Question

我正在使用fullowing模式为我的数据库存储消息传递线程。

CREATE TABLE threads(
    _id INTEGER PRIMARY KEY AUTOINCREMENT, 
    date_sent_or_received INTEGER, 
    read INTEGER, 
    count INTEGER, 
    body TEXT, 
    address TEXT, 
    error_code INTEGER);

每当我将值插入SMS表时，我都会触发该触发器。

CREATE TRIGGER update_thread_id AFTER INSERT ON sms
WHEN
0 <> (select count() from threads
      where length(address)>=length(new.address)
        and substr(address, length(address)-length(new.address)+1) like new.address)
BEGIN
UPDATE threads SET
    address = new. address
where substr(address, length(address)-length(new.address)+1) like new.address;

UPDATE threads SET
    date_sent_or_received=new.date_sent_or_received,
    read = new.read,
    body = new.body 
where date_sent_or_received<=new.date_sent_or_received
  and address like new.address;

UPDATE sms SET
    thread_id= (select _id from threads
                where address like new.address)
where _id = new._id;

UPDATE threads SET
    count = (select count() from sms 
             where thread_id=(select _id from threads 
                              where address like new.address))
where address like new.address;

END;

我遇到问题陈述，我试图改变线程的内容，只有当它比新的更早时。它是这样的。

UPDATE threads SET
    date_sent_or_received=new.date_sent_or_received,
    read = new.read,
    body = new.body 
where date_sent_or_received<=new.date_sent_or_received
  and address like new.address;

然而，它不起作用。即使新插入的行在时间戳中较大，表的内容也保持不变，此触发器根据新添加的行更新地址。

我在Integer中存储秒数。我错的任何想法？

Answer 1

我不知道你问题的确切解决方案。但由于您的问题与查询有关，并且如果您在SQLite中执行这些操作，请在SQliteBrowser或SQLite管理器中测试您的SQL语句。在那里，您可以了解数据库如何对您的陈述作出反应。

UNIX时间戳比较

1 个答案: