diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 6e9c776..eedd6eb 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -1,12 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="ChangeListManager">
-    <list default="true" id="b2aca021-ff30-4cbf-8dc9-8cdd4f4c39dc" name="Default Changelist" comment="">
-      <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/application.go" beforeDir="false" afterPath="$PROJECT_DIR$/application.go" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/cache_db.go" beforeDir="false" afterPath="$PROJECT_DIR$/cache_db.go" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/db.go" beforeDir="false" afterPath="$PROJECT_DIR$/db.go" afterDir="false" />
-    </list>
+    <list default="true" id="b2aca021-ff30-4cbf-8dc9-8cdd4f4c39dc" name="Default Changelist" comment="" />
     <option name="EXCLUDED_CONVERTED_TO_IGNORED" value="true" />
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
@@ -73,7 +68,7 @@
       <option name="presentableId" value="Default" />
       <updated>1573372557346</updated>
       <workItem from="1573372558521" duration="18000" />
-      <workItem from="1573372583551" duration="5432000" />
+      <workItem from="1573372583551" duration="5522000" />
     </task>
     <task id="LOCAL-00001" summary="清理">
       <created>1573372845218</created>
@@ -110,7 +105,14 @@
       <option name="project" value="LOCAL" />
       <updated>1573375887561</updated>
     </task>
-    <option name="localTasksCounter" value="6" />
+    <task id="LOCAL-00006" summary="数据库缓存">
+      <created>1573380045254</created>
+      <option name="number" value="00006" />
+      <option name="presentableId" value="LOCAL-00006" />
+      <option name="project" value="LOCAL" />
+      <updated>1573380045254</updated>
+    </task>
+    <option name="localTasksCounter" value="7" />
     <servers />
   </component>
   <component name="TypeScriptGeneratedFilesManager">
@@ -132,6 +134,7 @@
   <component name="VcsManagerConfiguration">
     <MESSAGE value="清理" />
     <MESSAGE value="自动设置数据库" />
-    <option name="LAST_COMMIT_MESSAGE" value="自动设置数据库" />
+    <MESSAGE value="数据库缓存" />
+    <option name="LAST_COMMIT_MESSAGE" value="数据库缓存" />
   </component>
 </project>
\ No newline at end of file
diff --git a/application.go b/application.go
index c0d0480..604cfe6 100644
--- a/application.go
+++ b/application.go
@@ -163,8 +163,9 @@ func (this *Application) SetSession(short CacheIns, Long CacheIns) {
 //默认配置缓存和session实现
 func (this *Application) SetDefault(connect func(err ...*Error) *sql.DB) {
 	this.SetConfig()
-	this.connectDbFunc = connect
-	if this.connectDbFunc != nil {
+
+	if connect != nil {
+		this.connectDbFunc = connect
 		this.Db.SetConnect(this.connectDbFunc)
 	}