executeUpdate无效

Question

我似乎无法让我准备好的语句执行。对于输出消息，我得到了＃34; 0航班成功更新＆＃34;而不是＆＃34; 1航班成功更新＆＃34;。我的数据库连接（在db.Conn包中）正常工作，Eclipse本身没有可见的错误。

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
    <%@page import="java.sql.*, dbConn.*" %>

            String flightid=request.getParameter("id");
            String aircraftid=request.getParameter("aircraftid");
            String OAirport=request.getParameter("OAirport");
            String OCountry=request.getParameter("OCountry");
            String DAirport=request.getParameter("DAirport");
            String DCountry=request.getParameter("DCountry");
            String ecost1=request.getParameter("ecost");
            String bccost1=request.getParameter("bccost");
            String fccost1=request.getParameter("fccost");
            String DDate=request.getParameter("DDate");
            String DTime=request.getParameter("DTime");
            String ADate=request.getParameter("ADate");
            String ATime=request.getParameter("ATime");
            String FT=request.getParameter("FT");
            String DR=request.getParameter("DiscountRate");


            Connection conn=database.getConnection();
            String sql="Update flightschedule F ,promotion P set F.aircraftid=?, F.OAirport=?,F.OCountry=?,F.DAirport=?,F.DCountry=?, F.ECost=?, F.BCcost=?,F.FCcost=?, F.DDate=?,F.DTime=?,F.ADate=?,F.ATime=?,F.Flighttime=?, P.DiscountRate=? where  F.flightid=P.flightid and F.flightid=? ";
            PreparedStatement pstmt=conn.prepareStatement(sql);

            pstmt.setString(1, flightid);
            pstmt.setInt(2, Integer.parseInt(aircraftid));
            pstmt.setString(3, OAirport); 
            pstmt.setString(4, OCountry);
            pstmt.setString(5, DAirport);
            pstmt.setString(6, DCountry);
            pstmt.setString(7, ecost1);
            pstmt.setString(8, bccost1);
            pstmt.setString(9, fccost1);
            pstmt.setString(10, DDate);
            pstmt.setString(11, DTime);
            pstmt.setString(12, ADate);
            pstmt.setString(13, ATime);
            pstmt.setString(14, FT);
            pstmt.setString(15,DR);

            int count=pstmt.executeUpdate();
            out.println(count+ " flight successfully updated");
            conn.close();

            %>

以下是我的2个数据库：

https://s9.postimg.org/xcaujfq0f/promotion_table.jpg https://s23.postimg.org/9bawk28u3/flight_schedule.jpg

我有一个FlightID的外键，来自促销参考FlightSchedule的航班ID。

P.S我知道MVC架构，但我想在使用Servlet之前先解决这个问题。

Answer 1

您正在错误地排序/设置PreparedStatement参数，请尝试以下操作：

pstmt.setInt(1, Integer.parseInt(aircraftid));
pstmt.setString(2, OAirport); 
pstmt.setString(3, OCountry);
pstmt.setString(4, DAirport);
pstmt.setString(5, DCountry);
pstmt.setString(6, ecost1);
pstmt.setString(7, bccost1);
pstmt.setString(8, fccost1);
pstmt.setString(9, DDate);
pstmt.setString(10, DTime);
pstmt.setString(11, ADate);
pstmt.setString(12, ATime);
pstmt.setString(13, FT);
pstmt.setString(14,DR);
pstmt.setString(15, flightid);