Springboot Failed to configure a DataSource: ‘url‘ attribute is not specified and no embedded

Posted 2022-12-03 悟能的师兄

一. 异常现象

我在Spring Boot中关联mysql、Mybatis进行数据库开发时，按照正常步骤添加了相关数据库的依赖，也进行了必要的数据库配置，结果在项目启动时出现如下异常信息：

***************************
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).
 
 
Process finished with exit code 1

看提示信息是说当前项目没有配置DataSource相关的配置！

二. 异常原因
其实这个异常在SpringBoot中是一个比较常见的异常，一般是因为SpringBoot自动配置时，检测到我们添加了MySQL、Oracle、Mybatis等和数据库相关的依赖包，结果我们的配置文件中却没有添加数据库相关的配置，比如：

spring:
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/db?characterEncoding=utf-8
    username: root
    password: root

三. 解决办法
针对以上原因造成的异常，可以采用如下办法解决：

方式一：在application.yml/applicaiton.properties中添加数据库相关配置；
方式二：在SpringBootApplication注解中进行数据库配置的排除，即@SpringBootApplication(exclude= DataSourceAutoConfiguration.class)。