from sqlalchemy import *
from datetime import datetime
from sqlalchemy.orm import declarative_base,sessionmaker

db_url = "mysql+pymysql://root:123456@127.0.0.1:3306/ai0824_stu?charset=utf8"

engine = create_engine(db_url, pool_size=100,echo=False)

Base = declarative_base()

class Employment(Base):
    __tablename__ = 's_employment'
    id = Column(Integer
                , primary_key=True
                , autoincrement=True
                , comment='编号,自增主键')
    stu_id = Column(String(20)
                  # , ForeingKey('s_student.stu_id')
                  , unique=True
                  , nullable=True
                  , comment='学生学号，唯一')
    class_name = Column(String(32))
    company = Column(String(100))
    salary = Column(Integer
                    , default=0)
    open_date = Column(DATETIME
                     , default=datetime.now())
    offer_date = Column(DATETIME
                     , default=datetime.now())
    work_date = Column(DATETIME
                     , default=datetime.now()
                     , onupdate=datetime.now)
    is_delete = Column(Integer
                   , default=0
                     )


Session = sessionmaker( bind = engine, autoflush = False, autocommit = False )

def get_db():
    db = Session()
    try:
        yield db
    finally:
        db.close()