mongodb

问题 I currently have an SPA built with MERN and I want to improve it further by adding a scheduled update to a particular collection in my MongoDB database by setting a boolean field in all of the documents in a collection to false every midnight. Can someone point me to the right direction on how to accomplish this? I want to be able to scale it as well at some point - for example, have a value saved in a document in another collection to indicate the time where these boolean fields will be

问题 I've wrote a simple MongoDB Query in php That calculates total online in the past hour everything works fine But i feel this way is not good for performance Be cause query it's self return all matches data ( so there is unneeded data in that query ) What i needs is only the count of records I have a collection that has millions of documents Script: <?php // Last Online Time $Time = time() - 86400; // Connection $Manager = new MongoDB\Driver\Manager("mongodb://" . DB_USERNAME . ":" . DB

问题 Who knows a better solution to group Orders by date and sum total and count by source. Of course I can group by Source and then I get only totals for this source only, I can alter the result thereafter to get the desired result. But I would like to know if it is possible in one simple $group statement. Eg. ordersByApp = 1, ordersByWEB = 2 Orders collection { _id: 'XCUZO0', date: "2020-02-01T00:00:03.243Z" total: 9.99, source: 'APP' }, { _id: 'XCUZO1', date: "2020-01-05T00:00:03.243Z" total: 9

问题 Who knows a better solution to group Orders by date and sum total and count by source. Of course I can group by Source and then I get only totals for this source only, I can alter the result thereafter to get the desired result. But I would like to know if it is possible in one simple $group statement. Eg. ordersByApp = 1, ordersByWEB = 2 Orders collection { _id: 'XCUZO0', date: "2020-02-01T00:00:03.243Z" total: 9.99, source: 'APP' }, { _id: 'XCUZO1', date: "2020-01-05T00:00:03.243Z" total: 9

问题 like: {id:4563214321,updateTime:long("124354354")} there are always new collections enter the db, so I would like to always get latest updated documents aka the largest update time. how to design the shell script? thanks in advance. 回答1: You can use a combination of limit and sort to achieve this goal. db.collectionName.find({}).sort({"updateTime" : -1}).limit(1) This will sort all of your fields based on update time and then only return the one largest value. I would recommend adding an

问题 like: {id:4563214321,updateTime:long("124354354")} there are always new collections enter the db, so I would like to always get latest updated documents aka the largest update time. how to design the shell script? thanks in advance. 回答1: You can use a combination of limit and sort to achieve this goal. db.collectionName.find({}).sort({"updateTime" : -1}).limit(1) This will sort all of your fields based on update time and then only return the one largest value. I would recommend adding an

问题 I have a query like this: galleryModel.find({_id: galleryId}) .populate({ model: 'User', path: 'objectId', select: 'firstName lastName' }) End response for objectId will be like this: objectId: { ... } How can I change it to user in response without changing real path? 回答1: You can do this by virtual populate, introduced in mongoose version 4.5 . For that you need to define a virtual field in mongoose schema. var GallerySchema = new mongoose.Schema({ name: String, objectId: { type: mongoose

问题 i am confuse. here is the example: MongoDB Enterprise > db.employee.find() result: {"_id":1002,"name":"Jack","address":{"previous":"Cresent Street","current":"234,Bald Hill Street","unit":"MongoDB" } } I try this: db.employee.find({address:{previous: "Cresent Street"}}) result: nothing returns Next a try this: db.employee.find({"address.previous": "Cresent Street"}) result: {"_id":1002,"name":"Jack","address":{"previous":"Cresent Street","current":"234,Bald Hill Street","unit":"MongoDB"}} The

问题 I have a problem in my JSR 223 Groovy script when it tries to access MonDB 3.0.3 with authentication enabled from JMeter 2.3 : import com.mongodb.DB; import org.apache.jmeter.protocol.mongodb.config.MongoDBHolder; DB db = MongoDBHolder.getDBFromSource("mongoDS", "${mongodb_database}", "${mongodb_user}", "${mongodb_password}"); DBCollection coll = db.getCollection("users"); BasicDBObject query = new BasicDBObject("userId",vars.get("userId")); DBCollection coll = db.getCollection("users"); This

问题 i can connect locally to my mongodb server with the address 0.0.0.0/0. However, when I deploy my code to the cloud I get the error deploy to google cloud function. google cloud function with python 3.7 (beta) atlas mongo db python lib: -pymongo -dnspython Error: function crashed. Details: All nameservers failed to answer the query _mongodb._tcp.**-***.gcp.mongodb.net. IN SRV: Server ***.***.***.*** UDP port 53 answered SERVFAIL Traceback (most recent call last): File "/env/local/lib/python3.7