flask中config

def get_db_uri(dbinfo):
    ENGINE = dbinfo.get("ENGINE") or 'mysql'
    DRIVER = dbinfo.get("DRIVER") or "pymysql"
    USER = dbinfo.get("USER") or "root"
    PASSWORD = dbinfo.get("PASSWORD") or "cjsoft100"
    HOST = dbinfo.get("HOST") or "cdb-pi42xze4.bj.tencentcdb.com"
    PORT = dbinfo.get("PORT") or "10091"
    NAME = dbinfo.get("NAME") or "develop"

    print("{}+{}://{}:{}@{}:{}/{}".format(ENGINE, DRIVER, USER, PASSWORD, HOST, PORT, NAME))
    return "{}+{}://{}:{}@{}:{}/{}".format(ENGINE, DRIVER, USER, PASSWORD, HOST, PORT, NAME)


class Config:

    DEBUG = False

    TESTING = False

    SECRET_KEY = "dsgsdhsa"

    SQLALCHEMY_TRACK_MODIFICATIONS = False


class DevelopConfig(Config):

    DEBUG = True

    DATABASE = {
        "ENGINE": "mysql",
        "DRIVER": "pymysql",
        "USER": "root",
        "PASSWORD": "123456",
        "HOST": "127.0.0.1",
        "PORT": "3306",
        "NAME": "shop"
    }

    SQLALCHEMY_DATABASE_URI = get_db_uri(DATABASE)


class TestingConfig(Config):

    TESTING = True

    DATABASE = {
        "ENGINE": "mysql",
        "DRIVER": "pymysql",
        "USER": "root",
        "PASSWORD": "cjsoft100",
        "HOST": "cdb-pi42xze4.bj.tencentcdb.com",
        "PORT": "10091",
        "NAME": "shop"
    }

    SQLALCHEMY_DATABASE_URI = get_db_uri(DATABASE)


class StagingConfig(Config):

    DATABASE = {
        "ENGINE": "mysql",
        "DRIVER": "pymysql",
        "USER": "root",
        "PASSWORD": "cjsoft100",
        "HOST": "cdb-pi42xze4.bj.tencentcdb.com",
        "PORT": "10091",
        "NAME": "shop"
    }

    SQLALCHEMY_DATABASE_URI = get_db_uri(DATABASE)


class ProductConfig(Config):

    DATABASE = {
        "ENGINE": "mysql",
        "DRIVER": "pymysql",
        "USER": "root",
        "PASSWORD": "cjsoft100",
        "HOST": "cdb-pi42xze4.bj.tencentcdb.com",
        "PORT": "10091",
        "NAME": "shop"
    }

    SQLALCHEMY_DATABASE_URI = get_db_uri(DATABASE)


envs = {
    "develop": DevelopConfig,
    "testing": TestingConfig,
    "staging": StagingConfig,
    "product": ProductConfig,
    "default": DevelopConfig
}

　其实最终是把数据库的一些账号密码写成类的形式：

class Config:

    DEBUG = False

    TESTING = False

    SECRET_KEY = "dsgsdhsa"

    SQLALCHEMY_TRACK_MODIFICATIONS = False
    
    SQLALCHEMY_DATABASE_URI = "{}+{}://{}:{}@{}:{}/{}".format(ENGINE, DRIVER, USER, PASSWORD, HOST, PORT, NAME)

　　然后用app.config.from_object(Config)

from flask import Flask

class Config:
    DEBUG = False

    TESTING = False

    SECRET_KEY = "dsgsdhsa"

    SQLALCHEMY_TRACK_MODIFICATIONS = False

    SQLALCHEMY_DATABASE_URI = "{}+{}://{}:{}@{}:{}/{}".format(ENGINE, DRIVER, USER, PASSWORD, HOST, PORT, NAME)


def create_app(Config):
    app = Flask(__name__)
    # 用from_object方法写入配置类
    app.config.from_object(Config)

    return app

create_app(Config)