " + "CompanyName LIKE @companyName"; var cmd = new SqlCommand(SQL,con); cmd.Parameters.AddWithValue("@companyName", string.Format("%{0}%", companyName));
D) string SQL = "SELECT * FROM Customer Where " + "CompanyName LIKE @companyName"; var cmd = new SqlCommand(SQL,con); var param = new SqlParameter ("@companyName", string.Format("%{0}%", companyName));

4. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application.
The application uses the ADO.NET Entity Framework to model entities.
The application allows users to make changes while disconnected from the data store.
Changes are submitted to the data store by using the SubmitChanges method of the DataContext object.
You receive an exception when you call the SubmitChanges method to submit entities that a user has
changed in offline mode.
You need to ensure that entities changed in offline mode can be successfully updated in the data store.
What should you do?

A) Set the ObjectTrackingEnabled property of DataContext to true.
B) Call the SaveChanges method of DataContext with a value of false.
C) Set the DeferredLoadingEnabled property of DataContext to true.
D) Call the SubmitChanges method of DataContext with a value of System.Data.Linq.ConflictMode.ContinueOnConflict.

5. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to develop an application.
You use the ADO.NET Entity Framework Designer to model entities. You retrieve an entity from an object context.
A different application updates the database. You need to update the entity instance to reflect updated
values in the database.
Which line of code should you use?

A) context.LoadProperty(entity, "Client", MergeOption.OverwriteChanges);
B) context.LoadProperty(entity, "Server", MergeOption.OverwriteChanges);
C) context.AcceptAllChanges();
D) context.Refresh(RefreshMode.StoreWins, entity);

質問と回答：