import java.sql.*;
                import java.util.Scanner;
                
                class DatabaseManager {
                    public static void main(String[] args) throws ClassNotFoundException {
                       Class.forName("com.mysql.cj.jdbc.Driver");
                        try {
                            Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/chatTest", "root", "");
                            System.out.println("Connection successfully");
                            Statement st = connection.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_READ_ONLY);
                            ResultSet result = st.executeQuery("select * from chats");
                
                            try{
                                while(result.next()){
                                    System.out.println("Id = "+result.getInt("id")+ ", username = " + result.getString("username") + ", message = " + result.getString("message"));
                                }
                            } catch(NumberFormatException e){
                                System.out.println("Exception: " + e.getMessage());
                            }
                            connection.close();
                        } catch (SQLException e) {
                            System.out.println("SQL Exception: " + e.getMessage());
                        } catch (Exception e){
                            System.out.println("Exception: " + e.getMessage());
                        }
                    }
                }