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报错内容：
Description:
Failed to auto-configure a DataSource: 'spring.datasource.url' is not specified and no embedded datasource could be auto-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).
报错原因：
由于idea项目在初始化spring initializr时，勾选了数据库，但是项目在刚开始的时候还没建立数据库，所以spring boot找不到数据库配置报错。
临时解决方案：
查阅其他大神博客后
在项目启动类的@SpringBootApplication中添加
exclude={DataSourceAutoConfiguration.class}
