Question

从数据库获取数据时遇到问题。

我有一个名为purchaseorder的表，从中我有数量列使用，必须通过用户输入减去一些金额，并通过jsp页面显示结果，帮我解决问题

以下是代码，

    String pno = request.getParameter("PONo");
    String receivedQty =request.getParameter("ReceivedQty");
    int Rqty = Integer.parseInt(receivedQty);
    /*String quantity = request.getParameter("Quantity");
    int Qty = Integer.parseInt(quantity);*/

    Connection conn = null;
    try {
        Class.forName("com.mysql.jdbc.Driver");
        conn = DriverManager.getConnection("jdbc:mysql://localhost:3306", "root", "dinga");
        PreparedStatement ps = conn.prepareStatement("Select PODate,PONo,Quantity AS OrderingQty ,(Quantity-?) AS BalanceQty From project.purchaseorder where PONo=?");
        ps.setInt(1,Rqty );
        ps.setString(2,pno );

        ResultSet rs = ps.executeQuery();
        //System.out.println("resultset Value"+rs);
        if (rs.next()) {
            request.setAttribute("result", rs);
            rd = request.getRequestDispatcher("ProcessingActualGRN.jsp");
            rd.forward(request, response);
        }
    } catch (SQLException e) {
    } catch (ClassNotFoundException e) {
    } finally {
        try {
            if (conn != null) {
                conn.close();
            }
        } catch (SQLException ex) {
        }
     }
    }
    }

jsp page

    <table id="table2">
    <tr>
        <th>Iteam Discription</th>
        <th>OrderingQty</th>
        <th>PO Date</th>
        <th>Reveived Quantity</th>
        <th>Balance Quantity</th>
        <th>Received Date</th>
    </tr>
    <%
        do {
    %>  
    <tr>
        <td><%=request.getParameter("PONo") %></td>
        <td><%=rs.getInt(25)%></td>
        <td><%=request.getParameter("Quantity") %>
        <!-- <td>null(1)</td> -->
        <td><%=rs.getString(1) %></td>
        <td><%=request.getParameter("ReceivedQty")%></td>
        <td><%=request.getParameter("BalanceQty")%></td>
        <td><%=request.getParameter("ReceivedDate")%></td>
    </tr>
      <%
        } while (rs.next());
    %>`

在jsp <%=rs.getInt(25)%>中我收到错误

org.apache.jasper.JasperException：在第87行处理JSP页面/ProcessingActualGRN.jsp时发生异常

87：＆lt;％= rs.getInt（25）％＆gt;

Answer 1

EF

我得到输出我在给出索引值时犯了错误...... TQ

sql查询中的关节运算

1 个答案: