MongoDB Introduction and Installation

Mongo DB is a non-relational database (NOSQL) that is currently very popular in the IT industry and is favored by current IT practitioners for flexible data storage. This is a brief introduction to the installation of Mongo DB, Mongo db, and the difference from a relational database.

Brief Introduction:

Mongo db data is grouped in a dataset, called a collection (collenction). Each collection has a unique identifying name in the database and can contain an unlimited number of documents. The concept of a collection is similar to a table in a relational database, unlike it does not need to define any schema.

MongoDB uses this data structure of Bson (Binary JSON) to store data and network data exchange,Bson not only supports more complex data types, but also features Schema-free (mode freedom), so to speak, Instead of defining any structure, we can store document objects of completely different structures in a single database.

The Document object, which exists in the form of a key-value pair. A key is used to uniquely identify a document, a string type, and a value can be a complex file type, such as a sentence, a picture, an array, a collection, and so on.

At the time of operation, Mongo DB does not require us to write SQL statements manually, the operation syntax of the Crud,shell command with the shell command is similar to JavaScript, it can be said that the bottom of the console query statement is done with JavaScript script.

MongoDB server can run on Linux, Windows and other platforms, support 32-bit and 64-bit applications, the default port is 27017.

MongoDB Installation:
1) I use the mongodb-win32-x86_64-2008plus-2.6.6.zip, unzip it, create the file path: E:\Program files\mongodb-2.6.6, the extracted files are copied to the folder. 2) Create the Data folder under the MongoDB folder, path: E:\Program files\mongodb\data 3) Create two folders in the Data folder for DB, log, path: E:\Program files\mongodb\data\db,e:\program files\mongodb\data\log4) Run Cmd.exe, enter DOS operating environmentgo to Bin directory:                     5) Create log filecommand: Mongod--logpath "E:\Program files\mongodb\data\log\log.txt"                    Log.txt file appears under the log folder           6) Create db filethe command is as follows: Mongod-dbpath "E:\Program files\mongodb\data\db"

After typing the following information, it means that your installation has been successful, you can enter the shell operation, the following folder is automatically generated under the DB folder:

run a Cmd.exe, enter the DOS environment, enter the command: Mongo.exe, after the link succeeds, collections:0 will automatically change to Collections:1, as follows:

This allows the shell to be manipulated.

differences from relational databases:

Summary:

Mongo DB is a good implementation of object-oriented thinking (Oo idea), in Mongo db each record is a document object. Mongo DB All data persistence operations do not require a developer to write SQL statements manually, and it is easy to implement CRUD operations by invoking the method directly.

MongoDB Introduction and Installation