SpringBoot集成MyBatis时报了如下错误：
APPLICATION FAILED TO START
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).
问题原因及解决方法：
- 项目中引入了MyBatis的依赖，SpringBoot会根据引入的依赖自动配置项目，如果我们在项目中使用了nacos等配置中心组件的话，数据库配置项就不是明文写在项目配置文件中了，这是需要排除DataSourceAutoConfiguration这个类的自动配置。
在启动类中添加如下注解：
@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class})
