Java 在MySQL中插入多行

我正在尝试将下面的详细信息从jtextfields插入数据库。 要插入的列是Guest表中的roomNumberSelected、guestName、passportNo、phoneNo

当前在编译时，它只插入最后一行数据。我正在我的应用程序中实现三层体系结构。我认为我必须修改SQL语句以插入 多个值，但我不确定如何实现

UI-GuestDetails.java

所需房间数等于所选房间数。在这种情况下，noOfSelectedRooms=5

if(noOfRoomsSelected=="1"){

                if(name1.isEmpty()||passportNo1.isEmpty()||phoneNo1.isEmpty()){
                    JOptionPane.showMessageDialog(null, "Some Required field(s) are not entered. Please try again.");
                }

                else{
                g.setSelectedRoomNum(comboBox1.getSelectedItem().toString());
                g.setGuestPassportNo(tfPassportNo1.getText());
                g.setGuestName(tfGuestName1.getText());
                g.setGuestPhoneNo(tfPhoneNo1.getText());
                }
            }

            else if(noOfRoomsSelected=="2"){

                if(name1.isEmpty()||passportNo1.isEmpty()||phoneNo1.isEmpty()
                        ||name2.isEmpty()||passportNo2.isEmpty()||phoneNo2.isEmpty()){

                    JOptionPane.showMessageDialog(null, "Some Required field(s) are not entered. Please try again.");
                }

                else{
                g.setSelectedRoomNum(comboBox1.getSelectedItem().toString());
                g.setGuestPassportNo(tfPassportNo1.getText());
                g.setGuestName(tfGuestName1.getText());
                g.setGuestPhoneNo(tfPhoneNo1.getText());
                g.setSelectedRoomNum(comboBox2.getSelectedItem().toString());
                g.setGuestPassportNo(tfPassportNo2.getText());
                g.setGuestName(tfGuestName2.getText());
                g.setGuestPhoneNo(tfPhoneNo2.getText());
                }
            }

            else if(noOfRoomsSelected=="3"){

                if(name1.isEmpty()||passportNo1.isEmpty()||phoneNo1.isEmpty()
                        ||name2.isEmpty()||passportNo2.isEmpty()||phoneNo2.isEmpty()||
                        name3.isEmpty()||passportNo3.isEmpty()||phoneNo3.isEmpty()){
                    JOptionPane.showMessageDialog(null, "Some Required field(s) are not entered. Please try again.");
                }

                else {

                g.setSelectedRoomNum(comboBox1.getSelectedItem().toString());
                g.setGuestPassportNo(tfPassportNo1.getText());
                g.setGuestName(tfGuestName1.getText());
                g.setGuestPhoneNo(tfPhoneNo1.getText());
                g.setSelectedRoomNum(comboBox2.getSelectedItem().toString());
                g.setGuestPassportNo(tfPassportNo2.getText());
                g.setGuestName(tfGuestName2.getText());
                g.setGuestPhoneNo(tfPhoneNo2.getText());
                g.setSelectedRoomNum(comboBox3.getSelectedItem().toString());
                g.setGuestPassportNo(tfPassportNo3.getText());
                g.setGuestName(tfGuestName3.getText());
                g.setGuestPhoneNo(tfPhoneNo3.getText());
                   }
            }

            else if(noOfRoomsSelected=="4"){
                if(name1.isEmpty()||passportNo1.isEmpty()||phoneNo1.isEmpty()
                        ||name2.isEmpty()||passportNo2.isEmpty()||phoneNo2.isEmpty()||
                        name3.isEmpty()||passportNo3.isEmpty()||phoneNo3.isEmpty()
                        ||name4.isEmpty()||passportNo4.isEmpty()||phoneNo4.isEmpty()){
                    JOptionPane.showMessageDialog(null, "Some Required field(s) are not entered. Please try again.");
                }

                else{
            g.setSelectedRoomNum(comboBox1.getSelectedItem().toString());
            g.setGuestPassportNo(tfPassportNo1.getText());
            g.setGuestName(tfGuestName1.getText());
            g.setGuestPhoneNo(tfPhoneNo1.getText());
            g.setSelectedRoomNum(comboBox2.getSelectedItem().toString());
            g.setGuestPassportNo(tfPassportNo2.getText());
            g.setGuestName(tfGuestName2.getText());
            g.setGuestPhoneNo(tfPhoneNo2.getText());
            g.setSelectedRoomNum(comboBox3.getSelectedItem().toString());
            g.setGuestPassportNo(tfPassportNo3.getText());
            g.setGuestName(tfGuestName3.getText());
            g.setGuestPhoneNo(tfPhoneNo3.getText());
            g.setSelectedRoomNum(comboBox4.getSelectedItem().toString());
            g.setGuestPassportNo(tfPassportNo4.getText());
            g.setGuestName(tfGuestName4.getText());
            g.setGuestPhoneNo(tfPhoneNo4.getText());
                }
            }


            else if(noOfRoomsSelected=="5"){

                if(name1.isEmpty()||passportNo1.isEmpty()||phoneNo1.isEmpty()
                        ||name2.isEmpty()||passportNo2.isEmpty()||phoneNo2.isEmpty()||
                        name3.isEmpty()||passportNo3.isEmpty()||phoneNo3.isEmpty()
                        ||name4.isEmpty()||passportNo4.isEmpty()||phoneNo4.isEmpty()
                        ||name5.isEmpty()||passportNo5.isEmpty()||phoneNo5.isEmpty()){
                    JOptionPane.showMessageDialog(null, "Some Required field(s) are not entered. Please try again.");
                }

                else{
                g.setSelectedRoomNum(comboBox1.getSelectedItem().toString());
                g.setGuestPassportNo(tfPassportNo1.getText());
                g.setGuestName(tfGuestName1.getText());
                g.setGuestPhoneNo(tfPhoneNo1.getText());
                g.setSelectedRoomNum(comboBox2.getSelectedItem().toString());
                g.setGuestPassportNo(tfPassportNo2.getText());
                g.setGuestName(tfGuestName2.getText());
                g.setGuestPhoneNo(tfPhoneNo2.getText());
                g.setSelectedRoomNum(comboBox3.getSelectedItem().toString());
                g.setGuestPassportNo(tfPassportNo3.getText());
                g.setGuestName(tfGuestName3.getText());
                g.setGuestPhoneNo(tfPhoneNo3.getText());
                g.setSelectedRoomNum(comboBox4.getSelectedItem().toString());
                g.setGuestPassportNo(tfPassportNo4.getText());
                g.setGuestName(tfGuestName4.getText());
                g.setGuestPhoneNo(tfPhoneNo4.getText());
                g.setSelectedRoomNum(comboBox5.getSelectedItem().toString());
                g.setGuestPassportNo(tfPassportNo5.getText());
                g.setGuestName(tfGuestName5.getText());
                g.setGuestPhoneNo(tfPhoneNo5.getText());
                }
            }

实体类-Guest.java

public boolean createGuestRecord(Guest g){
        boolean success = false;
        DBController db = new DBController();
        String dbQuery;

    //step 1 - establish connection to database
        try{
        db.getConnection();     

        dbQuery = "INSERT INTO guest(selectedRoomNum,guestPassportNo,guestName,guestPhoneNo,passNo)";
          dbQuery = dbQuery + " VALUES ('" + selectedRoomNum + "','" + guestPassportNo+ "','" + guestName + "','" + guestPhoneNo + "','" + passNo + "')";




        //step 3 - to insert record using updateRequest method
            if (db.updateRequest(dbQuery) == 1){ //record inserted
                success = true;
            }
        }

        catch(Exception e){
            System.out.println(e);
        }

        //step 4 - close connection
        db.terminate();

        return success;


    }

---

当然，你只有最后一张唱片。只需查看您的代码：

            g.setSelectedRoomNum(comboBox1.getSelectedItem().toString());
            g.setGuestPassportNo(tfPassportNo1.getText());
            g.setGuestName(tfGuestName1.getText());
            g.setGuestPhoneNo(tfPhoneNo1.getText());

            // >>>>>>>>> Nothing here <<<<<<<<<

            g.setSelectedRoomNum(comboBox2.getSelectedItem().toString());
            g.setGuestPassportNo(tfPassportNo2.getText());
            g.setGuestName(tfGuestName2.getText());
            g.setGuestPhoneNo(tfPhoneNo2.getText());

---

在所有这些赋值之后，g有了第2行的数据，第1行的数据就消失了。因此，当插入开始时，g仅具有来自最后一条记录的数据。将字段分配给g后插入行。

您将继续覆盖g的值。请改用集合。警告：。NoFoRoMsStase=＝1不是java中的字符串比较如何工作，你应该使用类似于1.RealSnFoFROMSOSLIDE的东西，你应该考虑使用JTABLE，看看更多细节显示，你能区分第一行和最后一行吗？