JAVA JDBC:为ID列生成的键在表记录中返回null

我不熟悉Java,尤其是JDBC。我正在尝试为GUI开发一个简单的DAO实现,在其中填写面板中的字段,并将数据存储在名为EventList的Oracle DB表中。目前,它适用于类Event(Model)的所有字段,但EventID列除外。

我试图通过语句生成的键生成一个自动递增整数,但是,尽管我尝试了不同的方法来重新组织saveData2()方法中的“INSERT”查询,但记录仍然为空,并且没有生成键。我做错了什么?每一个提示都将不胜感激!

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;

public class EventDAOImpl implements EventDAO {

    @Override
    public void saveData2(Event event) {
        OracleDsSingleton ora =   OracleDsSingleton.getInstance();
        int primKey = 0;
        try {
            Connection connection = ora.getConnection();
            String addQuery = "INSERT INTO EventList(EventName, EventPlace, EventDate, EventDescription, EventCategory) VALUES (?,?,?,?,?)";
            //PreparedStatement ptmt = connection.prepareStatement(addQuery, Statement.RETURN_GENERATED_KEYS); 
//          ResultSet generatedKey = ptmt.getGeneratedKeys();
//                      if (generatedKey.next()) {
//              int key = generatedKey.getInt(1);
//              System.out.println(key);
//            }
            String columnNames [] = new String [] {"EventId"};
            
            PreparedStatement ptmt = connection.prepareStatement(addQuery, columnNames);
            
            ptmt.setString(1, event.getName());
            ptmt.setString(2, event.getPlace());
            ptmt.setString(3, event.getDate());
            ptmt.setString(4, event.getDescription());
            ptmt.setString(5, event.getCategory());
            
            //ptmt.executeUpdate();
                        
            if(ptmt.executeUpdate() > 0) {
                java.sql.ResultSet generatedKey = ptmt.getGeneratedKeys();
                if (generatedKey.next() ) {
                    event.setEventID(generatedKey.getInt(1));
                }
            }
            System.out.println("Data successfully added!");
            //System.out.println("Table updated with EventID = " + primKey);
            System.out.println(event.getName());
            
            
        } catch (SQLException e) {
            e.printStackTrace();
        }
        
    }
}