mongodb

问题 I am trying to reuse my existing EmployeeRepository code (see below) in two different microservices to store data in two different collections (in the same database). @Document(collection = "employee") public interface EmployeeRepository extends MongoRepository<Employee, String> Is it possible to modify @Document(collection = "employee") to accept runtime parameters? For e.g. something like @Document(collection = ${COLLECTION_NAME}) . Would you recommend this approach or should I create a new

问题 At first everything works, and I can successfully store data by posting to the /upload route. But after 120 seconds of inactivity, the timeout event fires, and future attempts to store data fail. However the callback isn't called, so there is no "Unable to insert..." message at the log. var express = require('express'); var bodyParser = require('body-parser'); var winston = require('winston'); var config = require('./config'); var MongoClient = require('mongodb').MongoClient; var app =

问题 At first everything works, and I can successfully store data by posting to the /upload route. But after 120 seconds of inactivity, the timeout event fires, and future attempts to store data fail. However the callback isn't called, so there is no "Unable to insert..." message at the log. var express = require('express'); var bodyParser = require('body-parser'); var winston = require('winston'); var config = require('./config'); var MongoClient = require('mongodb').MongoClient; var app =

问题 I'm currently creating a new API with MongoDB and Express, and I'm currently having this issue "Operation disneys.insertOne() buffering timed out after 10000ms." I'm currently using route.rest to test my API. However, I don't know what I'm currently doing wrong, could someone take a look at my Github Repository ? This is the way that I setup my API calls: const express = require("express"); const router = express.Router(); const Disney = require("../models/disneyCharacter"); // Getting all

问题 I'm currently creating a new API with MongoDB and Express, and I'm currently having this issue "Operation disneys.insertOne() buffering timed out after 10000ms." I'm currently using route.rest to test my API. However, I don't know what I'm currently doing wrong, could someone take a look at my Github Repository ? This is the way that I setup my API calls: const express = require("express"); const router = express.Router(); const Disney = require("../models/disneyCharacter"); // Getting all

问题 How to remove the last two characters of String in MongoDB? I have tried below solution but it did not work. $substr: [ "$document.field", 0, { $strLenCP: "$document.field" } - 2 ] 回答1: You have to use $add or $subrtract to evaluate the length of a new string: db.collection.aggregate([ { $project: { newStr: { $substr: [ "$document.field", 0, { $add: [ { $strLenCP: "$document.field" }, -2 ] } ] } } } ]) MongoDB Playground 来源： https://stackoverflow.com/questions/56537076/mongodb-remove-last-two

问题 This is my environments. Java - 1.7 by Oracle mongod v2.4.5 (in Mongolab) I found difference in performance of the two MongoDB driver(2.9.3 vs 2.11.2) When I run same code using each driver, 2.11.2 slower than 2.9.3. for(int i=0; i<1000; i++){ BasicDBObject doc = new BasicDBObject( "currentTime", new SimpleDateFormat("HH:mm:ss:SSS").format(Calendar.getInstance().getTime()) ); coll.insert(doc); } DBCursor cursor = coll.find(); try{ while(cursor.hasNext()){ System.out.println(cursor.next()); }

问题 Anyone have idea how to export distinct column value on mongodb using mongoexport command. Command: db.coll.distinct("uid"); The solution i have tried is : mongoexport --csv -d db -c collection -q '{distinct: "collection", "key": "uid"}' -f "uid" -o distinctUid.csv 回答1: It's not possible to do it this way. distinct is a database command, and --query option allows to use only a query to filter documents. If you are using mongodb v3.4 or later, you can use views to aggregate your collection and

问题 Anyone have idea how to export distinct column value on mongodb using mongoexport command. Command: db.coll.distinct("uid"); The solution i have tried is : mongoexport --csv -d db -c collection -q '{distinct: "collection", "key": "uid"}' -f "uid" -o distinctUid.csv 回答1: It's not possible to do it this way. distinct is a database command, and --query option allows to use only a query to filter documents. If you are using mongodb v3.4 or later, you can use views to aggregate your collection and

问题 Anyone have idea how to export distinct column value on mongodb using mongoexport command. Command: db.coll.distinct("uid"); The solution i have tried is : mongoexport --csv -d db -c collection -q '{distinct: "collection", "key": "uid"}' -f "uid" -o distinctUid.csv 回答1: It's not possible to do it this way. distinct is a database command, and --query option allows to use only a query to filter documents. If you are using mongodb v3.4 or later, you can use views to aggregate your collection and