简单体验一个高性能，简单，轻量的ORM库- Dapper (无依赖其它库，非常方便高效)

步骤1)引入该ORM库。

使用Nuget搜索"Dapper"安装或者直接从github上下载源码  (https://github.com/StackExchange/Dapper) 集成到项目中。

步骤2)初始化数据库连接配置.

using MySql.Data.MySqlClient;
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Text;

namespace CoreLab.DAL.Base
{
    /// <summary>
    /// 功能简介：基于Dapper这个orm框架的数据库访问对象
    /// 创建时间：2020-8-11
    /// 创建人：ww
    /// </summary>
    public class DBaseForDapper
    {
        public static IDbConnection dbConnect_GmUser
        {
            get
            {
                return new MySqlConnection(SqlConnectManager.Instance.SqlConnectStr_Gateway);//SqlConnection默认是Sqlserver的,他们都实现了IDbConnnection
            }
        }
    }
}

步骤3)从简单的CRUD来体验Dapper( 由于仅用于体验用法，因此直接写在controller中了).

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using CoreLab.Model.ListPageModel;
using CoreLab.Model.Configs;
using Microsoft.Extensions.Options;
using Microsoft.AspNetCore.Http;
using System.Net.Http.Headers;
using System.IO;
using Microsoft.AspNetCore.Hosting;using Newtonsoft.Json;using System.Text;
using CoreLab.DAL;
using CoreLab.DAL.Base;
using Dapper;
using System.Data;namespace CoreLab.Web.Controllers
{
    /// <summary>
    /// 功能简介：本控制器内的代码仅用于快速测试.
    /// 创建时间：2020-8-11
    /// 创建人：ww
    /// </summary>
    public class DemoController : BaseController
    { 
        public string DapperTest_Add(string CardTypeId,string CardTypeName)
        {
            try
            {
                E_CardType eCardType = new E_CardType() { CardTypeId = CardTypeId, CardTypeName = CardTypeName, CreateTime = DateTime.Now, EnableStatus = 1 };
                using (IDbConnection dbConnection = DBaseForDapper.dbConnect_GmUser)
                {
                    int iReturn = dbConnection.Execute("insert into tb_cardtype(CardTypeId,CardTypeName,EnableStatus) values(@CardTypeId,@CardTypeName,@EnableStatus)", eCardType);
                    return iReturn.ToString();
                }
            }
            catch(Exception ex)
            {

            }
            return "-1";
        }
        public IActionResult DapperTest_QueryList()
        {
            try
            {
                using (IDbConnection dbConnection = DBaseForDapper.dbConnect_GmUser)
                {
                    IList<E_CardType> listCardType = dbConnection.Query<E_CardType>("select * from tb_cardtype",null).ToList();
                    return new JsonResult(listCardType);
                }
            }
            catch (Exception ex)
            {

            }
            return new JsonResult(null);
        }
        public IActionResult DapperTest_QueryEntity(string CardTypeId)
        {
            try
            {
                using (IDbConnection dbConnection = DBaseForDapper.dbConnect_GmUser)
                {
                    //如果是in  @ids 则对应一个数组而不是对象。
                    IEnumerable<E_CardType> listCardType = dbConnection.Query<E_CardType>("select * from tb_cardtype where CardTypeId=@CardTypeId", new E_CardType() {  CardTypeId= CardTypeId });
                    if (listCardType != null && listCardType.Count() > 0)
                    {
                        return new JsonResult(listCardType.First());
                    }
                    return  new JsonResult(null);
                }
            }
            catch (Exception ex)
            {

            }
            return new JsonResult(null);
        }
        public string DapperTest_Update(string CardTypeId, int EnableStatus)
        {
            try
            {
                using (IDbConnection dbConnection = DBaseForDapper.dbConnect_GmUser)
                {
                    int iReturn = dbConnection.Execute($"update tb_cardtype set EnableStatus={EnableStatus} where CardTypeId=@CardTypeId",
                        new E_CardType() { CardTypeId=CardTypeId });
                    return iReturn.ToString();
                }
            }
            catch (Exception ex)
            {

            }
            return "-1";
        }

        public string DapperTest_Delete(string CardTypeId)
        {
            try
            {
                using (IDbConnection dbConnection = DBaseForDapper.dbConnect_GmUser)
                {
                    int iReturn = dbConnection.Execute($"delete from tb_cardtype  where CardTypeId=@CardTypeId",
                        new E_CardType() { CardTypeId = CardTypeId });
                    return iReturn.ToString();
                }
            }
            catch (Exception ex)
            {

            }
            return "-1";
        }
    }
    /// <summary>
    /// 游戏卡类型
    /// </summary>
    public class E_CardType
    {
        public string CardTypeId { get; set; }
        public string CardTypeName { get; set; }
        public DateTime CreateTime { get; set; }
        public int EnableStatus { get; set; }
    }
}