Python’s SQLAlchemy vs Other ORMs[转发 4]peewee

peewee

peewee is a small, expressive ORM. Compared to other ORMs, peewee focuses on the principal of minimalism where the API is simple and the library is easy to use and understand.

 pip install peewee
 Downloading/unpacking peewee
 Downloading peewee-2.1.7.tar.gz (1.1MB): 1.1MB downloaded
 Running setup.py egg_info for package peewee

 Installing collected packages: peewee
 Running setup.py install for peewee
 changing mode of build/scripts-2.7/pwiz.py from 644 to 755

 changing mode of /Users/xiaonuogantan/python2-workspace/bin/pwiz.py to 755
 Successfully installed peewee
 Cleaning up...

To create a database model mapping, we implement a Person class and an Address class that map to the corresponding database tables.

 >>> from peewee import SqliteDatabase, CharField, ForeignKeyField, Model
 >>>
 >>> db = SqliteDatabase(':memory:')
 >>>
 >>> class Person(Model):
 ...     name = CharField()
 ...
 ...     class Meta:
 ...         database = db
 ...
 >>>
 >>> class Address(Model):
 ...     address = CharField()
 ...     person = ForeignKeyField(Person)
 ...
 ...     class Meta:
 ...         database = db
 ...
 >>> Person.create_table()
 >>> Address.create_table()

To insert objects into the database, we instantiate the objects and call their save() methods. From object creation point of view, peewee is very similar to Django.

 >>> p = Person(name='person')
 >>> p.save()
 >>> a = Address(address='address', person=p)
 >>> a.save()

To get or retrieve the objects from the database, we select the objects from their respective classes.

 >>> 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'address'