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ef core 读取text类型慢_ef core读取大字符串字段慢

2022-07-29 07:17:00 【天马3798】

一、ef core 读取text类型慢_ef core读取大字符串字段慢

分析：

当服务器配置低，text富文本字符串比较大超过100kb的时候，使用ef读取数据明显变慢。

变慢的两大使用特点：

1.text 类型富文本字段内容太长，100kb以上

2.读取时候还关联了其他表的数据。

此两种特点，导致ef core读取数据慢，慢的明显。

解决方案：

业务方案：

建议text字段不要存入太大的字符；再客户编辑富文本时候，复制粘贴后去掉样式，重新排版。

业务方案优先考虑，如果确实字段需要内容大，再考虑下方技术方案。

技术方案：

1.列表读取内容过滤掉text的字段，不从数据读取大文本

2.详情读取内容，将关联表数据和text的字段分开查询或者，拆分成2个接口。

二、ef core大文本字段列表读取优化

优化之前：

    var list = query.Include(q => q.Sch_Label).Include(q => q.Sch_Month).Skip(skip)
                .Take(10)
                .ToList()
                .Select(q => new
                {
                    q.ID,
                    q.Name,
                    q.Logo,
                    q.ViewCount,
                    q.CreateTime,
                    AreaShow = q.GetAreaShow(),
                    MonthShow = q.GetMonthShow(),
                    LabelList = q.Sch_Label
                }).ToList();

优化之后：

  var list = query
                .Include(q => q.Sch_Label)
                .Include(q => q.Sch_Month).Skip(skip)
                .Select(q => new School() {
                    ID = q.ID,
                    Name = q.Name,
                    ViewCount = q.ViewCount,
                    CreateTime = q.CreateTime,
                    Logo = q.Logo,
                    Sch_Month = q.Sch_Month,
                    Sch_Label = q.Sch_Label
                })
                .Take(10)
                .ToList()
                .Select(q => new
                {
                    q.ID,
                    q.Name,
                    q.Logo,
                    q.ViewCount,
                    q.CreateTime,
                    AreaShow = q.GetAreaShow(),
                    MonthShow = q.GetMonthShow(),
                    LabelList = q.Sch_Label
                }).ToList();

性能提升相当明显。

三、ef core大文本字段详情读取优化

关联表和 text大文本字段，分开获取；性能提升明显。

优化之前：

        //获取详情
        public IActionResult GetDetail(int id)
        {
            var model = _school.GetQueryable().Where(q => q.ID == id)
                .Include(q => q.Sch_Image)
                .Include(q => q.Sch_Label)
                .Include(q => q.Sch_Month)
                .FirstOrDefault();

            JObject obj = JObject.FromObject(model, MvcContext.GetJsonSerializer());
            //学校视频
            VideoOperate _video = new VideoOperate();
            var videoList = _video.GetBySchool(id, 8).Select(q => new
            {
                q.ID,
                q.Title,
                q.ImgUrl,
                q.ViewCount
            });
            obj.Add("videoList", JArray.FromObject(videoList, MvcContext.GetJsonSerializer()));

            //流量++
            model.ViewCount++;
            _school.Modify(model);
            return Json(obj);
        }

优化之后：

        //获取详情
        public IActionResult GetDetail(int id)
        {
            var model = _school.GetQueryable().Where(q => q.ID == id)
                //.Include(q => q.Sch_Image)
                //.Include(q => q.Sch_Label)
                //.Include(q => q.Sch_Month)
                .FirstOrDefault();

            //JObject obj = JObject.FromObject(model.Result, MvcContext.GetJsonSerializer());
            //学校视频
            //VideoOperate _video = new VideoOperate();
            //var videoList = _video.GetBySchool(id, 8).Select(q => new
            //{
            //    q.ID,
            //    q.Title,
            //    q.ImgUrl,
            //    q.ViewCount
            //});
            //obj.Add("videoList", JArray.FromObject(videoList, MvcContext.GetJsonSerializer()));

            //流量++
            model.ViewCount++;
            _school.Modify(model);
            //return Json(obj);
            return Json(model);
        }
        //获取关联表资料
        public IActionResult GetDetailMore(int id)
        {
            VideoOperate _video = new VideoOperate();
            Sch_ImageOperate _img = new Sch_ImageOperate();
            //学校图片
            var Sch_Image = _img.GetQueryable().Where(q => q.SchID == id).OrderByDescending(q => q.Sort).ToList();
            //学校标签
            var Sch_Label = _img.Context.Sch_Label.Where(q => q.SchID == id).ToList();
            //学校月份
            var Sch_Month = _img.Context.Sch_Month.Where(q => q.SchID == id).ToList();
            //学校视频
            var videoList = _video.GetBySchool(id, 8).Select(q => new
            {
                q.ID,
                q.Title,
                q.ImgUrl,
                q.ViewCount
            });
            return Json(new
            {
                Sch_Image,
                Sch_Label,
                Sch_Month,
                videoList
            });
        }