技術標籤：spring資料庫

編寫application.yml檔案

server:
  port: 5001

spring:
  application:
    name: config-server
  profiles:
    active: jdbc

  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://127.0.0.1:3306/ordertest?useUnicode=true&characterEncoding=utf-8&serverTimezone=
 
Asia/Shanghai
    username: root
    password: root

pom檔案

        <!--連線資料庫相關的jar包-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
 

            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <dependency>
            <groupId>io.mateu</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
 

啟動類

@SpringBootApplication
public class ConfigServerApplication {
    public static void main(String[] args) {
        SpringApplication.run(ConfigServerApplication.class, args);
    }

}

Entity層

@Getter
@Setter
public class Student {
    private int id;
    private String name;
}

Dao層

public interface StudentDao {
    public String getUserNameById(int id);
}

@Repository
public class StudentDaoImpl implements StudentDao {
	// 用Autowired也行
	// @Resource的作用和@Autowired一樣，只不過@Autowired是按byType自動注入，而@Resource預設按byName自動注入
    @Resource
    private JdbcTemplate jdbcTemplate;


    @Override
    public String getUserNameById(int id) {
        return jdbcTemplate.queryForObject("select name from student where id=? ", String.class);
    }

}

Service層

public interface StudentService {
    public String getUserNameById(int id);
}

@Service
public class StudentServiceImpl implements StudentService {
    @Resource
    private StudentDao studentDao;

    @Override
    public String getUserNameById(int id) {
        return studentDao.getUserNameById(id);

    }
}

Controller層

@RestController
@RequestMapping("/mydb")
public class StudentController {

    @Resource
    private StudentService studentService;

    @GetMapping("/hello")
    public String getUserNameById(int id){
        return studentService.getUserNameById(id);
    }

}

測試