springboot+mongodb_实现按日期分组分页查询功能

下面我会详细讲解"springboot+mongodb 实现按日期分组分页查询功能"的完整攻略,并且会带上两条示例说明.

已安装Maven

已安装MongoDB并启动

在IDE中创建一个空的Springboot项目,项目依赖必须包含以下三个依赖：

    
org.springframework.boot    
spring-boot-starter-data-mongodb    
    
    
org.springframework.data    
spring-data-mongodb    
    
    
org.springframework.boot    
spring-boot-starter-web    

定义一个名为User的实体类,包含name和createTime两个属性.

public class User {    
// 省略setter和getter方法    
}

在MongoDB中创建一个名为test的数据库和名为user的集合,用于保存User实体类数据.

$ mongo
> use test
> db.createCollection("user")

在user集合中插入100条数据,时间随机生成.

$ mongo
> use test
> for(var i = 0;i<100;i++) {db.user.insert({name: "User"+i, createTime: new Date(1588608000000 + i*60*1000)})}   

定义一个名为UserRepository的接口,继承自MongoRepository,用于操作MongoDB数据库中的user集合.

@Repository
public interface UserRepository extends MongoRepository {}

定义一个名为UserService的接口,用于定义分组查询接口.

public interface UserService {
List groupByCreateTime(String collectionName, String field, int limit, int skip);
}

定义一个名为UserServiceImpl的实现类,实现UserService接口.

@Service
public class UserServiceImpl implements UserService {
public List groupByCreateTime(String collectionName, String field, int limit, int skip) {
    AggregationResults results = mongoTemplate.aggregate(aggregation, collectionName, DBObject.class);
}
}

定义一个名为UserController的控制器,用于处理前端请求.

@RestController
@RequestMapping("/user")
public class UserController {
public List groupByCreateTime(@RequestParam("field") String field,
}
}

按创建时间分组查询最新的10条记录.

$ curl 'http://localhost:8080/user/groupByCreateTime?field=createTimelimit=10skip=0'

[{"_id":{"$date":"2020-05-31T16:38:00.000Z"},"count":1},{"_id":{"$date":"2020-05-31T16:29:00.000Z"},"count":1},{"_id":{"$date":"2020-05-31T16:28:00.000Z"},"count":1},{"_id":{"$date":"2020-05-31T16:27:00.000Z"},"count":1},{"_id":{"$date":"2020-05-31T16:26:00.000Z"},"count":1},{"_id":{"$date":"2020-05-31T16:25:00.000Z"},"count":1},{"_id":{"$date":"2020-05-31T16:24:00.000Z"},"count":1},{"_id":{"$date":"2020-05-31T16:23:00.000Z"},"count":1},{"_id":{"$date":"2020-05-31T16:22:00.000Z"},"count":1},{"_id":{"$date":"2020-05-31T16:21:00.000Z"},"count":1}]

$ curl 'http://localhost:8080/user/groupByCreateTime?field=createTimelimit=10skip=10'

[{"_id":{"$date":"2020-05-31T16:20:00.000Z"},"count":1},{"_id":{"$date":"2020-05-31T16:19:00.000Z"},"count":1},{"_id":{"$date":"2020-05-31T16:18:00.000Z"},"count":1},{"_id":{"$date":"2020-05-31T16:17:00.000Z"},"count":1},{"_id":{"$date":"2020-05-31T16:16:00.000Z"},"count":1},{"_id":{"$date":"2020-05-31T16:15:00.000Z"},"count":1},{"_id":{"$date":"2020-05-31T16:14:00.000Z"},"count":1},{"_id":{"$date":"2020-05-31T16:13:00.000Z"},"count":1},{"_id":{"$date":"2020-05-31T16:12:00.000Z"},"count":1},{"_id":{"$date":"2020-05-31T16:11:00.000Z"},"count":1}]

至此,本次攻略的内容已经讲解完毕.

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