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  Tutorial: Get disconnected with CachedRowSet , This allows for ResultSet s to be serialized, sent to remote clients, updated

The new J2EE RowSet implementation provides updateable disconnected ResultSets in your JSPs

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In spite of the ever-growing access to wireless and physical networks, it is impossible to guarantee uninterrupted database connectivity at all times. Even when reliable database connections are available, as with any other limited resource, they must be used wisely. Caching the updates will solve the problem, a solution that until recently required Java developers to design and implement the caching layer themselves.

In this article I will introduce you to a new JDBC 2.0-related class that can simplify database access code, reduce JDBC connection usage, and provide scrolling to otherwise unscrollable JDBC 1.0 result sets. The class is available from Sun as an early access release and consists of three implementations of the JDBC RowSet interface, one of which I will present in this article. That class, CachedRowSet , will be used here as the data model for a simple JSP application. You will find that it provides ideal data-caching support for smaller Web applications where Enterprise JavaBeans (EJB) are overkill.

You could consider the CachedRowSet as a "disconnected" ResultSet . It is an early implementation of the javax.sql.RowSet , and because javax.sql.RowSet extends the java.sql.ResultSet interface, you are probably already familiar with many of its methods. The RowSet interface supports the JDBC API from the JavaBeans component model perspective. It provides all the methods and features of a standard JDBC 2.0 ResultSet , but doesn't require the continuous use of a database connection. Just like any other JavaBean, implementations of javax.sql.RowSet may be serialized.

This allows for ResultSet s to be serialized, sent to remote clients, updated, and then sent back to the server. The release of the CachedRowSet is timely, since many Web developers are now familiar with updateable result sets such as Microsoft's ActiveX Data Objects (ADO). Many entry/update forms require the ability to scroll backward and forward through a set of records. Ideally the user will perform updates to the records in their cached state and then apply all the changes at once using a Save command.


 

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Get disconnected with CachedRowSet , This allows for ResultSet s to be serialized, sent to remote clients, updated

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Get disconnected with CachedRowSet , This allows for ResultSet s to be serialized, sent to remote clients, updated

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