记一次项目Git下来以后，启动报错

报错内容如下：

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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).

解决方法：

IDEA中，右上角有一个如下红框中的按钮

进行如下四步操作

原因大概解释就是项目在Git下来以后，resources包中的配置文件并没有正常加载加载，上面四步的操作就是为了让配置文件重新加载