Mybatis 操作续集2(结合上文)

news2025/2/25 14:22:06

Mybatis 是一个持久层框架,用于简化数据库的操作,和Spring 没有任何关系,我们现在能使用它是因为 Spring Boot 把Mybatis 的依赖给引入进来了,在 pom.xml 里面

Mybatis 如何进行重命名?

看最后两行代码,这样就能重命名了

package com.example.mybatisdemo.mapper;

import com.example.mybatisdemo.model.UserInfo;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;

import java.util.List;

@Mapper
public interface UserInfoMapper {
    @Select("select * from userInfo")
    List<UserInfo> selectAll();

    @Select("select * from userInfo where id = #{id}")
    UserInfo selectOne(Integer id);

    @Select("select * from userInfo where id= #{userId}")
    UserInfo selectOne2(@Param("userId")Integer id);
}

Mybatis 的增操作

package com.example.mybatisdemo.mapper;

import com.example.mybatisdemo.model.UserInfo;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;

import java.util.List;

@Mapper
public interface UserInfoMapper {
    

    @Insert(" insert into userinfo(username,password,age,gender,phone) " +
            "value(#{username},#{password},#{age},#{gender},#{phone})")
    Integer insert(UserInfo userInfo);

}

依旧是右键,generate ,test,勾选,OK

package com.example.mybatisdemo.mapper;

import com.example.mybatisdemo.model.UserInfo;
import lombok.extern.slf4j.Slf4j;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.List;

import static org.junit.jupiter.api.Assertions.*;

@Slf4j
@SpringBootTest
class UserInfoMapperTest {
    @Autowired
    private UserInfoMapper userInfoMapper;
    

    @Test
    void insert() {
        UserInfo userInfo = new UserInfo();
        userInfo.setUsername("zhaoliu");
        userInfo.setPassword("123");
        userInfo.setAge(45);
        userInfo.setGender(0);
        userInfo.setPhone("1775423");

        Integer result = userInfoMapper.insert(userInfo);
        log.info("insert 方法,执行结果:{}",result);
    }
}

就能看到运行结果了