Chapter 6. Retrieving Data
After creating a BIRT data source to connect to a database, text file, XML file, or web service, you specify what data to retrieve. Data sources, especially databases, typically contain more data fields than are needed for a report. Retrieving excess data fields slows report generation. This chapter discusses how to create data sets to retrieve data from the different data source types.
About data sets
A data set is an object that defines all the data that is available to a report. To create a data set, you must have an existing BIRT data source. As with data sources, BIRT Report Designer provides wizards to create data sets. The first and the only required step in creating a data set is to select the data to retrieve ...