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    public class JdShopDetailSpider : EntitySpiderBuilder    {        protected override EntitySpider GetEntitySpider()        {            var context = new EntitySpider(new Site())            {                TaskGroup = "JD SKU Weekly",                Identity = "JD Shop details " + DateTimeUtils.MondayRunId,                CachedSize = 1,                ThreadNum = 8,                Downloader = new HttpClientDownloader                {                    DownloadCompleteHandlers = new IDownloadCompleteHandler[]                    {                        new SubContentHandler                        {                            Start = "json(",                            End = ");",                            StartOffset = 5,                            EndOffset = 0                        }                    }                },                PrepareStartUrls = new PrepareStartUrls[]                {                    new BaseDbPrepareStartUrls()                    {                        Source = DataSource.MySql,                        ConnectString = "Database='test';Data Source= localhost;User ID=root;Password=1qazZAQ!;Port=3306",                        QueryString = $"SELECT * FROM jd.sku_v2_{DateTimeUtils.MondayRunId} WHERE shopname is null or shopid is null order by sku",                        Columns = new [] {new DataColumn { Name = "sku"} },                        FormateStrings = new List<string> { "http://chat1.jd.com/api/checkChat?my=list&pidList={0}&callback=json" }                    }                }            };            context.AddEntityPipeline(new MySqlEntityPipeline            {                ConnectString = "Database='taobao';Data Source=localhost ;User ID=root;Password=1qazZAQ!;Port=4306",                Mode = PipelineMode.Update            });            context.AddEntityType(typeof(ProductUpdater), new TargetUrlExtractor            {                Region = new Selector { Type = SelectorType.XPath, Expression = "http://*[@id=\"J_bottomPage\"]" },                Patterns = new List<string> { @"&page=[0-9]+&" }            });            return context;        }        [Schema("jd", "sku_v2", TableSuffix.Monday)]        [EntitySelector(Expression = "$.[*]", Type = SelectorType.JsonPath)]        [Indexes(Primary = "sku")]        public class ProductUpdater : ISpiderEntity        {            [StoredAs("sku", DataType.String, 25)]            [PropertySelector(Expression = "$.pid", Type = SelectorType.JsonPath)]            public string Sku { get; set; }            [StoredAs("shopname", DataType.String, 100)]            [PropertySelector(Expression = "$.seller", Type = SelectorType.JsonPath)]            public string ShopName { get; set; }            [StoredAs("shopid", DataType.String, 25)]            [PropertySelector(Expression = "$.shopId", Type = SelectorType.JsonPath)]            public string ShopId { get; set; }        }    }