def categorySorting(self, id=0, treeitem=None):
db = ReaderDb()
db.execute("select * from folders where type='folder' and parent=?",(id,))
folders = db.cursor.fetchall()
for folder in folders:
item = QTreeWidgetItem(treeitem)
item.setIcon(0, QIcon(":/images/icons/folder_grey.png"))
item.id = folder["id"]
item.category_name = folder[1]
item.setText(0, item.category_name)
item.subcategory = folder["parent"]
self.categorySorting(folder["id"], item)
