Update database

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

@@ -0,0 +1,19 @@
+package io.legado.app.data.dao
+
+import androidx.lifecycle.LiveData
+import androidx.paging.DataSource
+import androidx.room.Dao
+import androidx.room.Query
+import io.legado.app.data.entities.Book
+
+
+@Dao
+interface BookDao {
+
+    @Query("SELECT * FROM books WHERE `group` = :group")
+    fun observeByGroup(group: Int): DataSource.Factory<Int, Book>
+
+    @Query("SELECT url FROM books WHERE `group` = :group")
+    fun observeUrlsByGroup(group: Int): LiveData<List<String>>
+
+}