谷粒学院-4-多条件组合查询带分页

效果

流程：

再extity包下创建vo包，下面再创建TeacehrQueryWithCondition.java类

@Data
@ApiModel(value = "条件查询讲师封装对象",description = "带条件的讲师查询封装对象")
public class TeacherQueryWithCondition {
//    private static final long serialVersionUID = 1L;
    @ApiModelProperty(value = "教程查询，模糊查询",example = "张")
    private String name;
    @ApiModelProperty(value = "头衔：1、高级讲师，2、首席讲师",example = "1")
    private Integer level;
    @ApiModelProperty(value = "开始时间",example = "2019-01-01 10:10:10")
    private String begin;
    @ApiModelProperty(value = "借宿时间",example = "2019-12-01 10:10:10")
    private String end;
}

修改eduTeacehrService

//注意直接的service类是不需要@Service注解的
public interface EduTeacherService extends IService<EduTeacher> {
    public void queryTeacherWithCondition(Page<EduTeacher> ResultPage, TeacherQueryWithCondition teacherQuery);
}

修改对应service的实现类

@Service
public class EduTeacherServiceImpl extends ServiceImpl<EduTeacherMapper, EduTeacher> implements EduTeacherService {
    @Override
    public void queryTeacherWithCondition(Page<EduTeacher> ResultPage, TeacherQueryWithCondition TeacherQueryWithCondition) {
        //注意baseMapper对象，这个是内部已经封装好的注入的eduTeacherMapper对象
        QueryWrapper<EduTeacher> wrapper = new QueryWrapper<>();
        if (TeacherQueryWithCondition == null){
            //如果为空也需要做一个查询，这样之后组件中的service这个方法才能获得这个page对象
            baseMapper.selectPage(ResultPage,wrapper);
            return;
        }

        String name = TeacherQueryWithCondition.getName();
        Integer level = TeacherQueryWithCondition.getLevel();
        String begin = TeacherQueryWithCondition.getBegin();
        String end = TeacherQueryWithCondition.getEnd();

        if (!StringUtils.isEmpty(name)){
            wrapper.like("name",name);
        }
        if(!StringUtils.isEmpty(level)){
            wrapper.eq("level",level);
        }
        if (!StringUtils.isEmpty(begin)){
            wrapper.ge("gmt_create",begin);
        }
        if (!StringUtils.isEmpty(end)){
            wrapper.le("gmt_create",end);
        }
        baseMapper.selectPage(ResultPage,wrapper);
    }
}

在controller中测试使用

@ApiOperation(value = "多条件分页查询")
@PostMapping("{page}/{limit}")
public Result queryTeacherWithCondition(
        @ApiParam(name = "page",value = "页码",required = true)
        @PathVariable long page,
        @ApiParam(name = "limit",value = "每页大小",required = true)
        @PathVariable long limit,
        @ApiParam(name = "teacherQueryWithCondition",value = "带条件的讲师查询封装对象",required = false)
        @RequestBody(required = false)TeacherQueryWithCondition teacherQueryWithCondition
        ){
    Page<EduTeacher> resultPage = new Page<>(page, limit);
    eduTeacherService.queryTeacherWithCondition(resultPage,teacherQueryWithCondition);
    return Result.success()
            .data("page",resultPage)
            .data("hasNext",resultPage.hasNext()?1:0)
            .data("hasPrevious",resultPage.hasPrevious()?1:0);
}