diff --git a/app/src/main/java/com/hippo/ehviewer/EhDB.java b/app/src/main/java/com/hippo/ehviewer/EhDB.java
index b5048fe71..119905174 100644
--- a/app/src/main/java/com/hippo/ehviewer/EhDB.java
+++ b/app/src/main/java/com/hippo/ehviewer/EhDB.java
@@ -29,6 +29,7 @@ import androidx.room.Room;
 
 import com.hippo.ehviewer.client.data.GalleryInfo;
 import com.hippo.ehviewer.client.data.ListUrlBuilder;
+import com.hippo.ehviewer.dao.BasicDao;
 import com.hippo.ehviewer.dao.DownloadDirname;
 import com.hippo.ehviewer.dao.DownloadDirnameDao;
 import com.hippo.ehviewer.dao.DownloadInfo;
@@ -43,9 +44,18 @@ import com.hippo.ehviewer.dao.LocalFavoriteInfo;
 import com.hippo.ehviewer.dao.LocalFavoritesDao;
 import com.hippo.ehviewer.dao.QuickSearch;
 import com.hippo.ehviewer.dao.QuickSearchDao;
+import com.hippo.ehviewer.download.DownloadManager;
 import com.hippo.util.ExceptionUtils;
+import com.hippo.yorozuya.IOUtils;
+import com.hippo.yorozuya.ObjectUtils;
 import com.hippo.yorozuya.collect.SparseJLArray;
 
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -53,6 +63,8 @@ public class EhDB {
 
     private static final String TAG = EhDB.class.getSimpleName();
 
+    private static final int CUR_DB_VER = 4;
+
     private static final int MAX_HISTORY_COUNT = 200;
 
     private static EhDatabase db;
@@ -589,15 +601,159 @@ public class EhDB {
         db.filterDao().update(filter);
     }
 
-    public static synchronized boolean exportDB(Context context, Uri uri) {
+    private static <T> boolean copyDao(BasicDao<T> from, BasicDao<T> to) {
+        List<T> list = from.fakeList();
+        for (T item : list)
+            to.fakeInsert(item);
         return false;
     }
 
+    public static synchronized boolean exportDB(Context context, Uri uri) {
+        final String ehExportName = "eh.export.db";
+
+        // Delete old export db
+        context.deleteDatabase(ehExportName);
+        EhDatabase newDb = Room.databaseBuilder(context, EhDatabase.class, ehExportName).allowMainThreadQueries().build();
+
+        try {
+            // Copy data to a export db
+            if (copyDao(db.downloadsDao(), newDb.downloadsDao()))
+                return false;
+            if (copyDao(db.downloadLabelDao(), newDb.downloadLabelDao()))
+                return false;
+            if (copyDao(db.downloadDirnameDao(), newDb.downloadDirnameDao()))
+                return false;
+            if (copyDao(db.historyDao(), newDb.historyDao()))
+                return false;
+            if (copyDao(db.quickSearchDao(), newDb.quickSearchDao()))
+                return false;
+            if (copyDao(db.localFavoritesDao(), newDb.localFavoritesDao()))
+                return false;
+            if (copyDao(db.filterDao(), newDb.filterDao()))
+                return false;
+
+            // Copy export db to data dir
+            File dbFile = context.getDatabasePath(ehExportName);
+            if (dbFile == null || !dbFile.isFile()) {
+                return false;
+            }
+            InputStream is = null;
+            OutputStream os = null;
+            try {
+                is = new FileInputStream(dbFile);
+                os = context.getContentResolver().openOutputStream(uri);
+                IOUtils.copy(is, os);
+                return true;
+            } catch (IOException e) {
+                e.printStackTrace();
+            } finally {
+                IOUtils.closeQuietly(is);
+                IOUtils.closeQuietly(os);
+            }
+            // Delete failed file
+            return false;
+        } finally {
+            context.deleteDatabase(ehExportName);
+        }
+    }
+
     /**
      * @return error string, null for no error
      */
     public static synchronized String importDB(Context context, Uri uri) {
-        return "";
+        try {
+            InputStream inputStream = context.getContentResolver().openInputStream(uri);
+            File file = File.createTempFile("importDatabase", "");
+            FileOutputStream outputStream = new FileOutputStream(file);
+            byte[] buff = new byte[1024];
+            int read;
+            if (inputStream != null) {
+                while ((read = inputStream.read(buff, 0, buff.length)) > 0) {
+                    outputStream.write(buff, 0, read);
+                }
+            } else {
+                return context.getString(R.string.cant_read_the_file);
+            }
+            inputStream.close();
+            outputStream.close();
+
+            SQLiteDatabase oldDB = SQLiteDatabase.openDatabase(
+                    file.getPath(), null, SQLiteDatabase.NO_LOCALIZED_COLLATORS);
+            int newVersion = CUR_DB_VER;
+            int oldVersion = oldDB.getVersion();
+            if (oldVersion < newVersion) {
+                upgradeDB(oldDB, oldVersion);
+                oldDB.setVersion(newVersion);
+            } else if (oldVersion > newVersion) {
+                return context.getString(R.string.cant_read_the_file);
+            }
+
+            String tmpDBName = "tmp.db";
+            context.deleteDatabase(tmpDBName);
+            EhDatabase oldRoomDatabase = Room.databaseBuilder(context, EhDatabase.class, tmpDBName)
+                    .createFromFile(file).allowMainThreadQueries().build();
+
+
+            // Downloads
+            DownloadManager manager = EhApplication.getDownloadManager(context);
+            List<DownloadInfo> downloadInfoList = oldRoomDatabase.downloadsDao().list();
+            manager.addDownload(downloadInfoList, false);
+
+            // Download label
+            List<DownloadLabel> downloadLabelList = oldRoomDatabase.downloadLabelDao().list();
+            manager.addDownloadLabel(downloadLabelList);
+
+            // Download dirname
+            List<DownloadDirname> downloadDirnameList = oldRoomDatabase.downloadDirnameDao().fakeList();
+            for (DownloadDirname dirname : downloadDirnameList) {
+                putDownloadDirname(dirname.getGid(), dirname.getDirname());
+            }
+
+            // History
+            List<HistoryInfo> historyInfoList = oldRoomDatabase.historyDao().list();
+            putHistoryInfo(historyInfoList);
+
+            // QuickSearch
+            List<QuickSearch> quickSearchList = oldRoomDatabase.quickSearchDao().list();
+            List<QuickSearch> currentQuickSearchList = db.quickSearchDao().list();
+            List<QuickSearch> importList = new ArrayList<>();
+            for (QuickSearch quickSearch : quickSearchList) {
+                String name = quickSearch.name;
+                for (QuickSearch q : currentQuickSearchList) {
+                    if (ObjectUtils.equal(q.name, name)) {
+                        // The same name
+                        name = null;
+                        break;
+                    }
+                }
+                if (null == name) {
+                    continue;
+                }
+                importList.add(quickSearch);
+            }
+            importQuickSearch(importList);
+
+            // LocalFavorites
+            List<LocalFavoriteInfo> localFavoriteInfoList = oldRoomDatabase.localFavoritesDao().list();
+            for (LocalFavoriteInfo info : localFavoriteInfoList) {
+                putLocalFavorites(info);
+            }
+
+            // Filter
+            List<Filter> filterList = oldRoomDatabase.filterDao().list();
+            List<Filter> currentFilterList = db.filterDao().list();
+            for (Filter filter : filterList) {
+                if (!currentFilterList.contains(filter)) {
+                    addFilter(filter);
+                }
+            }
+
+            return null;
+        } catch (Throwable e) {
+            ExceptionUtils.throwIfFatal(e);
+            // Ignore
+            return context.getString(R.string.cant_read_the_file);
+        }
     }
 
     private static class OldDBHelper extends SQLiteOpenHelper {
diff --git a/app/src/main/java/com/hippo/ehviewer/client/data/GalleryInfo.java b/app/src/main/java/com/hippo/ehviewer/client/data/GalleryInfo.java
index 6dd53d7f9..0afe1506f 100644
--- a/app/src/main/java/com/hippo/ehviewer/client/data/GalleryInfo.java
+++ b/app/src/main/java/com/hippo/ehviewer/client/data/GalleryInfo.java
@@ -195,6 +195,7 @@ public class GalleryInfo implements Parcelable {
     }
 
     private void generateSLangFromTags() {
+        assert simpleTags != null;
         for (String tag : simpleTags) {
             for (int i = 0; i < S_LANGS.length; i++) {
                 if (S_LANG_TAGS[i].equals(tag)) {
diff --git a/app/src/main/java/com/hippo/ehviewer/dao/BasicDao.java b/app/src/main/java/com/hippo/ehviewer/dao/BasicDao.java
new file mode 100644
index 000000000..fc7940dbc
--- /dev/null
+++ b/app/src/main/java/com/hippo/ehviewer/dao/BasicDao.java
@@ -0,0 +1,8 @@
+package com.hippo.ehviewer.dao;
+
+import java.util.List;
+
+public interface BasicDao<T> {
+    List<T> fakeList();
+    void fakeInsert(T t);
+}
diff --git a/app/src/main/java/com/hippo/ehviewer/dao/BookmarkInfo.java b/app/src/main/java/com/hippo/ehviewer/dao/BookmarkInfo.java
index 328b836d9..73f529513 100644
--- a/app/src/main/java/com/hippo/ehviewer/dao/BookmarkInfo.java
+++ b/app/src/main/java/com/hippo/ehviewer/dao/BookmarkInfo.java
@@ -9,8 +9,7 @@ import com.hippo.ehviewer.client.data.GalleryInfo;
 
 @Entity(tableName = "BOOKMARKS")
 public class BookmarkInfo extends GalleryInfo {
-
-    public static final Creator<BookmarkInfo> CREATOR = new Creator<BookmarkInfo>() {
+    public static final Creator<BookmarkInfo> CREATOR = new Creator<>() {
         @Override
         public BookmarkInfo createFromParcel(Parcel source) {
             return new BookmarkInfo(source);
@@ -158,5 +157,4 @@ public class BookmarkInfo extends GalleryInfo {
         dest.writeInt(this.page);
         dest.writeLong(this.time);
     }
-
 }
diff --git a/app/src/main/java/com/hippo/ehviewer/dao/BookmarksBao.java b/app/src/main/java/com/hippo/ehviewer/dao/BookmarksDao.java
similarity index 87%
rename from app/src/main/java/com/hippo/ehviewer/dao/BookmarksBao.java
rename to app/src/main/java/com/hippo/ehviewer/dao/BookmarksDao.java
index ede23fbc8..5ab452b69 100644
--- a/app/src/main/java/com/hippo/ehviewer/dao/BookmarksBao.java
+++ b/app/src/main/java/com/hippo/ehviewer/dao/BookmarksDao.java
@@ -5,12 +5,10 @@ import androidx.room.Delete;
 import androidx.room.Insert;
 
 @Dao
-public interface BookmarksBao {
-
+public interface BookmarksDao {
     @Insert
     void insert(BookmarkInfo bookmark);
 
     @Delete
     void delete(BookmarkInfo bookmark);
-
 }
diff --git a/app/src/main/java/com/hippo/ehviewer/dao/DownloadDirname.java b/app/src/main/java/com/hippo/ehviewer/dao/DownloadDirname.java
index 2b5df9fb3..049c4d7cd 100644
--- a/app/src/main/java/com/hippo/ehviewer/dao/DownloadDirname.java
+++ b/app/src/main/java/com/hippo/ehviewer/dao/DownloadDirname.java
@@ -6,7 +6,6 @@ import androidx.room.PrimaryKey;
 
 @Entity(tableName = "DOWNLOAD_DIRNAME")
 public class DownloadDirname {
-
     @PrimaryKey
     @ColumnInfo(name = "GID")
     private long gid;
@@ -28,5 +27,4 @@ public class DownloadDirname {
     public void setDirname(String dirname) {
         this.dirname = dirname;
     }
-
 }
diff --git a/app/src/main/java/com/hippo/ehviewer/dao/DownloadDirnameDao.java b/app/src/main/java/com/hippo/ehviewer/dao/DownloadDirnameDao.java
index 319205be4..f206bf725 100644
--- a/app/src/main/java/com/hippo/ehviewer/dao/DownloadDirnameDao.java
+++ b/app/src/main/java/com/hippo/ehviewer/dao/DownloadDirnameDao.java
@@ -5,9 +5,10 @@ import androidx.room.Insert;
 import androidx.room.Query;
 import androidx.room.Update;
 
-@Dao
-public interface DownloadDirnameDao {
+import java.util.List;
 
+@Dao
+public interface DownloadDirnameDao extends BasicDao<DownloadDirname> {
     @Query("SELECT * FROM DOWNLOAD_DIRNAME WHERE GID = :gid")
     DownloadDirname load(long gid);
 
@@ -15,11 +16,17 @@ public interface DownloadDirnameDao {
     void update(DownloadDirname downloadDirname);
 
     @Insert
-    void insert(DownloadDirname downloadDirname);
+    long insert(DownloadDirname downloadDirname);
 
     @Query("DELETE FROM DOWNLOAD_DIRNAME WHERE GID = :gid")
     void deleteByKey(long gid);
 
     @Query("DELETE FROM DOWNLOAD_DIRNAME")
     void deleteAll();
+
+    @Query("SELECT * FROM DOWNLOAD_DIRNAME")
+    List<DownloadDirname> fakeList();
+
+    @Insert
+    void fakeInsert(DownloadDirname t);
 }
diff --git a/app/src/main/java/com/hippo/ehviewer/dao/DownloadInfo.java b/app/src/main/java/com/hippo/ehviewer/dao/DownloadInfo.java
index 15c52de37..58d8ebf6b 100644
--- a/app/src/main/java/com/hippo/ehviewer/dao/DownloadInfo.java
+++ b/app/src/main/java/com/hippo/ehviewer/dao/DownloadInfo.java
@@ -10,8 +10,7 @@ import com.hippo.ehviewer.client.data.GalleryInfo;
 
 @Entity(tableName = "DOWNLOADS")
 public class DownloadInfo extends GalleryInfo {
-
-    public static final Creator<DownloadInfo> CREATOR = new Creator<DownloadInfo>() {
+    public static final Creator<DownloadInfo> CREATOR = new Creator<>() {
         @Override
         public DownloadInfo createFromParcel(Parcel source) {
             return new DownloadInfo(source);
@@ -250,5 +249,4 @@ public class DownloadInfo extends GalleryInfo {
     public void setTotal(int total) {
         this.total = total;
     }
-
 }
diff --git a/app/src/main/java/com/hippo/ehviewer/dao/DownloadLabel.java b/app/src/main/java/com/hippo/ehviewer/dao/DownloadLabel.java
index 022bdffd9..f1b51a7d3 100644
--- a/app/src/main/java/com/hippo/ehviewer/dao/DownloadLabel.java
+++ b/app/src/main/java/com/hippo/ehviewer/dao/DownloadLabel.java
@@ -6,7 +6,6 @@ import androidx.room.PrimaryKey;
 
 @Entity(tableName = "DOWNLOAD_LABELS")
 public class DownloadLabel {
-
     @PrimaryKey
     @ColumnInfo(name = "_id")
     private Long id;
@@ -38,5 +37,4 @@ public class DownloadLabel {
     public void setTime(long time) {
         this.time = time;
     }
-
 }
diff --git a/app/src/main/java/com/hippo/ehviewer/dao/DownloadLabelDao.java b/app/src/main/java/com/hippo/ehviewer/dao/DownloadLabelDao.java
index b9f555faa..946fe44c6 100644
--- a/app/src/main/java/com/hippo/ehviewer/dao/DownloadLabelDao.java
+++ b/app/src/main/java/com/hippo/ehviewer/dao/DownloadLabelDao.java
@@ -9,8 +9,7 @@ import androidx.room.Update;
 import java.util.List;
 
 @Dao
-public interface DownloadLabelDao {
-
+public interface DownloadLabelDao extends BasicDao<DownloadLabel> {
     @Query("SELECT * FROM DOWNLOAD_LABELS ORDER BY TIME ASC")
     List<DownloadLabel> list();
 
@@ -28,4 +27,10 @@ public interface DownloadLabelDao {
 
     @Delete
     void delete(DownloadLabel downloadLabel);
+
+    @Query("SELECT * FROM DOWNLOAD_LABELS ORDER BY TIME ASC")
+    List<DownloadLabel> fakeList();
+
+    @Insert
+    void fakeInsert(DownloadLabel t);
 }
diff --git a/app/src/main/java/com/hippo/ehviewer/dao/DownloadsDao.java b/app/src/main/java/com/hippo/ehviewer/dao/DownloadsDao.java
index b61ae894f..dc738cd78 100644
--- a/app/src/main/java/com/hippo/ehviewer/dao/DownloadsDao.java
+++ b/app/src/main/java/com/hippo/ehviewer/dao/DownloadsDao.java
@@ -9,10 +9,7 @@ import androidx.room.Update;
 import java.util.List;
 
 @Dao
-public interface DownloadsDao {
-
-    String TABLENAME = "DOWNLOADS";
-
+public interface DownloadsDao extends BasicDao<DownloadInfo> {
     @Query("SELECT * FROM DOWNLOADS ORDER BY TIME DESC")
     List<DownloadInfo> list();
 
@@ -23,9 +20,14 @@ public interface DownloadsDao {
     void update(DownloadInfo downloadInfo);
 
     @Insert
-    void insert(DownloadInfo downloadInfo);
+    long insert(DownloadInfo downloadInfo);
 
     @Delete
     void delete(DownloadInfo downloadInfo);
 
+    @Query("SELECT * FROM DOWNLOADS ORDER BY TIME DESC")
+    List<DownloadInfo> fakeList();
+
+    @Insert
+    void fakeInsert(DownloadInfo t);
 }
diff --git a/app/src/main/java/com/hippo/ehviewer/dao/EhDatabase.java b/app/src/main/java/com/hippo/ehviewer/dao/EhDatabase.java
index 308a1b348..780c20fb7 100644
--- a/app/src/main/java/com/hippo/ehviewer/dao/EhDatabase.java
+++ b/app/src/main/java/com/hippo/ehviewer/dao/EhDatabase.java
@@ -5,7 +5,7 @@ import androidx.room.RoomDatabase;
 
 @Database(entities = {BookmarkInfo.class, DownloadInfo.class, DownloadLabel.class, DownloadDirname.class, Filter.class, HistoryInfo.class, LocalFavoriteInfo.class, QuickSearch.class}, version = 4, exportSchema = false)
 public abstract class EhDatabase extends RoomDatabase {
-    public abstract BookmarksBao bookmarksBao();
+    public abstract BookmarksDao bookmarksBao();
 
     public abstract DownloadDirnameDao downloadDirnameDao();
 
diff --git a/app/src/main/java/com/hippo/ehviewer/dao/Filter.java b/app/src/main/java/com/hippo/ehviewer/dao/Filter.java
index 48e572333..ede60ee24 100644
--- a/app/src/main/java/com/hippo/ehviewer/dao/Filter.java
+++ b/app/src/main/java/com/hippo/ehviewer/dao/Filter.java
@@ -9,7 +9,6 @@ import com.hippo.yorozuya.ObjectUtils;
 
 @Entity(tableName = "FILTER")
 public class Filter {
-
     @ColumnInfo(name = "MODE")
     public int mode;
     @ColumnInfo(name = "TEXT")
@@ -65,5 +64,4 @@ public class Filter {
         Filter filter = (Filter) o;
         return filter.mode == mode && ObjectUtils.equal(filter.text, text);
     }
-
 }
diff --git a/app/src/main/java/com/hippo/ehviewer/dao/FilterDao.java b/app/src/main/java/com/hippo/ehviewer/dao/FilterDao.java
index 688e87880..ad39a0f4e 100644
--- a/app/src/main/java/com/hippo/ehviewer/dao/FilterDao.java
+++ b/app/src/main/java/com/hippo/ehviewer/dao/FilterDao.java
@@ -9,10 +9,7 @@ import androidx.room.Update;
 import java.util.List;
 
 @Dao
-public interface FilterDao {
-
-    String TABLENAME = "FILTER";
-
+public interface FilterDao extends BasicDao<Filter> {
     @Query("SELECT * FROM FILTER")
     List<Filter> list();
 
@@ -25,4 +22,9 @@ public interface FilterDao {
     @Delete
     void delete(Filter filter);
 
+    @Query("SELECT * FROM FILTER")
+    List<Filter> fakeList();
+
+    @Insert
+    void fakeInsert(Filter t);
 }
diff --git a/app/src/main/java/com/hippo/ehviewer/dao/HistoryDao.java b/app/src/main/java/com/hippo/ehviewer/dao/HistoryDao.java
index 802cb934c..d7e1101bb 100644
--- a/app/src/main/java/com/hippo/ehviewer/dao/HistoryDao.java
+++ b/app/src/main/java/com/hippo/ehviewer/dao/HistoryDao.java
@@ -9,8 +9,7 @@ import androidx.room.Update;
 import java.util.List;
 
 @Dao
-public interface HistoryDao {
-
+public interface HistoryDao extends BasicDao<HistoryInfo> {
     @Query("SELECT * FROM HISTORY WHERE GID = :gid")
     HistoryInfo load(long gid);
 
@@ -24,7 +23,7 @@ public interface HistoryDao {
     void update(HistoryInfo historyInfo);
 
     @Insert
-    void insert(HistoryInfo historyInfo);
+    long insert(HistoryInfo historyInfo);
 
     @Delete
     void delete(HistoryInfo historyInfos);
@@ -35,4 +34,9 @@ public interface HistoryDao {
     @Query("DELETE FROM HISTORY")
     void deleteAll();
 
+    @Query("SELECT * FROM HISTORY ORDER BY TIME DESC")
+    List<HistoryInfo> fakeList();
+
+    @Insert
+    void fakeInsert(HistoryInfo t);
 }
diff --git a/app/src/main/java/com/hippo/ehviewer/dao/HistoryInfo.java b/app/src/main/java/com/hippo/ehviewer/dao/HistoryInfo.java
index 205d0a14d..01fec78fe 100644
--- a/app/src/main/java/com/hippo/ehviewer/dao/HistoryInfo.java
+++ b/app/src/main/java/com/hippo/ehviewer/dao/HistoryInfo.java
@@ -9,8 +9,7 @@ import com.hippo.ehviewer.client.data.GalleryInfo;
 
 @Entity(tableName = "HISTORY")
 public class HistoryInfo extends GalleryInfo {
-
-    public static final Creator<HistoryInfo> CREATOR = new Creator<HistoryInfo>() {
+    public static final Creator<HistoryInfo> CREATOR = new Creator<>() {
         @Override
         public HistoryInfo createFromParcel(Parcel source) {
             return new HistoryInfo(source);
@@ -158,5 +157,4 @@ public class HistoryInfo extends GalleryInfo {
         dest.writeInt(this.mode);
         dest.writeLong(this.time);
     }
-
 }
diff --git a/app/src/main/java/com/hippo/ehviewer/dao/LocalFavoriteInfo.java b/app/src/main/java/com/hippo/ehviewer/dao/LocalFavoriteInfo.java
index cc4507183..e7a5fa601 100644
--- a/app/src/main/java/com/hippo/ehviewer/dao/LocalFavoriteInfo.java
+++ b/app/src/main/java/com/hippo/ehviewer/dao/LocalFavoriteInfo.java
@@ -10,7 +10,7 @@ import com.hippo.ehviewer.client.data.GalleryInfo;
 @Entity(tableName = "LOCAL_FAVORITES")
 public class LocalFavoriteInfo extends GalleryInfo {
 
-    public static final Creator<LocalFavoriteInfo> CREATOR = new Creator<LocalFavoriteInfo>() {
+    public static final Creator<LocalFavoriteInfo> CREATOR = new Creator<>() {
         @Override
         public LocalFavoriteInfo createFromParcel(Parcel source) {
             return new LocalFavoriteInfo(source);
@@ -144,5 +144,4 @@ public class LocalFavoriteInfo extends GalleryInfo {
         super.writeToParcel(dest, flags);
         dest.writeLong(this.time);
     }
-
 }
diff --git a/app/src/main/java/com/hippo/ehviewer/dao/LocalFavoritesDao.java b/app/src/main/java/com/hippo/ehviewer/dao/LocalFavoritesDao.java
index 089261e8a..3a42d67d6 100644
--- a/app/src/main/java/com/hippo/ehviewer/dao/LocalFavoritesDao.java
+++ b/app/src/main/java/com/hippo/ehviewer/dao/LocalFavoritesDao.java
@@ -8,10 +8,7 @@ import androidx.room.Query;
 import java.util.List;
 
 @Dao
-public interface LocalFavoritesDao {
-
-    String TABLENAME = "LOCAL_FAVORITES";
-
+public interface LocalFavoritesDao extends BasicDao<LocalFavoriteInfo> {
     @Query("SELECT * FROM LOCAL_FAVORITES ORDER BY TIME DESC")
     List<LocalFavoriteInfo> list();
 
@@ -22,7 +19,7 @@ public interface LocalFavoritesDao {
     LocalFavoriteInfo load(long gid);
 
     @Insert
-    void insert(LocalFavoriteInfo localFavoriteInfo);
+    long insert(LocalFavoriteInfo localFavoriteInfo);
 
     @Delete
     void delete(LocalFavoriteInfo localFavoriteInfo);
@@ -30,4 +27,9 @@ public interface LocalFavoritesDao {
     @Query("DELETE FROM LOCAL_FAVORITES WHERE GID = :gid")
     void deleteByKey(long gid);
 
+    @Query("SELECT * FROM LOCAL_FAVORITES ORDER BY TIME DESC")
+    List<LocalFavoriteInfo> fakeList();
+
+    @Insert
+    void fakeInsert(LocalFavoriteInfo t);
 }
diff --git a/app/src/main/java/com/hippo/ehviewer/dao/QuickSearch.java b/app/src/main/java/com/hippo/ehviewer/dao/QuickSearch.java
index 022dae17b..d2b42e848 100644
--- a/app/src/main/java/com/hippo/ehviewer/dao/QuickSearch.java
+++ b/app/src/main/java/com/hippo/ehviewer/dao/QuickSearch.java
@@ -1,12 +1,12 @@
 package com.hippo.ehviewer.dao;
 
+import androidx.annotation.NonNull;
 import androidx.room.ColumnInfo;
 import androidx.room.Entity;
 import androidx.room.PrimaryKey;
 
 @Entity(tableName = "QUICK_SEARCH")
 public class QuickSearch {
-
     @PrimaryKey
     @ColumnInfo(name = "_id")
     public Long id;
@@ -109,9 +109,9 @@ public class QuickSearch {
         this.time = time;
     }
 
+    @NonNull
     @Override
     public String toString() {
         return name;
     }
-
 }
diff --git a/app/src/main/java/com/hippo/ehviewer/dao/QuickSearchDao.java b/app/src/main/java/com/hippo/ehviewer/dao/QuickSearchDao.java
index 62fc219f8..ca6db8dd9 100644
--- a/app/src/main/java/com/hippo/ehviewer/dao/QuickSearchDao.java
+++ b/app/src/main/java/com/hippo/ehviewer/dao/QuickSearchDao.java
@@ -9,10 +9,7 @@ import androidx.room.Update;
 import java.util.List;
 
 @Dao
-public interface QuickSearchDao {
-
-    String TABLENAME = "QUICK_SEARCH";
-
+public interface QuickSearchDao extends BasicDao<QuickSearch> {
     @Query("SELECT * FROM QUICK_SEARCH ORDER BY TIME ASC")
     List<QuickSearch> list();
 
@@ -31,4 +28,9 @@ public interface QuickSearchDao {
     @Delete
     void delete(QuickSearch quickSearch);
 
+    @Query("SELECT * FROM QUICK_SEARCH ORDER BY TIME ASC")
+    List<QuickSearch> fakeList();
+
+    @Insert
+    void fakeInsert(QuickSearch t);
 }