MongoDB

Recommended Learning Books: MongoDB authoritative guideFirst, IntroductionMongoDB: A document-oriented database. (Not relational database)Its document-oriented data model enables it to automatically split data across multiple servers.Second, the

1.copy MongoDB to the specified serverTo the MongoDB official website http://www.mongodb.org/downloads download MongoDB, unzip and test the directory on the server that needs to be installed, and then configure. For example:[Email protected] ~]# scp-

ReadDb.collection.find ()db.users.find ( }}, 1 1 }). Limit (5). Sort ({age:1})Users are collection names and are searched from users;The age is the query criteria, filtering results, representing the value of the Lookup name field is greater

1, the principle of the replica setThe principle of the replica set is similar to the master-slave, the only difference is that when the primary node fails, the master-slave server will not automatically become the primary server, but to manually

1 Mongovue Usage 1.1 fuzzy queryHeader matching:{"title": New RegExp ("^ Prime Minister of the Week")}Any position matching:{"Published": {$gte: "2013-05-01", $lt: "2013-06-10"}, "title": New RegExp (". * Beijing. *")}1.2 Time period

I built a Replica sets + sharding test cluster environment under a Windows machine as my next experimental platform for MongoDB to further learn.Only one Windows machine, configuration scenario:1, 3 shards sharding2, each shard from 3 nodes

#encoding: utf-8__author__ = ' Administrator ' #import pymongofrom Pymongo Import mongoclient,geo2dimport sqlite3import sysimport psycopg2import ppygisimport cx_oracleimport datetimereload (sys ) #中文错误sys. setdefaultencoding ("Utf-8") #mongoclient =

Learning the front-end aspects of technology, dare not say something, but also a lot of experience, the front is a water pit, learning is always met with all kinds of pits, new technology endless dazzling people. For the purpose of the front-end

These days the project revision, time is tight, blog also did not follow, also hope everyone forgive.Well, today we share the basic operation of the index in MongoDB, we do not have to develop the daily development of the program to optimize

Mapping of _id fields:MongoDB requires that all document have a _id field.If we don't have an incoming _id field in use, it will create a objectid on its own.{"_id": ObjectId

Brief introduction:MongoDB is a product between a relational database and a non-relational database, and is the most versatile and most like relational database in a non-relational database. The data structure he supports is very loose and is a JSON-

A. MongoDB installation1. First download its installation package http://www.mongodb.org/on the official website of MongoDB. Download it according to your operating system.2. Establish two directories on the hard disk to store MongoDB installation

Insert operation:Give an example directlyImport Static Org.springframework.data.mongodb.core.query.Criteria.where; Import Static New person ("Bob", "= Mongotemplate.findone" ("The Where (" "Age"), the person. Class); There are several ways to

Installing MongoDB under Windows71. DownloadAddress: Http://www.mongodb.org/downloads (32-bit or 64-bit choice).I downloaded: mongodb-win32-x86_64-2.4.5.zip2. DecompressionPut the mongodb-win32-x86_64-2.4.5.zip in one place and unzip it. I put it in

1 Viewing the query plan Db.user.find ({"username": "xxx"}) . Explain () Db.doc.find ({"Es_y": "}"). Explain (){"Cursor": "Basiccursor","Ismultikey": false,"N": 0,"Nscannedobjects": 1,"Nscanned": 1,"Nscannedobjectsallplans": 1,"Nscannedallplans": 1,"

1. Search by Condition:Db.users.find ({"Name": "MM1"})The second parameter of 2.find can specify the field to return: Here 1 indicates the field to be displayed, and 0 indicates the field to be rejectedDb.users.find ({"Name": "MM1"},{"name": 1, "Age"

1.1 The specified key for all data is queried (name, age, country)Db.persons.find ({},{name:1,age:1,country:1,_id:0})2. Query criteria2. Query criteria2.1 Check out students aged between 25-27 yearsDb.persons.find ({age: {$gte: $lte: 27},{_id:0,age:1

A. Common query:1. Query a data: (more used to determine whether the DB has the current data, here is exactly match, fuzzy match using regex ...) Public pageurl getbyurl (String url) { return findOne (new Query (criteria.where ("url"). Is

Tornado + ansible + twisted + automatic system development for mongodb O & M (1) Some time ago I learned about ansible Configuration Management (http://blog.csdn.net/column/details/ansible.html anisble Configuration tool translation column), I feel

Tornado + ansible + twisted + automatic system development for mongodb O & M (1), ansiblemongodb Some time ago I learned about ansible Configuration Management (http://blog.csdn.net/column/details/ansible.html anisble Configuration tool translation