![// save one user
$ db.users.save({ name: 'Chris' });
// save multiple users
$ db.users.save([{ name: 'Chris'}, { name: 'Holly' }]);
Create
Read
// show all users
$ db.users.find();
// find a specific user
$ db.users.find({ name: 'Holly' });](https://image.slidesharecdn.com/introductiontomongodb-160427112325/85/Introduction-to-mongo-db-19-320.jpg)
Introduction to mongo db
- 2. Agenda What is No-SQL? Why choose No-SQL? MongoDB Installation Guide Configuration Guide Common Database Commands CRUD in MongoDB
- 3. Hello! I am Vijay Shukla You can find me at: [email protected]
- 5. Not Only SQL Database. A form of Data Base Managment System which is non- relational. Systems are often schema less, avoid joins and easy to scale. Term NoSQL was coined in 1998, by Carlo Strozzi and again in early 2009 with no:sql east confrence. The better term would have been “No REL”, but NoSQL caught on. Redis, MongoDB, CouchDB, are type of NoSQL
- 8. MongoDB
- 9. MongoDB is an open source document database that provides high performance, high availability and automatic scaling. A record in MongoDB is a document, which is a data structure composed of fields and value pairs. MongoDB objects are very similar to JSON Objects. { Name:”vijay”, Age:23, }
- 11. 1. Import public key used by package management system a. sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv EA312927 1. Create a list file for MongoDB a. echo "deb http://repo.mongodb.org/apt/ubuntu precise/mongodb-org/3.2 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-3.2.list 1. Reload local package database a. sudo apt-get update 1. Install MongoDB packages a. sudo apt-get install -y mongodb-org 1. Install a specific release a. sudo apt-get install -y mongodb-org=3.2.4 mongodb-org- server=3.2.4 mongodb-org-shell=3.2.4 mongodb-org- mongos=3.2.4 mongodb-org-tools=3.2.4 Installation Guide
- 12. Starting MongoDB Service Mongod Once we have issue this command, MongoDB will start up and you should see: waiting for connections on port 27017 Connecting to Mongodb Service mongo
- 13. However, after all the steps above and mongodb installed in our machine, now if you try to start the mongodb service sudo service mongod start it will fail. "start: Unable to connect to Upstart: Failed to connect to socket /com/ubuntu/upstart: Connection refused” Failed to start mongod.service: Unit mongod.service failed to load: No such file or directory. You probably will be able to manually start it with sudo mongod -f /etc/mongod.conf - but in this way MongoDB will remain connected as long as that terminal is opened. Configuration Guide
- 14. 1. First we are going to change MongoDB’s default data store files from /var/lib/mongodb to/data/db 1. So, first create a folder /data/db in your machine. Run sudo mkdir -p /data/db 1. Now open the main mongo configuration file with sudo gedit /etc/mongod.conf and change the “dbpath” line as below 1. Replace dbpath=/var/lib/mongodb TO dbpath=/data/db and then save the file. 1. Then delete the old default /var/lib/mongodb 1. But the directory you created doesn’t have the correct permissions and ownership right after creation – it needs to be writable by the user who runs the MongoDB process. Hence we must make all the directories/files owned by mongod user 1. Run sudo chown -R mongodb:mongodb /data/db Configuration Guide
- 16. MongoDb Command
- 17. Basic Commands show dbs List All Databases use db_name Change DB or Create DB db Show current selected database name save Create both the database and collection find Read update Update remove Delete
- 18. ✖ Create db.collection.insert(<document>) db.collection.save(<document>) db.collection.update( <query>, <update>, { upsert: true }) ✖ Read db.collection.find( <query>, <projection> ) db.collection.findOne( <query>, <projection> ) ✖ Update db.collection.update( <query>, <update>, <options> ) ✖ Delete db.collection.remove( <query>, <justOne> )
- 19. // save one user $ db.users.save({ name: 'Chris' }); // save multiple users $ db.users.save([{ name: 'Chris'}, { name: 'Holly' }]); Create Read // show all users $ db.users.find(); // find a specific user $ db.users.find({ name: 'Holly' });
- 20. db.users.update({ name: 'Holly' }, { name: 'Holly Lloyd' }); Update Delete // remove all db.users.remove({}); // remove one db.users.remove({ name: 'Holly' });
- 24. ToBeContinue...
- 25. Theory of noSQL: CAP What is Sharding? ACID - BASE How to store large file (>16 MB) Grails Project with MONGODB What Next
Editor's Notes
- #8: Latency is a time interval between the stimulation and response.