BIRT DRILLDOWN PDF

Details of Characteristics Datasets They Use Subreports and drillthrough reports can use the same dataset at the main report, or they can use a different one. Nested data regions use the same dataset. Retrieving Data Subreports and nested data regions retrieve data at the same time as the main report. Drillthrough reports do not. Each drillthrough report retrieves data when a user clicks each link.

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Details of Characteristics Datasets They Use Subreports and drillthrough reports can use the same dataset at the main report, or they can use a different one. Nested data regions use the same dataset. Retrieving Data Subreports and nested data regions retrieve data at the same time as the main report. Drillthrough reports do not. Each drillthrough report retrieves data when a user clicks each link.

This is significant if the data for the main report and the subordinate report must be retrieved at the same time. Processing and Rendering A subreport is processed as part of the main report. For example, if a subreport that displays order detail information is added to a table cell in the detail row, the subreport is processed once per row of the table and rendered as part of the main report.

A drillthrough report is only processed and rendered when the user clicks the drillthrough link in the summary main report. Performance When deciding which to use, consider using a data region instead a subreport, particularly if the subreport is not used by multiple reports.

Because the report server processes each instance of a subreport as a separate report, performance can be impacted. Data regions provide much of the same functionality and flexibility as subreports, but with better performance. Use of Parameters Drillthrough reports and subreports typically have report parameters that specify which report data to display.

For example, when you click a sales order number in a main report, a drillthrough report opens, which accepts the sales order number as a parameter, and then displays all the data for that sales order. When you create the link in the main report, you specify values to pass as parameters to the drillthrough report. To create a drillthrough report or subreport, you must design the target drillthrough report or subreport first and then create a drillthrough action or add the reference to the main report.

Reusability Subreports and drillthrough reports are separate reports. Thus, they can be used in a number of reports, or displayed as standalone reports.

Nested data regions are not reusable. You cannot save them as report parts because they are nested in a data region. You can save the data region that contains them as a report part, but not the nested data region. Subreports can be on the same or a different report server, but drillthrough reports must be on the same report server. Nested data regions are part of the main report.

Display Subreports and nested data regions are displayed in the main report. Drillthrough reports are displayed on their own. In This Section.

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Drillthrough, Drilldown, Subreports, and Nested Data Regions

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