From 73008f2ac8cc74e947483308eb06902ac8ccaf94 Mon Sep 17 00:00:00 2001
From: xuejiaming <326308290@qq.com>
Date: Sat, 21 Aug 2021 09:10:52 +0800
Subject: [PATCH] 1

---
 README.md                                        | 16 ++++++++++++++++
 .../Controllers/ValuesController.cs              |  1 +
 2 files changed, 17 insertions(+)

diff --git a/README.md b/README.md
index c4249929..835d0175 100644
--- a/README.md
+++ b/README.md
@@ -356,6 +356,22 @@ AbstractSimpleShardingYearKeyLongVirtualTableRoute |按时间戳 |yyyy | `>,>=,<
             //         op.AddShardingTableRoute<SysUserModVirtualTableRoute>();
             //     });
 ```
+如果数据库不支持mars但是我又要支持追踪该怎么办
+```c#
+
+            var sresult =  _defaultTableDbContext.Set<SysUserMod>().ToList();
+
+            var sysUserMod98 = result.FirstOrDefault(o => o.Id == "98");
+            _defaultTableDbContext.Attach(sysUserMod98);
+            sysUserMod98.Name = "name_update"+new Random().Next(1,99)+"_98";
+            await _defaultTableDbContext.SaveChangesAsync();
+--log info
+     info: Microsoft.EntityFrameworkCore.Database.Command[20101]
+      Executed DbCommand (0ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
+      SELECT COUNT(*)
+      FROM [SysUserMod_01] AS [s]
+      WHERE [s].[Age] <= 10
+```
 
 
 # 计划
diff --git a/samples/Sample.SqlServer/Controllers/ValuesController.cs b/samples/Sample.SqlServer/Controllers/ValuesController.cs
index 1f9b240a..d77c412f 100644
--- a/samples/Sample.SqlServer/Controllers/ValuesController.cs
+++ b/samples/Sample.SqlServer/Controllers/ValuesController.cs
@@ -49,6 +49,7 @@ namespace Sample.SqlServer.Controllers
             var sresult =  _defaultTableDbContext.Set<SysUserMod>().ToList();
 
             var sysUserMod98 = result.FirstOrDefault(o => o.Id == "98");
+            _defaultTableDbContext.Attach(sysUserMod98);
             sysUserMod98.Name = "name_update"+new Random().Next(1,99)+"_98";
             await _defaultTableDbContext.SaveChangesAsync();
             return Ok(result);