DbConnection DbCommand DbDataAdapter DbProviderFactory DbProviderFactories in .NET framework

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DbConnection DbCommand DbDataAdapter DbProviderFactory DbProviderFactories
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Using Provider Classes to Move Data
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The classes that are responsible for the movement of data between the disconnected data classes in the client application and the data store are referred to as connected classes or provider classes. The Microsoft .NET Framework contains the following providers:
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OleDb
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Contains classes that provide general-purpose data access to many data sources. You can use this provider to access SQL Server 6.5 (and earlier ver sions), SyBase, DB2/400, and Microsoft Access. Contains classes for general-purpose data access to many data sources. This provider is typically used when no newer provider is available.
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Odbc
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Contains classes that provide functionality similar to the generic OleDb provider. The difference is that these classes are tuned for SQL Server 7.0 and later data access. SQL Server 6.5 and earlier must use the OleDb provider.
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Lesson 2: Using the ADO.NET Connected Classes
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Oracle
Contains classes for accessing Oracle 8i and later servers. This provider is similar to the OleDb provider but provides better performance.
You can also use third-party providers, such as DB2 and MySql, which you can down load from the Web. Table 4-1 lists the primary provider classes and interfaces. The classes are subclassed by the provider, which replaces the Db prefix with a provider prefix, such as Sql, Ora cle, Odbc, or OleDb. You can use the base classes with factory classes to create client code that is not provider-specific. The following sections describe many of these classes.
Table 4-1
Primary Provider Classes and Interfaces in ADO.NET
Base Classes DbConnection DbCommand DbDataReader DbTransaction DbParameter DbParameterCollection DbDataAdapter DbCommandBuilder DbConnectionStringBuilder DBDataPermission
SqlClient Classes SqlConnection SqlCommand SqlDataReader SqlTransaction SqlParameter SqlParameterCollection SqlDataAdapter SqlCommandBuilder SqlConnectionStringBuilder SqlPermission
Generic Interface IDbConnection IDbCommand IDataReader/IDataRecord IDbTransaction IDbDataParameter IDataParameterCollection IDbDataAdapter
Getting Started with the DbConnection Object
To access a data store, you need a valid, open connection object. The DbConnection class is an abstract class that the provider-specific connection classes inherit from. The connection class hierarchy is shown in Figure 4-11.
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DbConnection Abstract Class Component
IDbConnection IDisposable
SqlConnection Sealed Class DbConnection ICloneable OleDbConnection Sealed Class DbConnection ICloneable IDbConnection IDisposable OdbcConnection Sealed Class DbConnection ICloneable
OracleConnection Sealed Class DbConnection ICloneable
Figure 4-11 The DbConnection class hierarchy.
To create a connection, you must have a valid connection string. The following code snippet shows how to create the connection object and then assign the connection string. When you are finished working with the connection object, you must close the connection to free up the resources being held. The pubs sample database is used in this example. The pubs and Northwind sample databases are available from the Microsoft download site and are also included on the sample disc.
'VB Dim connection as DbConnection = new SqlConnection() connection.ConnectionString = _ "Server=.;Database=pubs;Trusted_Connection=true" connection.Open() 'Do lots of cool work here connection.Close() //C# DbConnection connection = new SqlConnection(); connection.ConnectionString = "Server=.;Database=pubs;Trusted_Connection=true"; connection.Open(); //Do lots of cool work here connection.Close();
Creating an instance of the SqlConnection class using the SQL Server .NET provider creates the DbConnection. The ConnectionString property is initialized to use the local machine (".") and the database is set to pubs. Lastly, the connection uses a trusted con nection for authentication when connecting to SQL Server.
Lesson 2: Using the ADO.NET Connected Classes
The connection must be opened before you can send commands to the data store, and you must always close the connection when you re done to prevent orphaned connections to the data store. You can close the connection by executing the Close method or by executing the Dispose method. It s common to create a using block to force the Dispose method to execute, as shown in the following code snippet.
NOTE
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The using block is new to Visual Basic in 2.0 of the .NET Framework, but it has always been in C#.
'VB using (connection) connection.Open() 'cool commands here... End Using //C# using (connection) { connection.Open(); //cool commands here... }
You can place the using block inside a try/catch block to force the connection to be disposed, which typically provides a cleaner implementation than the try/catch/ finally block. Regardless of the programming language used, the connection string is the same. The following sections explain how to configure a connection string using each of the .NET providers. Open Database Connectivity (ODBC) is one of the older technologies that the .NET Framework supports, primarily because there are still many scenarios where the .NET Framework is required to connect to older database products that have ODBC drivers. Table 4-2 describes the most com mon ODBC connection string settings.
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