实际上，您几乎可以获得正确的连接字符串，但是使用了错误的前置字符串.您可以参考此文档的更多详细信息:

Actually you are almost get the right the connection string, however you use the wrong prepended string. Further more detailed information you could refer to this doc:Configure connection strings.

使用哪个字符串取决于您选择的类型，例如在我的测试中，我使用自定义类型.然后我应该使用os.environ['CUSTOMCONNSTR_testconnectionstring']来获取值.

Which string to use it depends on which type you choose, like in my test I use a custom type. Then I should use os.environ['CUSTOMCONNSTR_testconnectionstring'] to get the value.

从文档中您可以找到以下类型:

From the doc you could find there are following types:

• SQL Server:SQLCONNSTR _
• MySQL:MYSQLCONNSTR _
• SQL数据库:SQLAZURECONNSTR _
• 自定义:CUSTOMCONNSTR _