Learn-MongoDB-in-1-Hour
Like any other database management language, MongoDB is based on a NoSQL database that is used for storing data in a key-value pair. Its work is based on the concept of document and collection. It is also an open-source, document-oriented, cross-platform database system that is written using C++.
what main Collections ?
Collections can be defined as a cluster of MongoDB documents that exist within a single database. You can relate this to that of a table in a relational database management system. MongoDB collections do not implement the concept of schema. Documents that have collections usually contain different fields. Typically, all the documents residing within a collection are meant for a comparable or related purpose.
what main document?
A document can be defined as a collection of key-value pairs that contain dynamic schema. Dynamic schema is something that documents of equal collection do not require for having the same collection of fields or construction, and a common field is capable of holding various types of data.
Learning
MongoDB tutorial for beginners
- MongoDB Overview
- MongoDB installation
- MongoShell installation
- Set Environment variable PATH
- VSCode with Mongosh
- Database creation and drop
insert
db.staff.insertOne(
{
name:"walid",
age:40,
Fulltime:false,
ReguisterDate:new Date(),
BirthDate:New Date(1984-8-2),
Corses:["ASP.NET","C#","MS SQl server"],
Address{street:"4 st.",City:"cairo",zipcode:123456}
})
data types
Sorting and limiting
db.staff.find()
db.staff.find().sort({name:1})
db.staff.find().sort({name:-1})
db.staff.find().sort({age:1})
db.staff.find().sort({age:-1})
db.staff.find().limit(1)
db.staff.find().limit(3)
db.staff.find().sort({age1}),limit(1)
db.staff.find().sort({age:-1}),limit(1)
find
get all
db.staff.find()
db.staff.find({name: "adam"})
db.staff.find({age: 25})
db.staff.find({FullTime: false})
.find({query},{Projection})
db.staff.find({age: 40}, {FullTime: false})
db.staff.find({}, {name: true})
db.staff.find({}, {_id: false, name: true})
db.staff.find({}, {_id: false, name: true, age: true})
update
db.staff.find()
- updateOne()
db.staff.updateOne({name:"adam"}, {$set:{FullTime:true}})
db.staff.updateOne({name:"adam"}, {$unset:{FullTime:""}})
updateMany()
db.staff.updateMany({}, {$set:{FullTime:true}})
db.staff.updateMany({FullTime:{$exists:false}}, {$set:{FullTime:true}})
Delete and import-export db
db.staff.deleteOne({name:"adam"})
db.staff.deleteMany({Fulltime:false})
db.staff.deleteMany({RegisterDate:{$exists:false}})
comparison operators
$eq : Values are equal.
$ne : Values are not equal.
$lt : Value is less than another value.
$lte : Value is less than or equal to another value.
$gt : Value is greater than another value.
$gte : Value is greater than or equal to another value.
$in : Value is matched within an array.
logical operators
$and: Returns documents where both queries match
$or: Returns documents where either query matches
$nor: Returns documents where both queries fail to match
$not: Returns documents where the query does not match