database: pagedao: Add-support for subpages

database/pagedaosqlite.h

@@ -28,6 +28,8 @@ class PageDaoSqlite : public PageDao, protected SqliteDao
 	int fetchPageId(std::string pagename);
 	std::vector<SearchResult> search(std::string query, QueryOption option) override;
 	void setCategories(std::string pagename, const std::vector<std::string> &catnames) override;
+	std::vector<std::string> getChildren(std::string pagename) override;
+
 };
 
 #endif // PAGEDAOSQLITE_H