处理Jasper报告中的大量数据 - 开始 [英] Handle Huge Data in Jasper Reports - pagining
问题描述
我想在创建PDF时处理大量数据,我知道在Jasper Reports中有一个名为Virtualizers的东西,但我不知道如何处理从DAO检索数据时触发的内存不足异常,我不知道如何在Jasper报告数据源中实现分页。
I want to handle huge data in creating PDF, I know there is a thing called Virtualizers in Jasper Reports, but i don't know how to handle the out of memory exception that is fired when i retrieve the data from the DAOs, I don't know how to implement pagination in Jasper reports datasources.
推荐答案
您需要自定义JRDatasource和Virtualizer的实现,你的JRDatasource实现应该以块的形式加载数据
You need a custom implementation of JRDatasource and a Virtualizer, Your implementation of JRDatasource should load data in chunks
你也可以在jasperreports.properties中设置net.sf.jasperreports.jdbc.fetch.size,如果你使用的是JRResultSetDataSource
You can set net.sf.jasperreports.jdbc.fetch.size in jasperreports.properties too, if you are using JRResultSetDataSource
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