1、SpringBoot集成MyBatis

news2025/3/29 9:48:54

（1）创建SpringBoot项目

（2）集成MyBatis

导入坐标

<!-- 连接数据库，版本5 -->
<dependency>
  <groupId>mysql</groupId>
  <artifactId>mysql-connector-java</artifactId>
  <version>5.1.32</version>
</dependency>

<!-- 连接数据库，版本8 -->
<dependency>
  <groupId>mysql</groupId>
  <artifactId>mysql-connector-java</artifactId>
  <version>8.0.23</version>
</dependency>

<!-- mybatis -->
<dependency>
  <groupId>org.mybatis.spring.boot</groupId>
  <artifactId>mybatis-spring-boot-starter</artifactId>
  <version>2.2.0</version>
</dependency>

配置yam文件

# 连接数据库
spring:
  datasource:
    url: jdbc:mysql://localhost:3306/zzutwo?useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&useSSL=false&zeroDateTimeBehavior=convertToNull&useTimezone=true&serverTimezone=GMT%2B8&allowMultiQueries=true
    # 兼容以前的配置，${}可以获取对应变量的值
    jdbc-url: ${spring.datasource.url}
    username: root
    password: root
    driver-class-name: com.mysql.jdbc.Driver
    # MySql 8.0以上版本
    # driver-class-name: com.mysql.cj.jdbc.Driver
# MyBatis
mybatis:
  # 指定MyBatis的Mapper XML文件位置
  mapper-locations: classpath:mapper/*.xml
  configuration:
    # 将mybatis的日志输出在控制台
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
    # 开启下划线字段自动映射为驼峰命名
    map-underscore-to-camel-case: true

编写Mapper接口

@Mapper  // 标识该接口是操作数据库的接口，会自动生成实现类的代理对象，交给容器管理
public interface UserMapper {
    
    public List<User> getUser();
    
}

编写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.zzu.mapper.UserMapper">

  <select id="getUser" parameterType="com.hkd.spingbootweb.entity.User" resultType="com.zzu.pojo.User">
    select * from user where id = #{id}
  </select>
</mapper>

编写Service

public interface UserService {
    public List<User> getUser();
}

编写Service实现类

@Service
public class UserServiceImpl implements UserService {
    @Autowired
    UserMapper userMapper;

    @Override
    public List<User> getUser(){
        return userMapper.getUser();
    }

}

编写Controller

@CrossOrigin // 允许跨域访问
@ResponseBody // 使用JSON格式返回数据
@Controller
@RequestMapping("/user")
public class UserController {

    @Value("${spring.datasource.url}")
    private String url;

    @Autowired
    UserService userService;

    @GetMapping("/deltm")
    public void deltm(@RequestParam int id) {
        Tm tm = new Tm();
        tm.setId(id);
        userService.deleteTmById(tm);
    }
}

测试

@SpringBootTest
@Slf4j
class ZzuServerApplicationTests {

    @Autowired  // 自动注入该接口的实现类对象
    UserService userService;
    
    @Test
    void testMybatis(){
        List<User> list = userService.getUser();
        list.stream().forEach(user -> log.info(user.toString()));
    }
}