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DataColumnCollection DataColumn DataRowCollection DataRow DataRowView DataView
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These types are all contained by instances of the DataSet object. We ll look at DataSets after we examine the data access model that s built for speed: data readers. Data readers expose a forward-only, read-only, low memory footprint architecture for data access. The
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CHAPTER 10 MANAGED PROVIDERS OF DATA ACCESS
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choice between a data reader and a DataSet is a choice between performance and functionality. Which you choose depends on what you re trying to accomplish. We ll take a look at the details of data access with data readers and with the DataSet, and then we ll examine some of the trade-offs and differences between these methods. But first, we ll examine the fundamental requirement of any data access toolset, the Connection class.
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Connections are the fundamental abstraction needed in a data access technology. A Connection object deals with the underlying technical details of establishing a network path of communication with the database server, and is also responsible for presenting the credentials of the user requesting the data to the database. This is one of the most expensive parts of communicating with the database, and is, therefore, one of the most critical resources in data access technology. For this reason, an environment that establishes a pool of connections to the database is usually desired, so that each request for data does not have to incur the overhead of knocking on the door of the database, making an introduction, and getting permission to come in and wander around.
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Connection pooling is implemented by the Managed Providers of data access. The discussion in the section pertains to the SQL- and Oracle-managed providers from Microsoft. The ODBCand OLEDB-managed providers are backwards compatibility layers, and so rely on the native pooling functionality provided by the driver or provider, respectively. Connections are established on a per-user basis. That is, two different users cannot share a connection to the database. This is true whether you re using integrated security or a database-specific security model. This works fine when a web application is executing as a dedicated user (such as ASPNET, the user the ASP .NET Framework runs as by default). When you re using impersonation and integrated security, though, code is executed with the credentials of the user that has requested the page. This leaves connection pools virtually useless, which can seriously impair the scalability of your application. For this reason, impersonation in the data access tier is not highly recommended. Instead, you should use a dedicated user account or a database user defined for the application. Pooling behavior is controlled using attributes in the connection string. You can control the minimum pool size, control the maximum pool size, or opt out of pooling altogether. When designing your application to leverage connection pools, the most important thing to keep in mind is that there is a pool allocated for each connection string and for each security context. For example, when you re using impersonation within ASP .NET, and using integrated security against the database, you can connect to the database with the following connection string: Server=YourServerName;Integrated Security=SSPI;database=Library;MinPoolSize=5 When 100 users show up, how many connection pools are there How many connections Since all users are using the same connection string, you might hope that there would be one pool. The default maximum pool size is 100, but your actual connection count will, hopefully, be much lower, as many of the users will be able to share the connections that is, they re not all going to be accessing the database at exactly the same time. This, after all, is the whole point of connection pooling.
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CHAPTER 10 MANAGED PROVIDERS OF DATA ACCESS
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Table 10-4. Connection String Attributes That Control the Managed Provider s Connection Pooling Behavior
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