No supported DataSource type found
具体如下：

Caused by: java.lang.IllegalStateException: No supported DataSource type found
	at org.springframework.boot.jdbc.DataSourceBuilder.getType(DataSourceBuilder.java:146) ~[spring-boot-2.0.4.RELEASE.jar:2.0.4.RELEASE]
	at org.springframework.boot.jdbc.DataSourceBuilder.build(DataSourceBuilder.java:74) ~[spring-boot-2.0.4.RELEASE.jar:2.0.4.RELEASE]
	at com.yydrobot.serverdao.config.DataSourceInformationConfig.masterDataSource(DataSourceInformationConfig.java:56) ~[classes/:na]
	at com.yydrobot.serverdao.config.DataSourceInformationConfig$$EnhancerBySpringCGLIB$$c870be7.CGLIB$masterDataSource$0(<generated>) ~[classes/:na]
	at com.yydrobot.serverdao.config.DataSourceInformationConfig$$EnhancerBySpringCGLIB$$c870be7$$FastClassBySpringCGLIB$$1cd5e2c4.invoke(<generated>) ~[classes/:na]
	at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228) ~[spring-core-5.0.8.RELEASE.jar:5.0.8.RELEASE]
	at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:361) ~[spring-context-5.0.8.RELEASE.jar:5.0.8.RELEASE]
	at com.yydrobot.serverdao.config.DataSourceInformationConfig$$EnhancerBySpringCGLIB$$c870be7.masterDataSource(<generated>) ~[classes/:na]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_201]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_201]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_201]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_201]
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.0.8.RELEASE.jar:5.0.8.RELEASE]
	... 29 common frames omitted

原因：缺少依赖

        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.1</version>
        </dependency>

添加上述依赖后，问题得到解决.

springboot版本2.0.4， mybatis的依赖

        <!-- Mybatis -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.1</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.6</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>5.1.38</scope>
        </dependency>