diff --git a/src/Notesmaster/.idea/.name b/src/Notesmaster/.idea/.name
new file mode 100644
index 0000000..7efc0ae
--- /dev/null
+++ b/src/Notesmaster/.idea/.name
@@ -0,0 +1 @@
+Notes-master
\ No newline at end of file
diff --git a/src/Notesmaster/.idea/vcs.xml b/src/Notesmaster/.idea/vcs.xml
index 94a25f7..fdf1fc8 100644
--- a/src/Notesmaster/.idea/vcs.xml
+++ b/src/Notesmaster/.idea/vcs.xml
@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$/../.." vcs="Git" />
     <mapping directory="$PROJECT_DIR$" vcs="Git" />
   </component>
 </project>
\ No newline at end of file
diff --git a/src/Notesmaster/app/.project b/src/Notesmaster/app/.project
new file mode 100644
index 0000000..b3be08f
--- /dev/null
+++ b/src/Notesmaster/app/.project
@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>app</name>
+	<comment>Project app created by Buildship.</comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.buildship.core.gradleprojectbuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.buildship.core.gradleprojectnature</nature>
+	</natures>
+	<filteredResources>
+		<filter>
+			<id>1768961338889</id>
+			<name></name>
+			<type>30</type>
+			<matcher>
+				<id>org.eclipse.core.resources.regexFilterMatcher</id>
+				<arguments>node_modules|\.git|__CREATED_BY_JAVA_LANGUAGE_SERVER__</arguments>
+			</matcher>
+		</filter>
+	</filteredResources>
+</projectDescription>
diff --git a/src/Notesmaster/app/build.gradle.kts b/src/Notesmaster/app/build.gradle.kts
index 29cdd19..347ac46 100644
--- a/src/Notesmaster/app/build.gradle.kts
+++ b/src/Notesmaster/app/build.gradle.kts
@@ -56,9 +56,9 @@ dependencies {
 //        "exclude" to listOf("")
 //    )))
     //修改为如下代码：
-    implementation(files("D:\\college\\studying\\studying\\2025.09\\SE\\android\\client\\lib\\httpclient-osgi-4.5.14.jar"))
-    implementation(files("D:\\college\\studying\\studying\\2025.09\\SE\\android\\client\\lib\\httpclient-win-4.5.14.jar"))
-    implementation(files("D:\\college\\studying\\studying\\2025.09\\SE\\android\\client\\lib\\httpcore-4.4.16.jar"))
+    implementation(files("D:\\ke\\software_enginering\\httpcomponents-client-4.5.14-bin\\lib\\httpclient-osgi-4.5.14.jar"))
+    implementation(files("D:\\ke\\software_enginering\\httpcomponents-client-4.5.14-bin\\lib\\httpclient-win-4.5.14.jar"))
+    implementation(files("D:\\ke\\software_enginering\\httpcomponents-client-4.5.14-bin\\lib\\httpcore-4.4.16.jar"))
     testImplementation(libs.junit)
     androidTestImplementation(libs.ext.junit)
     androidTestImplementation(libs.espresso.core)
diff --git a/src/Notesmaster/app/src/main/java/net/micode/notes/data/NotesDatabaseHelper.java b/src/Notesmaster/app/src/main/java/net/micode/notes/data/NotesDatabaseHelper.java
index 5b334bc..8a516c8 100644
--- a/src/Notesmaster/app/src/main/java/net/micode/notes/data/NotesDatabaseHelper.java
+++ b/src/Notesmaster/app/src/main/java/net/micode/notes/data/NotesDatabaseHelper.java
@@ -511,36 +511,51 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
         boolean reCreateTriggers = false;
         boolean skipV2 = false;
 
-        // 从V1升级到V2（包括V2到V3）
-        if (oldVersion == 1) {
-            upgradeToV2(db);
-            skipV2 = true; // this upgrade including the upgrade from v2 to v3
-            oldVersion++;
-        }
-
-        // 从V2升级到V3
-        if (oldVersion == 2 && !skipV2) {
-            upgradeToV3(db);
-            reCreateTriggers = true;
-            oldVersion++;
-        }
-
-        // 从V3升级到V4
-        if (oldVersion == 3) {
-            upgradeToV4(db);
-            oldVersion++;
-        }
-
-        // 从V4升级到V5
-        if (oldVersion == 4) {
-            upgradeToV5(db);
-            oldVersion++;
-        }
-
-        // 从V5升级到V6
-        if (oldVersion == 5) {
-            upgradeToV6(db);
-            oldVersion++;
+        // 使用 while 循环逐步升级到目标版本
+        while (oldVersion < newVersion) {
+            switch (oldVersion) {
+                case 1:
+                    // 从V1升级到V2（包括V2到V3）
+                    upgradeToV2(db);
+                    skipV2 = true;
+                    oldVersion = 2;
+                    break;
+
+                case 2:
+                    // 从V2升级到V3（如果未被V2升级包含）
+                    if (!skipV2) {
+                        upgradeToV3(db);
+                        reCreateTriggers = true;
+                    }
+                    oldVersion = 3;
+                    break;
+
+                case 3:
+                    // 从V3升级到V4
+                    upgradeToV4(db);
+                    oldVersion = 4;
+                    break;
+
+                case 4:
+                    // 从V4升级到V5
+                    upgradeToV5(db);
+                    oldVersion = 5;
+                    break;
+
+                case 5:
+                    // 从V5升级到V6（仅在需要时）
+                    if (newVersion > 5) {
+                        upgradeToV6(db);
+                    }
+                    oldVersion = 6;
+                    break;
+
+                default:
+                    // 如果遇到未知版本，直接跳到目标版本
+                    Log.w(TAG, "Unknown database version: " + oldVersion + ", skipping to " + newVersion);
+                    oldVersion = newVersion;
+                    break;
+            }
         }
 
         // 如果需要，重新创建触发器
@@ -552,7 +567,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
         // 检查升级是否成功
         if (oldVersion != newVersion) {
             throw new IllegalStateException("Upgrade notes database to version " + newVersion
-                    + "fails");
+                    + " fails. Current version: " + oldVersion);
         }
     }