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CHAPTER 7 XML IN A DO.NE T
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The advantage of this model is that you can see changes in the database in real time. However, this approach is not recommended for scalable applications because it can hamper the overall performance and scalability of the system. Also, even though ADO.NET provides cursor-oriented connected data access, it is strictly read-only and forward-only. This incurs fewer overheads and improves performance as compared to updatable cursors. You will typically use connected data access in the following situations: You are developing applications that are online all the time. For example, in a ticket reservation application it is necessary that you work with the latest data from the database. In such cases, connected data access becomes necessary. You want to avoid the overhead of using offline data. When you use queries directly against a database, naturally they bypass any of the intermediate layers that are involved in disconnected data-access techniques. For example, suppose that you wish to display a simple employee listing to the end user. This task does not involve any processing as such. Using connected data access in such cases will of course give the best performance. You need a cursor model for some reason. The Connection, Command, and DataReader classes are used for such connected data access. You will learn about these classes in later sections.
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Many modern systems need to be distributed and scalable. Consider an example of a distributed application that performs some database-intensive tasks. A typical programming approach is to open a live connection with the database and maintain it as long as the database-related tasks are in progress. This is fine if the number of users is small, but as the user base grows, the available database connections become precious. In such heavily loaded systems, a live connection approach is not recommended. The alternative is to have offline or disconnected access to the data. Disconnected data access involves the following steps: 1. Establish a connection with the database. 2. Fetch the data that you require and store it in some offline medium. 3. Close the database connection. 4. Work with the fetched data (perform read, modify, and delete operations or even calculations). 5. Again, open a database connection if you wish to update the changes made to the data back to the database. 6. Update the database, if there are any changes. 7. Close the database connection.
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As you can see, the database connection is opened only when required. You will typically use disconnected data access in the following situations: Your application data can be updated in batches. Your application does not need up-to-the minute data from the database. You want to pass data across multiple layers of your system. You want to pass data from your application to another application. Your application data is generated programmatically and is not coming from any data source. This disconnected data access is provided by a DataAdapter and a DataSet class. You will learn more about these classes in upcoming sections.
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To communicate with the data source, you need some kind of layer that will facilitate this communication for you. In the early days, Open Database Connectivity (ODBC) drivers provided such a layer. With the introduction of Object Linking and Embedding Database (OLEDB), OLEDB providers did the same job. Now, with ADO.NET it is data providers that do it for you by providing managed access to the underlying data source. The data source can be a relational database management system (RDBMS) such as SQL Server or it can be some nonrelational entity such as XML documents. Four data providers are available out of the box with ADO.NET: SQL Server data provider OLEDB data provider Oracle data provider ODBC data provider You can also build your own data provider. Each ADO.NET data provider implements a certain set of interfaces. This makes the overall object model look almost the same, irrespective of the data provider used. The following sections will give you a brief introduction to the various data providers available.
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