Question

我有3个查询：

// (1)
String sql = "SELECT tblClientInfo.ClientID, tblrefmarket.MarketDesc, tblclientinfo.LastName, tblledger.LoanAmount, "
+ "tblledger.DateStarted, tblledger.DailyPay, tblledger.Expiry FROM tblclientinfo Inner Join tblbusinessinfo ON tblbusinessinfo.ClientID = tblclientinfo.ClientID "
+ "Inner Join tblrefmarket ON tblbusinessinfo.MarketID = tblrefmarket.MarketID "
+ "Inner Join tblledger ON tblledger.ClientID = tblclientinfo.ClientID where MarketDesc = ?";

// (2)
String sumSQL = "SELECT ClientID, sum(tblloanpayment.AmountPaid) as sum FROM tblloanpayment where tblloanpayment.ClientID= ? ";

// (3)
String balSQL = "SELECT (SELECT tblLedger.LoanAmount from tblLedger WHERE tblLedger.ClientID = ?) - (SELECT SUM(tblLoanPayment.AmountPaid) "
+ "FROM tblLoanPayment WHERE tblLoanPayment.ClientID = ?) as balance FROM dual; ";

我已执行此3个查询以在jTable上显示信息。它很成功。

现在我的问题是我使用JasperReports生成报告（或打印）。

我只能显示第一个查询，因为它在数据库中。而查询2和3则不是。它们只是对查询1中付款的计算。

我如何加入这个以便能够显示所有必要的信息？

这是我的代码：

private void cmdPrintActionPerformed(java.awt.event.ActionEvent evt) {
    int row = tableMarket.getSelectedRow();
    try {
        JasperDesign jasperDesign = JRXmlLoader.load("notes receivables.jrxml");
        String sql = "SELECT tblClientInfo.ClientID, tblrefmarket.MarketDesc, tblclientinfo.LastName, tblledger.LoanAmount, "
                + "tblledger.DateStarted, tblledger.DailyPay, tblledger.Expiry FROM tblclientinfo Inner Join tblbusinessinfo ON tblbusinessinfo.ClientID = tblclientinfo.ClientID "
                + "Inner Join tblrefmarket ON tblbusinessinfo.MarketID = tblrefmarket.MarketID "
                + "Inner Join tblledger ON tblledger.ClientID = tblclientinfo.ClientID where MarketDesc = '" + tableMarket.getModel().getValueAt(row, 0).toString() + "'";
        JRDesignQuery newQuery = new JRDesignQuery();
        newQuery.setText(sql);
        jasperDesign.setQuery(newQuery);
        JasperReport jasperReport = JasperCompileManager.compileReport(jasperDesign);
        JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, null, conn);
        JasperViewer.viewReport(jasperPrint);

    } catch (Exception e) {
        e.printStackTrace();
        JOptionPane.showMessageDialog(null, e);
    }
}

此代码仅显示第一个查询。

Answer 1

您已在第一个查询中选择tblLedger.LoanAmount，因此第二个和第三个查询所需的唯一附加信息是sum(tblloanpayment.AmountPaid)。尝试：

SELECT c.ClientID, 
       m.MarketDesc, 
       c.LastName, 
       l.LoanAmount, 
       l.DateStarted, 
       l.DailyPay, 
       l.Expiry,
       s.sumPaid,
       l.LoanAmount - s.sumPaid as balance
FROM tblclientinfo c
Inner Join tblbusinessinfo b ON b.ClientID = c.ClientID 
Inner Join tblrefmarket m ON b.MarketID = m.MarketID
Inner Join tblledger l ON l.ClientID = c.ClientID 
left join (SELECT ClientID, sum(AmountPaid) as sumPaid 
           FROM tblloanpayment group by ClientID) s on c.ClientID = s.ClientID 
where m.MarketDesc = ?

Answer 2

在第二次和第三次查询中删除客户端ID的限制。将它们设置为子选择（即将它们放在括号中）并创建一个大的选择，将所有三个子选择连接到客户端ID上。

修改

因此，如果三个查询是query1，query2，query3，那么你最终会得到

select ... from (query1) baseSql join (query2) sumSql on baseSql.clientId = sumSql.clientId join (query3) balSql on baseSql.clientId = balSql.clientId

如果left join或join中缺少baseSql中的行，则可能需要使用sumSql代替balSql。

将3个查询加入1个表时如何查询？

2 个答案: