springboot 启动报错

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
09:49:59 [main] ERROR o.s.b.d.LoggingFailureAnalysisReporter - 

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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 (the profiles dev are currently active).

浏览网上的文档都没有解决，不过也给了我解决的思路，此报错无非是数据源配置的原因，主要就是两块，一块是jar包引用，另一块就是数据源配置属性，地址是否正确，我的报错是因为jar包未引用的原因，引用以下jar包就解决了！

<!--多数据源支持-->
<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>dynamic-datasource-spring-boot-starter</artifactId>
    <version>2.4.2</version>
</dependency>
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid-spring-boot-starter</artifactId>
    <version>1.1.21</version>
    <scope>compile</scope>
</dependency>
<!-- 数据库连接池 -->
<dependency>
    <groupId>com.mchange</groupId>
    <artifactId>c3p0</artifactId>
    <version>0.9.5.2</version>
</dependency>
<dependency>
    <groupId>com.microsoft.sqlserver</groupId>
    <artifactId>mssql-jdbc</artifactId>
    <version>7.4.1.jre8</version>
</dependency>
<dependency>
    <groupId>com.microsoft.sqlserver</groupId>
    <artifactId>sqljdbc4</artifactId>
    <version>4.0</version>
</dependency>