.net Core——SqlSugar使用

一、DbContext配置

    public class DbContext
    {
        public DbContext()
        {
            Db = new SqlSugarClient(new ConnectionConfig()
            {
                ConnectionString = "server=120.79.21.96;uid=Test;pwd=Test;database=Test",
                DbType = DbType.MySql,
                InitKeyType = InitKeyType.Attribute,//从特性读取主键和自增列信息
                IsAutoCloseConnection = true,//开启自动释放模式和EF原理一样我就不多解释了
            });
            //调式代码 用来打印SQL
            Db.Aop.OnLogExecuting = (sql, pars) =>
            {
                Console.WriteLine(sql + "\r\n" +
                    Db.Utilities.SerializeObject(pars.ToDictionary(it => it.ParameterName, it => it.Value)));
                Console.WriteLine();
            };
        }
        //注意：不能写成静态的，不能写成静态的
        public SqlSugarClient Db;//用来处理事务多表查询和复杂的操作
    }

二、使用

        public IActionResult GetInit()
        {
            DbContext db = new DbContext();

            List<DbList> a =db.Db.SqlQueryable<DbList>("SELECT a.SubG_ID,a.SubG_GroupName, d.User_Id, d.User_Name, d.User_Avatar FROM SubGroup AS a LEFT JOIN User_SubGroup AS b ON a.SubG_ID = b.SubG_ById INNER JOIN Friend AS c ON b.User_Id = c.Frie_ById INNER JOIN Users AS d ON d.User_Id = c.Frie_ById WHERE c.User_Id = 5  ").ToList();

            string str = "{\"code\":0,\"msg\":\"\",\"data\":{\"mine\":{\"username\":\"纸飞机\",\"id\":\"100000\",\"status\":\"online\",\"sign\":\"在深邃的编码世界，做一枚轻盈的纸飞机\",\"avatar\":\"http://cdn.firstlinkapp.com/upload/2016_6/1465575923433_33812.jpg\"},\"friend\":[{\"groupname\":\"前端码屌\",\"id\":1,\"online\":2,\"list\":[{\"username\":\"贤心\",\"id\":\"100001\",\"avatar\":\"http://tp1.sinaimg.cn/1571889140/180/40030060651/1\",\"sign\":\"这些都是测试数据，实际使用请严格按照该格式返回\"},{\"username\":\"Z_子晴\",\"id\":\"108101\",\"avatar\":\"http://tva3.sinaimg.cn/crop.0.0.512.512.180/8693225ajw8f2rt20ptykj20e80e8weu.jpg\",\"sign\":\"微电商达人\"},{\"username\":\"Lemon_CC\",\"id\":\"102101\",\"avatar\":\"http://tp2.sinaimg.cn/1833062053/180/5643591594/0\",\"sign\":\"\"},{\"username\":\"马小云\",\"id\":\"168168\",\"avatar\":\"http://tp4.sinaimg.cn/2145291155/180/5601307179/1\",\"sign\":\"让天下没有难写的代码\"},{\"username\":\"徐小峥\",\"id\":\"666666\",\"avatar\":\"http://tp2.sinaimg.cn/1783286485/180/5677568891/1\",\"sign\":\"代码在囧途，也要写到底\"}]},{\"groupname\":\"网红\",\"id\":2,\"online\":3,\"list\":[{\"username\":\"罗玉凤\",\"id\":\"121286\",\"avatar\":\"http://tp1.sinaimg.cn/1241679004/180/5743814375/0\",\"sign\":\"在自己实力不济的时候，不要去相信什么媒体和记者。他们不是善良的人，有时候候他们的采访对当事人而言就是陷阱\"},{\"username\":\"长泽梓Azusa\",\"id\":\"100001222\",\"sign\":\"我是日本女艺人长泽あずさ\",\"avatar\":\"http://tva1.sinaimg.cn/crop.0.0.180.180.180/86b15b6cjw1e8qgp5bmzyj2050050aa8.jpg\"},{\"username\":\"大鱼_MsYuyu\",\"id\":\"12123454\",\"avatar\":\"http://tp1.sinaimg.cn/5286730964/50/5745125631/0\",\"sign\":\"我瘋了！這也太準了吧  超級笑點低\"},{\"username\":\"谢楠\",\"id\":\"10034001\",\"avatar\":\"http://tp4.sinaimg.cn/1665074831/180/5617130952/0\",\"sign\":\"\"},{\"username\":\"柏雪近在它香\",\"id\":\"3435343\",\"avatar\":\"http://tp2.sinaimg.cn/2518326245/180/5636099025/0\",\"sign\":\"\"}]},{\"groupname\":\"我心中的女神\",\"id\":3,\"online\":1,\"list\":[{\"username\":\"林心如\",\"id\":\"76543\",\"avatar\":\"http://tp3.sinaimg.cn/1223762662/180/5741707953/0\",\"sign\":\"我爱贤心\"},{\"username\":\"佟丽娅\",\"id\":\"4803920\",\"avatar\":\"http://tp4.sinaimg.cn/1345566427/180/5730976522/0\",\"sign\":\"我也爱贤心吖吖啊\"}]}],\"group\":[{\"groupname\":\"前端群\",\"id\":\"101\",\"avatar\":\"http://tp2.sinaimg.cn/2211874245/180/40050524279/0\"},{\"groupname\":\"Fly社区官方群\",\"id\":\"102\",\"avatar\":\"http://tp2.sinaimg.cn/5488749285/50/5719808192/1\"}]}}";
            var result = JsonConvert.DeserializeObject(str);
            //List<string> dic = ChatHub.GetOnlineUserIds();

            return Json(result);
        }