SpringBoot连接MYSQL数据库并使用JPA进行操作

<!--数据库相关配置-->     <dependency>       <groupId>org.springframework.boot</groupId>       <artifactId>spring-boot-starter-web</artifactId>     </dependency>     <dependency>       <groupId>org.springframework.boot</groupId>       <artifactId>spring-boot-starter-data-jpa</artifactId>     </dependency>     <dependency>       <groupId>mysql</groupId>       <artifactId>mysql-connector-java</artifactId>     </dependency>     <dependency>       <groupId>org.apache.poi</groupId>       <artifactId>poi</artifactId>       <version>3.11</version>     </dependency>