Java 用户活动ID自动增量

我在从java向mysql中插入值时遇到了问题，它仍然让我对如何插入自动增量感到困惑。有人说，它将自动插入值而不插入值。此外，我还尝试使用addsetint（1，null）并在那里出错

public void mase(){

   String time=dateFormat.format(date);

   String SQLTIME="INSERT INTO history (UserActivityID, UserTimeActivity, UserActivity) VALUES (null,?,?)";

try {
    JOptionPane.showMessageDialog(this, "?");

    Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3306/atm?zeroDateTimeBehavior=convertToNull", "root", "");
    PreparedStatement prstm=con.prepareStatement(SQLTIME);
    prstm = con.prepareStatement(SQLTIME,PreparedStatement.RETURN_GENERATED_KEYS);

    prstm.setString(1, time);
    prstm.setString(2,"Cash Withdraw");
    int rowsInserted = prstm.executeUpdate();
    if (rowsInserted > 0) {

     JOptionPane.showMessageDialog(this," inserted successfully!");
     }

} catch (SQLException | HeadlessException | ClassCastException ex) {
    JOptionPane.showMessageDialog(this, ex); 
}
    JOptionPane.showMessageDialog(this, time); 

---

}

从命令中排除

用户活动ID

，DB管理器将为您插入该ID

String SQLTIME=“插入历史记录（UserTimeActivity，UserActivity）值（？，）”