diff --git a/nuget-publish.bat b/nuget-publish.bat
index e7ce0dc0..1f5cc58e 100644
--- a/nuget-publish.bat
+++ b/nuget-publish.bat
@@ -1,8 +1,8 @@
 :start
 ::定义版本
-set EFCORE2=2.2.0.19
-set EFCORE3=3.2.0.19
-set EFCORE5=5.2.0.19
+set EFCORE2=2.2.0.20-pre1
+set EFCORE3=3.2.0.20-pre1
+set EFCORE5=5.2.0.20-pre1
 
 ::删除所有bin与obj下的文件
 @echo off
diff --git a/samples/Sample.SqlServer/Startup.cs b/samples/Sample.SqlServer/Startup.cs
index 75a2823b..2a2dcb44 100644
--- a/samples/Sample.SqlServer/Startup.cs
+++ b/samples/Sample.SqlServer/Startup.cs
@@ -41,11 +41,11 @@ namespace Sample.SqlServer
                          (conStr,builder) => builder.UseSqlServer(conStr).UseLoggerFactory(efLogger).UseQueryTrackingBehavior(QueryTrackingBehavior.NoTracking)
                              //.ReplaceService<IQueryTranslationPostprocessorFactory,SqlServer2008QueryTranslationPostprocessorFactory>()//支持sqlserver2008r2
                              );//使用链接字符串创建dbcontext
-                     op.UseReadWriteConfiguration(sp => new List<string>()
-                     {
-                         "Data Source=localhost;Initial Catalog=ShardingCoreDB1;Integrated Security=True;",
-                         "Data Source=localhost;Initial Catalog=ShardingCoreDB2;Integrated Security=True;"
-                     }, ReadStrategyEnum.Random);
+                     //op.UseReadWriteConfiguration(sp => new List<string>()
+                     //{
+                     //    "Data Source=localhost;Initial Catalog=ShardingCoreDB1;Integrated Security=True;",
+                     //    "Data Source=localhost;Initial Catalog=ShardingCoreDB2;Integrated Security=True;"
+                     //}, ReadStrategyEnum.Random);
                      op.AddShardingTableRoute<SysUserModVirtualTableRoute>();
                      op.AddShardingTableRoute<SysUserSalaryVirtualTableRoute>();
                  });