SQLAlchemy-Utils

由于sqlalchemy中没有提供choice方法,所以借助SQLAlchemy-Utils组件提供的choice方法。

安装:

pip3 install sqlalchemy_utils

示例:

from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import Column
from sqlalchemy import Integer, String
from sqlalchemy import create_engine
from sqlalchemy_utils import ChoiceType

Base = declarative_base()


class UserInfo(Base):
    __tablename__ = "userinfo"

    id = Column(Integer, primary_key=True)
    name = Column(String(16), index=True, unique=True, nullable=False, autoincrement=True)
    gender_choices = (
        (0, ""),
        (1, ""),
        (2, "保密")
    )
    gender = Column(ChoiceType(gender_choices, Integer()))

    __table_args__ = {
        "mysql_engine": "Innodb",
        "mysql_charset": "utf8",
    }


def init_db():
    """根据类创建数据库表"""
    engine = create_engine(
        "mysql+pymysql://root:""@127.0.0.1:3306/sqlalchemy_db?charset=utf8",
        max_overflow=0,  # 超过连接池大小外最多创建的连接
        pool_size=5,     # 连接池大小
        pool_timeout=20, # 池中没有连接最多等待的时间,否则报错
        pool_recycle=-1  # 多久之后对线程池中的线程进行一次连接的回收(重置)
    )
    Base.metadata.create_all(engine)


def drop_db():
    """根据类删除数据库表"""
    engine = create_engine(
        "mysql+pymysql://root:""@127.0.0.1:3306/sqlalchemy_db?charset=utf8",
        max_overflow=0,
        pool_size=5,
        pool_timeout=20,
        pool_recycle=-1
    )
    Base.metadata.drop_all(engine)


if __name__ == "__main__":
    drop_db()
    init_db()
models.py
from models import UserInfo
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker

engine = create_engine(
    "mysql+pymysql://root:""@127.0.0.1:3306/sqlalchemy_db?charset=utf8",
    max_overflow=0,  # 超过连接池大小外最多创建的连接
    pool_size=5,     # 连接池大小
    pool_timeout=20, # 池中没有连接最多等待的时间,否则报错
    pool_recycle=-1  # 多久之后对线程池中的线程进行一次连接的回收(重置)
)
SessionFactory = sessionmaker(bind=engine)
session = SessionFactory()

ret = session.query(UserInfo).all()
for row in ret:
    print(row.id, row.name, row.gender.value)
# 1 pd 男
# 2 pq 保密
View Code

 

posted @ 2019-02-03 22:50  就俗人一个  阅读(2044)  评论(0编辑  收藏  举报