.net ean 13 Designing a Data Access Strategy in .NET framework

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Designing a Data Access Strategy
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Table 1-1
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Recommended Use Use if you are writing native code targeting Windows or if you need to write a classic ASP application, Visual Basic 6.0x COM application, or C++ application. Use if you need to access the latest features in SQL Server 2005 using ODBC or OLE DB. Use if you are writing a managed code application for the .NET Framework.
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Data Access Technology MDAC SNAC ADO.NET
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How to Connect by Using ADO.NET
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ADO.NET is tightly integrated with the .NET Framework and can be used to build data access applications using any of the supported languages. It is comprised of two main areas:
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Represent each data source available to your application. There is a provider for SQL Server and another one for Oracle. Third-party companies can create providers for other databases as well. Services Represent what is done with the data returned by a provider. For example, there is one service that provides an in-memory cache so that data can be maintained inside a dataset. ADO.NET is included with the .NET Framework, so you do not have to do anything special to access it. Everything you need is provided in the System.Data namespace. You will have to set a reference to the specific namespace required. The namespace you use is dependent on the data source you are trying to access. For example, if you are trying to access a SQL Server 7.x database, you will set a reference to the System.Data.SqlClient namespace. Refer to Table 1-2 to determine the correct namespace to reference. The following code would need to be placed at the top of any code file that makes a connection to the database:
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//C# using System.Data.SqlClient; 'VB Imports System.Data.SqlClient
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Providers
Lesson 1: Designing Data Access Technologies
Table 1-2
Namespaces and Objects Used to Connect to Data Sources
Namespace System.Data.SqlClient System.Data.OleDb System.Data.Odbc System.Data.OracleClient Object Name SQLConnection OleDbConnection OdbcConnection OracleConnection
Data Source SQL Server database, version 7.x OLE DB database or SQL Server database, version 6.5 or earlier ODBC database Oracle client
Each provider has a connection object that is used to establish a connection with the data source, as shown in Table 1-2. You will need to create an instance of the connection object and then set the connection properties before opening the connection. You set the connection properties through a connection string. The connection string will vary depending on the data source, but for most data sources, you will need to specify the server name, database name, and any authentication credentials. Following is an example of the code needed to open a connection to the SQL Server 2005 database for the fictional company named Adventure Works.
//C# //Open the Connection to SQL Server Express string connString = @"server=.\sqlexpress;Integrated Security=SSPI;initial catalog=AdventureWorks"; sqlConn = new SqlConnection(connString); sqlConn.Open(); 'VB 'Open the connection to SQL Server Express Dim connString As String = "server=.\sqlexpress;Integrated Security=SSPI;initial catalog=AdventureWorks" sqlConn.ConnectionString = connString sqlConn.Open()
How to Connect by Using MDAC
MDAC consists of multiple APIs that ship with the Windows operating system. You have a choice of three interfaces:
ODBC OLE DB ADO
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Designing a Data Access Strategy
Open Database Connectivity
ODBC provides a way for developers to connect to any kind of data source and is the most widely accepted method of data access. Using software drivers, it enables you to access a variety of data sources, such as a Microsoft Office Access database, a Microsoft Office Excel spreadsheet, and a Microsoft Visual FoxPro database. Any third-party database vendor can write a software driver that adheres to the ODBC standards in order to provide an interface to their data. ODBC requires you to set up a Data Source Name (DSN), which identifies the correct driver to utilize. The name of the DSN will be used in the connection string employed to connect to the database. To create a DSN, click Start, Control Panel, Administrative Tools, Data Sources (ODBC). The Drivers tab will list all the ODBC drivers available for your computer, as shown in Figure 1-3.
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