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When discussing report generation and objects, it is important to divide the idea of report generation into two groups: small reports and large reports. Some enterprise resource planning (ERP) and manufacturing resource planning (MRP) systems make exactly this distinction: small reports are often called lists, while large reports are called reports. Lists can be generated at any time and are displayed immediately on the client, while reports are typically generated in the background and are later displayed through a viewer or printed out. Of course, the exact delineation between a small and a large report varies. Ultimately, small reports require small enough amounts of data that it s reasonable to transfer that data to the client immediately upon a user request. Large reports require too much data to transfer to the client immediately, or they take too long to generate to have the user s machine (or browser) tied up while waiting for it to complete. The problem faced with reporting is twofold. First, pulling back large amounts of data from the server to the client just to generate a report is slow. In fact, it is a just a poor idea and should be avoided. Large reports should be generated using report engines that physically run on or near the database server to minimize the amount of data transferred across the network. Second, for reports that require smaller data sets that can be efficiently returned to the client machine, few of the major report engine tools support data binding against custom objects. Reports

Query OK, 1 row affected (0.00 sec)

generated with popular tools such as Crystal Reports or Active Reports can only be generated against ADO.NET objects such as the DataSet.

mysql> INSERT INTO testavg (cost, qty) VALUES (0.23, 5);

Summary

To be fair, these report engines also work in an unbound mode, in which you have the opportunity to supply the data to populate the report manually. This technique can certainly be used with business objects. You can write code to pull the data out of your objects and provide that data to the report engine as it generates the report. The trouble is that this is a lot of work, especially when compared to just binding the report to a DataSet.

Microsoft SQL Server 2005 Reporting Services and Developer Express Xtra Reports both support data binding against objects in a manner similar to Windows Forms. Ideally, in the future, more of the major report engine vendors will support data binding against objects just like Windows Forms and Web Forms do, but that s not the case today. Today, you can either generate the report from a DataSet or use the engines in unbound mode and provide the data manually. To enable the use of major report-generation tools, the ObjectAdapter class implements a converter to load a DataSet with data from objects. It allows you to convert an object into a DataSet. You can then generate reports in standard report engines such as Crystal Reports or Active Reports by using that DataSet. This approach is useful for lists, but not reports. By my definition, lists require relatively small amounts of data, so it s acceptable to transfer that data to a client and generate the report there. Reports, on the other hand, require processing large amounts of data, and the closer you can do this to the database the better. In this case, directly using Crystal Enterprise or some other server-based reporting tool to generate the report physically close to or in the database is often the best solution.

Query OK, 1 row affected (0.00 sec)

The Csla.Data.ObjectAdapter class is a utility that generates a DataSet (or more accurately, a DataTable in a DataSet) based on an object (or a collection of objects). This isn t terribly difficult, because reflection can be used to get a list of the properties or fields on the objects, and then loop through the objects properties to populate the DataTable with their values. ObjectAdapter is somewhat similar to a data adapter object such as OleDbDataAdapter, in that it implements a Fill() method that fills a DataSet with data from an object or collection. To implement a Fill() method that copies data from a source, such as a business object, into a DataSet, ObjectAdapter needs to support a certain amount of basic functionality. In ADO.NET, data is stored in a DataTable, and then that DataTable is held in a DataSet. This means that object data will be copied into a DataTable object. To do this, ObjectAdapter needs to get a list of the properties exposed by the source object. That list will be used to define the list of columns to be created in the target DataTable object. Alternatively, it will also support the concept of a preexisting DataTable that already contains columns. In that case, ObjectAdapter will attempt to find properties in the source object that match the columns that already exist in the target DataTable object. Also, rather obviously, the data values from the original data source must be retrieved. Reflection will be used to do this because it allows dynamic retrieval of the values.

mysql> INSERT INTO testavg (cost, qty) VALUES (47.50, 81);