1、Spring Boot项目添加MyBatis依赖和Oracle驱动：
<dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.3.2</version> </dependency> <dependency> <groupId>com.oracle</groupId> <artifactId>ojdbc6</artifactId> <version>11.2.0.1.0</version> </dependency>
2、配置application.properties：
#spring.datasource.driver-class-name=com.mysql.jdbc.Driver #spring.datasource.url=jdbc:mysql://localhost:3306/ems #spring.datasource.username=root #spring.datasource.password=root mybatis.mapper-locations=classpath:/com/example/demo/mapper/*.xml server.port=9090 spring.datasource.driver-class-name=oracle.jdbc.driver.OracleDriver spring.datasource.url=jdbc:oracle:thin:@134.32.9.247:1700/mbss spring.datasource.username=dbrtadm spring.datasource.password=dbrtadm
3、新建实体类，注意与数据库字段对应：
package com.example.demo.entity; import lombok.Getter; import lombok.Setter; @Getter @Setter public class User { public int id; public String order_id; } 4、新建mapper（xml）：
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" > <mapper namespace="com.example.demo.dao.UserMapper"> <select id = "listUser" resultType="com.example.demo.entity.User"> select * from t_ps_order_qr </select> </mapper>
5、新建dao接口：
package com.example.demo.dao; import java.util.List; import org.apache.ibatis.annotations.Mapper; @Mapper public interface UserMapper { public List listUser(); } 此处应加@Mapper注解，interface的方法名对应xml的标签id。
6、新建controller：
package com.example.demo.controller; import java.util.List; import javax.annotation.Resource; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RestController; import com.example.demo.dao.UserMapper; @RestController public class TestController { @Resource UserMapper um; @GetMapping("/listu") public List listUser() { return um.listUser(); } } 启动主程序，浏览器访问http://localhost:9090/listu,
注意oracle驱动版本问题，版本不对可能会报错
。
需要连接MySQL只需将驱动和URL更改为MySQL的即可，其余与Oracle相同。
如有错误欢迎指正。