我怎样才能修复eclips运行时错误

Question

正在加载课程com.mysql.jdbc.Driver'. This is deprecated. The new driver class is com.mysql.cj.jdbc.Driver'。驱动程序通过SPI自动注册，通常不需要手动加载驱动程序类。 java.sql.SQLException：无法使用executeQuery（）发出数据操作语句。 我可以在数据库中添加数据，但我无法更新数据。我该如何修复这个错误。这是我第一次做java项目。我无法解决此错误。

<form  name="myForm" action= "addServlet" method="post">

           <table id="table1" >

                    <tr>
                        <th><b>Email  &nbsp;&nbsp;&nbsp;&nbsp;</b></th>
                        <th><input id="text1" type="text" name="email" ></th>
                    </tr>

                    <tr>
                        <th><b>Email Password &nbsp;&nbsp;&nbsp;&nbsp; </b></th>
                        <th><input id="text1" type="text" name="ePassword" ></th>
                    </tr>

                    <tr>
                        <th><b>Name &nbsp;&nbsp;&nbsp;&nbsp;</b></th>
                        <th><input id="text1" type="text" name="name" ></th>
                    </tr>

                    <tr>
                        <th><b>Country &nbsp;&nbsp;&nbsp;&nbsp; </b></th>
                        <th><input id="text1" type="text" name="country" ></th>
                    </tr>

                    <tr>
                        <th><b>Location  &nbsp;&nbsp;&nbsp;&nbsp;</b></th>
                        <th><input id="text1" type="text" name="location" ></th>
                    </tr>
                    <tr>
                        <th>Gender</th>
                        <th><input type="radio" name="gender" value="male"checked="checked" tabindex="1" /> Male<input type="radio" name="gender" value="female"tabindex="2" /> Female</th>
                    </tr>
                </table>
                <table style="margin-left:700px">
                    <tr>
                        <th><button style="margin-right:50px" name="action" type="Reset" VALUE="Reset">Reset</th>
                        <th><button style="margin-right:50px" name="action" type="Add" VALUE="AddServlet">Add</button></th>
                        <th><button style="margin-right:50px" name="action" type="Update" VALUE="UpdateServlet">Update</button></th>        
                    </tr>
                </table>        
   </from>

public class Update {

    public static boolean connectUserTable(String email,String name,String ePassword,String location,String country,String gender)throws SQLException, ClassNotFoundException{
        boolean status=false; 
        try{
            ResultSet resultSet = null;
            dbConnection db = new dbConnection();
            Connection conn = db.getConnection(); 
            PreparedStatement st = conn.prepareStatement("UPDATE  user set ePassword=?, name=?, location=?, country=?, gender=? WHERE  email=?");
            st.setString(1, email);
            st.setString(2, ePassword);
            st.setString(3, name);
            st.setString(4, location);
            st.setString(5, country);
            st.setString(6, gender);
            resultSet = st.executeQuery();
            while(resultSet.next()){
                resultSet.getString("email");
                resultSet.getString("ePassword");
                resultSet.getString("name");
                resultSet.getString("location");
                resultSet.getString("country");
                resultSet.getString("gender");  
            }

            ResultSet rs=st.executeQuery();  
            status=rs.next();  
        }catch(Exception e){
            System.out.println(e);
        }  
        return status;
    }
}

@WebServlet("/addServlet")
public class addServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;


    public addServlet() {
        super();

    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        PrintWriter out = response.getWriter();
        try {   

            response.setContentType("text/html");
            String email= request.getParameter("email");
            String ePassword = request.getParameter("ePassword");
            String name = request.getParameter("name");
            String location = request.getParameter("location");
            String country = request.getParameter("country");
            String gender = request.getParameter("gender");
            String action = request.getParameter("action");

            if("AddServlet".equals(action)){
                dbConnection db = new dbConnection();
                Connection conn = db.getConnection();
                Statement st = conn.createStatement();
                st.executeUpdate("Insert into user (email,ePassword,name,location,country,gender) values('"+email+"','"+ePassword+"','"+name+"','"+location+"','"+country+"','"+gender+"')");
                response.sendRedirect("MainPage.jsp");
            }
            if("UpdateServlet".equals(action)){
                response.setContentType("text/html");
                if(Update.connectUserTable(email, name, ePassword, location, country, gender)){
                    RequestDispatcher rd=request.getRequestDispatcher("MainPage.jsp");  
                    rd.include(request,response);   
                }
                else{
                    RequestDispatcher rd=request.getRequestDispatcher("UserRegister.jsp");  
                    rd.include(request,response);  
                }   
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {

            e.printStackTrace();
        }
        out.close(); 
    }

}

public class dbConnection {
    public Connection getConnection(){
        try{
            Class.forName("com.mysql.jdbc.Driver");
            Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/oop?useSSL=false","root","");

            return conn;
        }catch(ClassNotFoundException e){
            e.printStackTrace();
            return null;
        }catch(SQLException e){
            e.printStackTrace();
            return null;    
        }

    }
}