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Implement features to handle concurrency issues In a multiuser application, it is possible for two users to modify the same data You need to add code to handle this situation One way to handle concurrency is to use a TimeStamp field See the Additional Reading section for references to database books that cover this topic Create a stored procedure generator One of the most tedious and error-prone tasks is creating all the stored procedures or queries required for your application Implement a stored procedure generator to save time (see Additional Reading ) Implement parameter discovery Probably the second-most tedious task in working with the data access layer is defining all the parameters for calling Save stored procedures It would be better if the DAC could discover the parameters for you If you are using SQL Server, you can use the following method to discover the parameters from the SqlCommand object:
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8 BUILDING THE DATA ACCESS LAYER
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If you are not using SQL Server, but you did name the parameters using the same names as the columns, you can discover the parameters yourself Pass the DataRow into the DAC method, and build the parameters from the column information accessible from the DataRow Add more DAC methods Add methods to the DAC similar to ExecuteDataTable that instead return a DataSet, DataReader, or any other type of data container that your application may want to use
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You now have an operational application and the beginnings of an application framework!
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Additional Reading
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Goldstein, Jackie Microsoft SQL Server 2005 Express Edition Step by Step Microsoft Press, 2006 Teach yourself how to get a data-intensive application up and running quickly with SQL Server Express Edition one step at a time With this book, you work at your own pace through hands-on, learn-by-doing exercises Whether you re new to database programming or new to SQL Server, you ll learn how, when, and why to use speci c features of this simple but powerful database development environment Each chapter
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puts you to work, building your knowledge of core capabilities and guiding you as you create actual components and working applications Kurata, Deborah Building a Stored Procedure Generator CoDe magazine, September/October 2005 Creating basic data access stored procedures is boring, time-consuming work Relieve the tedium by writing code that writes these stored procedures for you This article presents all the code you need to build your own stored procedure generator MSDN Writing Provider Independent Code for NET Framework Data Providers http://msdn2microsoftcom This topic is an overview of building data-provider-independent code using DbProviderFactories It provides links to more information on this topic Since things seem to move around on MSDN, it did not seem useful to provide the direct link to this help topic To quickly nd this information, search on the title Vaughn, William R Hitchhiker s Guide to Visual Studio and SQL Server, Seventh Edition Addison Wesley, 2006 This book is designed for the ordinary developer who wants to become an expert It has chapters like How Does SQL Server Work and information that can help developers build smarter, faster, and more robust applications more quickly It talks about design principles, architecture, and best practices
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Here are a few suggestions for trying some of the techniques presented in this chapter: 1 Add a SalesRep table to your database using Server Explorer 2 Add sample data to the SalesRep table 3 Add stored procedures to retrieve data from and save data to the SalesRep table 4 Modify the Create method of the SalesRep class to call the DAC and display your sample data instead of the hard-coded data 5 Add a Save method in the SalesRep class, and call the method from the UI as appropriate You can then modify SalesRep data 6 If you are up for a challenge, add a method to the DAC that takes a DataRow as a parameter and automatically builds the parameters for the save stored procedures based on data in the DataRow
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