springboot02之整合mybatis

目录
  • 1.1 springboot整合mybatis

1.1 springboot整合mybatis

这里采用的是IDEA演示,生成后的目录是这样的:
springboot02之整合mybatis_第1张图片
关于项目结构这里要注意的是:所有包必须于springboot启动类处于同一包下或者都位于springboot的子包下,这样springboot才会扫描到容器里的各个组件!

编写实体类user:

public class User {
    private Long id;//编号
    private String username;//用户名
    private String password;//密码

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                '}';
    }

    public Long getId() {
        return id;
    }

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

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}

熟悉mybatis的应该知道面向接口编程,所以创建一个mapper包放主要方法与UserMapper.xml对应

UserMapper:

@Mapper
public interface UserMapper {
    List findAll();
}

@Mapper注解目的就是为了不再写mapper映射文件,从mybatis3.4.0开始加入了@Mapper注解。指定该接口是用来操作数据库的,但是实际开发中注解少用,更多的还是使用xml配置文件。

编写service层userservice:

public interface UserService {
    List findAll();
}

实现该服务userserviceImp:

@Service("userService")
public class UserServiceImp implements UserService {
    @Autowired
    private UserMapper userMapper;
    @Override


    public List findAll() {
        return userMapper.findAll();
    }
}

接下来在application.yml中配置数据源:

server:
  port: 8080
spring:
  #数据库连接配置
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/mybatis?characterEncoding=utf-8&useSSL=false&serverTimezone=UTC
    username: root
    password: xhj970829

#mybatis的相关配置
mybatis:
  #mapper配置文件
  mapper-locations: classpath:mapper/*.xml
  type-aliases-package: com.example.sprintboot_mybatis.entity
  #开启驼峰命名
  configuration:
    map-underscore-to-camel-case: true

编写一个controller测试一下:

@RestController
@RequestMapping("/user")
public class UserController {
    @Autowired
    private UserService userService;

    @RequestMapping("/findAll")
    public List findAll(){
        return userService.findAll();
    }




}

运行并访问localhost:8080/user/findAll

springboot02之整合mybatis_第2张图片

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