SQLAlchemyPython 数据持久层框架

SQLAlchemy 是一个Python 的SQL 工具包以及数据库对象映射框架。它包含整套企业级持久化模式，专门为高效和高性能的数据库访问。

示例代码：

from sqlalchemy import Column, DateTime, String, Integer, ForeignKey, func
from sqlalchemy.orm import relationship, backref
from sqlalchemy.ext.declarative import declarative_base
 
Base = declarative_base()
 
class Department(Base):
    __tablename__ = 'department'
    id = Column(Integer, primary_key=True)
    name = Column(String)
 
class Employee(Base):
    __tablename__ = 'employee'
    id = Column(Integer, primary_key=True)
    name = Column(String)
    # Use default=func.now() to set the default hiring time
    # of an Employee to be the current time when an
    # Employee record was created
    hired_on = Column(DateTime, default=func.now())
    department_id = Column(Integer, ForeignKey('department.id'))
    # Use cascade='delete,all' to propagate the deletion of a Department onto its Employees
    department = relationship(
        Department,
        backref=backref('employees',
                         uselist=True,
                         cascade='delete,all'))
 
from sqlalchemy import create_engine
engine = create_engine('sqlite:///orm_in_detail.sqlite')
 
from sqlalchemy.orm import sessionmaker
session = sessionmaker()
session.configure(bind=engine)
Base.metadata.create_all(engine)