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).
原因：
SpringBoot默认会加载org. springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration类；
DataSourceAutoConfiguration类使用了@Configuration注解向spring注入了dataSource bean；
因为工程中没有关于dataSource相关的配置信息，当Spring创建dataSource bean因缺少相关的信息就会报错。
解决：
在启动类注解后加上： @SpringBootApplication(exclude = {DataSourceAutoConfiguration.class, HibernateJpaAutoConfiguration.class})
若不提示导包，可直接copy：
import org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration;
再次启动即可。
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