我认为在 sqlalchemy 中目前不可能实现这一点,并且并非所有 RDMBS 都支持此功能。
但是您可以将其转换为
OR(AND...)
条件:
filter_rows = [
(2752937066, 'http://members.aye.net/~gharris/blog/'),
(3799762538, 'http://www.coxandforkum.com/'),
]
qry = session.query(Page)
qry = qry.filter(or_(*(and_(Page.url_crc == crc, Page.url == url) for crc, url in filter_rows)))
print qry
应该生成类似以下(对于SQLite)的内容:
SELECT pages.id AS pages_id, pages.url_crc AS pages_url_crc, pages.url AS pages_url
FROM pages
WHERE pages.url_crc = ? AND pages.url = ? OR pages.url_crc = ? AND pages.url = ?
-- (2752937066L, 'http://members.aye.net/~gharris/blog/', 3799762538L, 'http://www.coxandforkum.com/')
或者,您可以将两个列合并为一个:
filter_rows = [
(2752937066, 'http://members.aye.net/~gharris/blog/'),
(3799762538, 'http://www.coxandforkum.com/'),
]
qry = session.query(Page)
qry = qry.filter((func.cast(Page.url_crc, String) + '|' + Page.url).in_(["{}|{}".format(*_frow) for _frow in filter_rows]))
print qry
下面是针对SQLite的输出结果,因此您可以使用IN
:
SELECT pages.id AS pages_id, pages.url_crc AS pages_url_crc, pages.url AS pages_url
FROM pages
WHERE (CAST(pages.url_crc AS VARCHAR) || ? || pages.url) IN (?, ?)
IN
版本的答案。 - van