feat: 优化代码

app/src/main/java/io/legado/app/data/dao/BookSourceDao.kt

@@ -14,30 +14,25 @@ interface BookSourceDao {
     @Query("select * from book_sources where bookSourceName like :searchKey or bookSourceGroup like :searchKey or bookSourceUrl like :searchKey order by customOrder asc")
     fun liveDataSearch(searchKey: String = ""): LiveData<List<BookSource>>
 
-    @Query("select * from book_sources where enabledExplore = 1 and exploreUrl is not null and exploreUrl <> '' order by customOrder asc")
+    @Query("select * from book_sources where enabledExplore = 1 and trim(exploreUrl) <> '' order by customOrder asc")
     fun liveExplore(): LiveData<List<BookSource>>
 
     @Query(
         """
         select * from book_sources 
-        where enabledExplore = 1 and exploreUrl is not null and exploreUrl <> '' and (bookSourceGroup like :key or bookSourceName like :key) 
+        where enabledExplore = 1 and trim(exploreUrl) <> '' and (bookSourceGroup like :key or bookSourceName like :key) 
         order by customOrder asc
     """
     )
     fun liveExplore(key: String): LiveData<List<BookSource>>
 
-    @Query("select bookSourceGroup from book_sources where bookSourceGroup is not null and bookSourceGroup <> ''")
+    @Query("select bookSourceGroup from book_sources where trim(bookSourceGroup) <> ''")
     fun liveGroup(): LiveData<List<String>>
 
-    @Query("select bookSourceGroup from book_sources where enabled = 1 and bookSourceGroup is not null and bookSourceGroup <> ''")
+    @Query("select bookSourceGroup from book_sources where enabled = 1 and trim(bookSourceGroup) <> ''")
     fun liveGroupEnabled(): LiveData<List<String>>
 
-    @Query(
-        """
-        select bookSourceGroup from book_sources 
-        where enabledExplore = 1 and exploreUrl is not null and exploreUrl <> '' and bookSourceGroup is not null and bookSourceGroup <> ''
-    """
-    )
+    @Query("select bookSourceGroup from book_sources where enabledExplore = 1 and trim(exploreUrl) <> '' and trim(bookSourceGroup) <> ''")
     fun liveGroupExplore(): LiveData<List<String>>
 
     @Query("select distinct  enabled from book_sources where bookSourceName like :searchKey or bookSourceGroup like :searchKey or bookSourceUrl like :searchKey")