问题
I have a build up a report with a .CSV input file as DataAdapter. After that I needeed a table to put some data into a it and a linked dataset. The problem is: if I leave blank the section "Default Data Adapter" in my Dataset1, no data will be displayed. In fact, to fix this report I had to export my DataAdapter as myDataAdapter.xml and then put this file in the section "Default Data Adapter" of my Dataset1 (as shown in the attached picture).
Working with database I have never set up this property.
Is there a way to pass this property as Param? (I have a java code in which I call jasperReport and I want to pass this object dinamically).
Or is there a way the report works without setting this property?
In the section Table>Dataset I have this situation:
where I set up JRDatasource expression, but it is not working...
I have one more problem. Can I set dinamically the location of my .csv inside the DataAdapter.xml?
Is it possible to implement "myDataAdapter.xml" from java code and pass it to the report??
Thank you in advance!
回答1:
In Java code you can set properties on the net.sf.jasperreports.engine.JasperReport instance like in this sample here, from the official repository. The relevant code looks like this:
...
JasperReport jasperReport = ...
...
jasperReport = (JasperReport)JRLoader.loadObjectFromFile("build/reports/ExcelXlsxQeDataAdapterReport.jasper");
jasperReport.setProperty(DataAdapterParameterContributorFactory.PROPERTY_DATA_ADAPTER_LOCATION, "data/XlsxQeDataAdapter.xml");
...
The property of interest is net.sf.jasperreports.data.adapter and is stored in DataAdapterParameterContributorFactory.PROPERTY_DATA_ADAPTER_LOCATION
The data adapter file is a convenience method to pass a series of parameters from which a net.sf.jasperreports.engine.data.JRCsvDataSource is built. If you want to skip passing this property, you would have to manually provide the built-in parameters listed in the net.sf.jasperreports.engine.query.JRCsvQueryExecuterFactory.CSV_BUILTIN_PARAMETERS.
来源：https://stackoverflow.com/questions/60043708/jrdataset-property-csv-file