如何使用 Main 和 Subreport 两种不同的数据源创建 iReport

Question

I need to create a report combining data from SQL server and from PostgreSQL. I was already looking for tutorials online but got no help.

I already have created before reports with multiple subreports but using only one data source. But never done multiple data source.

Answer 1

You can create Map of parameters and put sql in map, then send parameters to report. sql could be created from any data base

Map parameters = new HashMap();
parameters.put("SQL_INPUT", sql);
JasperFillManager.fillReport(reportFile.getPath(), parameters, connection);

in report you create parameter with name SQL_INPUT and replace query with $P!{SQL_INPUT}