foreword
Yesterday, I used ubuntu22.04 to install the redis-5.0.5 service. Because the version is not compatible, it caused frequent problems, and finally solved it with the help of the teacher. This reminds me again of the importance of version compatibility
MongoDB installation and deployment
Because the ubuntu version used is 22.04, it cannot be installed and deployed according to the documents given by the teacher. Only by referring to a few blog posts can the problem to be solved be solved
First of all, we must pay attention to the compatibility between the ubuntu version and the database MongoDB version to be installed
Version display
formal process
Install the curl tool
Related commands:
apt install curl
Import the public key of MongoDB version 6.0 and check whether the public key is imported successfully
Related commands:
curl -fsSL https://www.mongodb.org/static/pgp/server-6.0.asc | sudo apt-key add -
apt-key list
Import the resource link of the MongoDB 6.0 software package to APT
Related commands:
echo "deb [ arch=amd64,arm64 ] https://repo.mongodb.org/apt/ubuntu focal/mongodb-org/6.0 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-6.0.list
sudo apt update
Install MongoDB
Before installing MongoDB, you must first install MongoDB's dependency libssl1.1 (use the curl command to install after installing curl)
The relevant commands are as follows:
curl -LO http://archive.ubuntu.com/ubuntu/pool/main/o/openssl/libssl1.1_1.1.1-1ubuntu2.1~18.04.20_amd64.deb
sudo dpkg -i ./libssl1.1_1.1.1-1ubuntu2.1~18.04.20_amd64.deb
sudo apt install mongodb-org
Start the MongoDB service and check the status of the MongoDB service
The relevant commands are as follows:
sudo systemctl start mongod
sudo systemctl status mongod
Add service to start mongodb at system startup:sudo systemctl enable mongod
Start MongoDB
It will be found that if the version is not considered, mongo --eval 'db.runCommand({connectionStatus: 1})'an error will be reported directly
Because the version is 6.0, you need to enter it in the terminal mongosh. This command is equivalent to the mongo command before version 6.0
At this time, you can enter the command line, entershow dbs
Related commands:
mongosh
View all databases in the MongoDB database:show dbs
Using the database that needs to be operated
can be understood as opening a database, or creating a new database (MongoDB does not need to create documents in advance, it is automatically created when used):use School
Add collection: db.createCollection(‘teacher’)(a collection is equivalent to a table in a mysql database)
View all collections in the current database:show collections
Insert data:db.teacher.insert({_id:1,sname:’张三’,sage:20})
Query all records:db.teacher.find()
Mongo database related operations
The version is 6.0, and its update operation has also changed, so I tried several times in the groping
Related commands:
Update operation:db.teacher.update({_id:1},{$set:{sname:'李四'}})
Query records with sname='Lisi':db.teacher.find({sname:'李四'})
Query the specified column sname data:db.teacher.find({},{sname:1})
AND condition query:db.teacher.find({sname:'李四',sage:21})
OR condition query:db.teacher.find({$or:[{sage:20},{sage:21}]})
Formatted output:db.teacher.find().pretty()
delete data:db.teacher.remove({sname:’李四’})
Delete collection:db.teacher.drop()
reference article
- https://blog.csdn.net/Lenhart001/article/details/127335370
- https://blog.csdn.net/majiayu000/article/details/126491116
- https://blog.csdn.net/dongkeai/article/details/127330013
summary
This is an experience article, for reference, don’t step on the pit~