如何通過 Python 中的 YAML 配置文件檢查與數據庫的連接？

Question

我有項目需要一個 YAML 配置文件來檢查與數據庫的連接，我有一些問題：如果特定於主機的沒有，它將自動成為默認值（本地主機）。 我已經用示例文件對其進行了測試

下面，但似乎我的代碼有問題，主機在為空時不會將默認值顯示為 loacalhost ，否則不顯示。 任何人都可以給我建議嗎？ 我哪里錯了？

我的示例文件 data_source.yml：

database: 

dbopt:
   host: 
   port: 5432
   dbname: db1
   user: username
   password: 1234
   client_encoding: utf-8
   connect_timeout: 60
   sslmode: none

query:
   select * from manufacturing_product

query:
   select * from manufacturing_product

我的代碼：

import yaml

class InvalidConfigError(Exception):
    pass

class DB:
    def __init__(self, dbconf):
        self._dbconf = dict(dbconf)

        # checking for database type
        dbtype = self.get_db_type()
        if dbtype != 'sqlite' and dbtype != 'postgres':
            raise InvalidConfigError(
                'E01001', 'Invalid database type, should be sqlite or postgres.')
        else:
            self.dbtype = dbtype

        #checking db option
        dbopt = self.__get_dbopt()
        if dbopt is None:
            raise InvalidConfigError(
                'E01002', 'Invalid database options.')
        else:
            self.dbopt = dbopt

        #checking host
        host = dbopt.get('host')
        if host is None or len(host) <= 0:
            self.host = 'localhost'
        else:
            self.host = host

        #checking dbname
        dbname = dbopt.get('dbname')
        if dbname is None or len(dbname) <= 0:
            raise Exception("Database name is required.")
        else:
            self.dbname = dbname

    def get_db_type(self):
        return self._dbconf['db']

    def __get_dbopt(self):
        return self._dbconf.get('dbopt')

    def get_db_host(self):
        return self.host

    def get_db_name(self):
        return self.dbname

with open('data_source.yml') as file:
    data = yaml.full_load(file)

    for item, doc in data.items():
        print(item, ":", doc)

    db = DB(data)

輸出：

database: 

dbopt:
   host: 
   port: 5432
   dbname: db1
   user: username
   password: 1234
   client_encoding: utf-8
   connect_timeout: 60
   sslmode: none

query:
   select * from manufacturing_product

Answer 1

您的代碼很好，只是您沒有正確檢索它，我檢查並獲得了主機值為“localhost”

with open('data_source.yml') as file:
data = yaml.full_load(file)

for item, doc in data.items():
    print(item, ":", doc)

db = DB(data)

print("default host value:", db.get_db_host()) # added to test default host value 

輸出：

    db : postgres
dbopt : {'host': 'None', 'port': 1234, 'dbname': 'xyz', 'user': 'abc', 'password': 'pass', 'client_encoding': 'utf-8', 'connect_timeout': 100, 'sslmode': 'none'}
insopt : {'table': 'tries', 'out': 'qubna', 'bl': 'tghqua'}