如果使用SQLite，需要下载
System.Sqlite, newtonsoft.Json，Sqlsugar

如果使用MySql，则需要newtonsoft.Json，Sqlsugar， MySql.Data 8.18，mysql的连接可以参照 ：https://www.cnblogs.com/ShaYeBlog/p/12667135.html

官方文档：https://www.bookstack.cn/read/SqlSugar-4.x-zh/fb0c2301c8dfe32c.md，可以使用SqlSugar ORM工具箱生成实体类

using SqlSugar;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DAL
{
    public class ActualDataProvider
    {
        public int Delete(ActualData t)
        {
            if (t == null) return 0;
            ActualData model = SqlSugarHelper.db.Queryable<ActualData>().Where(item => item.Id == t.Id).First();
            if (model == null) return 0;

            int count = SqlSugarHelper.db.Deleteable<ActualData>(model).ExecuteCommand();
            return count;
        }

        //public int Insert(ActualData t)
        //{
        //    int count = SqlSugarHelper.db.Insertable<ActualData>(t).ExecuteCommand();
        //    return count;
        //}

        /// <summary>
        /// 批量插入
        /// </summary>
        /// <param name="t"></param>
        /// <returns></returns>
        /// 
        public int Insert(List<ActualData> t)
        {
            if (t == null) return 0;
            if (t.Value == null) return 0;
            方法1
            //foreach (var item in t.ToArray())
            //{
            //    SqlSugarHelper.db.Insertable<ActualData>(item).ExecuteCommand();
            //}
            方法2
            int count = SqlSugarHelper.db.Insertable(t.ToArray()).ExecuteCommand();//官方推荐的
            return count;
        }


        public List<ActualData> Select()
        {
            DateTime day = DateTime.Now.AddDays(-1);
            return SqlSugarHelper.db.Queryable<ActualData>().Where(u => SqlFunc.Between(u.InsertTime, day,DateTime.Now)).ToList();
            //return SqlSugarHelper.db.Queryable<ActualData>().ToList();
        }

        public int Update(ActualData t)
        {
            if (t == null) return 0;
            ActualData model = SqlSugarHelper.db.Queryable<ActualData>().Where(item => item.Id == t.Id).First();
            if (model == null) return 0;
            model.Value = t.Value;
            model.Remark = t.Remark;
            model.VarName = t.VarName;
            int count = SqlSugarHelper.db.Updateable<ActualData>(model).ExecuteCommand();
            return count;
        }
    }
}

using DAL;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace SugarShenhua
{
    public partial class FrmMain : Form
    {
        public FrmMain()
        {
            InitializeComponent();
            SqlSugarService.SetConnectionStr("Data Source=" + Application.StartupPath + str2);
            //WPF
            //SqlSugarService.SetConnectionStr("Data Source=" + System.IO.Directory.GetCurrentDirectory() + str2); 
        }
        //"Data Source=192.168.0.15;Initial Catalog=Sugar;User ID=sa;Password=12345678;Connect Timeout=30;Encrypt=False;TrustServerCertificate=False;ApplicationIntent=ReadWrite;MultiSubnetFailover=False"

        string str2 = "\\Config\\ScadaData.db;Pooling=true;FailIfMissing=false";
        
string ConnectionString = "database='" + "shenhuadata" + "';Data Source = '" + "localhost" + "'; User Id = '" + "root" + "'; pwd='" + "sasa" + "';charset='utf8';pooling=true"; //mySql
        string str3 = "Data Source=.;Initial Catalog=Sugar;User ID=sa;Password=sasa;Connect Timeout=30;Encrypt=False;TrustServerCertificate=False;ApplicationIntent=ReadWrite;MultiSubnetFailover=False";

        private void Add_Click(object sender, EventArgs e)
        {
            var t1 = new ActualData()
            {
                InsertTime = DateTime.Now,
                Remark = "测试Remark1",
                Value = "测试Value1",
                VarName = "测试变量名1"
            };

            var t2 = new ActualData()
            {
                InsertTime = DateTime.Now,
                Remark = "测试Remark2",
                Value = "测试Value2",
                VarName = "测试变量名2"
            };

            var t3 = new ActualData()
            {
                InsertTime = DateTime.Now,
                Remark = "测试Remark3",
                Value = "测试Value3",
                VarName = "测试变量名3"
            };

            List<ActualData> actualDatas = new List<ActualData>();
            actualDatas.Add(t1);
            actualDatas.Add(t2);
            actualDatas.Add(t3);

            ActualDataProvider actProvider = new ActualDataProvider();
            actProvider.Insert(actualDatas);
        }

        private void Select_Click(object sender, EventArgs e)
        {
            ActualDataProvider actProvider = new ActualDataProvider();
            
            Dgv.DataSource= actProvider.Select();
        }

        private void Update_Click(object sender, EventArgs e)
        {
            ActualDataProvider actProvider = new ActualDataProvider();
            var t1 = new ActualData()
            {
                Id = 38,
                InsertTime = DateTime.Now,
                Remark = "插入练习1",
                Value = "插入练习2",
                VarName = "插入练习3"
            };
            int count = actProvider.Update(t1);
        }

        private void Delete_Click(object sender, EventArgs e)
        {
            ActualDataProvider actProvider = new ActualDataProvider();

            var t1 = new ActualData()
            {
                Id = 38,
                InsertTime = DateTime.Now,
                Remark = "插入练习1",
                Value = "插入练习2",
                VarName = "插入练习3"
            };

            int count = actProvider.Delete(t1);
        }
    }
}