Python 将此sql转换为flask sqlalchemy语法
我在用炼金术。Python 将此sql转换为flask sqlalchemy语法,python,mysql,sqlalchemy,flask,flask-sqlalchemy,Python,Mysql,Sqlalchemy,Flask,Flask Sqlalchemy,我在用炼金术。 以下是mysql: select u.id, count(i.id) as count from rss_urls as u left join rss_items as i on u.id = i.rss_urls_id group by u.id; 我该如何将其转化为炼金术 非常感谢 class RSS_urls(db.Model): id = db.Column(db.Integer, primary_key=True) link = db.Column(
以下是mysql:
select u.id, count(i.id) as count from rss_urls as u left join rss_items as i on u.id = i.rss_urls_id group by u.id;
我该如何将其转化为炼金术
非常感谢
class RSS_urls(db.Model):
id = db.Column(db.Integer, primary_key=True)
link = db.Column(db.String(200), unique=True)
add_time = db.Column(db.DateTime)
rss_items = db.relationship("RSS_items", backref="base_url", lazy="dynamic")
class RSS_items(db.Model):
id = db.Column(db.Integer, primary_key=True)
rss_urls_id = db.Column(db.Integer, db.ForeignKey("RSS_urls.id"))
link = db.Column(db.String(200))
title = db.Column(db.String(200))
这是一个模型。假设您有一个模型
RssUrl
和RssItem
,并且有一个关系RssUrl.rss\u项
db.session.query(RssUrl.id, db.func.count(RssUrl.id).label("count")
).join(RssUrl.rss_items).group_by(RssUrl.id)