def filter_by(self, **kwargs): r"""Apply the given filtering criterion to a copy of this :class:`_query.Query`, using keyword expressions. e.g.:: session.query(MyClass).filter_by(name = 'some name') Multiple cr
SQLAlchemy 使用query查询的时,可以使用filter()和filter_by() 过滤条件。 filter_by() 参数直接用属性名,比较用一个= filter() 参数 用类名.属性名,比较用== filter_by() 语法 filter_by() 源码如下 deffilter_by(self, **kwargs):r"""Apply the given filtering criterion to a copy of this :clas...
query = session.query(User).filter(or_(User.id == 2,User.id == 3)) 此时sql语句为SELECT * FROM USER WHERE id=2 or id =3; 此时还需要添加一个条件or_(User.id == 4,User.id == 5) query = query.filter(or_(User.id == 4,User.id == 5)) 此时sql语句变为 SELECT * FROM USER...
query.filter(User.name != None)# alternatively, if pep8/linters are a concernquery.filter(User.name.isnot(None)) AND: # use and_()from sqlalchemy import and_ query.filter(and_(User.name =='ed', User.fullname =='Ed Jones'))# or send multiple expressions to .filter()query.filter...
Then we can apply filters to thatqueryobject (multiple times): fromsqlalchemy_filtersimportapply_filters# `query` should be a SQLAlchemy query objectfilter_spec=[{'field':'name','op':'==','value':'name_1'}]filtered_query=apply_filters(query,filter_spec)more_filters=[{'field':'foo_id...
results = db.query(v_MyView).filter(v_MyView.EntryTime >= datetime.time(5,0)).first() print(results.EntryTime) I get an error [42000] [Microsoft][ODBC Driver 17 for SQL Server][SQL Server]The data types time and datetime2 are incompatible in the greater than or equal to operator....
This query returns the number of customers lives in each town.To filter out the results based on the values returned by aggregate functions we use having() method which adds the HAVING clause to the SELECT statement. Just like the where() clause, it accepts a condition.1 2 3 4 5 6 7...
To filter records we use where() method. It accept a condition and adds a WHERE clause to the SELECT statement. 要过滤记录,我们使用 WHERE ()方法。它接受一个条件,并向 SELECT 语句添加一个 WHERE 子句。 s = select([items]).where( items.c.cost_price > 20 ) # This query will return ...
query(User).filter(User.age == 23).first() # one() 如果只能查询到一个结果,返回它,否则抛出异常。没有结果抛出sqlalchemy.orm.exc.NoResultFound, # 有超过一个结果时抛出sqlalchemy.orm.exc.MultipleResultsFound。 db.session.query(User).filter(User.age == 20).one() # one_or_none()比起one...
db.session.query(User).filter(User.name.like('%{0}%'.format("a"))).all() 以上的例子都是查询中使用比较多的,使用方面看大家喜好,filter_by() 对组合查询等等支持的不是很好,但是语法相对 filter() 简洁一些; 另外 filter() 还有很多其他的查询,大家可以自己去多多探讨。。。