diff --git a/Examples/base_entity/BaseEntity.cs b/Examples/base_entity/BaseEntity.cs
index 34eca502..018c7d58 100644
--- a/Examples/base_entity/BaseEntity.cs
+++ b/Examples/base_entity/BaseEntity.cs
@@ -13,7 +13,11 @@ public abstract class BaseEntity
         var orm = new FreeSqlBuilder()
             .UseAutoSyncStructure(true)
             .UseNoneCommandParameter(true)
-            .UseConnectionString(DataType.Sqlite, "data source=test.db;max pool size=5")
+            .UseConnectionString(DataType.Sqlite, "data source=test.db;max pool size=2")
+            //.UseConnectionString(FreeSql.DataType.MySql, "Data Source=127.0.0.1;Port=3306;User ID=root;Password=root;Initial Catalog=cccddd;Charset=utf8;SslMode=none;Max pool size=2")
+            //.UseConnectionString(FreeSql.DataType.PostgreSQL, "Host=192.168.164.10;Port=5432;Username=postgres;Password=123456;Database=tedb;Pooling=true;Maximum Pool Size=2")
+            //.UseConnectionString(FreeSql.DataType.SqlServer, "Data Source=.;Integrated Security=True;Initial Catalog=freesqlTest;Pooling=true;Max Pool Size=2")
+            //.UseConnectionString(FreeSql.DataType.Oracle, "user id=user1;password=123456;data source=//127.0.0.1:1521/XE;Pooling=true;Max Pool Size=2")
             .Build();
         orm.Aop.CurdBefore += (s, e) => Trace.WriteLine(e.Sql + "\r\n");
         return orm;
diff --git a/Examples/base_entity/base_entity.csproj b/Examples/base_entity/base_entity.csproj
index 63acf723..f5ecc34b 100644
--- a/Examples/base_entity/base_entity.csproj
+++ b/Examples/base_entity/base_entity.csproj
@@ -12,7 +12,11 @@
   <ItemGroup>
     <ProjectReference Include="..\..\FreeSql.Repository\FreeSql.Repository.csproj" />
     <ProjectReference Include="..\..\FreeSql\FreeSql.csproj" />
+    <ProjectReference Include="..\..\Providers\FreeSql.Provider.MySql\FreeSql.Provider.MySql.csproj" />
+    <ProjectReference Include="..\..\Providers\FreeSql.Provider.Oracle\FreeSql.Provider.Oracle.csproj" />
+    <ProjectReference Include="..\..\Providers\FreeSql.Provider.PostgreSQL\FreeSql.Provider.PostgreSQL.csproj" />
     <ProjectReference Include="..\..\Providers\FreeSql.Provider.Sqlite\FreeSql.Provider.Sqlite.csproj" />
+    <ProjectReference Include="..\..\Providers\FreeSql.Provider.SqlServer\FreeSql.Provider.SqlServer.csproj" />
   </ItemGroup>
 
 </Project>