Add odbc for .net framework

Src/Asp.Net/SqlSugar.Odbc/GBase/CodeFirst/GBaseCodeFirst.cs

@@ -0,0 +1,40 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+namespace SqlSugar.Odbc
+{
+    public class OdbcCodeFirst:CodeFirstProvider
+    {
+        public virtual bool IsNoTran { get; set; } = true;
+        public override void ExistLogic(EntityInfo entityInfo) 
+        {
+            this.Context.Ado.ExecuteCommand("select '不支持修改表' from dual ");
+        }
+
+        protected override DbColumnInfo EntityColumnToDbColumn(EntityInfo entityInfo, string tableName, EntityColumnInfo item)
+        {
+            var result= base.EntityColumnToDbColumn(entityInfo, tableName, item);
+            if (item.UnderType == UtilConstants.GuidType) 
+            {
+                item.Length = 36;
+            }
+            return result;
+        }
+        protected override string GetTableName(EntityInfo entityInfo)
+        {
+            var table= this.Context.EntityMaintenance.GetTableName(entityInfo.EntityName);
+            var tableArray = table.Split('.');
+            var noFormat = table.Split(']').Length==1;
+            if (tableArray.Length > 1 && noFormat)
+            {
+                var dbMain = new OdbcDbMaintenance() { Context = this.Context };
+                return dbMain.SqlBuilder.GetTranslationTableName(table);
+            }
+            else
+            {
+                return table;
+            }
+        }
+      }
+}