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test_db.py
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test_db.py
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from sqlalchemy import create_engine, func, Table, Column, MetaData, ForeignKey, Integer, String, DateTime, Enum, BLOB, BigInteger, distinct
from sqlalchemy.orm import mapper,scoped_session, sessionmaker, relationship, contains_eager, aliased, joinedload
from sqlalchemy.ext.declarative import declarative_base
Base = declarative_base()
class Parent(Base):
__tablename__ = 'parent'
id = Column(Integer, primary_key=True)
children = relationship("Child",lazy='joined')
dog_id = Column(Integer, ForeignKey('dog.id'))
dog2_id = Column(Integer, ForeignKey('dog.id'))
cat_id = Column(Integer, ForeignKey('cat.id'))
dog = relationship("Dog", foreign_keys = dog_id,lazy='joined')
dog2 = relationship("Dog", foreign_keys = dog2_id,lazy='joined')
cat = relationship("Cat",lazy='joined')
class Child(Base):
__tablename__ = 'child'
id = Column(Integer, primary_key=True)
parent_id = Column(Integer, ForeignKey('parent.id'))
babies = relationship("Baby",lazy='joined')
brother_id = Column(Integer, ForeignKey('child.id'))
brother = relationship("Child",lazy='joined')
class Baby(Base):
__tablename__ = 'baby'
id = Column(Integer, primary_key=True)
child_id = Column(Integer, ForeignKey('child.id'))
class Dog(Base):
__tablename__ = 'dog'
id = Column(Integer, primary_key=True)
class Cat(Base):
__tablename__ = 'cat'
id = Column(Integer, primary_key=True)
engine = create_engine( 'mysql://Dirac:corent@127.0.0.1/testDiracDB', echo =True )
DBSession = sessionmaker(engine )
Base.metadata.create_all(engine)
def insert():
session = DBSession()
p = Parent()
c = Child()
c1 = brother()
b = Baby()
d = Dog()
d2 = Dog()
c.babies.append(b)
p.children.append(c)
p.dog = d
p.dog2 = d2
session.add(p)
session.commit()
session.close()
def getFromDB():
session = DBSession()
d_alias = aliased(Dog)
d2_alias = aliased(Dog)
query = session.query( Parent )
rows = query.all()
session.expunge_all()
session.close()
return rows
insert()
rows = getFromDB()
for parent in rows:
print "parent %s dog %s cat %s"%(parent.id, parent.dog.id if parent.dog else '',parent.cat.id if parent.cat else '')
for child in parent.children:
print " child %s"%child.id
for baby in child.babies:
print " baby %s"%baby.id