Jasper Reports中的空白子报告 [英] Blank subreport in Jasper Reports

问题描述

我正在尝试启动我在iReport中创建的报告，其中包含主报告和子报告。在iReport中，子报表启动正常并包含数据，但是当我尝试从我的java代码中启动它时，子报表是空白的。

I'm trying to launch a report that I created in iReport which contains a main report and a subreport. In iReport, the subreport launches fine and contains data, however when I try to launch it from within my java code, the subreport is blank.

我做了什么远：

• 主报表中有一个名为SUBREPORT的String参数，用于定义子报表的路径。例如。值：E：\ _java \ReportLauncher \\ \\ _reports \ test_subreport1.jasper

• I have a String parameter in the main report called "SUBREPORT" that is used to define the path to the subreport. E.g. value: "E:\java\ReportLauncher\reports\test_subreport1.jasper"

主报表中的子报表表达式设置为：$ P {SUBREPORT}

The subreport expression in the main report is set to: $P{SUBREPORT}

子报表连接表达式为：$ P {REPORT_CONNECTION}

The subreport connection expression is: $P{REPORT_CONNECTION}

我还定义了一个名为INVOICE_NUMBER的子报表参数，该参数设置为$ F {InviInvNo}，映射到主报表中的字段。

I also have a subreport parameter defined called "INVOICE_NUMBER" that is set to $F{InviInvNo}, which maps to a field in the main report.

在我的java代码中，我有：

In my java code, I have:

HashMap<String, Object> paramHash = new HashMap();
paramHash.put("INVOICE_NUMBER", invoiceID);
paramHash.put("REPORT_CONNECTION", this.conn);
paramHash.put("SUBREPORT", subReportPath);

JasperPrint jasperprint = JasperFillManager.fillReport(this.reportPath, paramHash, this.conn);

主报告已正确创建并已填充。然而，子报告区域是空白的。对于我做错了什么的任何想法？

The main report is created fine and is populated. The subreport area however is blank. Any thoughts for what I'm doing wrong?

提前致谢，
Andy。

Thanks in advance, Andy.

推荐答案

由于您没有提及有关子报表查询的任何内容：

Since you didn't mention anything about the subreport query:

如果您在子报表中使用详细信息区域，那么您将需要报告的数据查询。

If you are using the Detail Band in the subreport, then you will need a Data Query for the report.

在旧的iReport中，从数据菜单中选择报告查询并在此处写下您的查询。如果只需要一个记录（即只有一次详细信息带），则可以使用虚拟表。喜欢：

In old iReport, from Data menu, choose Report Query and write your query here. If you want only one record (i.e. Detail band only one time) you can use a dummy table. Like:

SELECT 'a' FROM DUMMY

否则，如果您不想使用细节带，您可以选择在不使用查询的情况下查看其他带。从编辑菜单中，选择报告属性，更多... 标签，设置标志当没有数据到所有部分，没有细节

Otherwise, if you don't want to use the Detail Band, you have the option to view the other bands without using a query. From Edit menu, choose Report Properties, under More... tab, set the flag When no data to All Sections, no detail

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