MongoDB

1. Start MongoDB in master mode first2. Import the data files of the main library:/data/mongodb-3.0.12/bin/mongorestore/data/tmp/mongodbbak/3. Close the Mongdb:Kill-2 PID4. Modify the configuration file, set the boot from the mode, and set the main

Increase:Db:Use db_name//If there is a switchTabale:There is no direct command to automatically generate when inserting a documentFileDb.table_name.insert ({' Test ': ' OK '})Field:Db.table_name.update ({' Test ': {$exists: true}},{$set: {' test2 ':

Modify the field name to change the name_status of the Synonymslist table to statusDb.getcollection (' Synonymslist '). Update ({}, {$rename: {"Name_status": "Status"}}, False, True)The from this array has Hengduan this value, and Zhlatin is empty

An import PymongoFrom Pymongo import mongoclientTwo connection server port number 27017Connect to MongoDBConnect MongoDB We need to use the Pymongo library inside the mongoclient, generally incoming MongoDB IP and port, the first parameter is the

First, $group to group1. Number of employees in each position:Db.getcollection (' emp '). Aggregate ([{' $group ': {' _id ': ' $job ',job_count:{' $sum ': 1}}}])2. Total salary for each positionDb.getcollection (' emp '). Aggregate ([{' $group ': {'

Enter Mongodb:mongoExit Mongodb:exitShow All libraries: Show DBSSwitch database: Use database nameView your library: DBDelete Library: Db.dropdatabase ()View a collection of current databases: Show collectionsCollection creation: db.createcollection

First, resourcesMongoHttps://www.mongodb.com/download-center#communityRomongo Download:https://robomongo.org/The following three files, (Mongodb-compass can not be under, this is the management of MONGO with the graphical interface, accustomed to

Pre-Installation Note: This tutorial is installed with Yum. 64-bit CentOS system onlyInstallation steps:1. Create a warehouse file:Vi/etc/yum.repos.d/mongodb-org-3.4.repoThen copy the following configuration, save exit[mongodb-org-3.4]name=MongoDB

1: InstallationMkdir-p/app/mongodbTar zxvf mongodb-linux-x86_64-rhel62-3.4.6.tgzVI. bash_profilePath= $PATH: $HOME/binPath= $PATH:/app/mongodb/mongodb-linux-x86_64-rhel62-3.4.5/binExport PATH--Let the configuration file take effectsource.

1. Download MongoDBMongoDB provides precompiled binary packages for 32-bit and 64-bit systems that you can download from the MongoDB official website, MongoDB precompiled binary Package: Https://www.mongodb.com/download-center#community. Note:

If the installation path does not exist, the EXE software will not be unpacked!After installing MONOGODB, it does not automatically add the execution path!This means that the installation path is the MongoDB folder under the D drive, and if this

1. Download Mongodb-win32-x86_64-2008plus-ssl-v3.6-latest extract toD:\mongodb2.cmd = Does the path have an environment variable if not configured3. Create D:\mongodb\data\db and D:\mongodb\logs\mongodb.log, D:\mongodb\ config\ mongod.cfgMongod.cfg

1. Preparatory workInstalling the Pymongo modulePIP3 Install Pymongo2. Connect MongoDBImport PymongoNo authentication connection: client = Pymongo. Mongoclient ("Mongodb://host:port/dbname")There is an authentication connection: client = Pymongo.

Build a clusterCluster construction on-line search has 3 programs: Replica Set/sharding/master-slaverThe third type is basically not used by very few people at this time. Main introduction Replica Set and shardingReplica Set　　The deployment Chinese

MongoDB Shell IntroductionMongoDB comes with a JavaScript shell that can interact with the MongoDB real column in the shell using the command line. The shell can perform administrative operations, check for operations such as running a real column,

Inserting data into the MongoDB databaseOne: Connection access collection;In a MongoDB database, data is stored in many data collections, and a collection can be accessed using the collection method of the Database object. The method is used as

#!/usr/bin/env python#coding:utf-8import osimport sysdef start(): os.system(‘/usr/local/mongodb/bin/mongod -f /usr/local/mongodb/conf/mongodb.conf‘)def stop(): os.system(‘/usr/local/mongodb/bin/mongod --shutdown --dbpath /data/mongodb/db‘)def status(

1. Connect your MongoDB FirstSee if there is a problem with the connection, codepublic class MongoDB2 {private static mongodatabase mongodatabase = null;private static int port = 27017;private static St Ring UserName = "XX";p rivate static string

MongoDB BasicsStage One, understanding MongoDB1, the basic form of data of MongoDB organizationMongoDB ———— Database ———— "collection ————" documentationMySQL: Table: Rows and Columns: FieldsApplication scenarios: such as real-time information about

DownloadMongoDB's official website is: http://www.mongodb.org/Can be downloaded on the official website, but I tried a special trouble, all found a simple way, you can download directly at this address