首先是必须引入的：

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>

mysql:

pom.xml配置：

<!--mysql数据库的依赖包-->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <scope>runtime</scope>
</dependency>

application配置：

#mysql数据库连接配置
spring.datasource.url = jdbc:mysql://localhost:3306/xiaomi_qbms?useUnicode=true&characterEncoding=utf-8&serverTimezone=UTC
spring.datasource.username = root
spring.datasource.password =

sqlserver:

①需先导入jar包：

选择要导入的sqljdbc4的jar包，OK完成。

选择到 jar包下载到本地的位置、

②pom.xml配置：

<!-- sqlserver数据库的依赖包 -->
<dependency>
    <groupId>com.microsoft.sqlserver</groupId>
    <artifactId>sqljdbc4</artifactId>
</dependency>

③application文件配置：

#sqlserver数据库连接配置 spring.datasource.url = jdbc:sqlserver://localhost:1433;database=iMatrix6.5RC3.p4;integratedSecurity=false; spring.datasource.username = sa spring.datasource.password = sa

oracle:

第①步同sqlserver.

②pom.xml配置：

<!-- oracle数据库的依赖包 -->
<dependency>
    <groupId>com.oracle</groupId>
    <artifactId>ojdbc6</artifactId>
</dependency>

③application文件配置：

#oracle数据库连接配置
spring.datasource.url = jdbc:oracle:thin:@localhost:1522:orcl11g
spring.datasource.username = viewshine_qis
spring.datasource.password = viewshine_qis