Question

我编写了这段代码，将数据插入到tbl_Hotel_Reservation表中..但是它无效！问题是什么？！它可以在插入查询中的valuse部分吗？ person和involved_by是int格式！

    // DO RESERVATION
    DateFormat parser = new SimpleDateFormat("M-dd-yyyy");

    int hotel_id = 0;
    String username = jTextField4.getText();
    String city = jComboBox1.getSelectedItem().toString();
    String hotel_name = jComboBox2.getSelectedItem().toString();

    String start_temp = jDateChooser1.getDate().toString();

    Date start = parser.parse(start_temp);

    String end_temp = jDateChooser2.getDate().toString();

    Date end = parser.parse(end_temp);

    int person = Integer.parseInt(jTextField3.getText());

    try
    {

        Class.forName("com.mysql.jdbc.Driver");

        Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/JEREN","root","");
        Statement stat = con.createStatement();

        String insert = "insert into tbl_Hotel_Reservation (start_date,end_date,number_of_person,arranged_by,involved_by) VALUES ('"+start+"','"+end+"',"+person+",'"+username+"',"+hotel_id+");";

        stat.executeUpdate(insert);

        stat.close();
        con.close();
        JOptionPane.showMessageDialog(null,"Reservation is done Successfully!");

    }
    catch (SQLException | HeadlessException e)
    {
        //e.printStackTrace();
        JOptionPane.showMessageDialog(null,"Error occurred in reservation process");
    } catch (ClassNotFoundException ex) {
        Logger.getLogger(Users.class.getName()).log(Level.SEVERE, null, ex);
    }

Answer 1

Date对象没有格式。 Date对象只是代表某个特定时刻。

您已有Date。为什么要尝试获取toString()值并将其解析回Date？

String start_temp = jDateChooser1.getDate().toString();
Date start = parser.parse(start_temp);

这没有任何意义。

如果您尝试以表格中的文字格式输入Date，只需格式化您拥有的Date对象。

String start_temp = parser.format(jDateChooser1.getDate());

如果您尝试输入Date作为SQL时间戳字段，请使用PreparedStatement和setTime()方法之一。{/ p>

无法将数据插入表格

1 个答案: