python simple and small ORM Peewee(矮小的) 入门篇

Posted 2020-10-21 whatistest

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python ORM 多种多样，如：Django ORM , SQLAlchemy , SqlObject , 今天我们来介绍一款小巧精悍框架，支持的数据库: sqlite,mysql,postgresql , 支持的Python版本: 2.6+ and 3.2+
官方文档链接

1. 安装peewee

pip
pip install peewee

source install

git clone https://github.com/coleifer/peewee.git
cd peewee
python setup.py install

2. hello world

hello_world.py


from peewee import *

DB = SqliteDatabase(‘helloworld.db‘)

class BaseModle(Modle):
    """
    基础模型

    """
    class Meta():
        database = DB

class HelloWorld(BaseModle):
    """
    hello world模型
    peewee模型及数据库表，表及模型
    """
    hwid = PrimaryKeyField(unique=True)
    hwcontent = CharField()

    @classmethod
    def save_info(cls, hw_content):
        """
            保存数据
        ""
        HelloWorld(hwcontent=hw_content).save()

    @classmethod
    def select_info(cls, hw_content=None):
        """
            查询数据
        """
        if hw_content:
            cls.select().where(HelloWorld.hwcontent == hw_content)
        else:
            cls.select()

test_hello_world.py

from hello_world import DB, HelloWorld


def db_test():
    DB.create_tables([HelloWorld], safe=True)
    HelloWorld.save_info(‘hello world my peewee.‘)

if __name__ == ‘__main__‘:
    db_test()
    for hw in HelloWorld.select_info():
        print(hw.hwcontent)

done
重点理解peewee vs database 关系表

Thing	Corresponds to…
Model	Database table
Field instance	Column on a table
Model instance	Row in a database table