当我们遇到以下报错：
Description:
Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.
Reason: Failed to determine a suitable driver class
Action:
Consider the following:
?? ?If you want an embedded database (H2, HSQL or Derby), please put it on the classpath.
?? ?If you have database settings to be loaded from a particular profile you may need to activate it (no profiles are currently active).
?
如果不想使用数据库功能，可以这样配置：
application.yml：?
spring:
autoconfigure:
exclude: org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration