diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 6ca1bfa..d8ac007 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -6,7 +6,6 @@
   <component name="ChangeListManager">
     <list default="true" readonly="true" id="03ed5703-81a1-441b-849c-c426276586b7" name="Default" comment="">
       <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" afterPath="$PROJECT_DIR$/.idea/workspace.xml" />
-      <change beforePath="$PROJECT_DIR$/db.go" afterPath="$PROJECT_DIR$/db.go" />
       <change beforePath="$PROJECT_DIR$/example/main.go" afterPath="$PROJECT_DIR$/example/main.go" />
     </list>
     <ignored path=".idea/dataSources.local.xml" />
@@ -25,11 +24,11 @@
   </component>
   <component name="FileEditorManager">
     <leaf SIDE_TABS_SIZE_LIMIT_KEY="300">
-      <file leaf-file-name="main.go" pinned="false" current-in-tab="false">
+      <file leaf-file-name="main.go" pinned="false" current-in-tab="true">
         <entry file="file://$PROJECT_DIR$/example/main.go">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="165">
-              <caret line="11" column="1" lean-forward="true" selection-start-line="11" selection-start-column="1" selection-end-line="11" selection-end-column="1" />
+            <state relative-caret-position="285">
+              <caret line="55" column="59" lean-forward="true" selection-start-line="55" selection-start-column="59" selection-end-line="55" selection-end-column="59" />
               <folding>
                 <element signature="e#14#209#0" expanded="true" />
               </folding>
@@ -51,7 +50,7 @@
         <entry file="file://$PROJECT_DIR$/cache/cache_redis.go">
           <provider selected="true" editor-type-id="text-editor">
             <state relative-caret-position="180">
-              <caret line="12" column="14" lean-forward="true" selection-start-line="12" selection-start-column="14" selection-end-line="12" selection-end-column="14" />
+              <caret line="12" column="14" lean-forward="false" selection-start-line="12" selection-start-column="14" selection-end-line="12" selection-end-column="14" />
               <folding>
                 <element signature="e#15#106#0" expanded="true" />
               </folding>
@@ -63,7 +62,7 @@
         <entry file="file://$PROJECT_DIR$/cache_memory.go">
           <provider selected="true" editor-type-id="text-editor">
             <state relative-caret-position="225">
-              <caret line="19" column="18" lean-forward="true" selection-start-line="19" selection-start-column="18" selection-end-line="19" selection-end-column="18" />
+              <caret line="19" column="18" lean-forward="false" selection-start-line="19" selection-start-column="18" selection-end-line="19" selection-end-column="18" />
               <folding />
             </state>
           </provider>
@@ -79,11 +78,11 @@
           </provider>
         </entry>
       </file>
-      <file leaf-file-name="db.go" pinned="false" current-in-tab="true">
+      <file leaf-file-name="db.go" pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/db.go">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="120">
-              <caret line="8" column="13" lean-forward="false" selection-start-line="8" selection-start-column="13" selection-end-line="8" selection-end-column="13" />
+            <state relative-caret-position="105">
+              <caret line="7" column="13" lean-forward="false" selection-start-line="7" selection-start-column="13" selection-end-line="7" selection-end-column="13" />
               <folding />
             </state>
           </provider>
@@ -200,8 +199,8 @@
         <option value="$PROJECT_DIR$/cache_memory.go" />
         <option value="$PROJECT_DIR$/cache_db.go" />
         <option value="$PROJECT_DIR$/cache/cache_redis.go" />
-        <option value="$PROJECT_DIR$/example/main.go" />
         <option value="$PROJECT_DIR$/db.go" />
+        <option value="$PROJECT_DIR$/example/main.go" />
       </list>
     </option>
   </component>
@@ -478,7 +477,7 @@
       <workItem from="1522778659126" duration="455000" />
       <workItem from="1522779789231" duration="6991000" />
       <workItem from="1523202491878" duration="853000" />
-      <workItem from="1523288830673" duration="5111000" />
+      <workItem from="1523288830673" duration="6206000" />
     </task>
     <task id="LOCAL-00001">
       <created>1500458878821</created>
@@ -690,11 +689,18 @@
       <option name="project" value="LOCAL" />
       <updated>1523294190912</updated>
     </task>
-    <option name="localTasksCounter" value="31" />
+    <task id="LOCAL-00031" summary="数据库缓存更新">
+      <created>1523294232321</created>
+      <option name="number" value="00031" />
+      <option name="presentableId" value="LOCAL-00031" />
+      <option name="project" value="LOCAL" />
+      <updated>1523294232321</updated>
+    </task>
+    <option name="localTasksCounter" value="32" />
     <servers />
   </component>
   <component name="TimeTrackingManager">
-    <option name="totallyTimeSpent" value="106634000" />
+    <option name="totallyTimeSpent" value="107729000" />
   </component>
   <component name="TodoView">
     <todo-panel id="selected-file">
@@ -710,12 +716,13 @@
     <editor active="true" />
     <layout>
       <window_info id="TODO" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.32846716" sideWeight="0.5" order="6" side_tool="false" content_ui="tabs" />
+      <window_info id="Messages" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.32911393" sideWeight="0.5" order="7" side_tool="false" content_ui="tabs" />
       <window_info id="Palette&#9;" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="3" side_tool="false" content_ui="tabs" />
       <window_info id="Image Layers" active="false" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="2" side_tool="false" content_ui="tabs" />
       <window_info id="Capture Analysis" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="3" side_tool="false" content_ui="tabs" />
       <window_info id="Event Log" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="7" side_tool="true" content_ui="tabs" />
       <window_info id="Maven Projects" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="3" side_tool="false" content_ui="tabs" />
-      <window_info id="Run" active="true" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="true" show_stripe_button="true" weight="0.328125" sideWeight="0.5" order="2" side_tool="false" content_ui="tabs" />
+      <window_info id="Run" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="true" show_stripe_button="true" weight="0.328125" sideWeight="0.5" order="2" side_tool="false" content_ui="tabs" />
       <window_info id="Version Control" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.6322917" sideWeight="0.5" order="7" side_tool="false" content_ui="tabs" />
       <window_info id="Terminal" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.32805908" sideWeight="0.5" order="7" side_tool="false" content_ui="tabs" />
       <window_info id="Capture Tool" active="false" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="2" side_tool="false" content_ui="tabs" />
@@ -734,7 +741,6 @@
       <window_info id="Execute Anonymous" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="7" side_tool="false" content_ui="tabs" />
       <window_info id="Hierarchy" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.25" sideWeight="0.5" order="2" side_tool="false" content_ui="combo" />
       <window_info id="Salesforce" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="7" side_tool="false" content_ui="tabs" />
-      <window_info id="Messages" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.32911393" sideWeight="0.5" order="7" side_tool="false" content_ui="tabs" />
       <window_info id="Inspection" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.4" sideWeight="0.5" order="5" side_tool="false" content_ui="tabs" />
       <window_info id="Find" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="1" side_tool="false" content_ui="tabs" />
     </layout>
@@ -1038,7 +1044,7 @@
     <entry file="file://$PROJECT_DIR$/cache/cache_redis.go">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="180">
-          <caret line="12" column="14" lean-forward="true" selection-start-line="12" selection-start-column="14" selection-end-line="12" selection-end-column="14" />
+          <caret line="12" column="14" lean-forward="false" selection-start-line="12" selection-start-column="14" selection-end-line="12" selection-end-column="14" />
           <folding>
             <element signature="e#15#106#0" expanded="true" />
           </folding>
@@ -1048,7 +1054,7 @@
     <entry file="file://$PROJECT_DIR$/cache_memory.go">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="225">
-          <caret line="19" column="18" lean-forward="true" selection-start-line="19" selection-start-column="18" selection-end-line="19" selection-end-column="18" />
+          <caret line="19" column="18" lean-forward="false" selection-start-line="19" selection-start-column="18" selection-end-line="19" selection-end-column="18" />
           <folding />
         </state>
       </provider>
@@ -1069,23 +1075,23 @@
         </state>
       </provider>
     </entry>
+    <entry file="file://$PROJECT_DIR$/db.go">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="105">
+          <caret line="7" column="13" lean-forward="false" selection-start-line="7" selection-start-column="13" selection-end-line="7" selection-end-column="13" />
+          <folding />
+        </state>
+      </provider>
+    </entry>
     <entry file="file://$PROJECT_DIR$/example/main.go">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="165">
-          <caret line="11" column="1" lean-forward="true" selection-start-line="11" selection-start-column="1" selection-end-line="11" selection-end-column="1" />
+        <state relative-caret-position="285">
+          <caret line="55" column="59" lean-forward="true" selection-start-line="55" selection-start-column="59" selection-end-line="55" selection-end-column="59" />
           <folding>
             <element signature="e#14#209#0" expanded="true" />
           </folding>
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/db.go">
-      <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="120">
-          <caret line="8" column="13" lean-forward="false" selection-start-line="8" selection-start-column="13" selection-end-line="8" selection-end-column="13" />
-          <folding />
-        </state>
-      </provider>
-    </entry>
   </component>
 </project>
\ No newline at end of file
diff --git a/example/main.go b/example/main.go
index dc4ee6c..bcd0514 100644
--- a/example/main.go
+++ b/example/main.go
@@ -49,6 +49,9 @@ func main() {
 		}
 		return DB
 	})
+	//内存缓存数据库数据，错误则删除
+//	appIns.Db.CacheIns=hotime.CacheIns(&hotime.CacheMemory{})
+
 	appIns.SetSession(hotime.CacheIns(&hotime.CacheMemory{}), hotime.CacheIns(&hotime.CacheDb{Db: &appIns.Db, Time: appIns.Config.GetInt64("cacheTime")}))
 	appIns.SetCache(hotime.CacheIns(&hotime.CacheMemory{}))