problem description mongoose populate doesn t seem to work. Confusingly, I use it in another part of the project, and it s normal . the environmental background of the problems and what methods you have tried mongodb: 4.0.1 mongoose: 5.2.9 rel...
-sharp ! usr bin python3 -sharp encoding=utf-8 import db from pymongo import MongoClient user = db.get_db_user() recharge = db.get_db_recharge() consume = db.get_db_consume() client = MongoClient( localhost , 27017) db = client.test col_new = db.new ...
found mergeObjects and replaceRoot aggregation methods in order to merge collections. examples of official documents are copied down and modified and found that there are no errors available, but there are a few areas that I do not understand. Ple...
problem description recently, we need to build a high-speed coupon distribution system. Now the mysql, used in the database has a sub-database and sub-table, but it has a bottleneck on the sending rate, and it is more complex for batch operations (the...
follow the example on the Internet to write that you can t roll back? db.col.find () { "_ id ": ObjectId ( "5b845237d63ff6fb1220861c "), "name ": "ccy "} { "_ id ": ObjectId ( "5b8453f5cf6edbf8ffc60a95 "), "name ": "ssy "} { "_ id ": ObjectId ...
there are currently three collections user consume recharge just want to completely modify the User collection instead of creating a temporary collection like lookup, is there any efficient way, after all, there is a lot of data. currently used $repl...
the GUI used by mongodb, recently is Robo 3T. After switching from mongohub, to Robo 3T, I haven t found the import import function since I used import ....
there is no new data in the database after executing save (). Is it because the new version of MongoDB needs to create users and log in securely by authentication? the complete code is as follows: movie.js file const mongoose = require( mongoose );...
user table associated with consumption table want to query the conditions of users who have not consumed for 3 months match2 by the way, how to optimize the following conditions? match0 = { $match : { regDate : { $gte : day_30, $lt : today}...
I know that mongodb 4.0 + has begun to support transactions. But now the company requires meteor for development, while meteor uses version 3.6.x of mongodb. Transactions cannot be natively supported. I have also looked up a lot of practices for impleme...
for example, the script is constantly writing data (the data level is very deep. The), tail-f log can see that it has been written to 10000 items, and it is also possible to find this piece of data in mongodb, but the direct count has only 9800 items of ...
Environment: Mongodb 3.6.3 mongoose: 5.2.5 nodeJS: 8.x description: simulate the blog system. There are two collection (articles comments), schema as follows Query for comment Params: { offset limit sortBy } exports.getComment...
mongoose multi-table query, no data found schema var productSchema = new Schema({ id: Number, specval:{type: Schema.Types.ObjectId,ref: product_specval } },{collection: product }) var productSpecValSchema = new Schema({ _id: Schema...
problem description if you want to get a piece of data required by composition in the course field, the data returned after using find contains excess data, and the result is not ideal. In order to achieve this goal, how to write code, it seems that...
problem description create a student Schame, with mongoose but report an error at run time, the error is in the Schema; of the third line TypeError: schema is not a constructor looked at the code did not find a mistake, please help to have a look, t...
connecting to the database ok, is sure to be connected, but when manipulating a collection, the collection is not automatically created in the database when the collection does not exist. I remember that the document said that it would be automatically c...
the blog deployed on Tencent Cloud found that there was no content after opening it. Then I checked for a long time and found that the database had been deleted. it should be this ip 51.38.110.16032854 that deletes my database (I don t know who is...
[ { _id : ObjectId( 5abb4f9ca7e2c54c757b3e48 ), amount : 8400, buyerEmail : otzYzwMh24edWk8NxSJOqCSZREe0 , from : weixin , orderDate : datetime.datetime(2018, 3, 28, 8, 17, 28, 940000), orderid ...
mongod-- config mongod.conf reported an error unrecognised option th mongod --config usr local etc mongod.conf I don t know what s wrong. I can t start . ...
mangodb is configured on the server and mongo.conf, is ready to start in the bin directory . mongod-f mongodb etc mongo.conf but error I CONTROL [main] Automatically disabling TLS 1.0, to force-enable TLS 1.0 specify-- sslDisabledProtocols none...
I built a WEB Server, on the embedded device to access through HTTPS, but I found that if the page is not refreshed every few seconds, and then click on the page, the lower left corner of the browser will prompt "secure connection is being established "...
this is the link I posted on the bar Xcode console cin input Chinese does anyone know how to solve this problem? ...
Code: $(function(){ window.a=function(){} window.a Function }) window.a undefined Why can t properties be added internally to the window object? What should I do if I want to expose some methods to external calls? ...
renderindex ...
the project I wrote in koa2 is ready to be deployed on the test server. The server has pm2, installed and started. Do you need nginx configuration? and after I started, I seemed to prompt that the mongodb service did not start, how should I start it? ...