MongoDB

MongoDB installation startsThe download and installation of MongoDB is the same as the usual app.MongoDB Preparation work:1. Create two folders in the directory where Mongodb is installed: for example: mongodb\data\dbMongodb\data\log\mongod.logHere

MongoDB's website: https://www.mongodb.com/download-centerClick Community Server to enter the Community Edition download pageThe current stable version is (Stable release) is 3.6.2Version of the selection:MongoDB version naming rules: x.y.z Y

Additional OverheadEach index occupies a certain amount of storage space, and the indexes need to be manipulated when inserting, updating, and deleting operations. Therefore, if you seldom read the collection, we recommend that you do not use the

mongoexport-d test-c Item--type=csv-f salary,city,workyear,companyshortname-o user.csvmongoexport-d test-c user--type=csv-f Tel,type,username-o user.csv-D represents the database-C Representative Table--type represents the exported format-F

Before the start of MongoDB is normal, do not know the start error later, the paste out query. Finally know is due to their abnormal shutdown caused by this situation.--Excerpt: MongoDB abnormal shutdown after repair recordMongod no background

MongoDB Limit () methodIf you need to read a specified number of data records in MongoDB, you can use the MongoDB limit method, and the limit () method accepts a numeric parameter that specifies the number of record bars read from MongoDB.GrammarThe

http://blog.itpub.net/26812308/viewspace-2124660/The secondary node in replica sets is not readable by default.Use replica sets for read-write separation. By specifying Slaveok at the time of connection, or by specifying the secondary in the main

1.       Configure a three-node configuration file (/etc/28001.conf)28002.conf#bind_ip

Create userGrammar:Db.createuser ({User:, #字符串Pwd:, #字符串Roles:[{role:,db:}] #数组})To create a user:> db.createUser(... {... user:"root",... pwd:"admin",... roles:[{role:"root",db:"admin"}]... }... )User authentication:>

Authorized users ReadWrite have read and write access to the Test1 library:> use test1switched to db test1> db.createUser({user: "readwrite",pwd: "readwrite",customData: {description: "测试用户readwrite"},roles: [{role: "readWrite",db: "test1"}]})Verify

1PHP2 functionGetmongoclient ($seeds= "",$options=Array(),$retry= 3) {3 Try {4 return NewMongoclient ($seeds,$options);5}Catch(Exception $e) {6 /*Log The exception so we can look into why Mongod failed later*/7Logexception ($e);8

Establish a connection to MongoDB: official documentation#coding: Utf-8import pymongoclient = Pymongo. Mongoclient (' 127.0.0.1 ', 27017) # establishes a connection with MongoDB # when there is a user name and password: Pymongo. Mongoclient ('

After installation, statements such as/usr/local/php/lib/php/extensions/no-debug-zts-20060613/are outputIn the PHP configuration fileVi/usr/local/php/etc/php.iniDownload Mongo-php-driver-master.zip：1. unzip mongo-php-driver-master.zip2. cd mongo-php-

1. Installing MongoDB and Mongoose under the projectNPM Install MongoDB--save---save-devIn 2.routervarRouter = require (' Koa-router '))();varMongoose = require (' Mongoose ')); Mongoose. Promise= Global. Promise;//Initialize//Mongoose. Promise =

1. MongoDB Installation: The steps for installing MongoDB under the Ubuntui system can be found in the website manual:https://docs.mongodb.com/manual/tutorial/install-mongodb-on-ubuntu/Also or

Some friends say you can close mongodb with the following command:Killall MongoDB#or-9 MONGO-pid The above method does turn MongoDB off, but it's not the right thing to do, and MongoDB provides a command to shut down the database:First you need

Query data using DB. Table name. Find () query data   If you do not specify a condition, the default query is all for example > Db.noPK.find () {"_id": ObjectId ("5a50642b908e6b07a84472a2"), " Name ":" JavaScript "," Value ":" Vue.js "} {" _id ":

Reference post: https://www.jianshu.com/p/ccdd3e884b86First, installation Preparation1. Modify the System configuration#关闭selinux, Firewall#修改/etc/security/limits.conf Add the following: Soft Nofile 65536 Hard Nofile 65536 Soft

Use the DB. Table name. Update mates $unset use for example our table NOPK has two columns with field names that are Script_type we want to delete Script_type=kshell fields > Db.noPK.find () {"_id": ObjectId ("5a50642b908e6b07a84472a2"), "name":

Use the DB. Table name. Update () Updates data The specified table must be present with the following syntax: Db.collection.update (criteria, objnew, Upsert, Multi) criteria:update query criteria, Similar to the SQL update query within where the