Executing a Report Template
If data binding or scripting is specified in a report template, the queries and script must be processed
before the template can be used to create the final executed report, which may further be previewed (using the
Previewer) or exported to one of the many supported file formats. A manager class, XSessionManager, provides
the API for managing all queries and script defined in a report template. A client front-end application can
execute a report in one step:
ReportSheet report = …;
. . .
XSessionManager.getSessionManager().execute(report);
Previewer previewer = new Previewer();
previewer.print(report);
previewer.pack();
previewer.setVisible(true);
Executing a report by this method actually performs three steps:
• If any query in a report requires parameters, the execute() call prompts end users for the parameter
values.
• All queries in a report are executed. If any parameters are collected in the first step, they are
grouped according to the queries they belong to and passed to the query execution.
• The query results are bound to each report element that the query is associated with.
Exporting a Report Template
It is important to distinguish between a template and a report. A template is an XML document, which contains
layout information for report elements. A report is the final output generated after running a report
application. A template therefore only contains meta-information about a report. Exporting a template as a
template will only save the meta-information and will not capture all report data.
To export a report template to one of the many supported formats, we can use the builder class:
Builder builder = Builder.getBuilder(Builder.PDF,
new FileOutputStream("pdfexp.pdf"));
builder.write(report);
Refer to the Import/Export Report File Formats section for a more detailed description of the report
exporting API.
Summary of the Use of Report Templates
This chapter described the API that influences report templates created by the visual Designer. Report
templates can be imported into a Java Program as ReportSheet objects. We also discussed template processing,
which concerns binding data to an element on a template; and template execution, which executes scripts and
queries bound to elements. Adding table styles, and all other formatting operations, should be performed at
the template level using the Report Designer.
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