将参数传递给 Jasper 报告的问题答案

【问题标题】：Issues in passing parameters to Jasper Reports将参数传递给 Jasper 报告的问题
【发布时间】：2014-12-17 05:04:57
【问题描述】：

我正在尝试将 2 个参数传递给 Jasper 报告并获得结果。在 SQL 查询中，我将它们与下面的查询结合起来。

SELECT 
ROUND(SUM(case when Updated_Date BETWEEN $P{secondYear}+"-03-01" AND $P{secondYear}+"-03-31" then Amount else 0 end),2) AS `March` ,
ROUND(SUM(case when Updated_Date BETWEEN $P{secondYear}+"-02-01" AND $P{secondYear}+"-02-29" then Amount else 0 end),2) AS `February` ,
ROUND(SUM(case when Updated_Date BETWEEN $P{secondYear}+"-01-01" AND $P{secondYear}+"-01-31" then Amount else 0 end),2) AS `January` ,
ROUND(SUM(case when Updated_Date BETWEEN $P{firstYear}+"-12-01" AND $P{firstYear}+"-12-31" then Amount else 0 end),2) AS `December` ,
ROUND(SUM(case when Updated_Date BETWEEN $P{firstYear}+"-11-01" AND $P{firstYear}+"-11-31" then Amount else 0 end),2) AS `November` ,
ROUND(SUM(case when Updated_Date BETWEEN $P{firstYear}+"-10-01" AND $P{firstYear}+"-10-31" then Amount else 0 end),2) AS `October` ,
ROUND(SUM(case when Updated_Date BETWEEN $P{firstYear}+"-09-01" AND $P{firstYear}+"-09-31" then Amount else 0 end),2) AS `September` ,
ROUND(SUM(case when Updated_Date BETWEEN $P{firstYear}+"-08-01" AND $P{firstYear}+"-08-31" then Amount else 0 end),2) AS `August` ,
ROUND(SUM(case when Updated_Date BETWEEN $P{firstYear}+"-07-01" AND $P{firstYear}+"-07-31" then Amount else 0 end),2) AS `July` ,
ROUND(SUM(case when Updated_Date BETWEEN $P{firstYear}+"-06-01" AND $P{firstYear}+"-06-31" then Amount else 0 end),2) AS `June`, 
ROUND(SUM(case when Updated_Date BETWEEN $P{firstYear}+"-05-01" AND $P{firstYear}+"-05-31" then Amount else 0 end),2) AS `May`,
ROUND(SUM(case when Updated_Date BETWEEN $P{firstYear}+"-04-01" AND $P{firstYear}+"-04-31" then Amount else 0 end),2) AS `April` 
FROM VAT

但是，在我的 Jasper 报告中，我得到的所有月份的增值税一直都是 0。我做错了什么？

【问题讨论】：

您需要提供更多详细信息。您如何在代码中传递参数？ JRXML中的参数是如何定义的？
@jschoen：我仍然没有转向代码。通过 Jaspersoft studio 传递参数。上面的查询是我在 jasper 中使用的原始查询。
我对 Jaspersoft studio 不太熟悉，但我知道使用 ireport 在您预览时会提示您输入参数值。你得到类似的东西吗？如果没有，您可以将每个参数的默认值设置为您想要尝试的值，看看会发生什么。
@jschoen：是的，提示进来了。
您如何确定查询是正确的？如果您将参数部分替换为刚刚硬编码的值，您会得到预期的结果吗？

标签： java mysql sql parameters jasper-reports

【解决方案1】：

我找到了答案。在 jasper 报告中，如果您想在 SQL 查询中像 String 一样组合 parameters，则不应使用 + 符号。所以正确的代码如下。

SELECT 
ROUND(SUM(case when Updated_Date BETWEEN $P{secondYear}"-03-01" AND $P{secondYear}"-03-31" then Amount else 0 end),2) AS `March` ,
ROUND(SUM(case when Updated_Date BETWEEN $P{secondYear}"-02-01" AND $P{secondYear}"-02-29" then Amount else 0 end),2) AS `February` ,
ROUND(SUM(case when Updated_Date BETWEEN $P{secondYear}"-01-01" AND $P{secondYear}"-01-31" then Amount else 0 end),2) AS `January` ,
ROUND(SUM(case when Updated_Date BETWEEN $P{firstYear}"-12-01" AND $P{firstYear}"-12-31" then Amount else 0 end),2) AS `December` ,
ROUND(SUM(case when Updated_Date BETWEEN $P{firstYear}"-11-01" AND $P{firstYear}"-11-31" then Amount else 0 end),2) AS `November` ,
ROUND(SUM(case when Updated_Date BETWEEN $P{firstYear}"-10-01" AND $P{firstYear}"-10-31" then Amount else 0 end),2) AS `October` ,
ROUND(SUM(case when Updated_Date BETWEEN $P{firstYear}"-09-01" AND $P{firstYear}"-09-31" then Amount else 0 end),2) AS `September` ,
ROUND(SUM(case when Updated_Date BETWEEN $P{firstYear}"-08-01" AND $P{firstYear}"-08-31" then Amount else 0 end),2) AS `August` ,
ROUND(SUM(case when Updated_Date BETWEEN $P{firstYear}"-07-01" AND $P{firstYear}"-07-31" then Amount else 0 end),2) AS `July` ,
ROUND(SUM(case when Updated_Date BETWEEN $P{firstYear}"-06-01" AND $P{firstYear}"-06-31" then Amount else 0 end),2) AS `June`, 
ROUND(SUM(case when Updated_Date BETWEEN $P{firstYear}"-05-01" AND $P{firstYear}"-05-31" then Amount else 0 end),2) AS `May`,
ROUND(SUM(case when Updated_Date BETWEEN $P{firstYear}"-04-01" AND $P{firstYear}"-04-31" then Amount else 0 end),2) AS `April` 
FROM VAT

如果您使用的是 Jaspersoft Studio，它将在查询编辑器中显示为错误。但是，它可以正常工作。

【讨论】：