![Basic Operations In Mongo Shell
Commands Use
>db.COLLECTION_NAM
E.insert(document)
This command insert single data/document in specifient collection
and if collection is not already exist it will create one.
>db.COLLECTION_NAM
E.insert([document]) This command use to insert multiple documents, in the form of array
*if we don't specify the _id parameter, then MongoDB assigns a unique ObjectId for this
document.
*_id: ObjectId(4 bytes timestamp, 3 bytes machine id, 2 bytes process id, 3 bytes incrementer)](https://image.slidesharecdn.com/mongodb-170215074440/85/Mongo-db-12-320.jpg)
![Basic Operations In Mongo Shell
Commands Use
>db.mycol.remove()
If you don't specify deletion criteria, then MongoDB will
delete whole documents from the collection.
>db.mycol.find().pretty()
To query data from MongoDB collection, you need to use
MongoDB's find() method. To display the results in a
formatted way, you can use pretty() method.
>db.mycol.find( { $and: [ {key1:
value1}, {key2:value2} ] } ).pretty()
In the find() method, if you pass multiple keys by
separating them by ',' then MongoDB treats it
as AND condition.
>db.mycol.find( { $or: [ {key1:
value1}, {key2:value2} ] } ).pretty()
To query documents based on the OR condition, you
need to use $or keyword.](https://image.slidesharecdn.com/mongodb-170215074440/85/Mongo-db-14-320.jpg)
![Embedded Relationships
{
“name": “Nouman Ellahi",
“title": “Software engineer",
"address_ids": [123, 1234]
}
( [ { "_id": 123,
"area": "G9/4",
"city": "Islamabad",
"state": "Pakistan“ },
{ "_id": 1234,
"area": "Wapda Town",
"city": "Chicago",
"state": "Pakistan“ } ] )
Address Collection
Employee Collection](https://image.slidesharecdn.com/mongodb-170215074440/85/Mongo-db-16-320.jpg)
Mongo db
- 2. Introduction • Why No SQL • The Different Types Of NoSQL Database • Overview Of MongoDB • Basic Operations In Mongo Shell • More Concepts
- 3. Relational
- 4. The World Has Changed
- 6. Types of NoSQL Database Key Value Stores Column Stores Graph Stores Multi-Model Databases Document Stores
- 7. MongoDb Document are Typed String Fields Nested Document Array Geo-spatial Coordinates
- 8. RDBMS Vs MongoDB Terminology RDBMS MongoDB Database Database Table Collection Tuple/Row Document Column Field Table Join Embedded Documents Primary Key Primary Key (Default key _id provided by mongodb itself)
- 9. Why Document ? • Dynamic schema • Elimination of object relational mapping layer • Implicit demoralization of the data for performance.
- 10. Basic Operations In Mongo Shell Commands Use >use db_name This command create database with the name mydb, but not show newly created database in database list until unless it have at least one document in it >db This command shows currently selected database >show dbs This command shows database list >db.dropDatabase() Drop the database currently in use
- 11. Basic Operations In Mongo Shell Commands Use >db.createCollection(Na me,Options) This create a new collection in database which is currently under use example db.createCollection("mycol", { capped : true, autoIndexID : true, size : 6142800, max : 10000 } ) >db.COLLECTION_NAM E.drop() This command use to drop collection from database currently in use
- 12. Basic Operations In Mongo Shell Commands Use >db.COLLECTION_NAM E.insert(document) This command insert single data/document in specifient collection and if collection is not already exist it will create one. >db.COLLECTION_NAM E.insert([document]) This command use to insert multiple documents, in the form of array *if we don't specify the _id parameter, then MongoDB assigns a unique ObjectId for this document. *_id: ObjectId(4 bytes timestamp, 3 bytes machine id, 2 bytes process id, 3 bytes incrementer)
- 13. Basic Operations In Mongo Shell Commands Use >db.COLLECTION_NAME.update(S ELECTION_CRITERIA, UPDATED_DATA) This command updates the values in the existing document >db.COLLECTION_NAME.save({_id :ObjectId(),NEW_DATA}) This command replaces the existing document with the document passed in save() method. >db.COLLECTION_NAME.remove( DELLETION_CRITTERIA) Remove all the documents with deletion criteria >db.COLLECTION_NAME.remove( DELETION_CRITERIA,1) If there are multiple records and you want to delete only the first record, then set justOne parameter in remove() method.
- 14. Basic Operations In Mongo Shell Commands Use >db.mycol.remove() If you don't specify deletion criteria, then MongoDB will delete whole documents from the collection. >db.mycol.find().pretty() To query data from MongoDB collection, you need to use MongoDB's find() method. To display the results in a formatted way, you can use pretty() method. >db.mycol.find( { $and: [ {key1: value1}, {key2:value2} ] } ).pretty() In the find() method, if you pass multiple keys by separating them by ',' then MongoDB treats it as AND condition. >db.mycol.find( { $or: [ {key1: value1}, {key2:value2} ] } ).pretty() To query documents based on the OR condition, you need to use $or keyword.
- 15. Basic Operations In Mongo Shell Commands Use >db.mycol.createIndex({"title":1,"des cription":-1}) This command pass multiple fields, to create index on multiple fields. >db.COLLECTION_NAME.find({},{K EY:1}) In MongoDB, when you execute find() method, then it displays all fields of a document. To limit this, you need to set a list of fields with value 1 or 0. 1 is used to show the field while 0 is used to hide the fields. >db.COLLECTION_NAME.createInd ex({"title":1}) This command is use for giving index to specified field
- 16. Embedded Relationships { “name": “Nouman Ellahi", “title": “Software engineer", "address_ids": [123, 1234] } ( [ { "_id": 123, "area": "G9/4", "city": "Islamabad", "state": "Pakistan“ }, { "_id": 1234, "area": "Wapda Town", "city": "Chicago", "state": "Pakistan“ } ] ) Address Collection Employee Collection
- 17. More Concepts • Replica set • Sharding • Aggregation • GridFS
- 18. References and Recommended Readings • https://www.mongodb.com/presentations/back-to-basics-webinar-1- introduction-to-nosql • https://www.tutorialspoint.com/mongodb/index.htm • http://mongodb.github.io/mongo-java-driver/3.4/driver/getting- started/quick-start/ • https://docs.mongodb.com/manual/ • https://docs.mongodb.com/getting-started/node/insert/