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BLOB parameter transaction
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Case Scenarios
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In the following case scenarios, you will apply what you ve learned about working with data in a connected environment. You can find answers to these questions in the Answers section at the end of this book.
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Case Scenario 1: Troubleshooting a Non-Performing Application
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You ve been contracted by The Phone Company to investigate why their Customer Relationship Management (CRM) application is running slow, causing support techs to spend an unreasonable amount of time waiting for queries to execute. After several days of analyzing their code base and backend database, you come to the conclusion that the lack of performance is due to the exponential increase of their customer base, which is causing too many records to be fetched when running queries that were not designed with scalability in mind. You also notice the archiving utility is constantly running, moving individual records from current to history. List the potential improvements you can make to the application.
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Case Scenario 2: Preventing the Inventory System from Selling Unavailable Products
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Your biggest customer, Wide World Importers, is now selling items from many new manufacturers around the globe. Their system is set up to forward orders to the cor rect manufacturers if local warehouses are out of stock so items can be drop-shipped to the proper customers. The main problem this poses is that they seem to be forward ing orders for items that are not in stock or have longer than acceptable lead times, and it s causing customers to become extremely upset. Given that each manufacturer exposes its inventory information and projected man ufacture date for new inventory, what modifications can you make to the Wide World Importers sales application to remedy this problem
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Suggested Practices
To gain further knowledge on the subject of working with data in a connected envi ronment, complete the following practices:
Practice 1
Create an application that saves data to the Northwind Employees table and allows you to select a picture from your hard drive to save in the Photo column. Create an application that queries the Northwind Customers table and has separate commands to return data based on CompanyName, City, or PostalCode. Create an application that bulk copies all Northwind Orders, which have already shipped, into a ShippedOrders table.
Practice 2
Practice 3
Take a Practice Test
The practice tests on this book s companion CD offer many options. For example, you can test yourself on just the content covered in this chapter, or you can test yourself on all the 70-526 certification exam content. You can set up the test so that it closely sim ulates the experience of taking a certification exam, or you can set it up in study mode so that you can look at the correct answers and explanations after you answer each question.
MORE INFO
Practice tests
For details about all the practice test options available, see the How to Use the Practice Tests sec tion in this book s Introduction.
7
Create, Add, Delete, and Edit Data in a Disconnected Environment
This chapter describes how to work with data loaded from a database or XML docu ment into your application. ADO.NET provides several objects, such as DataSet and DataTable objects, for caching data in applications so that you can disconnect from the database and work with the data in your application and then reconnect when you are ready to save your updates back to the data source.
Exam objectives in this chapter:
Create, add, delete, and edit data in a disconnected environment.
Create a DataSet graphically. Create a DataSet programmatically. Add a DataTable to a DataSet. Add a relationship between tables within a DataSet. Navigate a relationship between tables. Merge DataSet contents. Copy DataSet contents. Create a typed DataSet. Create DataTables. Manage data within a DataTable. Create and use DataViews. Represent data in a DataSet by using XML. Use the OleDbDataAdapter object to access an ADO Recordset or Record. Generate DataAdapter commands automatically by using the CommandBuilder object.
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