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Developing Windows Azure and Web Services

Question No: 31 – (Topic 2)

The GetVendors() action in the ProcessedOrderController controller is querying the database each time it is run. The GetVendors() action must query the database only if the cache is null.

You need to add code to the action at line PC33 to cache the data.

Which code segment can you use? (Each correct answer presents a complete solution. Choose all that apply.)

  1. cache.Set(new CacheItem(quot;vendorKeyquot;, vendors), GetVendorPolicy());

  2. cache.Add(quot;vendorsquot;, vendors, new CacheItemPolicy());

  3. cache.Add(new CacheItem(quot;vendorKeyquot;, vendors) , GetVendorPolicy());

  4. cache.AddOrGetExisting(quot;vendorKeyquot;, context, new CacheItemPolicy());

Answer: A,C

Question No: 32 DRAG DROP – (Topic 2)

The UploadOrder() method in the UploadCallbackService service is not implementing the callback behavior defined in the IUploadCallBackService interface.

You need to modify the class to implement the required callback behavior.

What should you do? (To answer, drag the appropriate code segments to the correct location or locations in the answer area. Each code segments may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.)

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Answer:

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Topic 3, Online Bookstore Background

You are developing an online bookstore web application that will be used by your company#39;s customers.

Technical Requirements General requirements:

->The web store application must be an ASP.NET MVC application written in Visual

Studio.

->The application must connect to a Microsoft SQL database.

->The GetTop100Books() method is mission critical and must return data as quickly as possible. It should take advantage of fast, forward-only, read-only methods of reading data.

->The ImportBooks() method must keep a copy of the data that can be accessed while new books are being imported without blocking reads.

->The Create MonthlyTotalsReport() method must lock the data and prevent others from updating or inserting new rows until complete.

->The college textbook area of the web application must get data from a daily updated CSV file.

->The children#39;s book area of the web application must get data directly from a local database. It must use a connection string. It must also support access to the stored procedures on the database. Further, it is required to have strongly typed objects. Finally, it will require access to databases from multiple vendors and needs to support more than one-to-one mapping of database tables.

->The cookbook functionality is contained within a client-side application that must connect to the server using HTTP and requires access to the data using JavaScript.

->The BookApiController class must have a method that is able to perform ad-hoc queries using OData.

The RESTful API of the bookstore must expose the following endpoints.

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Application Structure

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PurchaseOrders.xml

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FeaturedBooks.xml

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Question No: 33 – (Topic 3)

You need to return the list of the top 100 books for the GetTopBooks() method. Which type should you use to retrieve the data?

  1. SqlDataReader

  2. DataSet

  3. DataTable

  4. Data View

Answer: A

Question No: 34 – (Topic 3)

You need to create an OData filter expression that returns books that match the following characteristics:

->Published after 1/1/2000

->Have quot;Sciencequot; as the first word

Which filter statement should you use?

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  1. Option A

  2. Option B

  3. Option C

  4. Option D

Answer: D Explanation: * gt Greater than Example:

filter= Entry_No gt 610

Query on GLEntry service. Returns entry numbers 611 and higher.

  • startswith filter=startswith(Name, #39;S#39;)

    Query on Customer service. Returns all customers names beginning with “S”.

    Question No: 35 – (Topic 3)

    The PurchaseOrders.xml file contains all of the purchase orders for the day. You need to query the XML file for all of the shipping addresses.

    Which code segment should you use?

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    1. Option A

    2. Option B

    3. Option C

    4. Option D

    Answer: B

    Question No: 36 DRAG DROP – (Topic 3)

    An XML file must be produced by the SaveFeaturedBooks() method of the Book class. The schema of the resulting XML file must be identical to the FeaturedBooks.xml file.

    You need to write the code to produce the file. You have the following code:

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    Which code segments should you include in Target 1, Target 2 and Target 3 to complete the code? (To answer, drag the appropriate code segments to the correct targets in the answer area. Each code segment may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content)

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    Answer:

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    Question No: 37 – (Topic 3)

    You need to update the ImportBooks() method to use database transactions. Which code segment should you use?

    1. SqlConnection.BeginTransaction(IsolationLevel.RepeatableRead);

    2. SqlConnection.BeginTransaction(IsolationLeve.ReadUnconvnited);

    3. SqlConneetion.BeginTransaction(IsolationLevel.Serializable);

    4. SqlConnection.BeginTransaction(IsolationLevel.Snapshot);

    Answer: B

    Explanation: * scenario: The ImportBooks() method must keep a copy of the data that can be accessed while new books are being imported without blocking reads.

  • ReadUncommitted

    A dirty read is possible, meaning that no shared locks are issued and no exclusive locks are honored.

    Question No: 38 – (Topic 3)

    You need to configure the server to self-host the bookstore#39;s Web API application. Which code segment should you use?

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    1. Option A

    2. Option B

    3. Option C

    4. Option D

    Answer: C

    Explanation: MapHttpRoute Method Maps the specified route template.

    Use the option with quot;api/…

    Question No: 39 – (Topic 3)

    You need to choose the appropriate data access strategy for the college textbook area of the web application.

    Which data access technology should you implement?

    1. ADO.NET

    2. Entity Data Model (EDM)

    3. WCF Data Services

    4. LINQ to SQL

    Answer: A

    Explanation: * Scenario: The college textbook area of the web application must get data from a daily updated CSV file.

  • ADO.NET reads the CSV file in a very similar way as table in database.

    Question No: 40 – (Topic 3)

    You need to implement the Get() method in the bookstore Web API application to be able to find books by using an ad hoc query.

    Which method should you use?

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    1. Option A

    2. Option B

    3. Option C

    4. Option D

    Answer: D

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