mysql 转成double

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

public class MySQLDoubleExample {
    public static void main(String[] args) {
        String url = "jdbc:mysql://localhost:3306/mydatabase";
        String user = "username";
        String password = "password";

        try (Connection conn = DriverManager.getConnection(url, user, password);
             Statement stmt = conn.createStatement();
             ResultSet rs = stmt.executeQuery("SELECT my_double_column FROM my_table")) {

            while (rs.next()) {
                Double myDouble = rs.getDouble("my_double_column");
                System.out.println("Double value: " + myDouble);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}