public class PrimaryKey {
    
    static String user = "user";
    static String pass = "password";
    static String host = "localhost";
    static String db = "Personal";
    static String table = "Angestellte";

    public static void main(String[] args) {
        String url = "jdbc:mysql://" + host + "/" + db;
        getKeys(url);
    }
    
    public static void getKeys(String url) {
        try(Connection connection = DriverManager
                .getConnection(url, user, pass)) {
            Class.forName("com.mysql.cj.jdbc.Driver");
            DatabaseMetaData dbmd = connection.getMetaData();
            ResultSet rs = dbmd.getPrimaryKeys(null, null, table);
            if (rs.next()) {
                do {
                System.out.println("Primary Key Name: " + rs.getString(6)
                        + ", Primary Key Nummer: " + rs.getString(5)
                        + ", Column: " + rs.getString(4));
                }while(rs.next());
            }else {
                System.out.println("No keys found");
            }
        } catch (SQLException e) {
            System.out.println("Fehler bei Tabellenabfrage: " + e);
            return;
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }
}