Spring Data MongoRepository 获取最新一条记录

女爷i 2022-10-09 00:32 185阅读 0赞

Mongodb 某张表结构示例如下：

{
        
    	"instanceSpec": "ecs.c6e.xlarge", 
    	"productName": "云服务器 ECS", 
    	"instanceID": "i-j6cioly7ub9e0hqh0od5", 
    	"deductedByCashCoupons": 0, 
    	"listPriceUnit": "", 
    	"billingDate": "2021-06-08", 
    	"listPrice": "", 
    	"paymentAmount": 16.18, 
    	"deductedByPrepaidCard": 0, 
    	"invoiceDiscount": 0, 
    	"subscriptionType": "PayAsYouGo", 
    	"item": "PayAsYouGoBill", 
    	"pretaxGrossAmount": 16.202998, 
    	"instanceConfig": "iz:香港可用区 D;实例规格名称:ecs.c6e.xlarge;CPU:4;内存:8192;磁盘:4;外网出方向带宽:0.0Mbps;OS:UBUNTU;是否io优化:io_optimized_only", 
    	"currency": "CNY", 
    	"commodityCode": "ecs", 
    	"costUnit": "未分配", 
    	"resourceGroup": "默认资源组", 
    	"billingType": "其它", 
    	"usage": "", 
    	"deductedByCoupons": 0, 
    	"productDetail": "云服务器ECS-按量付费", 
    	"productCode": "ecs", 
    	"zone": "cn-hongkong-d", 
    	"productType": "", 
    	"outstandingAmount": 0, 
    	"billingItem": "", 
    	"nickName": "prod-Online-Mongo3-new3", 
    	"intranetIP": "18.31.25.14", 
    	"pipCode": "ecs", 
    	"servicePeriodUnit": "秒", 
    	"servicePeriod": "39600", 
    	"deductedByResourcePackage": "", 
    	"usageUnit": "", 
    	"ownerID": "1644990457084567", 
    	"pretaxAmount": 16.18, 
    	"internetIP": "47.43.38.27", 
    	"region": "中国（香港）", 
    	"tag": "key:国际部 value:香港"
    }

现在需要根据 instanceID 查出其 billingDate 最新的一条记录，Spring Data MongoRepository 可以使用如下写法：

// 找到给定实例最新的一条账单数据
        @Query(value="{'instanceID':?0}")
        AliyunInstanceEcsBill findTop1ByBillingDateDesc(String instanceId);

参考自《[Get last created document in Mongodb using Spring Data repository][]》。  
提问者的示例代码：

@Data
    @Document
    public class Batch
    {
        
        @Id
        String id;
        LocalDateTime created;
        //other stuff
    }
    
    public interface BatchRepository extends MongoRepository<Batch,String>
    {
        
        //this does not work
        //Batch findOneOrderByCreatedDesc();
    }

[Andriy Simonov][]：

> Notice that the method name slightly differs from your variant, this difference is important as spring parses the method name and builds a query based on the result of parsing.

[Zon][]：

> findTopByOrderByCreatedDesc(); -> findTop1ByCreatedDesc();

[Get last created document in Mongodb using Spring Data repository]: https://stackoverflow.com/questions/38716936/get-last-created-document-in-mongodb-using-spring-data-repository
[Andriy Simonov]: https://stackoverflow.com/users/6376725/andriy-simonov
[Zon]: https://stackoverflow.com/users/1112963/zon