Hi everyone.
I'm new to Jasper and I have a big problem inserting Subreports from CSV. I've been looking for information for 3 days and can not understand what must I do.
I have a dataset named RB1 in csv format, that I need to import to Jasper. In the main report I have no problems, I can import it and show fields as I want.
The problem arises when I need to insert a subreport wirh the same database.
I create another report named SUB_1, and link it to the database RB1 as if it was an usual report, and I put the variable COLUMN_0 to be shown in the details section. I previsualize it and it is OK.
I go back to the main report and drag the item SUBREPORT to the summary section and select "select an existing report". I choose the report SUB_1 -> NEXT
I select "use same JDBC connection used to fill the master report" -> NEXT
In the Dataset Parameters I clic ADD and write:
PARAMETER NAME: COLUMN_0
PARAMETER EXPRESSION: $F{COLUMN_0}
What I'm trying to do is to link the variable COLUMN_0 of the main report with the variable COLUMN_0 in the subreport.
Now, when I try to previsualize the report, the subreport does not show.
In the Properties of the Subreport I have:
EXPRESSION: "SUB_1"
PARAMETERS MAP EXPRESSION:
CONNECTION EXPRESSION: $P{REPORT_CONNECTION}
DATA SOURCE EXPRESSION:
What am I doing wrong? I guess that many things, but could not find any answer online with this in detail in a way that I can understand it.
Thank you very much!!!!
8 Answers:
(this should be a comment on previous answer, but for some reason the interface isn't letting me do that)
The "datasource expression" is necessary because these choices you are given are really focused on the data source type. Since you are using CSV and not a JDBC connection, you can't use the same JDBC connection. When you make that choice, it is looking for JDBC and gets confused. So instead you use a datasource expression, which is for anything-but-JDBC, and set it as above to make the expression point to the same data source as the report.
I can not comment your post neither.
I do not know if I understood what you said. When I drag the subreport item to the main report, In the Connection type I can choose between:
- Use same JDBC connection used to fill the master report
- Use another connection
- Use an empty Data Source
- Use a JRDatasource expression
From what you said, I should use. "use another connection", and write the expression you said. Am i OK?
Anyway, when I do this and preview, I get the error: "The method subDataSource() is undefined for the type JRDataSource", so I am doing something wrong.
When I started this thread, I thought it could be an error in passing parameters to the subreport, since I am using Fields and not Parameters, but seems that there are too many errors in what I am doing. I really thank you for your answers, since I need to do this for my job and I am really confused.
Thank you!!
I have not used iReport in a long time so I do not remember the exact user interface but it should be something like this:
1) click on the subreport
2) On the properties window (usually on the right bottom space) at the very end you should have the connection properties
3) In "Connection Type" select the option "Use a datasource expression"
4) Another property should activate called called something like "Datasource Expression" and there you should input $P{REPORT_DATA_SOURCE}.subDataSource()
In Jaspersoft Studio you should click on the subreport element and fill the option marked in the image:
If you have any other doubts just ask.
Javier
Thank you Javier.
I already did what you said, but when running the report I get "The method subDataSource() is undefined for the JRDataSource".
I tried to put in the expression just $P{REPORT_DATA_SOURCE}, and with this, one of my subreports is half-working: I see part of my data even in the detail section, but not everything (just seeing some of the rows in details). I think I am really lost xD
I am using Jaspersoft Studio.
Thank you
Hello.
I have been thinking and looking for info and I think that the problem now could be because of the indices. The point is that when my subreport is used, there is some data that has been used by the main report, so the subreport seems not to work for the first lines. Is that possible?
If this is the problem, is there any way to make my subreports to work for all data and not just for the ones that are not used in the main report?
Thank you very much!!
I think I am really close to solve it thank to you :D:D
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