flask SQLAlchemy query.filter_by 經常使用操做符

經常使用的filter操做符

下面的這些操做符能夠應用在filter函數中

• 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'))

做者：治部少輔連接：https://www.jianshu.com/p/8d085e2f2657來源：簡書著做權歸做者全部。商業轉載請聯繫做者得到受權，非商業轉載請註明出處。