建立專案

新建專案，選擇SpringIntializr,建立方式選擇spring官方連結即可。(點開此連結也可以線上建立專案)

連線資料庫跑通測試

建立實體

public class UserEntity {
    private long id;
    private String name;
    private String code;

    public
 
 long getId() {
        return id;
    }

    public void setId(long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getCode() {
        return code;
    }

    public
 
 void setCode(String code) {
        this.code = code;
    }
}
複製程式碼

建立dao

@Repository
public interface UserDao {
    @Select("select * from t_user")
    @Results({
            @Result(property = "name",column = "name"),@Result(property = "code",column="code")
    })
    List<UserEntity> getAll
 
();
}
複製程式碼

建立controller

@RestController
@RequestMapping("/user")
public class UserController {
    @Autowired
    private UserDao userDao;

    @RequestMapping("/getAll")
    public List<UserEntity> getAll() {
        return userDao.getAll();
    }
}
複製程式碼

在Demo9Application檔案中中新增@MapperScan("com.example.demo9.dao")用於掃描dao，可以避免每個dao都去新增mapper註解了

@MapperScan("com.example.demo9.dao")
@SpringBootApplication
public class Demo9Application {

    public static void main(String[] args) {
        SpringApplication.run(Demo9Application.class,args);
    }

}
複製程式碼

配置application.properties

#datasource
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test?useSSL=false
spring.datasource.username=root
spring.datasource.password=testtest
複製程式碼

現在專案就配置完了，具體目錄結構如下：