from sqlalchemy.orm import aliased subquery = session.query(User).filter(User.name.like("%somename%")).subquery() ua = aliased(User, subquery) user = session.query(ua).order_by(ua.id).first() 使用2.0 风格: from sqlalchemy.orm import aliased subquery = select(User).where(User.name.lik...
带有自定义 WHERE 条件的 ORM UPDATE 和 DELETE 使用RETURNING 进行 UPDATE/DELETE 和自定义 WHERE 条件 改进了 ORM UPDATE / DELETE 的synchronize_session行为 synchronize_session 的默认策略现在是一个新值"auto"。此策略将尝试使用"evaluate"策略,然后自动回退到"fetch"策略。对于除了 MySQL / MariaDB 之外的所有...
>>> print(s.query(User).filter(User.values == None)) SELECT "user".id AS user_id FROM "user" WHERE (EXISTS (SELECT 1 FROM element WHERE "user".id = element.user_id AND element.value IS NULL)) OR NOT (EXISTS (SELECT 1 FROM element WHERE "user".id = element.user_id)) 注意...
SELECT venue.id AS venue_id, venue.name AS venue_name FROM venue WHERE instr(venue.name, (? || ?)) = ? ORDER BY venue.name ('parent1', '/', 1) 以及一个 joinedload,例如: v1 = ( s.query(Venue) .filter_by(name="parent1") .options(joinedload(Venue.descendants)) .one() ) ...
findOne({ where: { firstName: 'John', lastName: 'Doe' } }).then(user => { user.getPosts().then(posts => { console.log(posts.map(post => post.get({ plain: true }))); }); }); 通过以上示例,你可以看到Sequelize如何简化了与数据库的交互,使得CRUD操作和关联管理变得更加直观和高效...
(skip).limit(limit).all()# 条件查询defget_active_users(db:Session):returndb.query(User).filter(User.is_active==True).all()# 复杂查询defsearch_users(db:Session,keyword:str):returndb.query(User).filter((User.username.ilike(f"%{keyword}%"))|(User.email.ilike(f"%{keyword}%")...
在上面的示例中,我们拦截了SessionEvents.pending_to_persistent()、SessionEvents.detached_to_persistent()、SessionEvents.deleted_to_persistent()和SessionEvents.loaded_as_persistent()事件钩子,以便拦截对象在进入持久状态时的行为,并在对象离开持久状态时拦截SessionEvents.persistent_to_detached()和SessionEvents.pers...
(object.prop) #条件查询,filter相当于wheresession.query(object).order_by(object.prop) #排序,默认升序,降序用descsession.query(object).order_by(object.prop.desc()).limit(10) #降序,及限制10条session.query(object.prop.label("别名")).filter(object.prop.like("%同同mony")) #模糊查询及给字段...
>>> person = Person.select().where(Person.name == 'person').get() >>> person >>> print '%r, %r' % (person.id, person.name) 1, u'person' >>> address = Address.select().where(Address.person == person).get() >>> print '%r, %r' % (address.id, address.address) 1, u'...
ret = session.query(Users).filter_by(name='alex').first() ret = session.query(Users).filter(text("id<:value and name=:name")).params(value=224, name='fred').order_by(User.id).all() ret = session.query(Users).from_statement(text("SELECT * FROM users where name=:name")).params...