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Case Scenario: Selecting a Data Access Strategy
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You are a database developer for a large bank that is currently upgrading several classic ASP applications to the .NET Framework. The new applications will access a SQL Server that was recently upgraded from SQL Server 2000 to SQL Server 2005. This is the only data source that the application needs to access. The original applications used Visual Basic script to access business logic stored in DLLs built with Visual Basic 6.0. The development manager has asked you to review the first application to be upgraded and make recommendations for what technologies the new application will utilize. The application is a Web application used by customers to access account information. He tells you that the first upgrade will be a test run for the remaining upgrades, and he would like to see it done as quickly as possible. What recommendations do you make to the manager regarding data access
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Designing a Data Access Strategy
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Objective 1.1: Design appropriate data access technologies
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Practice 1 Locate non-SQL data sources in your organization, such as Access databases or Excel spreadsheets. Create a test .NET Windows application that makes a connection to these data sources using the MDAC data providers discussed in Lesson 1. Use the ODBC and ADO APIs to create the connection. Pay attention to differences in the connection strings for each provider. Practice 2 Create an HTTP endpoint that references the stored procedure created in Lab 1 for Lesson 2. This time, alter the values for the CREATE ENDPOINT statement so that it returns data as T-SQL instead. Also, make a change so that batches are not enabled. Note the differences in the output that is generated.
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Objective 1.2: Design an appropriate data access object model
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Practice 1 Create a test Windows .NET application that reads data from a non-SQL data source using the ODBCDataReader object. The application should iterate through the data and display the results in a DataGridView control. Practice 2 Create a test Windows .NET application that will access the AdventureWorks database and execute the following query:
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The application should use an XMLDataReader object to return the data as an XML stream. Display the data on the Windows form using either a listbox control, textbox control, or message box.
References
Learning ADO.NET http://msdn2.microsoft.com/en-us/data/aa937699.aspx Learning Microsoft Data Access Components (MDAC) http://msdn2.microsoft.com/en-us/data/aa937703.aspx Learning SQL Native Client http://msdn2.microsoft.com/en-us/data/aa937705.aspx Usage Scenarios for SQL Server 2005 Native Web Services http://msdn2.microsoft.com/en-us/library/ms345140.aspx
Lesson 3: Designing a Data Access Object Model
How to Use the ODBC.NET Managed Provider in Visual Basic .NET and Connection Strings http://support.microsoft.com/kb/310985/ How to Use the ODBC.NET Managed Provider in Visual C# .NET and Connection Strings http://support.microsoft.com/kb/310988 SQL Server OLE DB Programmers Reference http://msdn2.microsoft.com/en=gb/library/aa198360(SQL.80).aspx ADO.NET: More than a Matter of ABCs Connected and Disconnected Modes http://www.samspublishing.com/articles/article.asp p=102202&seqNum=2&rl=1 Comparison of ADO.NET and ADO http://msdn.microsoft.com/library/default.asp url=/library/en-us/vbcon/html /vbconADOPreviousVersionsOfADO.asp
Summary
SQL Server 2005 supports the following four network protocols: Shared Memory, Named Pipes, TCP/IP, and VIA. You can specify a particular network protocol in the connection string. The Microsoft Data Access Components (MDAC) library is the appropriate data provider when you are writing native code that targets Windows or you need to provide data access for an ASP application, Visual Basic 6.0x COM, or C++ application. The SQL Native Client (SNAC) was introduced with SQL Server 2005 and can be used to access new SQL Server features, such as MARS queries, database mirroring, and the XML data type. ADO.NET is the appropriate data access provider when providing data access to a managed code application for the .NET Framework. Non-Windows users can connect to SQL Server 2005 through HTTP endpoints. This is a way of exposing data from SQL Server through Web services. Endpoints can be set with one or more of the following authentication methods: Basic, Digest, Integrated, NTLM, or Kerberos. In a disconnected model, the client is disconnected from the data source after the DataSet has been populated. A data adapter is used to fill the DataSet with data retrieved from a command object. In a connected model, the client remains connected to the data source until the connection is specifically closed. The DataReader object is used to return a read-only, forwardonly stream of data.
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