MongoDB

MongoDB is a document database, there are some specialized terms, similar to relational db, but there are differences, for example, collection similar to the relational DB table,document similar to the row,key/value pair similar to column. Document

(1) INSERT statement, INSERT statement is done by1, when inserting data, do not need to create a pre-set (cus), insert data will be generated automatically.2, a primary key (_ID) is created by default each time the data is inserted without a

Turn from: http://www.cnblogs.com/zhengyun_ustc/archive/2013/01/25/2875962.html from the MongoDB phased technical summary to extract and collate the 10 points that are helpful to everyone:1.mongodb table names and field names are unified in

Common directives1. Go to the heavyDb.runcommand ({distinct: ' person ', key: ' Home '});　　2. GroupingDb.runcommand ({group:{ns: Collection name, key: Grouped key, initial: initialization, $reduce: decomposition, Condition: condition, Finalize:

**First, to install MongoDB**1.: Http://www.mongodb.org/downloads2. Unzip to the directory you want to install , such as D:\mongodb3. Create folders d:\mongodb\data\db, D:\mongodb\data\log, respectively, to install the DB and log files, create a log

When you start MongoDB, you are prompted:Error while loading shared Libraries:libstdc++.so.6:cannot open Shared object file:no such file or directoryerror hint : missing shared library! Solution:1. Execution of OrdersYum Whatprovides

1 varMongostring ="Mongodb://jamesbing:[email protected]:27017";2 varHost =NewTmongodbhostmodel3 {4CollectionName ="ft_test",5ConnectionString =mongostring,6DatabaseName ="system_db"7 };8 9

Back up the specified library mongodump-h ip-d dbname-o dir//-h back with server ip-d followed by database name No then backup all libraries-o after specifying where to back up it is a directoryBack up all libraries mongodump-h Ip-o dirBack up the

wget ' Https://codeload.github.com/mongodb/mongo-php-driver/zip/master '-o/usr/local/src/mong_php.zipcd/usr/local/src/Unzip Mong_php.zipCD

Defined:Create a database new user with the Db.createuser () method and return a user repeat error if the user exists.Grammar:Db.createuser (user, Writeconcern)User This document creates identity authentication and access information about

One, download.XP system, 32-bit:Https://www.mongodb.org/dl/win32/i386Cases:Win32/mongodb-win32-i386-2.0.7.zipHttp://downloads.mongodb.org/win32/mongodb-win32-i386-2.0.7.zipSize about 17M.Win32/mongodb-win32-i386-3.2.7.zipHttp://downloads.mongodb.org/

MongoDB also learned these days, today configured under the environment, starting today to learn the MongoDB database.First, downloadSelect the development environment Https://www.mongodb.com/download-center to download in this URL and download it.

Import pymongo# Library Name db = Pymongo. Mongoclient (' 192.168.30.252 ', 27017). Bulk_example#test Collection Insert Db.test.insert_many ([{' I ': i} for I in Xrange (10000)]). Inserted_idsdb.test.count () # Organized large-scale data write bulk =

Ruby on Rails is well-integrated with MongoDB, the Gem pack:Address:https://rubygems.org/gems/mongoidDocumentation: https://docs.mongodb.com/ecosystem/tutorial/ruby-mongoid-tutorial/#ruby-mongoid-tutorialLatest queries that are also usedModel.where (

SummaryIn the actual development encountered updating the value of an array in a document, here is a record.The driver used here isUsing Mongodb.bson;Using Mongodb.driver;Related articlesGetting started with [MongoDB][MongoDB] additions and

#聚合查询from Pymongo Import mongoclientdb = mongoclient (' mongodb://10.0.0.9:27017/'). aggregation_example# Prepare Data result = Db.things.insert_many ([{"X": 1, "tags": ["Dog", "Cat"]}, {"X": 2, "tags": ["Cat"]}, {"X": 2,

To use MongoDB in C #, you first have to have a mongodb-supported C # version of the driver. The C # version of the driver seems to have many kinds, such as the official Samus. The idea of implementation is mostly similar. Here we use the officially

Database operation is nothing more than to increase, delete, change, check. This article mainly introduces adding, deleting and changing.1. IncreaseThe MongoDB insert operation is simple, using the keyword "Insert". Instance:1> Db.test.blog.insert ({

Oplog is the capped Collection, which allocates 5% of the free disk space by default.Look at the look of oplog.rs:rs_test:secondary> use localswitched to db localrs_test:secondary>  Db.oplog.rs.findOne (); {         "TS"  : timestamp (1465879171, 238

1. Download: http://www.mongodb.org/downloads2. Unzip it and put it in the directory where you want to install the MongoDB, we assume the/mongodb directory (win can also be installed with MSI file)3. Create the following directories and files