MongoDB

1. Go to the official website to download and install: Https://www.mongodb.com/download-center#atlas;Or: http://dl.mongodb.org/dl/win32/x86_64 here to download, and then select the appropriate version;2. After the download is complete, unzip to the

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.

Original blog address www.xiegaosheng.com/post/view?id=96;mongodb = new mongodb\driver\manager ("Mongodb://localhost : 27017 ");       $this->dbname =  $config [' dbname '];        $this->collection =  $cOnfig[' collection '];      

1. View all librariesShow DBS2. Switch database/New database Use MyDB3. View current LibraryDbIt is important to note that the This command does not immediately create a real entity library, but only when the data is inserted inside the library.4.

Create a databaseThe syntax format for MongoDB database creation is as follows:use DATABASE_NAMEIf the database does not exist, create the database, or switch to the specified database.If you want to see all the databases, you can use the show DBS

Installing MongoDBWhen you are finished installingNew folder, configuring DBPathCreate a new Data folder under the MongoDB folder and create a new DB folder under the Data folderStart the serviceInstall third-party

I. OverviewSharding is a method of allocating data on multiple machines. MongoDB uses shards to support very large data sets and high throughput operations. There are two ways to address system growth: vertical scaling and horizontal

　　1. To the official website, select the appropriate version to downloadHttps://www.mongodb.com/download-center#community2. Unzip　　　　tar -zxvf mongodb-linux-x86_64-ubuntu1604-3.4.0.tgz3. Move to the/usr/local/directory　　　　sudo mv -r mongodb-linux-x86

1. Environment Preparation1,Centos72,mongodb3.4. 93. Three machine IPs are:10.170.1.16, 10.170.1.18, 10.170.1.332, the installation of MONGDB databaseThe following operations are performed on three machines, respectively1.First download the mongodb

1. Download the installation packagewget http://fastdl.mongodb.org/linux/mongodb-linux-i686-1.8.2.tgzUnzip the package after download is completeTar zxf mongodb-linux-i686-1.8.2.tgz2. Install ready to move MongoDB to the/usr/local/server/mongdb

MongoDB is a nosql type of database, high-performance, easy to deploy, easy to use features in the IT industry is very popular.The following describes the installation of MongoDB, here we are installed under Linux, using the centos6.4 64-bit, you

#./mongod2018-04-15t18:52:36.352+0800 i control  [initandlisten] mongodb starting :  pid=36578 port=27017 dbpath=/data/db 64-bit host= Ibg-opensource-db-cwt132018-04-15t18:52:36.352+0800 i control  [initandlisten] db  version v3.6.22018-04-15t18:52:3

First, prefaceThe date type in MongoDB is no time zone concept, the default storage is Isodate ("2018-04-02t13:19:16.418z") This format of 0 time zone, eight hours later than Beijing time.There is a problem in the work, how to query the document

MongoDB has $lookup can do a long table queryAs an example,Db.orders.aggregate ([{$lookup: { from'inventory', "item", "sku", as"inventory_docs" }}])The above code means that the item field is taken from the order table as a query condition

1, create a new databaseUse Db_nameIf it does not exist, the new2. Querying all databasesShow DBS3. Delete DatabaseAfter entering this databaseDb.dropdatabase ()4. Insert collection data into a databaseThe collection of MongoDB is equivalent to

Query based on the length of a field (title) in the collectionDb.collections. Find true " This.title.length " })// Note that kanji is not a character Refresh the config information for the MONGOs cacheDb.admincommand ({"flushrouterconfig":1})//

Environment ConfigurationArchitecture: One master two from (three virtual machines)System version: CentOS Linux release 7.4.1708 (Core)MongoDB version: 3.0.15MongoDB InstallationThe following operations are performed on three virtual

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 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

MongoDB useUpdate () function updates dataDescribeIn this section we will begin to learn how to update the collection data in MongoDB.The update () function can be used for MONGODB data updates.Db.collection.update (criteria, objnew, Upsert,