mongodb

问题 Is it possible to use a variables in MongoDB's query like this? var FOO="123"; var BOO="323"; user.findOneAndUpdate({_id: userID},{$set:{FOO:BOO}} BOO - the value, is working fine and it's being assign, while FOO - the key is not. 回答1: In MongoDB as such no functionality but you can do this in javascript like this var FOO="123"; var BOO="323"; user.findOneAndUpdate({_id: userID},{$set:{[FOO]:BOO}} 来源： https://stackoverflow.com/questions/48136206/how-to-use-variables-in-mongodb-query

问题 I have a document like this: { "id": "xxxxxxxxxxxx", "groupsAuthorized": [ "USA/California/SF", "France/IDF/Paris" ] } And I have an user that has a list of authorized groups, like for example the following: "groups": [ "France/IDF", "USA/NY/NYC" ] What I'm trying to achieve is to retrieve all documents in the database that the user is authorized to retrieve, essentially I want to be able to check in the list "groupsAuthorized" if one of the group contains a subset of an element of the other

问题 I am attempting to do a mongodb regex query on a field. I'd like the query to prioritize a full match if it finds one and then partials afterwards. For instance if I have a database full of the following entries. { "username": "patrick" }, { "username": "robert" }, { "username": "patrice" }, { "username": "pat" }, { "username": "patter" }, { "username": "john_patrick" } And I query for the username 'pat' I'd like to get back the results with the direct match first, followed by the partials.

问题 I am coding an app in which there are some weather sensors that send air's temperature and humidity to the server every 5 minutes. I would like to draw a chart of how the temperature and humidity change i.e overnight. My idea is to draw the chart basing on data from last 24 hours. I cannot figure it out by myself, so I thought maybe I could seek help here. Of course, each measurement document has a field called createdAt which has the timestamp of the moment it has been created. I need to

问题 I'm linking two objects in one query and use aggregate function for it. Some data is localized and I'm using a solution from here to get data for specified locale. I am struggling to do the same with data from the linked object (rooms). Specifically, list data for given locale from the roomDetails. Please take a look at the Mongo playground 回答1: You just need to add filter in your second $addFields stage that you are filtering roomTypes and rest of the stages would be same, just highlighted

问题 I'm linking two objects in one query and use aggregate function for it. Some data is localized and I'm using a solution from here to get data for specified locale. I am struggling to do the same with data from the linked object (rooms). Specifically, list data for given locale from the roomDetails. Please take a look at the Mongo playground 回答1: You just need to add filter in your second $addFields stage that you are filtering roomTypes and rest of the stages would be same, just highlighted

问题 I'm linking two objects in one query and use aggregate function for it. Some data is localized and I'm using a solution from here to get data for specified locale. I am struggling to do the same with data from the linked object (rooms). Specifically, list data for given locale from the roomDetails. Please take a look at the Mongo playground 回答1: You just need to add filter in your second $addFields stage that you are filtering roomTypes and rest of the stages would be same, just highlighted

问题 How do I change a PostgreSQL query into a mongodb bson call? I have the same use case listed at http://archives.postgresql.org/pgsql-general/2011-10/msg00157.php I would like to calculate the delta time between two log entries by using something like lag or lead. Is there anything similar in mongodb to Postgres' lag / lead syntax? select index, starttime, endtime, starttime - lag(endtime) over(order by starttime asc) as delta from test http://www.postgresql.org/docs/8.4/static/functions

问题 How do I change a PostgreSQL query into a mongodb bson call? I have the same use case listed at http://archives.postgresql.org/pgsql-general/2011-10/msg00157.php I would like to calculate the delta time between two log entries by using something like lag or lead. Is there anything similar in mongodb to Postgres' lag / lead syntax? select index, starttime, endtime, starttime - lag(endtime) over(order by starttime asc) as delta from test http://www.postgresql.org/docs/8.4/static/functions

问题 I am looking for a way to search for a keyword (ex. "Henrik") in the "answers" array of documents with the following structure Array ( [_id] => MongoId Object ( [$id] => 4eeedd9545c717620a000007 ) [formId] => 6 [respId] => 4eeedd95c93228 [dateCreated] => 2011-10-14 07:45 [answers] => Array ( [field1] => Henrik [field6] => myemail@domain.com [field7] => my city address ) ) I am working in PHP on this project, and quering like this works of course: $answers = $collection->find( array('formId' =