Database UNIX时间戳比较

我正在为数据库使用fallowing模式来存储消息传递线程

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

每当我向SMS表中插入值时，就会激活一个空闲触发器

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;

我遇到了一个问题陈述，只有当线程的内容比新线程的内容旧时，我才试图更改线程的内容。事情是这样的

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;

但是，它不起作用。即使新插入的行的时间戳更大，表的内容也保持不变，此触发器根据新添加的行更新地址

我将秒存储为整数。

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你知道我哪里错了吗？

我不知道你问题的确切答案。但由于您的问题是关于查询的，如果您在SQLite中执行这些操作，请在SQliteBrowser或SQLiteManager中测试SQL语句。在这里，您可以了解数据库是如何对您的语句作出反应的