WebGL连接mysql数据库，以及读取服务器文件的流程

1.1 发布WebAPI作为连接数据库的中转站

（1）创建WebAPI项目，VS2017

（2）WebAPI中主要是Post和Get方法，通过Post传入数据库连接参数和要查询的表名，通过Get方法获取查询内容。

using MySql.Data.MySqlClient;
using System;
using System.Data;
using System.Web.Http;
using WebAPI.Models;
using Newtonsoft.Json;

namespace WebAPI.Controllers
{
    public class InterfaceController : ApiController
    {

        private static string connMysql;
        private static string chartName;
        public void Post(InterfaceValue chart)
        {
            connMysql=chart.Connectsql;
            chartName = chart.ChartsName;
        }
        public string Get()
        {
            DataTable tbl;
            try
            {
                using (MySqlConnection mysqls=new MySqlConnection(connMysql))
                {
                    mysqls.Open();
                    DataSet dataSet = new DataSet();
                    MySqlDataAdapter sqlDataAdapter = new MySqlDataAdapter("select * from " + chartName, mysqls);
                    sqlDataAdapter.Fill(dataSet);
                    tbl = dataSet.Tables[0];
                    mysqls.Close();
                } 
            }
            catch (Exception ex)
            {
                return ex.ToString();
            }
            return JsonConvert.SerializeObject(tbl);
        }
        public static MySqlCommand getSqlCommand(String sql, MySqlConnection mysql)
        {
            MySqlCommand mySqlCommand = new MySqlCommand(sql, mysql);
            return mySqlCommand;
        }

    }
}

namespace WebAPI.Models
{
    public class InterfaceValue
    {
  
        public string Connectsql { get; set; }
        public string ChartsName { get; set; }
      
    }
}

（3）发布  https://www.pianshen.com/article/69931536317/

（4）IIS中配置WebAPI网站

1.2 获取WebGl文件夹下streamingAssets中.json文件内容

  private void Start()
    {

        StartCoroutine(GetData("test.json"));
    }

IEnumerator GetData(string fileName)
    {
        var uri = new System.Uri(Path.Combine(Application.streamingAssetsPath, fileName));
        UnityWebRequest www = UnityWebRequest.Get(uri);
        yield return www.SendWebRequest();

        if (www.isNetworkError || www.isHttpError)
        {
            Debug.Log(www.error);
        }
        else
        {

            //Debug.Log(www.downloadHandler.text);
            string jsonStr = www.downloadHandler.text;
            files = JsonConvert.DeserializeObject<List<string>>(jsonStr);

        }
    }

根据获取到的文本内容得到：1、数据库连接字段connect 2、要查询的表名chartName

1.3 使用Post方法和Get方法连接WebAPI

  private bool arrived=true;

  private  URL = "http://192.XXX.XX.XXX:8081/api/interface";

   IEnumerator SetPost1(string connect)
    {
                   
            while (!arrived)
            {
                yield return new WaitForSeconds(0.01f);
            }
            arrived = false;
            WWWForm form = new WWWForm();
            form.AddField("Connectsql", connect);
            form.AddField("ChartsName",chartName);
            //Post方法
            UnityWebRequest www = UnityWebRequest.Post(URL, form);
            //www.uploadHandler.contentType = "application/json";
            yield return www.SendWebRequest();

            if (www.isNetworkError || www.isHttpError)
            {
                Debug.Log(www.error);
            }
               
               //Get方法
            UnityWebRequest webRequest = UnityWebRequest.Get(URL);
            yield return webRequest.SendWebRequest();

            string[] pages = URL.Split('/');
            int page = pages.Length - 1;
            if (webRequest.isNetworkError)
            {
                Debug.Log(pages[page] + ": Error: " + webRequest.error);
            }
            else
            {
                string dataStr = webRequest.downloadHandler.text.Replace("\\", "");
                dataStr=dataStr.Replace("\"", "");
                //将数据表的字符串结果转化成二维数组dataTable 
                //print("dataStr" + dataStr);
                string[] str = dataStr.Split(':');
                int colIndex=0;
                int rowIndex = 0;
                string[,]  dataTable = new string[int.Parse(rows) , int.Parse(cols)];
                for (int k = 1; k < str.Length; k++)
                {
                    if (str[k].Contains("}"))
                    {
                        dataTable[rowIndex++,colIndex] = str[k].Substring(0, str[k].IndexOf('}'));
                        colIndex = 0;
                    }
                    else
                    {
                        dataTable[rowIndex,colIndex++] = str[k].Substring(0, str[k].IndexOf(','));
                    }
                }
          }
      
    }