[MongoDB] Get used to Mysql, try MongoDB (install, download and use)

[MongoDB] Get used to Mysql, try MongoDB (install, download and use)

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The information involved in the article comes from the Internet and personal summary, which is intended to summarize personal learning and experience. If there is any infringement, please contact me to delete it, thank you!

Introduction to MongoDB

MongoDB is written in C++ and is an open source database system based on distributed file storage.

In the case of high load, adding more nodes can ensure server performance.

MongoDB stores data as a document, and the data structure consists of key-value (key=>value) pairs. MongoDB documents are similar to JSON objects. Field values can include other documents, arrays and document arrays

MongoDB features

• MongoDB is a database oriented to document storage, which is relatively simple and easy to operate.
• You can create data mirroring locally or through the network, which makes MongoDB more scalable.
• If the load increases (more storage space and stronger processing power are required), it can be distributed on other nodes in the computer network. This is called sharding.
• Mongo supports rich query expressions. The query commands use JSON format tags to easily query the embedded objects and arrays in the document.
• MongoDb can use the update() command to replace the completed document (data) or some specified data fields.
• Map/reduce in Mongodb is mainly used for batch processing and aggregation of data.
• Map and Reduce. The Map function calls emit(key, value) to traverse all the records in the collection, and passes the key and value to the Reduce function for processing.
• GridFS is a built-in function in MongoDB that can be used to store a large number of small files.
• MongoDB allows scripts to be executed on the server side. You can write a function in Javascript and execute it directly on the server side. You can also store the definition of the function on the server side and call it directly next time.
• MongoDB supports various programming languages: RUBY, PYTHON, JAVA, C++, PHP, C# and many other languages.
• MongoDB is easy to install.
• Fast execution

MongoDB installation

Install under Windows

Download file installation

Download MongoDB address

Pay attention to choose the version corresponding to your computer

Whether to choose the graphical management interface

installation complete

Configuration

server-side mongod

bin directory

client mongo

Log file and data saving

start up

The .msi installation in the new version comes with a configuration file, so we only need to start it once.

Server: mongod

Client: mongo

Install under Mac

Download and install

The author is using mac, so the focus is still to download and install on mac

Enter /usr/local

cd /usr/local

download

sudo curl -O https://fastdl.mongodb.org/osx/mongodb-macos-x86_64-5.0.2.tgz

Unzip

sudo tar -zxvf mongodb-macos-x86_64-5.0.2.tgz

Rename to mongodb directory

sudo mv mongodb-macos-x86_64-5.0.2/ mongodb

Configure environment variables

Since it is in the form of downloading files from the Internet, if you want to use it quickly, you still need to add environment variables

export PATH=/usr/local/mongodb/bin:$PATH

Configure the running data directory and log directory

数据存放路径：
sudo mkdir -p /usr/local/var/mongodb

日志文件路径：
sudo mkdir -p /usr/local/var/log/mongodb

添加读写权限
sudo chown /usr/local/var/mongodb
sudo chown /usr/local/var/log/mongodb

start up

First start the server mongod

mongod --dbpath /usr/local/var/mongodb --logpath /usr/local/var/log/mongodb/mongo.log --fork

• --dbpath set data storage directory
• --logpath set the log storage directory
• 161443cfab6949 in the background

Check whether the mongod service is started:

ps aux | grep -v grep | grep mongod

Start the client mongo

mongo

The appearance of this interface indicates that the installation is successful

Graphical interface connection

It’s not a problem to use the terminal all the time. Use a graphical tool to connect and use, here DataGrip is used.

Create a new connection

There is nothing to say here. Initially, there is no password. Just connect directly. If a password is configured, please log in with the password.

After the connection is successful, this page will appear on this page

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