mybaits-plus 实现增删改查_studentmapper.updatebyid(s)>0-优快云博客

本文展示了如何使用MyBatisGenerator插件生成Mapper、Service和实体类，并提供了测试用例，包括查询所有用户、插入、更新和删除操作。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

数据库表（student）如下：

使用 mybaits generator插件生成 mapper，service，和实体类

目录结构如下：

StudentMapper中代码

@Repository
public interface StudentMapper extends BaseMapper<Student> {
}

StudentService中代码

public interface StudentService extends IService<Student> {
}

StudentServiceImpl中代码

@Service
public class StudentServiceImpl extends ServiceImpl<StudentMapper, Student> implements StudentService {
}

编写测试类

@Autowired
    private StudentMapper studentMapper;
@Test
    void contextLoads() {
        //c查询全部用户
        //参数是一个wrapper
      List student =  studentMapper.selectList(null);
      student.forEach(System.out::println);
        }

        //插入信息
    @Test
    public void testInsert(){
        Student student = new Student();
        student.setName("jiang");
        student.setPassword(("1234j"));
        int result = studentMapper.insert(student);
        System.out.println(result);
        System.out.println(student);
    }
    //更新信息
     @Test
    public void testUpdate(){
        Student student = new Student();
        student.setId(3);
        student.setName("123");
        
        int i = studentMapper.updateById(student); //通过条件拼接sql语句
        System.out.println(i);

     }
     //删除信息
    @Test
    public void testdelete(){
    
        int i=4;
        studentMapper.deleteById(i);
        //System.out.println(student);
    }