mybatis ---- 分页查询，，源码

 PageHelper 有封装的分页插件---直接用即可

@GetMapping("/toDeptList")
public BaseResponse toDeptList(Model model,@RequestParam(required = false,defaultValue = "1",value = "pn")Integer pn ) {
    BaseResponse response = new BaseResponse();
    try{
        PageHelper.startPage(pn, 15);  //pn--页数，定值---每页的数量
        List<ReleaseBase> rbList = rbService.searchData();      //查询表里所有的数据
        PageInfo<ReleaseBase>  p = new PageInfo<>(rbList);
        model.addAttribute("deptList", rbList);
        model.addAttribute("page", p);
        response.setData(rbList);
        response.setSuccess(true);
        return response;
    }catch (Exception e){
        response.setErrorMsg(ErrorCode.SYSTEM_ERROR.getDesc());
    }
    return response;
}

sql ：//根据需求要求条件查询

@Select(" SELECT  rb.*,cp.scale  FROM release_base rb,company cp WHERE  rb.is_bid LIKE '%${is_bid}%' AND rb.live LIKE '%${live}%' AND rb.education LIKE '%${education}%' AND rb.bounty LIKE '%${bounty}%' AND rb.num LIKE '%${num}%' AND rb.type like '%${type}%' AND rb.creat_time LIKE '%${creat_time}%' AND cp.scale LIKE '%${scale}%' and rb.category_name LIKE '%${category_name}%' group  by  creat_time  ")
List<ReleaseBase> searchData();