# **6,7Crud creating document**

1. db.tours.insertMany({},{})

2. db.tours.find()

3. query => db.tours.find({name:'Kathmanu'})

4. db.tours.find({price:297})

5. price below 200 => db.tours.find({price:{$lte:200} })//lte means less then.

​

db.tours.find({price:{$lte:200},rating:{$gte:4.8} })

//or query

db.tours.find({ $or:[{price:{$lte:500}}, {rating:{$gte:4.8}}] })

```

​

# 8)Crud updating documents

​

//filter and update

db.tours.updateOne({name:"kathmandu"}, {$set:{price:400}} )

​

​

# **Delete documents**

​

db.tours.deleteMany({rating:{$lt:4.8} })

​

//All CRUD operation and more...

​

show dbs

db // prints the current database

​

use <database_name>

​

show collections

​

db.coll.drop()    // removes the collection and its index definitions

db.dropDatabase() // double check that you are *NOT* on the PROD cluster... :-)

​

load("myScript.js") //Run JavaScript File

​

//CRUD - Create

db.coll.insertOne({name: "Max"})

db.coll.insert([{name: "Max"}, {name:"Alex"}]) // ordered bulk insert

db.coll.insert([{name: "Max"}, {name:"Alex"}], {ordered: false}) // unordered bulk insert

db.coll.insert({date: ISODate()})

db.coll.insert({name: "Max"}, {"writeConcern": {"w": "majority", "wtimeout": 5000}})

​

//CRUD - Read

db.coll.findOne() // returns a single document

db.coll.find()    // returns a cursor - show 20 results - "it" to display more

db.coll.find().pretty()

db.coll.find({name: "Max", age: 32}) // implicit logical "AND".

db.coll.find({date: ISODate("2020-09-25T13:57:17.180Z")})

db.coll.find({name: "Max", age: 32}).explain("executionStats") // or "queryPlanner" or "allPlansExecution"

db.coll.distinct("name")

db.coll.find({"year": {$gt: 1970}})

db.coll.find({"year": {$gte: 1970}})

db.coll.find({"year": {$lt: 1970}})

db.coll.find({"year": {$lte: 1970}})

db.coll.find({"year": {$ne: 1970}})

db.coll.find({"year": {$in: [1958, 1959]}})

db.coll.find({"year": {$nin: [1958, 1959]}})

​

//CRUD - Update

db.coll.update({"_id": 1}, {"year": 2016}) // WARNING! Replaces the entire document

db.coll.update({"_id": 1}, {$set: {"year": 2016, name: "Max"}})

db.coll.update({"_id": 1}, {$unset: {"year": 1}})

db.coll.update({"_id": 1}, {$rename: {"year": "date"} })

db.coll.update({"_id": 1}, {$inc: {"year": 5}})

db.coll.update({"_id": 1}, {$mul: {price: NumberDecimal("1.25"), qty: 2}})

db.coll.update({"_id": 1}, {$min: {"imdb": 5}})

db.coll.update({"_id": 1}, {$max: {"imdb": 8}})

db.coll.update({"_id": 1}, {$currentDate: {"lastModified": true}})

db.coll.update({"_id": 1}, {$currentDate: {"lastModified": {$type: "timestamp"}}})

​

​

//CRUD - Delete

db.coll.remove({name: "Max"})

db.coll.remove({name: "Max"}, {justOne: true})

db.coll.remove({}) // WARNING! Deletes all the docs but not the collection itself and its index definitions

db.coll.remove({name: "Max"}, {"writeConcern": {"w": "majority", "wtimeout": 5000}})

db.coll.findOneAndDelete({"name": "Max"})

​

// Create collection with a $jsonschema

db.createCollection("contacts", {

   validator: {$jsonSchema: {

      bsonType: "object",

      required: ["phone"],

      properties: {

         phone: {

            bsonType: "string",

            description: "must be a string and is required"

         },

         email: {

            bsonType: "string",

            pattern: "@mongodb\.com$",

            description: "must be a string and match the regular expression pattern"

         },

         status: {

            enum: [ "Unknown", "Incomplete" ],

            description: "can only be one of the enum values"

         }

      }

   }}

})