Update questdb bulkcopy

Src/Asp.NetCore2/SqlSugar.QuestDb.RestApi/CsvHelperEnumToIntConverter.cs

@@ -0,0 +1,34 @@
+using CsvHelper.Configuration;
+using CsvHelper.TypeConversion;
+using CsvHelper;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace SqlSugar 
+{
+    public class CsvHelperEnumToIntConverter : ITypeConverter
+    {
+        public string ConvertToString(object value, IWriterRow row, MemberMapData memberMapData)
+        {
+            if (value == null) 
+            {
+                return "null";
+            }
+            else if (value is Enum enumValue)
+            {
+                return (Convert.ToInt32(enumValue)).ToString();
+            }
+            throw new NotSupportedException();
+        }
+
+        public object ConvertFromString(string text, IReaderRow row, MemberMapData memberMapData)
+        {
+            if (int.TryParse(text, out int intValue))
+            {
+                return text;
+            }
+            throw new NotSupportedException();
+        }
+    }
+}