常用的filter操作符

下面的这些操作符可以应用在filter函数中

• equals:

query.filter(User.name == 'ed')

• not equals:

query.filter(User.name != 'ed')

• LIKE:

query.filter(User.name.like('%ed%'))

• IN:

query.filter(User.name.in_(['ed', 'wendy', 'jack']))

# works with query objects too:

query.filter(User.name.in_(

        session.query(User.name).filter(User.name.like('%ed%'))

))

• NOT IN:

query.filter(~User.name.in_(['ed', 'wendy', 'jack']))

• IS NULL:

query.filter(User.name == None)

# alternatively, if pep8/linters are a concern

query.filter(User.name.is_(None))

• IS NOT NULL:

query.filter(User.name != None)

# alternatively, if pep8/linters are a concern

query.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(User.name == 'ed', User.fullname == 'Ed Jones')

# or chain multiple filter()/filter_by() calls

query.filter(User.name == 'ed').filter(User.fullname == 'Ed Jones')

• OR:

from sqlalchemy import or_

query.filter(or_(User.name == 'ed', User.name == 'wendy'))

• MATCH:

query.filter(User.name.match('wendy'))