mongodb

Exception while connecting through Spring Data to MongoDB

时光总嘲笑我的痴心妄想 提交于 2021-02-11 08:10:09
问题 I am working on some test program for SpringData MongoDB , I have done it same as it's mentioned on http://static.springsource.org/spring-data/data-document/docs/1.0.0.M2/reference/html/#mongo.core. But it's showing exceptions: package com.springMongo.core; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.springframework.context.ApplicationContext; import org.springframework.context.annotation.AnnotationConfigApplicationContext; import org

mongoose model, array of strings, array of objects structure

[亡魂溺海] 提交于 2021-02-11 07:24:43
问题 I am trying to design my database model and i dont have clue how to fit array of strings and array of objects into it. My current model is: const mongoose = require("mongoose"); const Schema = mongoose.Schema; const schema = new Schema({ email: { type: String, unique: true, required: true }, hash: { type: String, required: true }, createdDate: { type: Date, default: Date.now }, settings: { favorites: { /* ??? */ }, cart: { /* ??? */ }, states: { favorites: { type: Boolean, default: true },

How to control size of journals in mongodb?

百般思念 提交于 2021-02-11 07:12:38
问题 How to control the size of large journals files as journal file take large amount of space. How can the space can be saved using small files. 回答1: After doing some research: Setting smallfiles option for controlling journaling doesn't control the size However the command is --smallfiles 回答2: Here are some ways to control journal file size, Use --smallfiles option in mongod which will use 128MB as max size of journal file instead of 1GB ulimit is way in unix to control system settings. It will

find({}) returns an empty array mongoose

依然范特西╮ 提交于 2021-02-11 06:56:10
问题 Here is my code in model.js file: const mongoose = require("mongoose"); const con = require("./connection"); con(); const schoolNotices = mongoose.model("schoolNotices", { title:{ type: String }, date:{ type:String }, details:{ type:String } }); module.exports = schoolNotices; And I have imported this code into students.js file router.route("/notices") .get((req,res)=>{ schoolNotices.find({},(err,docs)=>{ if(err){ return console.log(err) } res.render("studentNotices",{title:"Notices",data

MongoDB concurrent update to same document is not behaving atomic

无人久伴 提交于 2021-02-11 06:55:31
问题 Currently, we have an orderId for which we give the benefit(posting) to the user. There are multiple events that can trigger benefit/posting. But the condition is that only 1 event should be triggered. Hence for handling current requests, we created a boolean field POSTING_EVENT_SENT , initially set to false, and later whoever was able to mark it as true can proceed further. public boolean isOrderLockedAndUpdatedToTriggerPosting(String orderId, OrderStatus orderStatus) { Query query = new

Mongoose join two collections and get only specific fields from the joined collection

人盡茶涼 提交于 2021-02-11 06:55:00
问题 I have a problem joining two collections in mongoose. I have two collections namely: student and exams. Student model: { fullname: { type: String, required: true }, email: { type: String, required: true }, } Exams model: { test: { type: String, required: false }, top10: [ type: { studentId: { type: String, required: true }, score: { type: Number, required: false }, } ] } Now, I want to join them two by studentId . The result should be: { "test": "Sample Test #1", "students": [ { "studentId":

MongoDB concurrent update to same document is not behaving atomic

筅森魡賤 提交于 2021-02-11 06:54:09
问题 Currently, we have an orderId for which we give the benefit(posting) to the user. There are multiple events that can trigger benefit/posting. But the condition is that only 1 event should be triggered. Hence for handling current requests, we created a boolean field POSTING_EVENT_SENT , initially set to false, and later whoever was able to mark it as true can proceed further. public boolean isOrderLockedAndUpdatedToTriggerPosting(String orderId, OrderStatus orderStatus) { Query query = new

Mongoose join two collections and get only specific fields from the joined collection

人盡茶涼 提交于 2021-02-11 06:54:05
问题 I have a problem joining two collections in mongoose. I have two collections namely: student and exams. Student model: { fullname: { type: String, required: true }, email: { type: String, required: true }, } Exams model: { test: { type: String, required: false }, top10: [ type: { studentId: { type: String, required: true }, score: { type: Number, required: false }, } ] } Now, I want to join them two by studentId . The result should be: { "test": "Sample Test #1", "students": [ { "studentId":

PostgreSQL and MongoDB WHERE IN condtions

夙愿已清 提交于 2021-02-11 06:52:32
问题 Sorry for my bad English. I have a table in postgres like: CREATE TABLE report ( id serial primary key, sensor_id integer, datetime timestamp, ...(many other fields) ); Collection in mongo stores the same data. Index in Postgres (I created all of them and separatly, but result is the same) : create index report_datetime on report (datetime desc); create index report_sensor_datetime on report (datetime desc, sensor_id); create index report_sensor_datetime_1 on report (sensor_id, datetime desc)

PostgreSQL and MongoDB WHERE IN condtions

放肆的年华 提交于 2021-02-11 06:52:15
问题 Sorry for my bad English. I have a table in postgres like: CREATE TABLE report ( id serial primary key, sensor_id integer, datetime timestamp, ...(many other fields) ); Collection in mongo stores the same data. Index in Postgres (I created all of them and separatly, but result is the same) : create index report_datetime on report (datetime desc); create index report_sensor_datetime on report (datetime desc, sensor_id); create index report_sensor_datetime_1 on report (sensor_id, datetime desc)