使用LambdaQueryWrapper动态加过滤条件 动态Lambda

  
    private static final int FLAG_SERIALIZABLE = 1;  
//获取当前登录人权限
 Integer secretLevel = getUserSecretLevel();
        if(secretLevel!=null){
            SFunction func = null;
            final MethodHandles.Lookup lookup = MethodHandles.lookup();
            //po的返回Integer的一个方法
            MethodType methodType = MethodType.methodType(Integer.class, entityClass);
            final CallSite site;
            try {
                //方法名叫做:getSecretLevel  转换为 SFunction function interface对象
                site = LambdaMetafactory.altMetafactory(lookup,
                        "invoke",
                        MethodType.methodType(SFunction.class),
                        methodType,
                        lookup.findVirtual(entityClass, "getSecretLevel", MethodType.methodType(Integer.class)),
                        methodType,FLAG_SERIALIZABLE);
                func = (SFunction) site.getTarget().invokeExact();
                //数据小于这个级别的都查出来
                queryWrapper.le(func,secretLevel);
            } catch (Throwable e) {
                log.error("获取getSecretLevel方法错误",e);
            }
        }

LambdaQueryWrapper<SomeClass> objectLambdaQueryWrapper = Wrappers.lambdaQuery();
        objectLambdaQueryWrapper.eq(searchDto.getTemplateCode() != null, ContractTemplate::getTemplateCode, searchDto.getTemplateCode());

        IPage<SomeClass> page = page(MybatisPlusUtil.setPageParams(pageNo, pageSize), objectLambdaQueryWrapper);
      return page

QueryWrapper<SomeClass> queryWrapper = Wrappers.query();
        queryWrapper.eq(searchDto.getTemplateCode() != null, TemplateConst.COL_TEMPLATE_CODE, searchDto.getTemplateCode())
                .ge(searchDto.getStartDate() != null, TemplateConst.COL_CREATE_TIME, searchDto.getStartDate())
                .lt(searchDto.getEndDate() != null, TemplateConst.COL_CREATE_TIME, DateUtils.aDDDays(searchDto.getEndDate(), 1))
                .eq(searchDto.getContractCateGoryId() != null, TemplateConst.COL_CATEGORY_ID, searchDto.getContractCategoryId())
                .and(i -> i.like(TemplateConst.COL_TEMPLATE_NAME, searchDto.geTKEyword()).or().like(TemplateConst.COL_DESCRIPTION, searchDto.getKeyword()))
                .eq(searchDto.getIs_enabled() != null, TemplateConst.COL_IS_ENABLED, searchDto.getIs_enabled())
                // 未标志删除的数据
                .eq(CommonConst.DBColName.DEL_FLAG, CommonConst.IsEnabled.ENABLED.getCode())
                .orderByDesc(TemplateConst.COL_CREATE_TIME)
                ;
        IPage<ContractTemplate> page = page(MybatisPlusUtil.setPageParams(pageNo, pageSize), queryWrapper);
        return MybatisPlusUtil.parsePageDTO(page);