Java DB 和 jasper 报告嵌套 select

Question

我在来自 JAVA DB 的 Jasper Netbeans 报告中创建嵌套 select 视图为运行，并且需要通过 [= 根据以下相同语句区分分组15=] 注入 select 或使用 if 在 JAVA 数据库或任何其他方式中是可行的，最后我想使用记录集作为源查询到运行 jasper 报告我的代码如下

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
 try {
   String host1= "jdbc:derby://localhost:1527//home/mohamed/java- 
   progs/SPaccounting/accountsdb/accountsdb;create=true";
   String uName1="rootuser";
   String uPass1="1234a1234b";
   con1=DriverManager.getConnection(host1,uName1 ,uPass1);
   String sql1="select sum(journal_amount) AS DR ,0 as CR, journal_crname  AS 
   ACCNAME FROM JOURNAL
   GROUP BY journal_CRNAME UNION select 0 AS DR,sum(journal_amount) AS   CR,  
   journal_dbname AS ACCNAME FROM JOURNAL
   GROUP BY journal_DRNAME order by ACCNAME
   ";
   JasperFillManager.fillReport(jasperReport,param1,connect); //add param    
   if   required    
   String jrxmlFileName = "/home/mohamed/java-progs/accounting syst em/     
   JavaAaccountingsys/src/report1.jrxml";
   JasperDesign jasperDesign = JRXmlLoader.load(jrxmlFileName);


   JasperReport jasperReport = JasperCompileManager.compileReport(jasperDesign);
   JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, null,    con1);
   JasperViewer.viewReport(jasperPrint); 
   } catch (JRException e) {
        e.printStackTrace();
   } catch (ClassNotFoundException e) {
        e.printStackTrace();
   } catch (SQLException e) {
    e.printStackTrace();
 }
}

输出为：

ACCNAME     DR       CR
--------    ----    -----
CASH         1,200   0
AMRO BANK    0       500
CASH         0       600
AMRO BANK    700     0

我想对上面进行区分和求和，并从信贷 CR 中削减债务 DR 并得到如下报告的结果：

ACCNAME     DR       CR
--------    ----    -----
CASH         600     0
AMRO BANK    200     0

请协助更正select声明

Answer 1

是的，我在 SO 中得到了正确的 select 语句，将输出分组在一个嵌套包中，在 select 语句下方添加报告工作正常然后只需创建一个子查询即可获得最后一步

SELECT ACCNAME,
CASE WHEN SUM(CREDIT - DEBT) < 0 THEN - SUM(CREDIT - DEBT)
ELSE 0
 END DEBT,
   CASE WHEN SUM(CREDIT - DEBT) > 0 THEN   SUM(CREDIT - DEBT)
        ELSE 0
   END CREDIT
FROM ( ...... ) myTable
GROUP BY ACCNAME ;

所以我走对了。

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