jasper 报告从 jasper 加载报告

Question

I'm loading the jasper reports file from .jasper file to improve the performance as below.

JasperReport rpt = (JasperReport)JRLoader.loadObjectFromFile(location);

but I have a requirement now, that a query which is formed dynamically has to be set to .jasper (compiled) file. is there a way to do the same?

Answer 1

Something like this?

Java

JasperReport rpt = (JasperReport)JRLoader.loadObject(Your .jasper file path);

Map paramMap = new HashMap();
paramMap.put("p_sql", "select * from baztable where foo='bar' and fuga='hoge' order by username");
// pass the dynamic query to .jasper file.
JasperPrint print = JasperFillManager.fillReport(rpt, paramMap, connection);

jrxml

<parameter name="p_sql" class="java.lang.String" isForPrompting="false">
    <defaultValueExpression><![CDATA["select * from baztable order by username"]]></defaultValueExpression>
</parameter>
<queryString>
    <![CDATA[$P!{p_sql}]]>
</queryString>

Answer 2

You can use the $P! (Parameter with exclamation) which can be used for conditional queries. Using this you can craft dynamic queries based on certain conditions. A guide for the same can be found here.

Answer 3

This is a hack method for the JRXML file. The JRXML file has your query. You can write a Java code or any other code to replace/write down your Query here:

Sample MongoDB Query:

<queryString language="MongoDbQuery">
    {'collectionName':'customer'}
</queryString>`

Answer 4

只需在 ireport 中打开 .jasper 文件，您就可以加载 .jasper 文件并对其进行编辑。