importpymongo# 连接到MongoDB数据库client=pymongo.MongoClient("mongodb://localhost:27017/")# 选择一个数据库db=client["mydatabase"]# 选择一个集合collection=db["mycollection"]# 根据某个字段对记录进行降序排序,并选择第一条记录latest_record=collection.find().sort("_id",-1).limit(1)# 打印最新...
# 查询最新记录latest_record=collection.find().sort("timestamp",-1).limit(1)# 打印最新记录forrecordinlatest_record:print(record) 1. 2. 3. 4. 5. 6. 完整代码示例: importpymongo# 创建 MongoClient 对象并连接到 MongoDB 服务器client=pymongo.MongoClient("mongodb://localhost:27017/")# 选择或...
然后从容器中获取了MongoTemplate实例。接下来创建了Example实例,并调用findLatestRecord()方法查找最新一条记录。最后打印结果。 总结 通过本文的介绍,我们了解了如何使用MongoDBTemplate来查找最新一条记录。使用MongoDBTemplate可以简化我们在Spring项目中操作MongoDB的代码。希望本文对你有所帮助! 2022-01-012022-01-03202...
Get the latest record from mongodb collection Yet another way of getting the last item from a MongoDB Collection (don't mind about the examples): > db.collection.find().sort({'_id':-1}).limit(1) Normal Projection > db.Sports.find() { "_id" : ObjectId("5bfb5f82dea65504b456ab...
/*查找小于result.record_time的文档个数*/ db.ai_data.find({"result.record_time":{$lt:new Date(2022,10,1)}}).count(); /* 删除指定日期的文档*/ db.ai_data.remove({"result.record_time":{$lt:new Date(2022,8,1)}}); 1. 2. 3. 4. 5. pymongo模块 1.连接mongo # -*- coding:...
(query, Map.class, nodeLatestReportInfoRequest.getCollectionName()); // 填充测量时间:时间转换 if (returnMap != null) { String _id = (String) returnMap.get("_id"); returnMap.put("measureDate", getMeasureDateById(_id)); } return returnMap; } /** * 根据主键,集合名称分页获取上报...
var database = _mongoClient.GetDatabase("test"); _collection = database.GetCollection<BsonDocument>("test"); _collectionRecordStruct = database.GetCollection<RecordStructDto>("test"); _collectionRecordClass = database.GetCollection<RecordClassDto>("test"); ...
Explore the latest version of MongoDB Download Resources Documentation Atlas DocumentationGet started using AtlasServer DocumentationLearn to use MongoDBStart With GuidesGet step-by-step guidance for key tasks Tools and ConnectorsLearn how to connect to MongoDBMongoDB DriversUse drivers and libraries for...
data_record={ _id:data1, timestamp:datetime.datetime.now(), data:{sensor_id:s001,temperature:22.5,humidity: 60} } realtime_data.insert_one(data_record) #实时查询数据 frompymongoimportMongoClient frompymongoimportDESCENDING client=MongoClient(mongodb://localhost:27017/) ...
OpLog大小通过参数oplogSizeMB设置,不设置的话 WiredTiger 存储引擎默认为空闲磁盘空间5%的大小,上限50G。可以在运行时,手动执行replSetResizeOplog来改变Oplog的大小。通过rs.printReplicationInfo()和db.getReplication...