在一次新建项目时，启动后报出错误

Consider the following:
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).

研究了一会之后发现，根本原因是我在pom中添加了mybaits，但我的配置文件中又没写数据源，没有配置数据库。

解决方案：
一.pom中把mybaits注释后，刷新pom，可以正常启动

<!--        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.2.2</version>
        </dependency>-->

二.在yml或properties这类配置文件中，添加数据库datasource参数

spring:
  datasource:
    # 驱动名称
    driver-class-name: com.mysql.cj.jdbc.Driver
    # 数据库地址
    url: jdbc:mysql://127.0.0.1:3306/demo
    # 用户名
    username: root
    # 密码
    password: 123456

三.启动类上添加 exclude={DataSourceAutoConfiguration.class}

@EnableAutoConfiguration(exclude={DataSourceAutoConfiguration.class})