flask SQLAlchemy query.filter_by 常用操作符

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'))

作者：治部少辅
链接：https://www.jianshu.com/p/8d085e2f2657
來源：简书
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