使用房间数据库（房间持久性库）创建触发器

Question

如何使用会议室持久性库“创建触发器”

CREATE TRIGGER  IF NOT EXISTS delete_till_10 INSERT ON user WHEN (select count(*) from user)>9

BEGIN 

    DELETE FROM user WHERE id IN  (SELECT id FROM user ORDER BY id limit (select count(*) -9 from user));

END