mysql的update

package test;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;

public class update {
    public static void main(String[] args) {
        try {
            Class.forName("com.mysql.jdbc.Driver");
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        String sql="update hero set name=?,damage=?,hp=? where id=?";
        try (Connection c= DriverManager.getConnection("jdbc:mysql://localhost:3306/how2java?characterEncoding=utf-8",
                "root","123456"); PreparedStatement ps=c.prepareStatement(sql);){
            ps.setString(1,"哪吒");
            ps.setFloat(3,5000f);
            ps.setInt(2,3000);
            ps.setInt(4,14);
            ps.execute();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}