Unity connects to MySQL and reads table data implementation code

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using MySql.Data.MySqlClient;
using System.Data;
using System;

public class getGameUserAccount : MonoBehaviour
{
    // Start is called before the first frame update
    void Start()
    {
        mySqlCon();
    }

    // Update is called once per frame
    void Update()
    {
        
    }

    public void mySqlCon()
    {
        //Database login data string conStr = "server=localhost;User Id = root;password=123456;Database=gamerdata;charset=utf8";

        //Establish connection //Call MySqlConnection while instantiating, pass in parameters //I personally think the parameters here are directly input in CMD, the string format is directly similar to typing it into cmd MySqlConnection myCon = new MySqlConnection(conStr);

        //Open the connection myCon.Open();

        //Insert data, where useraccount is the table name and the table format is in brackets/*
        //The comment here is because you cannot add values ​​with the same primary key MySqlCommand myCmd = new MySqlCommand("insert into useraccount(id,nickname,password) values ​​(4,'list','testList')", myCon);
        if (myCmd.ExecuteNonQuery() > 0)
        {
            Debug.Log("Query Success!");
        }
        */

        //Query data string selStr = "select * from useraccount";
        MySqlCommand mySelect = new MySqlCommand(selStr, myCon);

        DataSet ds = new DataSet();

        try
        {
            MySqlDataAdapter da = new MySqlDataAdapter(selStr, myCon);
            da.Fill(ds);
            
            Debug.Log(ds.Tables[0].Rows[0][0]);
            Debug.Log(ds.Tables[0].Rows[0][1]);
            Debug.Log(ds.Tables[0].Rows[0][2]);
            Debug.Log(ds.Tables[0].Rows[0][3]);

            //Table[0].Rows[0][0]
            Debug.Log("Query Success!");
        }
        catch (Exception e)
        {
            throw new Exception("SQL:" + selStr + "\n" + e.Message.ToString());
        }

        myCon.Close();
    }
}