Description: Failed to configure a DataSource: ‘url‘ attribute is not specified and报错的原因

问题描述：

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APPLICATION FAILED TO START
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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

问题分析及解决方案 问题原因:

Mybatis没有找到合适的加载类,其实是大部分spring - datasource -
url没有加载成功,分析原因如下所示.

DataSourceAutoConfiguration会自动加载.

没有配置spring - datasource - url 属性.

spring - datasource - url 配置的地址格式有问题.

配置 spring - datasource - url的文件没有加载.

在网上给出了几种解决方案：
方案一 (解决原因1)
排除此类的autoconfig。启动以后就可以正常运行。

@SpringBootApplication(exclude= {DataSourceAutoConfiguration.class})

很完美没有在报错了：

方案二 (解决原因2)
在application.properties/或者application.yml文件中没有添加数据库配置信息.

spring:
  datasource:
    url: jdbc:mysql://localhost:3306/sys?useUnicode=true&characterEncoding=UTF-8&useSSL=false
    username: root
    password: 123
    driver-class-name: com.mysql.jdbc.Driver

以上都能解决的问题，我在网络上找的，这两种的话会常用点，所以写上来了。