diff --git a/samples/Sample.MySql/Controllers/WeatherForecastController.cs b/samples/Sample.MySql/Controllers/WeatherForecastController.cs
index 59005d92..5d437904 100644
--- a/samples/Sample.MySql/Controllers/WeatherForecastController.cs
+++ b/samples/Sample.MySql/Controllers/WeatherForecastController.cs
@@ -6,6 +6,7 @@ using Sample.MySql.multi;
 using Sample.MySql.Shardings;
 using ShardingCore.Core.RuntimeContexts;
 using ShardingCore.Core.VirtualRoutes.TableRoutes.Abstractions;
+using ShardingCore.Helpers;
 
 namespace Sample.MySql.Controllers
 {
@@ -57,7 +58,7 @@ namespace Sample.MySql.Controllers
             // Console.WriteLine("------------");
             // using (var tran = _defaultTableDbContext.Database.BeginTransaction())
             // {
-            var sysUserMods = _defaultTableDbContext.Set<SysUserMod>().OrderBy(o=>o.Id).ThenBy(o=>o.Name);
+            var firstOrDefault = _defaultTableDbContext.Set<SysUserMod>().FromSqlRaw($"select * from {nameof(SysUserMod)}").FirstOrDefault();
 
             var sysUserMods1 = _defaultTableDbContext.Set<SysTest>()
                 .Select(o => new ssss(){ Id = o.Id, C = GetAll().Count(x => x.Id == o.Id) }).ToList();
diff --git a/src/ShardingCore/Helpers/DynamicShardingHelper.cs b/src/ShardingCore/Helpers/DynamicShardingHelper.cs
index c803b808..ccb9ecb5 100644
--- a/src/ShardingCore/Helpers/DynamicShardingHelper.cs
+++ b/src/ShardingCore/Helpers/DynamicShardingHelper.cs
@@ -7,7 +7,6 @@ using System.Threading.Tasks;
 using Microsoft.EntityFrameworkCore;
 using ShardingCore.Core.DbContextCreator;
 using ShardingCore.Core.RuntimeContexts;
-using ShardingCore.Core.ShardingMigrations.Abstractions;
 using ShardingCore.Core.VirtualDatabase.VirtualDataSources.PhysicDataSources;
 using ShardingCore.EFCores;
 using ShardingCore.Exceptions;
@@ -36,8 +35,11 @@ namespace ShardingCore.Helpers
         {
             var virtualDataSource = shardingRuntimeContext.GetVirtualDataSource();
             virtualDataSource.AddPhysicDataSource(new DefaultPhysicDataSource(dataSourceName, connectionString, false));
-            var dataSourceInitializer = shardingRuntimeContext.GetDataSourceInitializer();
-            dataSourceInitializer.InitConfigure(dataSourceName,createDatabase,createTable);
+            if (createDatabase || createTable)
+            {
+                var dataSourceInitializer = shardingRuntimeContext.GetDataSourceInitializer();
+                dataSourceInitializer.InitConfigure(dataSourceName,createDatabase,createTable);
+            }
         }
         /// <summary>
         /// 动态添加数据源
@@ -47,8 +49,7 @@ namespace ShardingCore.Helpers
         /// <param name="connectionString"></param>
         public static void DynamicAppendDataSourceOnly(IShardingRuntimeContext shardingRuntimeContext, string dataSourceName, string connectionString)
         {
-            var virtualDataSource = shardingRuntimeContext.GetVirtualDataSource();
-            virtualDataSource.AddPhysicDataSource(new DefaultPhysicDataSource(dataSourceName, connectionString, false));
+            DynamicAppendDataSource(shardingRuntimeContext, dataSourceName, connectionString, false, false);
         }
 
         public static async Task DynamicMigrateWithDataSourcesAsync(IShardingRuntimeContext shardingRuntimeContext,