Mybatis-Plus条件构造器select方法返回指定字段方式

public ajaxResult listAll(ProjectBuild projectBuild) {
    //只返回了id和name两个字段    
    List<Map<String,Object>> list = this.iProjectBuildService.listMaps(
           Wrappers.lambdaQuery(projectBuild).select(ProjectBuild::getBuildId,ProjectBuild::getBuildName)
           .orderByAsc(ProjectBuild::getBuildId)
           // 以上select表示要返回的字段,
    );
    return AjaxResult.success(list);
}

@Test
public void selectByQueryWrapper8(){
    QueryWrapper<Employee> queryWrapper=new QueryWrapper();
 
    queryWrapper.lambda()
             .select(Employee.class,fieldInfo->!fieldInfo.getColumn().equals("birthday")&&!fieldInfo.getColumn().equals("gender"))
             .gt(Employee::getSalary,3500)
             .like(Employee::getName,"小");
    List<Employee> employeeList = employeeMapper.selectList(queryWrapper);
    System.out.println(employeeList);
}

SELECT departmentId,AVG(salary) AS avg_salary FROM t_employee GROUP BY department_id;

@Test
public void selectByQueryWrapper9(){
    QueryWrapper<Employee> queryWrapper=new QueryWrapper();
  
    queryWrapper.select("department_id","AVG(salary) AS avg_salary")
             .groupBy("department_id");
    List<Employee> employeeList = employeeMapper.selectList(queryWrapper);
}

//处理map中key未驼峰命名
list = list.stream().map(MapUtil::toCamelCaseMap).collect(Collectors.toList());

// 继承原来的公共mapper
// java8 interface可以写方法的实现逻辑，直接在这里写好，
// 其他地方调用时直接继承自定义的 mapper
public interface CustomBaseMapper<T> extends BaseMapper<T> {
 
    
    default int updateById(@Param("et") T entity, List<String> dirtyFields) {
        Class<?> tClass = entity.getClass();
        UpdateWrapper<T> wrapper = new UpdateWrapper<>();
        try {
            Object id = ObjectUtils.getAttrVal(entity, "id"); // 获取对象的主键值
            wrapper.eq("id", id);
        } catch (NoSuchFieldException | IllegalAccessException e) {
            throw new RuntimeException("对象主键未找到，请确认"); // 自定义异常
        }
 
        for (String dirtyField : dirtyFields) {
            try {
                Field classField = tClass.getDeclaredField(dirtyField);
                classField.setAccessible(true);
                // 对象属性，转成数据库字段
                wrapper.set(StringUtils.toColumn(dirtyField), classField.get(entity));
            } catch (Exception ignored) {
            }
        }
        return update(null, wrapper);
    } 
}