MongoDB Method: db.collection.find()

by

Summary

Method Namedb.collection.find()
UsageFind documents in a collection or view
Group read

Signature

db.collection.find(query, projection, options)

Usage

Find documents in a specific collection or a view. We can retrieve multiple documents from a collection(or view), based on some filters.

NOTES

  • This command returns a cursor, we can iterate over the items using the cursor.
  • Additionally we can use pretty() with the find, to format the output nicely, in the shell-
    db.collection.find().pretty()

Arguments

ParameterDescriptionTypeOptional
queryFilters for the document. Pass a document with the field and value.
To get all the documents, don’t send this param or send an empty document.		documentTrue
projectionFields that we want to return in the result.
Ignore this param, if you want to return all the fields.		documentTrue
optionsAdditional options.documentTrue

NOTES

  • To return all the documents use db.collection.find({}) or just db.collection.find().
  • We can use all the query operators like $and, $or, $eq, $gte, etc. in the query parameter.

Return Value

Return valueCase for the return valueType
A cursorOn success this method returns a cursor to the documents that matches the provided option criteria.cursor

NOTES

  • In Mongo Shell we get the result of the method directly. But as this command returnes a cursor, we can save the result of find method in MongoDB shell and then iterate over it-
    var customers = db.customer.find();
    while(customers.hasNext()) {
    print(customer.next());
    }

Examples

Here are a few examples of the method usage-

# MongoDB db.collection.find() method demo

# Insert some documents
bigboxcode> db.customer.insertMany([
    {
    "name": "Izabella Conroy",
    "age": 19,
    "phone": "108-679-2154",
    "address": {
      "street": "11 North Vineyard Drive",
      "city": "Pueblo West",
      "state": "CO",
      "postalCode": "81007"
    }
  },
  {
    "name": "Alisa Parker",
    "age": 72,
    "phone": "768-319-1054",
    "address": {
      "street": "8532 Ingalls Circle",
      "city": "Arvada",
      "state": "CO",
      "postalCode": "80003"
    }
  },
  {
    "name": "Eloise Weber",
    "age": 29,
    "phone": "618-357-2104",
    "address": {
      "street": "632 Belmar Drive",
      "city": "Edmond",
      "state": "OK",
      "postalCode": "73025"
    }
  }
])

output>
{
  acknowledged: true,
  insertedIds: {
    '0': ObjectId('65a8a2077de99c6d115fb6e5'),
    '1': ObjectId('65a8a2077de99c6d115fb6e6'),
    '2': ObjectId('65a8a2077de99c6d115fb6e7')
  }
}


# Find all document from cutomer collection
bigboxcode> db.customer.find()

output>
[
  {
    _id: ObjectId('65a8a2077de99c6d115fb6e5'),
    name: 'Izabella Conroy',
    age: 19,
    phone: '108-679-2154',
    address: {
      street: '11 North Vineyard Drive',
      city: 'Pueblo West',
      state: 'CO',
      postalCode: '81007'
    }
  },
  {
    _id: ObjectId('65a8a2077de99c6d115fb6e6'),
    name: 'Alisa Parker',
    age: 72,
    phone: '768-319-1054',
    address: {
      street: '8532 Ingalls Circle',
      city: 'Arvada',
      state: 'CO',
      postalCode: '80003'
    }
  },
  {
    _id: ObjectId('65a8a2077de99c6d115fb6e7'),
    name: 'Eloise Weber',
    age: 29,
    phone: '618-357-2104',
    address: {
      street: '632 Belmar Drive',
      city: 'Edmond',
      state: 'OK',
      postalCode: '73025'
    }
  }
]

# Apply fitler where age=29
bigboxcode> db.customer.find({age: 29})

output>
[
  {
    _id: ObjectId('65a8a2077de99c6d115fb6e7'),
    name: 'Eloise Weber',
    age: 29,
    phone: '618-357-2104',
    address: {
      street: '632 Belmar Drive',
      city: 'Edmond',
      state: 'OK',
      postalCode: '73025'
    }
  }
]

# Apply filter where age >= 29
bigboxcode> db.customer.find({age: {$gte: 29}})

output>
[
  {
    _id: ObjectId('65a8a2077de99c6d115fb6e6'),
    name: 'Alisa Parker',
    age: 72,
    phone: '768-319-1054',
    address: {
      street: '8532 Ingalls Circle',
      city: 'Arvada',
      state: 'CO',
      postalCode: '80003'
    }
  },
  {
    _id: ObjectId('65a8a2077de99c6d115fb6e7'),
    name: 'Eloise Weber',
    age: 29,
    phone: '618-357-2104',
    address: {
      street: '632 Belmar Drive',
      city: 'Edmond',
      state: 'OK',
      postalCode: '73025'
    }
  }
]

# Use $or operator for the query filter
bigboxcode> db.customer.find({$or: [{age: {$gt: 29}}, {"address.postalCode": "81007"}]})

output>
[
  {
    _id: ObjectId('65a8a2077de99c6d115fb6e5'),
    name: 'Izabella Conroy',
    age: 19,
    phone: '108-679-2154',
    address: {
      street: '11 North Vineyard Drive',
      city: 'Pueblo West',
      state: 'CO',
      postalCode: '81007'
    }
  },
  {
    _id: ObjectId('65a8a2077de99c6d115fb6e6'),
    name: 'Alisa Parker',
    age: 72,
    phone: '768-319-1054',
    address: {
      street: '8532 Ingalls Circle',
      city: 'Arvada',
      state: 'CO',
      postalCode: '80003'
    }
  }
]

# Set projection to get name and phone only
bigboxcode> db.customer.find({}, { name: 1, phone: true})

output>
[
  {
    _id: ObjectId('65a8a2077de99c6d115fb6e5'),
    name: 'Izabella Conroy',
    phone: '108-679-2154'
  },
  {
    _id: ObjectId('65a8a2077de99c6d115fb6e6'),
    name: 'Alisa Parker',
    phone: '768-319-1054'
  },
  {
    _id: ObjectId('65a8a2077de99c6d115fb6e7'),
    name: 'Eloise Weber',
    phone: '618-357-2104'
  }
]

# Set projection to ignore name and phone field
bigboxcode> db.customer.find({}, { name: false, phone: 0})

output>
[
  {
    _id: ObjectId('65a8a2077de99c6d115fb6e5'),
    age: 19,
    address: {
      street: '11 North Vineyard Drive',
      city: 'Pueblo West',
      state: 'CO',
      postalCode: '81007'
    }
  },
  {
    _id: ObjectId('65a8a2077de99c6d115fb6e6'),
    age: 72,
    address: {
      street: '8532 Ingalls Circle',
      city: 'Arvada',
      state: 'CO',
      postalCode: '80003'
    }
  },
  {
    _id: ObjectId('65a8a2077de99c6d115fb6e7'),
    age: 29,
    address: {
      street: '632 Belmar Drive',
      city: 'Edmond',
      state: 'OK',
      postalCode: '73025'
    }
  }
]

# Ignore nested property inside address
bigboxcode> db.customer.find({}, {"address.city": 0, age: 0, "address.street": false})

output>
[
  {
    _id: ObjectId('65a8a2077de99c6d115fb6e5'),
    name: 'Izabella Conroy',
    phone: '108-679-2154',
    address: { state: 'CO', postalCode: '81007' }
  },
  {
    _id: ObjectId('65a8a2077de99c6d115fb6e6'),
    name: 'Alisa Parker',
    phone: '768-319-1054',
    address: { state: 'CO', postalCode: '80003' }
  },
  {
    _id: ObjectId('65a8a2077de99c6d115fb6e7'),
    name: 'Eloise Weber',
    phone: '618-357-2104',
    address: { state: 'OK', postalCode: '73025' }
  }
]

# Sort by age in assending order
bigboxcode> db.customer.find().sort({age: 1})

output>
{
  _id: ObjectId("65b82c3618683e2d785ca6d1"),
  name: 'Izabella Conroy',
  age: 19,
  phone: '108-679-2154',
  address: {
    street: '11 North Vineyard Drive',
    city: 'Pueblo West',
    state: 'CO',
    postalCode: '81007'
  }
}
{
  _id: ObjectId("65b82c3618683e2d785ca6d3"),
  name: 'Eloise Weber',
  age: 29,
  phone: '618-357-2104',
  address: {
    street: '632 Belmar Drive',
    city: 'Edmond',
    state: 'OK',
    postalCode: '73025'
  }
}
{
  _id: ObjectId("65b82c3618683e2d785ca6d2"),
  name: 'Alisa Parker',
  age: 72,
  phone: '768-319-1054',
  address: {
    street: '8532 Ingalls Circle',
    city: 'Arvada',
    state: 'CO',
    postalCode: '80003'
  }
}

# Sort by age in descending order
bigboxcode> db.customer.find().sort({age: -1})

output>
{
  _id: ObjectId("65b82c3618683e2d785ca6d2"),
  name: 'Alisa Parker',
  age: 72,
  phone: '768-319-1054',
  address: {
    street: '8532 Ingalls Circle',
    city: 'Arvada',
    state: 'CO',
    postalCode: '80003'
  }
}
{
  _id: ObjectId("65b82c3618683e2d785ca6d3"),
  name: 'Eloise Weber',
  age: 29,
  phone: '618-357-2104',
  address: {
    street: '632 Belmar Drive',
    city: 'Edmond',
    state: 'OK',
    postalCode: '73025'
  }
}
{
  _id: ObjectId("65b82c3618683e2d785ca6d1"),
  name: 'Izabella Conroy',
  age: 19,
  phone: '108-679-2154',
  address: {
    street: '11 North Vineyard Drive',
    city: 'Pueblo West',
    state: 'CO',
    postalCode: '81007'
  }
}

# Apply limit
bigboxcode> db.customer.find().sort({age: 1}).limit(2)

output>
{
  _id: ObjectId("65b82c3618683e2d785ca6d1"),
  name: 'Izabella Conroy',
  age: 19,
  phone: '108-679-2154',
  address: {
    street: '11 North Vineyard Drive',
    city: 'Pueblo West',
    state: 'CO',
    postalCode: '81007'
  }
}
{
  _id: ObjectId("65b82c3618683e2d785ca6d3"),
  name: 'Eloise Weber',
  age: 29,
  phone: '618-357-2104',
  address: {
    street: '632 Belmar Drive',
    city: 'Edmond',
    state: 'OK',
    postalCode: '73025'
  }
}

# Skip certain results
bigboxcode> db.customer.find().sort({age: 1}).skip(2).limit(2)

output>
{
  _id: ObjectId("65b82c3618683e2d785ca6d2"),
  name: 'Alisa Parker',
  age: 72,
  phone: '768-319-1054',
  address: {
    street: '8532 Ingalls Circle',
    city: 'Arvada',
    state: 'CO',
    postalCode: '80003'
  }
}

NOTES

  • Use dot(.) to access a field in a nested object, like – address.street

Code Implementations

Here are the usage examples of the MongoDB method in NodeJS, Python, Golang, Java programming languages.

// MongoDB db.collection.find() method examples in Golang

package main

import (
	"context"
	"fmt"
	"os"
	"time"

	"go.mongodb.org/mongo-driver/bson"
	"go.mongodb.org/mongo-driver/mongo"
	"go.mongodb.org/mongo-driver/mongo/options"
)

const uri = "mongodb://bigboxuser:bigboxpass@localhost:27017/?maxPoolSize=20&w=majority"

func main() {
	// Initiate mongo client
	mongoClient, err := mongo.Connect(context.TODO(), options.Client().ApplyURI(uri))
	if err != nil {
		fmt.Println("MongoDB connection error: ", err)
		os.Exit(1)
	}

	// Initiate collection instance
	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
	defer cancel()

	customerCollection := mongoClient.Database("bigboxcode").Collection("customer")

	// Insert some documents
	insertResult, err := customerCollection.InsertMany(ctx, []interface{}{
		map[string]interface{}{
			"name":  "Izabella Conroy",
			"age":   19,
			"phone": "108-679-2154",
			"address": map[string]interface{}{
				"street":     "11 North Vineyard Drive",
				"city":       "Pueblo West",
				"state":      "CO",
				"postalCode": "81007",
			},
		},
		map[string]interface{}{
			"name":  "Alisa Parker",
			"age":   72,
			"phone": "768-319-1054",
			"address": map[string]interface{}{
				"street":     "8532 Ingalls Circle",
				"city":       "Arvada",
				"state":      "CO",
				"postalCode": "80003",
			},
		},
		map[string]interface{}{
			"name":  "Eloise Weber",
			"age":   29,
			"phone": "618-357-2104",
			"address": map[string]interface{}{
				"street":     "632 Belmar Drive",
				"city":       "Edmond",
				"state":      "OK",
				"postalCode": "73025",
			},
		},
	})

	if err != nil {
		fmt.Println(err)
	}

	fmt.Println("Command: db.customer.insertMany() | Result: ", insertResult)

	// Find all document from cutomer collection
	cursor, err := customerCollection.Find(ctx, bson.M{})
	if err != nil {
		fmt.Println(err)
	}

	var findResult []bson.M
	if err := cursor.All(ctx, &findResult); err != nil {
		fmt.Println(err)
	}

	fmt.Println("Command: db.customer.find() | Result: ", findResult)

	// Apply fitler where age=29
	cursor, err = customerCollection.Find(ctx, bson.M{"age": 29})
	if err != nil {
		fmt.Println(err)
	}

	if err := cursor.All(ctx, &findResult); err != nil {
		fmt.Println(err)
	}

	fmt.Println("Command: db.customer.find({"age": 29}) | Result: ", findResult)

	// Apply filter where age >= 29
	cursor, err = customerCollection.Find(ctx, bson.M{"age": bson.M{"$gte": 29}})
	if err != nil {
		fmt.Println(err)
	}

	if err := cursor.All(ctx, &findResult); err != nil {
		fmt.Println(err)
	}

	fmt.Println("Command: db.customer.find({age: {$gte: 29}}) | Result: ", findResult)

	// Use $or operator for the query filter
	filter := bson.M{"$or": []bson.M{{"age": bson.M{"$gt": 29}}, {"address.postalCode": "81007"}}}
	cursor, err = customerCollection.Find(ctx, filter)
	if err != nil {
		fmt.Println(err)
	}

	if err := cursor.All(ctx, &findResult); err != nil {
		fmt.Println(err)
	}

	fmt.Println("Command: db.customer.find({$or: [{age: {$gt: 29}}, {"address.postalCode": "81007"}]) | Result: ", findResult)

	// Set projection to get name and phone only
	findOptions := options.Find().SetProjection(bson.M{"name": 1, "phone": true})
	cursor, err = customerCollection.Find(ctx, bson.M{}, findOptions)
	if err != nil {
		fmt.Println(err)
	}

	if err := cursor.All(ctx, &findResult); err != nil {
		fmt.Println(err)
	}

	fmt.Println("Command: db.customer.find({}, { name: 1, phone: true}) | Result: ", findResult)

	// Set projection to ignore name and phone field
	findOptions = options.Find().SetProjection(bson.M{"name": false, "phone": 0})
	cursor, err = customerCollection.Find(ctx, bson.M{}, findOptions)
	if err != nil {
		fmt.Println(err)
	}

	if err := cursor.All(ctx, &findResult); err != nil {
		fmt.Println(err)
	}

	fmt.Println("Command: db.customer.find({}, { name: false, phone: 0}) | Result: ", findResult)

	// Ignore nested property inside address
	findOptions = options.Find().SetProjection(bson.M{"address.city": 0, "age": 0, "address.street": false})
	cursor, err = customerCollection.Find(ctx, bson.M{}, findOptions)
	if err != nil {
		fmt.Println(err)
	}

	if err := cursor.All(ctx, &findResult); err != nil {
		fmt.Println(err)
	}

	fmt.Println("Command: db.customer.find({}, {"address.city": 0, age: 0, "address.street": false}) | Result: ", findResult)

	// Sort by age in assending order
	findOptions = options.Find().SetSort(bson.M{"age": 1})
	cursor, err = customerCollection.Find(ctx, bson.M{}, findOptions)
	if err != nil {
		fmt.Println(err)
	}

	if err := cursor.All(ctx, &findResult); err != nil {
		fmt.Println(err)
	}

	fmt.Println("Command: db.customer.find().sort({age: 1}) | Result: ", findResult)

	// Sort by age in descending order
	findOptions = options.Find().SetSort(bson.M{"age": -1})
	cursor, err = customerCollection.Find(ctx, bson.M{}, findOptions)
	if err != nil {
		fmt.Println(err)
	}

	if err := cursor.All(ctx, &findResult); err != nil {
		fmt.Println(err)
	}

	fmt.Println("Command: db.customer.find().sort({age: -1}) | Result: ", findResult)

	// Apply limit
	findOptions = options.Find().SetSort(bson.M{"age": 1}).SetLimit(2)
	cursor, err = customerCollection.Find(ctx, bson.M{}, findOptions)
	if err != nil {
		fmt.Println(err)
	}

	if err := cursor.All(ctx, &findResult); err != nil {
		fmt.Println(err)
	}

	fmt.Println("Command: db.customer.find().sort({age: 1}).limit(2) | Result: ", findResult)

	// Skip certain results
	findOptions = options.Find().SetSort(bson.M{"age": 1}).SetLimit(2).SetSkip(2)
	cursor, err = customerCollection.Find(ctx, bson.M{}, findOptions)
	if err != nil {
		fmt.Println(err)
	}

	if err := cursor.All(ctx, &findResult); err != nil {
		fmt.Println(err)
	}

	fmt.Println("Command: db.customer.find().sort({age: 1}).skip(2).limit(2) | Result: ", findResult)
}

Output:

Command: db.customer.insertMany() | Result:  
&{[ObjectID("65b846cb2b0b9702bc2fc086") ObjectID("65b846cb2b0b9702bc2fc087") ObjectID("65b846cb2b0b9702bc2fc088")]}

Command: db.customer.find() | Result:  
[map[_id:ObjectID("65b846cb2b0b9702bc2fc086") address:map[city:Pueblo West postalCode:81007 state:CO street:11 North Vineyard Drive] age:19 name:Izabella Conroy phone:108-679-2154] map[_id:ObjectID("65b846cb2b0b9702bc2fc087") address:map[city:Arvada postalCode:80003 state:CO street:8532 Ingalls Circle] age:72 name:Alisa Parker phone:768-319-1054] map[_id:ObjectID("65b846cb2b0b9702bc2fc088") address:map[city:Edmond postalCode:73025 state:OK street:632 Belmar Drive] age:29 name:Eloise Weber phone:618-357-2104]]

Command: db.customer.find({"age": 29}) | Result:  
[map[_id:ObjectID("65b846cb2b0b9702bc2fc088") address:map[city:Edmond postalCode:73025 state:OK street:632 Belmar Drive] age:29 name:Eloise Weber phone:618-357-2104]]

Command: db.customer.find({age: {$gte: 29}}) | Result:  
[map[_id:ObjectID("65b846cb2b0b9702bc2fc087") address:map[city:Arvada postalCode:80003 state:CO street:8532 Ingalls Circle] age:72 name:Alisa Parker phone:768-319-1054] map[_id:ObjectID("65b846cb2b0b9702bc2fc088") address:map[city:Edmond postalCode:73025 state:OK street:632 Belmar Drive] age:29 name:Eloise Weber phone:618-357-2104]]

Command: db.customer.find({$or: [{age: {$gt: 29}}, {"address.postalCode": "81007"}]) | Result:  
[map[_id:ObjectID("65b846cb2b0b9702bc2fc086") address:map[city:Pueblo West postalCode:81007 state:CO street:11 North Vineyard Drive] age:19 name:Izabella Conroy phone:108-679-2154] map[_id:ObjectID("65b846cb2b0b9702bc2fc087") address:map[city:Arvada postalCode:80003 state:CO street:8532 Ingalls Circle] age:72 name:Alisa Parker phone:768-319-1054]]  

Command: db.customer.find({}, { name: 1, phone: true}) | Result:  
[map[_id:ObjectID("65b846cb2b0b9702bc2fc086") address:map[city:Pueblo West postalCode:81007 state:CO street:11 North Vineyard Drive] age:19 name:Izabella Conroy phone:108-679-2154] map[_id:ObjectID("65b846cb2b0b9702bc2fc087") address:map[city:Arvada postalCode:80003 state:CO street:8532 Ingalls Circle] age:72 name:Alisa Parker phone:768-319-1054] map[_id:ObjectID("65b846cb2b0b9702bc2fc088") name:Eloise Weber phone:618-357-2104]]
Command: db.customer.find({}, { name: false, phone: 0}) | Result:  [map[_id:ObjectID("65b846cb2b0b9702bc2fc086") address:map[city:Pueblo West postalCode:81007 state:CO street:11 North Vineyard Drive] age:19 name:Izabella Conroy phone:108-679-2154] map[_id:ObjectID("65b846cb2b0b9702bc2fc087") address:map[city:Arvada postalCode:80003 state:CO street:8532 Ingalls Circle] age:72 name:Alisa Parker phone:768-319-1054] map[_id:ObjectID("65b846cb2b0b9702bc2fc088") address:map[city:Edmond postalCode:73025 state:OK street:632 Belmar Drive] age:29 name:Eloise Weber phone:618-357-2104]]

Command: db.customer.find({}, {"address.city": 0, age: 0, "address.street": false}) | Result:  
[map[_id:ObjectID("65b846cb2b0b9702bc2fc086") address:map[postalCode:81007 state:CO] age:19 name:Izabella Conroy phone:108-679-2154] map[_id:ObjectID("65b846cb2b0b9702bc2fc087") address:map[postalCode:80003 state:CO] age:72 name:Alisa Parker phone:768-319-1054] map[_id:ObjectID("65b846cb2b0b9702bc2fc088") address:map[postalCode:73025 state:OK] age:29 name:Eloise Weber phone:618-357-2104]]
Command: db.customer.find().sort({age: 1}) | Result:  [map[_id:ObjectID("65b846cb2b0b9702bc2fc086") address:map[city:Pueblo West postalCode:81007 state:CO street:11 North Vineyard Drive] age:19 name:Izabella Conroy phone:108-679-2154] map[_id:ObjectID("65b846cb2b0b9702bc2fc088") address:map[city:Edmond postalCode:73025 state:OK street:632 Belmar Drive] age:29 name:Eloise Weber phone:618-357-2104] map[_id:ObjectID("65b846cb2b0b9702bc2fc087") address:map[city:Arvada postalCode:80003 state:CO street:8532 Ingalls Circle] age:72 name:Alisa Parker phone:768-319-1054]]

Command: db.customer.find().sort({age: -1}) | Result:  
[map[_id:ObjectID("65b846cb2b0b9702bc2fc087") address:map[city:Arvada postalCode:80003 state:CO street:8532 Ingalls Circle] age:72 name:Alisa Parker phone:768-319-1054] map[_id:ObjectID("65b846cb2b0b9702bc2fc088") address:map[city:Edmond postalCode:73025 state:OK street:632 Belmar Drive] age:29 name:Eloise Weber phone:618-357-2104] map[_id:ObjectID("65b846cb2b0b9702bc2fc086") address:map[city:Pueblo West postalCode:81007 state:CO street:11 North Vineyard Drive] age:19 name:Izabella Conroy phone:108-679-2154]]

Command: db.customer.find().sort({age: 1}).limit(2) | Result:  
[map[_id:ObjectID("65b846cb2b0b9702bc2fc086") address:map[city:Pueblo West postalCode:81007 state:CO street:11 North Vineyard Drive] age:19 name:Izabella Conroy phone:108-679-2154] map[_id:ObjectID("65b846cb2b0b9702bc2fc088") address:map[city:Edmond postalCode:73025 state:OK street:632 Belmar Drive] age:29 name:Eloise Weber phone:618-357-2104]]
Command: db.customer.find().sort({age: 1}).skip(2).limit(2) | Result:  [map[_id:ObjectID("65b846cb2b0b9702bc2fc087") address:map[city:Arvada postalCode:80003 state:CO street:8532 Ingalls Circle] age:72 name:Alisa Parker phone:768-319-1054]]

NOTES

  • Use the “Find()” method from “mongo-go-driver“
  • Signature of the method-
    • Find(ctx, filter, options)
// db.collection.find() method example in NodeJS

import { MongoClient } from "mongodb";

// Define MongoDB connection URI
const uri = "mongodb://bigboxuser:bigboxpass@127.0.0.1:27017";

// Create a client
const mongo = new MongoClient(uri);

await mongo.connect();

const database = mongo.db("bigboxcode");
const customerCollection = database.collection("customer");

// Insert some documents
let commandResult = await customerCollection.insertMany([
  {
    name: "Izabella Conroy",
    age: 19,
    phone: "108-679-2154",
    address: {
      street: "11 North Vineyard Drive",
      city: "Pueblo West",
      state: "CO",
      postalCode: "81007",
    },
  },
  {
    name: "Alisa Parker",
    age: 72,
    phone: "768-319-1054",
    address: {
      street: "8532 Ingalls Circle",
      city: "Arvada",
      state: "CO",
      postalCode: "80003",
    },
  },
  {
    name: "Eloise Weber",
    age: 29,
    phone: "618-357-2104",
    address: {
      street: "632 Belmar Drive",
      city: "Edmond",
      state: "OK",
      postalCode: "73025",
    },
  },
]);

console.log("Command: db.customer.insertMany() | Result: ", commandResult);

// Find all document from cutomer collection
commandResult = await customerCollection.find().toArray();

console.log("Command: db.customer.find() | Result: ", commandResult);

// Apply fitler where age=29
commandResult = await customerCollection.find({ age: 29 }).toArray();

console.log("Command: db.customer.find() | Result: ", commandResult);

// Apply filter where age >= 29
commandResult = await customerCollection.find({ age: { $gte: 29 } }).toArray();

console.log(
  "Command: db.customer.find({age: {$gte: 29}}) | Result: ",
  commandResult
);

// Use $or operator for the query filter
commandResult = await customerCollection
  .find({ $or: [{ age: { $gt: 29 } }, { "address.postalCode": "81007" }] })
  .toArray();

console.log(
  'Command: db.customer.find({$or: [{age: {$gt: 29}}, {"address.postalCode": "81007"}]) | Result: ',
  commandResult
);

// Set projection to get name and phone only
commandResult = await customerCollection
  .find({}, { name: 1, phone: true })
  .toArray();

console.log(
  "Command: db.customer.find({}, { name: 1, phone: true}) | Result: ",
  commandResult
);

// Set projection to ignore name and phone field
commandResult = await customerCollection
  .find({}, { name: false, phone: 0 })
  .toArray();

console.log(
  "Command: db.customer.find({}, { name: false, phone: 0}) | Result: ",
  commandResult
);

// Ignore nested property inside address
commandResult = await customerCollection
  .find({}, { "address.city": 0, age: 0, "address.street": false })
  .toArray();

console.log(
  'Command: db.customer.find({}, {"address.city": 0, age: 0, "address.street": false}) | Result: ',
  commandResult
);

// Sort by age in assending order
commandResult = await customerCollection.find().sort({age: 1}).toArray();

console.log(
  'Command: db.customer.find().sort({age: 1}) | Result: ',
  commandResult
);

// Sort by age in descending order
commandResult = await customerCollection.find().sort({age: -1}).toArray();

console.log(
  'Command: db.customer.find().sort({age: -1}) | Result: ',
  commandResult
);

// Apply limit
commandResult = await customerCollection.find().sort({age: 1}).limit(2).toArray();

console.log(
  'Command: db.customer.find().sort({age: 1}).limit(2) | Result: ',
  commandResult
);

// Skip certain results
commandResult = await customerCollection.find().sort({age: 1}).skip(2).limit(2).toArray();

console.log(
  'Command: db.customer.find().sort({age: 1}).skip(2).limit(2) | Result: ',
  commandResult
);

// Close connection
await mongo.close();

process.exit(0);

Output:

Command: db.customer.insertMany() | Result:  {
  acknowledged: true,
  insertedCount: 3,
  insertedIds: {
    '0': new ObjectId('65b82fa52f36a58c20a835ab'),
    '1': new ObjectId('65b82fa52f36a58c20a835ac'),
    '2': new ObjectId('65b82fa52f36a58c20a835ad')
  }
}

Command: db.customer.find() | Result:  [
  {
    _id: new ObjectId('65b82fa52f36a58c20a835ab'),
    name: 'Izabella Conroy',
    age: 19,
    phone: '108-679-2154',
    address: {
      street: '11 North Vineyard Drive',
      city: 'Pueblo West',
      state: 'CO',
      postalCode: '81007'
    }
  },
  {
    _id: new ObjectId('65b82fa52f36a58c20a835ac'),
    name: 'Alisa Parker',
    age: 72,
    phone: '768-319-1054',
    address: {
      street: '8532 Ingalls Circle',
      city: 'Arvada',
      state: 'CO',
      postalCode: '80003'
    }
  },
  {
    _id: new ObjectId('65b82fa52f36a58c20a835ad'),
    name: 'Eloise Weber',
    age: 29,
    phone: '618-357-2104',
    address: {
      street: '632 Belmar Drive',
      city: 'Edmond',
      state: 'OK',
      postalCode: '73025'
    }
  }
]

Command: db.customer.find() | Result:  [
  {
    _id: new ObjectId('65b82fa52f36a58c20a835ad'),
    name: 'Eloise Weber',
    age: 29,
    phone: '618-357-2104',
    address: {
      street: '632 Belmar Drive',
      city: 'Edmond',
      state: 'OK',
      postalCode: '73025'
    }
  }
]

Command: db.customer.find({age: {$gte: 29}}) | Result:  [
  {
    _id: new ObjectId('65b82fa52f36a58c20a835ac'),
    name: 'Alisa Parker',
    age: 72,
    phone: '768-319-1054',
    address: {
      street: '8532 Ingalls Circle',
      city: 'Arvada',
      state: 'CO',
      postalCode: '80003'
    }
  },
  {
    _id: new ObjectId('65b82fa52f36a58c20a835ad'),
    name: 'Eloise Weber',
    age: 29,
    phone: '618-357-2104',
    address: {
      street: '632 Belmar Drive',
      city: 'Edmond',
      state: 'OK',
      postalCode: '73025'
    }
  }
]

Command: db.customer.find({$or: [{age: {$gt: 29}}, {"address.postalCode": "81007"}]) | Result:  [
  {
    _id: new ObjectId('65b82fa52f36a58c20a835ab'),
    name: 'Izabella Conroy',
    age: 19,
    phone: '108-679-2154',
    address: {
      street: '11 North Vineyard Drive',
      city: 'Pueblo West',
      state: 'CO',
      postalCode: '81007'
    }
  },
  {
    _id: new ObjectId('65b82fa52f36a58c20a835ac'),
    name: 'Alisa Parker',
    age: 72,
    phone: '768-319-1054',
    address: {
      street: '8532 Ingalls Circle',
      city: 'Arvada',
      state: 'CO',
      postalCode: '80003'
    }
  }
]
Command: db.customer.find({}, { name: 1, phone: true}) | Result:  [
  {
    _id: new ObjectId('65b82fa52f36a58c20a835ab'),
    name: 'Izabella Conroy',
    age: 19,
    phone: '108-679-2154',
    address: {
      street: '11 North Vineyard Drive',
      city: 'Pueblo West',
      state: 'CO',
      postalCode: '81007'
    }
  },
  {
    _id: new ObjectId('65b82fa52f36a58c20a835ac'),
    name: 'Alisa Parker',
    age: 72,
    phone: '768-319-1054',
    address: {
      street: '8532 Ingalls Circle',
      city: 'Arvada',
      state: 'CO',
      postalCode: '80003'
    }
  },
  {
    _id: new ObjectId('65b82fa52f36a58c20a835ad'),
    name: 'Eloise Weber',
    age: 29,
    phone: '618-357-2104',
    address: {
      street: '632 Belmar Drive',
      city: 'Edmond',
      state: 'OK',
      postalCode: '73025'
    }
  }
]

Command: db.customer.find({}, { name: false, phone: 0}) | Result:  [
  {
    _id: new ObjectId('65b82fa52f36a58c20a835ab'),
    name: 'Izabella Conroy',
    age: 19,
    phone: '108-679-2154',
    address: {
      street: '11 North Vineyard Drive',
      city: 'Pueblo West',
      state: 'CO',
      postalCode: '81007'
    }
  },
  {
    _id: new ObjectId('65b82fa52f36a58c20a835ac'),
    name: 'Alisa Parker',
    age: 72,
    phone: '768-319-1054',
    address: {
      street: '8532 Ingalls Circle',
      city: 'Arvada',
      state: 'CO',
      postalCode: '80003'
    }
  },
  {
    _id: new ObjectId('65b82fa52f36a58c20a835ad'),
    name: 'Eloise Weber',
    age: 29,
    phone: '618-357-2104',
    address: {
      street: '632 Belmar Drive',
      city: 'Edmond',
      state: 'OK',
      postalCode: '73025'
    }
  }
]

Command: db.customer.find({}, {"address.city": 0, age: 0, "address.street": false}) | Result:  [
  {
    _id: new ObjectId('65b82fa52f36a58c20a835ab'),
    name: 'Izabella Conroy',
    age: 19,
    phone: '108-679-2154',
    address: {
      street: '11 North Vineyard Drive',
      city: 'Pueblo West',
      state: 'CO',
      postalCode: '81007'
    }
  },
  {
    _id: new ObjectId('65b82fa52f36a58c20a835ac'),
    name: 'Alisa Parker',
    age: 72,
    phone: '768-319-1054',
    address: {
      street: '8532 Ingalls Circle',
      city: 'Arvada',
      state: 'CO',
      postalCode: '80003'
    }
  },
  {
    _id: new ObjectId('65b82fa52f36a58c20a835ad'),
    name: 'Eloise Weber',
    age: 29,
    phone: '618-357-2104',
    address: {
      street: '632 Belmar Drive',
      city: 'Edmond',
      state: 'OK',
      postalCode: '73025'
    }
  }
]

Command: db.customer.find().sort({age: 1}) | Result:  [
  {
    _id: new ObjectId('65b82fa52f36a58c20a835ab'),
    name: 'Izabella Conroy',
    age: 19,
    phone: '108-679-2154',
    address: {
      street: '11 North Vineyard Drive',
      city: 'Pueblo West',
      state: 'CO',
      postalCode: '81007'
    }
  },
  {
    _id: new ObjectId('65b82fa52f36a58c20a835ad'),
    name: 'Eloise Weber',
    age: 29,
    phone: '618-357-2104',
    address: {
      street: '632 Belmar Drive',
      city: 'Edmond',
      state: 'OK',
      postalCode: '73025'
    }
  },
  {
    _id: new ObjectId('65b82fa52f36a58c20a835ac'),
    name: 'Alisa Parker',
    age: 72,
    phone: '768-319-1054',
    address: {
      street: '8532 Ingalls Circle',
      city: 'Arvada',
      state: 'CO',
      postalCode: '80003'
    }
  }
]

Command: db.customer.find().sort({age: -1}) | Result:  [
  {
    _id: new ObjectId('65b82fa52f36a58c20a835ac'),
    name: 'Alisa Parker',
    age: 72,
    phone: '768-319-1054',
    address: {
      street: '8532 Ingalls Circle',
      city: 'Arvada',
      state: 'CO',
      postalCode: '80003'
    }
  },
  {
    _id: new ObjectId('65b82fa52f36a58c20a835ad'),
    name: 'Eloise Weber',
    age: 29,
    phone: '618-357-2104',
    address: {
      street: '632 Belmar Drive',
      city: 'Edmond',
      state: 'OK',
      postalCode: '73025'
    }
  },
  {
    _id: new ObjectId('65b82fa52f36a58c20a835ab'),
    name: 'Izabella Conroy',
    age: 19,
    phone: '108-679-2154',
    address: {
      street: '11 North Vineyard Drive',
      city: 'Pueblo West',
      state: 'CO',
      postalCode: '81007'
    }
  }
]

Command: db.customer.find().sort({age: 1}).limit(2) | Result:  [
  {
    _id: new ObjectId('65b82fa52f36a58c20a835ab'),
    name: 'Izabella Conroy',
    age: 19,
    phone: '108-679-2154',
    address: {
      street: '11 North Vineyard Drive',
      city: 'Pueblo West',
      state: 'CO',
      postalCode: '81007'
    }
  },
  {
    _id: new ObjectId('65b82fa52f36a58c20a835ad'),
    name: 'Eloise Weber',
    age: 29,
    phone: '618-357-2104',
    address: {
      street: '632 Belmar Drive',
      city: 'Edmond',
      state: 'OK',
      postalCode: '73025'
    }
  }
]

Command: db.customer.find().sort({age: 1}).skip(2).limit(2) | Result:  [
  {
    _id: new ObjectId('65b82fa52f36a58c20a835ac'),
    name: 'Alisa Parker',
    age: 72,
    phone: '768-319-1054',
    address: {
      street: '8532 Ingalls Circle',
      city: 'Arvada',
      state: 'CO',
      postalCode: '80003'
    }
  }
]

NOTES

  • Use NodeJS “find()” method from the package “mongodb“.
  • Method signatures are-
    • find(): FindCursor<WithId<TSchema>>
    • find(filter: Filter<TSchema>, options?: FindOptions): FindCursor<WithId<TSchema>>
    • find<T extends Document>(filter: Filter<TSchema>, options?: FindOptions): FindCursor<T>
  • Definition of FindOptions–

    interface FindOptions<TSchema extends Document = Document> extends Omit<CommandOperationOptions, 'writeConcern'> {
        limit?: number;
        sort?: Sort;
        projection?: Document;
        skip?: number;
        hint?: Hint;
        timeout?: boolean;
        tailable?: boolean;
        awaitData?: boolean;
        batchSize?: number;
        returnKey?: boolean;
        min?: Document;
        max?: Document;
        maxTimeMS?: number;
        maxAwaitTimeMS?: number;
        noCursorTimeout?: boolean;
        collation?: CollationOptions;
        allowDiskUse?: boolean;
        singleBatch?: boolean;
        allowPartialResults?: boolean;
        showRecordId?: boolean;
        let?: Document;
        oplogReplay?: boolean;
    }
  • Definition of FindCursor–

    class FindCursor<TSchema = any> extends AbstractCursor<TSchema> {    
        clone(): FindCursor<TSchema>;
        map<T>(transform: (doc: TSchema) => T): FindCursor<T>;
        count(options?: CountOptions): Promise<number>;
        explain(verbosity?: ExplainVerbosityLike): Promise<Document>;
        filter(filter: Document): this;
        hint(hint: Hint): this;
        min(min: Document): this;
        max(max: Document): this;
        returnKey(value: boolean): this;
        showRecordId(value: boolean): this;
        addQueryModifier(name: string, value: string | boolean | number | Document): this;
      comment(value: string): this;
        maxAwaitTimeMS(value: number): this;
        maxTimeMS(value: number): this;
        project<T extends Document = Document>(value: Document): FindCursor<T>;
        sort(sort: Sort | string, direction?: SortDirection): this;
        allowDiskUse(allow?: boolean): this;
        collation(value: CollationOptions): this;
        limit(value: number): this;
        skip(value: number): this;
    }
# db.collection.find() method example in Python

from pymongo import MongoClient

# Create MongoDB client
mongo_client = MongoClient("mongodb://bigboxuser:bigboxpass@127.0.0.1:27017/")
# Select database and collection
mongo_database = mongo_client.bigboxcode
customer_collection = mongo_database.customer


# Insert some documents
command_result = customer_collection.insert_many([
    {
        "name": "Izabella Conroy",
        "age": 19,
        "phone": "108-679-2154",
        "address": {
            "street": "11 North Vineyard Drive",
            "city": "Pueblo West",
            "state": "CO",
            "postalCode": "81007",
        },
    },
    {
        "name": "Alisa Parker",
        "age": 72,
        "phone": "768-319-1054",
        "address": {
            "street": "8532 Ingalls Circle",
            "city": "Arvada",
            "state": "CO",
            "postalCode": "80003",
        },
    },
    {
        "name": "Eloise Weber",
        "age": 29,
        "phone": "618-357-2104",
        "address": {
            "street": "632 Belmar Drive",
            "city": "Edmond",
            "state": "OK",
            "postalCode": "73025",
        },
    },
])

print("Command: db.customer.insertMany() | Result: ", command_result.inserted_ids)

# Find all documents from the customer collection
command_result = customer_collection.find()

print("Command: db.customer.find() | Result: ", list(command_result))

# Apply filter where age=29
command_result = customer_collection.find({"age": 29})

print("Command: db.customer.find({"age": 29}) | Result: ", list(command_result))

# Apply filter where age >= 29
command_result = customer_collection.find({"age": {"$gte": 29}})

print("Command: db.customer.find({age: {$gte: 29}}) | Result: ", list(command_result))

# Use $or operator for the query filter
command_result = customer_collection.find({"$or": [{"age": {"$gt": 29}}, {"address.postalCode": "81007"}]})

print('Command: db.customer.find({$or: [{age: {$gt: 29}}, {"address.postalCode": "81007"}]) | Result: ', list(command_result))

# Set projection to get name and phone only
command_result = customer_collection.find({}, {"name": 1, "phone": True})

print("Command: db.customer.find({}, { name: 1, phone: true}) | Result: ", list(command_result))

# Set projection to ignore name and phone fields
command_result = customer_collection.find({}, {"name": False, "phone": 0})

print("Command: db.customer.find({}, { name: false, phone: 0}) | Result: ", list(command_result))

# Ignore nested property inside address
command_result = customer_collection.find({}, {"address.city": 0, "age": 0, "address.street": False})

print('Command: db.customer.find({}, {"address.city": 0, age: 0, "address.street": false}) | Result: ', list(command_result))

# Sort by age in ascending order
command_result = customer_collection.find().sort("age", 1)

print('Command: db.customer.find().sort({age: 1}) | Result: ', list(command_result))

# Sort by age in descending order
command_result = customer_collection.find().sort("age", -1)

print('Command: db.customer.find().sort({age: -1}) | Result: ', list(command_result))

# Apply limit
command_result = customer_collection.find().sort("age", 1).limit(2)

print('Command: db.customer.find().sort({age: 1}).limit(2) | Result: ', list(command_result))

# Skip certain results
command_result = customer_collection.find().sort("age", 1).skip(2).limit(2)

print('Command: db.customer.find().sort({age: 1}).skip(2).limit(2) | Result: ', list(command_result))

# Close connection
mongo_client.close()

Output:

Command: db.customer.insertMany() | Result:  
[ObjectId('65b84db62cbad0a182ed0573'), ObjectId('65b84db62cbad0a182ed0574'), ObjectId('65b84db62cbad0a182ed0575')]
Command: db.customer.find() | Result:  [{'_id': ObjectId('65b84db62cbad0a182ed0573'), 'name': 'Izabella Conroy', 'age': 19, 'phone': '108-679-2154', 'address': {'street': '11 North Vineyard Drive', 'city': 'Pueblo West', 'state': 'CO', 'postalCode': '81007'}}, {'_id': ObjectId('65b84db62cbad0a182ed0574'), 'name': 'Alisa Parker', 'age': 72, 'phone': '768-319-1054', 'address': {'street': '8532 Ingalls Circle', 'city': 'Arvada', 'state': 'CO', 'postalCode': '80003'}}, {'_id': ObjectId('65b84db62cbad0a182ed0575'), 'name': 'Eloise Weber', 'age': 29, 'phone': '618-357-2104', 'address': {'street': '632 Belmar Drive', 'city': 'Edmond', 'state': 'OK', 'postalCode': '73025'}}]

Command: db.customer.find({"age": 29}) | Result:  
[{'_id': ObjectId('65b84db62cbad0a182ed0575'), 'name': 'Eloise Weber', 'age': 29, 'phone': '618-357-2104', 'address': {'street': '632 Belmar Drive', 'city': 'Edmond', 'state': 'OK', 'postalCode': '73025'}}]        

Command: db.customer.find({age: {$gte: 29}}) | Result:  
[{'_id': ObjectId('65b84db62cbad0a182ed0574'), 'name': 'Alisa Parker', 'age': 72, 'phone': '768-319-1054', 'address': {'street': '8532 Ingalls Circle', 'city': 'Arvada', 'state': 'CO', 'postalCode': '80003'}}, {'_id': ObjectId('65b84db62cbad0a182ed0575'), 'name': 'Eloise Weber', 'age': 29, 'phone': '618-357-2104', 'address': {'street': '632 Belmar Drive', 'city': 'Edmond', 'state': 'OK', 'postalCode': '73025'}}]

Command: db.customer.find({$or: [{age: {$gt: 29}}, {"address.postalCode": "81007"}]) | Result:  
[{'_id': ObjectId('65b84db62cbad0a182ed0573'), 'name': 'Izabella Conroy', 'age': 19, 'phone': '108-679-2154', 'address': {'street': '11 North Vineyard Drive', 'city': 'Pueblo West', 'state': 'CO', 'postalCode': '81007'}}, {'_id': ObjectId('65b84db62cbad0a182ed0574'), 'name': 'Alisa Parker', 'age': 72, 'phone': '768-319-1054', 'address': {'street': '8532 Ingalls Circle', 'city': 'Arvada', 'state': 'CO', 'postalCode': '80003'}}]  

Command: db.customer.find({}, { name: 1, phone: true}) | Result:  
[{'_id': ObjectId('65b84db62cbad0a182ed0573'), 'name': 'Izabella Conroy', 'phone': '108-679-2154'}, {'_id': ObjectId('65b84db62cbad0a182ed0574'), 'name': 'Alisa Parker', 'phone': '768-319-1054'}, {'_id': ObjectId('65b84db62cbad0a182ed0575'), 'name': 'Eloise Weber', 'phone': '618-357-2104'}]

Command: db.customer.find({}, { name: false, phone: 0}) | Result:  
[{'_id': ObjectId('65b84db62cbad0a182ed0573'), 'age': 19, 'address': {'street': '11 North Vineyard Drive', 'city': 'Pueblo West', 'state': 'CO', 'postalCode': '81007'}}, {'_id': ObjectId('65b84db62cbad0a182ed0574'), 'age': 72, 'address': {'street': '8532 Ingalls Circle', 'city': 'Arvada', 'state': 'CO', 'postalCode': '80003'}}, {'_id': ObjectId('65b84db62cbad0a182ed0575'), 'age': 29, 'address': {'street': '632 Belmar Drive', 'city': 'Edmond', 'state': 'OK', 'postalCode': '73025'}}]

Command: db.customer.find({}, {"address.city": 0, age: 0, "address.street": false}) | Result:  
[{'_id': ObjectId('65b84db62cbad0a182ed0573'), 'name': 'Izabella Conroy', 'phone': '108-679-2154', 'address': {'state': 'CO', 'postalCode': '81007'}}, {'_id': ObjectId('65b84db62cbad0a182ed0574'), 'name': 'Alisa Parker', 'phone': '768-319-1054', 'address': {'state': 'CO', 'postalCode': '80003'}}, {'_id': ObjectId('65b84db62cbad0a182ed0575'), 'name': 'Eloise Weber', 'phone': '618-357-2104', 'address': {'state': 'OK', 'postalCode': '73025'}}]

Command: db.customer.find().sort({age: 1}) | Result:  
[{'_id': ObjectId('65b84db62cbad0a182ed0573'), 'name': 'Izabella Conroy', 'age': 19, 'phone': '108-679-2154', 'address': {'street': '11 North Vineyard Drive', 'city': 'Pueblo West', 'state': 'CO', 'postalCode': '81007'}}, {'_id': ObjectId('65b84db62cbad0a182ed0575'), 'name': 'Eloise Weber', 'age': 29, 'phone': '618-357-2104', 'address': {'street': '632 Belmar Drive', 'city': 'Edmond', 'state': 'OK', 'postalCode': '73025'}}, {'_id': ObjectId('65b84db62cbad0a182ed0574'), 'name': 'Alisa Parker', 'age': 72, 'phone': '768-319-1054', 'address': {'street': '8532 Ingalls Circle', 'city': 'Arvada', 'state': 'CO', 'postalCode': '80003'}}]

Command: db.customer.find().sort({age: -1}) | Result:  
[{'_id': ObjectId('65b84db62cbad0a182ed0574'), 'name': 'Alisa Parker', 'age': 72, 'phone': '768-319-1054', 'address': {'street': '8532 Ingalls Circle', 'city': 'Arvada', 'state': 'CO', 'postalCode': '80003'}}, {'_id': ObjectId('65b84db62cbad0a182ed0575'), 'name': 'Eloise Weber', 'age': 29, 'phone': '618-357-2104', 'address': {'street': '632 Belmar Drive', 'city': 'Edmond', 'state': 'OK', 'postalCode': '73025'}}, {'_id': ObjectId('65b84db62cbad0a182ed0573'), 'name': 'Izabella Conroy', 'age': 19, 'phone': '108-679-2154', 'address': {'street': '11 North Vineyard Drive', 'city': 'Pueblo West', 'state': 'CO', 'postalCode': '81007'}}]

Command: db.customer.find().sort({age: 1}).limit(2) | Result:  
[{'_id': ObjectId('65b84db62cbad0a182ed0573'), 'name': 'Izabella Conroy', 'age': 19, 'phone': '108-679-2154', 'address': {'street': '11 North Vineyard Drive', 'city': 'Pueblo West', 'state': 'CO', 'postalCode': '81007'}}, {'_id': ObjectId('65b84db62cbad0a182ed0575'), 'name': 'Eloise Weber', 'age': 29, 'phone': '618-357-2104', 'address': {'street': '632 Belmar Drive', 'city': 'Edmond', 'state': 'OK', 'postalCode': '73025'}}]

Command: db.customer.find().sort({age: 1}).skip(2).limit(2) | Result:  
[{'_id': ObjectId('65b84db62cbad0a182ed0574'), 'name': 'Alisa Parker', 'age': 72, 'phone': '768-319-1054', 'address': {'street': '8532 Ingalls Circle', 'city': 'Arvada', 'state': 'CO', 'postalCode': '80003'}}]

NOTES

  • Use method “find” from redis-py.
  • Signature of the method is –
    def find(self, *args: Any, **kwargs: Any)
// db.collection.find() method example in Java

import com.mongodb.client.*;
import com.mongodb.client.model.Filters;
import com.mongodb.client.model.Sorts;
import org.bson.Document;

import java.util.Arrays;
import java.util.List;

public class Find {

    public static void main(String[] args) {
        String uri = "mongodb://bigboxuser:bigboxpass@localhost:27017/";

        try (MongoClient mongoClient = MongoClients.create(uri)) {
            MongoDatabase database = mongoClient.getDatabase("bigboxcode");
            MongoCollection<Document> customerCollection = database.getCollection("customer");

            // Insert some documents
            List<Document> documents = Arrays.asList(
                    new Document("name", "Izabella Conroy")
                            .append("age", 19)
                            .append("phone", "108-679-2154")
                            .append("address", new Document("street", "11 North Vineyard Drive")
                                    .append("city", "Pueblo West")
                                    .append("state", "CO")
                                    .append("postalCode", "81007")),
                    new Document("name", "Alisa Parker")
                            .append("age", 72)
                            .append("phone", "768-319-1054")
                            .append("address", new Document("street", "8532 Ingalls Circle")
                                    .append("city", "Arvada")
                                    .append("state", "CO")
                                    .append("postalCode", "80003")),
                    new Document("name", "Eloise Weber")
                            .append("age", 29)
                            .append("phone", "618-357-2104")
                            .append("address", new Document("street", "632 Belmar Drive")
                                    .append("city", "Edmond")
                                    .append("state", "OK")
                                    .append("postalCode", "73025"))
            );

            customerCollection.insertMany(documents);
            System.out.println("Command: db.customer.insertMany() | Result: " + documents);

            // Find all documents from the customer collection
            FindIterable<Document> findResults = customerCollection.find();

            System.out.println("Command: db.customer.find() | Result: ");
            MongoCursor<Document> findResultCursor = findResults.iterator();
            while (findResultCursor.hasNext()) {
                System.out.println(findResultCursor.next());
            }

            // Apply filter where age=29
            findResults = customerCollection.find(Filters.eq("age", 29));

            System.out.println("Command: db.customer.find() | Result: ");
            findResultCursor = findResults.iterator();
            while (findResultCursor.hasNext()) {
                System.out.println(findResultCursor.next());
            }

            // Apply filter where age >= 29
            findResults = customerCollection.find(Filters.gte("age", 29));

            System.out.println("Command: db.customer.find({age: {$gte: 29}}) | Result: ");
            findResultCursor = findResults.iterator();
            while (findResultCursor.hasNext()) {
                System.out.println(findResultCursor.next());
            }

            // Use $or operator for the query filter
            findResults = customerCollection.find(Filters.or(Filters.gt("age", 29), Filters.eq("address.postalCode", "81007")));

            System.out.println("Command: db.customer.find({$or: [{age: {$gt: 29}}, {"address.postalCode": "81007"}]}) | Result: ");
            findResultCursor = findResults.iterator();
            while (findResultCursor.hasNext()) {
                System.out.println(findResultCursor.next());
            }

            // Set projection to get name and phone only
            findResults = customerCollection.find()
                    .projection(new Document("name", 1).append("phone", true));

            System.out.println("Command: db.customer.find({}, { name: 1, phone: true}) | Result: ");
            findResultCursor = findResults.iterator();
            while (findResultCursor.hasNext()) {
                System.out.println(findResultCursor.next());
            }

            // Set projection to ignore name and phone fields
            findResults = customerCollection.find()
                    .projection(new Document("name", false).append("phone", 0));

            System.out.println("Command: db.customer.find({}, { name: false, phone: 0}) | Result: ");
            findResultCursor = findResults.iterator();
            while (findResultCursor.hasNext()) {
                System.out.println(findResultCursor.next());
            }

            // Ignore nested property inside address
            findResults = customerCollection.find()
                    .projection(new Document("address.city", 0).append("age", 0).append("address.street", false));

            System.out.println("Command: db.customer.find({}, {"address.city": 0, age: 0, "address.street": false}) | Result: ");
            findResultCursor = findResults.iterator();
            while (findResultCursor.hasNext()) {
                System.out.println(findResultCursor.next());
            }

            // Sort by age in ascending order
            findResults = customerCollection.find().sort(Sorts.ascending("age"));

            System.out.println("Command: db.customer.find().sort({age: 1}) | Result: ");
            findResultCursor = findResults.iterator();
            while (findResultCursor.hasNext()) {
                System.out.println(findResultCursor.next());
            }

            // Sort by age in descending order
            findResults = customerCollection.find().sort(Sorts.descending("age"));

            System.out.println("Command: db.customer.find().sort({age: -1}) | Result: ");
            findResultCursor = findResults.iterator();
            while (findResultCursor.hasNext()) {
                System.out.println(findResultCursor.next());
            }

            // Apply limit
            findResults = customerCollection.find().sort(Sorts.ascending("age")).limit(2);

            System.out.println("Command: db.customer.find().sort({age: 1}).limit(2) | Result: ");
            findResultCursor = findResults.iterator();
            while (findResultCursor.hasNext()) {
                System.out.println(findResultCursor.next());
            }

            // Skip certain results
            findResults = customerCollection.find().sort(Sorts.ascending("age")).skip(2).limit(2);

            System.out.println("Command: db.customer.find().sort({age: 1}).skip(2).limit(2) | Result: ");
            findResultCursor = findResults.iterator();
            while (findResultCursor.hasNext()) {
                System.out.println(findResultCursor.next());
            }
        }
    }
}

Output:

Command: db.customer.insertMany() | Result: 
[Document{{name=Izabella Conroy, age=19, phone=108-679-2154, address=Document{{street=11 North Vineyard Drive, city=Pueblo West, state=CO, postalCode=81007}}, _id=65b8552c8d62d775440a0476}}, Document{{name=Alisa Parker, age=72, phone=768-319-1054, address=Document{{street=8532 Ingalls Circle, city=Arvada, state=CO, postalCode=80003}}, _id=65b8552c8d62d775440a0477}}, Document{{name=Eloise Weber, age=29, phone=618-357-2104, address=Document{{street=632 Belmar Drive, city=Edmond, state=OK, postalCode=73025}}, _id=65b8552c8d62d775440a0478}}]

Command: db.customer.find() | Result: 
Document{{_id=65b8552c8d62d775440a0476, name=Izabella Conroy, age=19, phone=108-679-2154, address=Document{{street=11 North Vineyard Drive, city=Pueblo West, state=CO, postalCode=81007}}}}
Document{{_id=65b8552c8d62d775440a0477, name=Alisa Parker, age=72, phone=768-319-1054, address=Document{{street=8532 Ingalls Circle, city=Arvada, state=CO, postalCode=80003}}}}
Document{{_id=65b8552c8d62d775440a0478, name=Eloise Weber, age=29, phone=618-357-2104, address=Document{{street=632 Belmar Drive, city=Edmond, state=OK, postalCode=73025}}}}

Command: db.customer.find() | Result: 
Document{{_id=65b8552c8d62d775440a0478, name=Eloise Weber, age=29, phone=618-357-2104, address=Document{{street=632 Belmar Drive, city=Edmond, state=OK, postalCode=73025}}}}
Command: db.customer.find({age: {$gte: 29}}) | Result: 
Document{{_id=65b8552c8d62d775440a0477, name=Alisa Parker, age=72, phone=768-319-1054, address=Document{{street=8532 Ingalls Circle, city=Arvada, state=CO, postalCode=80003}}}}
Document{{_id=65b8552c8d62d775440a0478, name=Eloise Weber, age=29, phone=618-357-2104, address=Document{{street=632 Belmar Drive, city=Edmond, state=OK, postalCode=73025}}}}

Command: db.customer.find({$or: [{age: {$gt: 29}}, {"address.postalCode": "81007"}]}) | Result: 
Document{{_id=65b8552c8d62d775440a0476, name=Izabella Conroy, age=19, phone=108-679-2154, address=Document{{street=11 North Vineyard Drive, city=Pueblo West, state=CO, postalCode=81007}}}}
Document{{_id=65b8552c8d62d775440a0477, name=Alisa Parker, age=72, phone=768-319-1054, address=Document{{street=8532 Ingalls Circle, city=Arvada, state=CO, postalCode=80003}}}}

Command: db.customer.find({}, { name: 1, phone: true}) | Result: 
Document{{_id=65b8552c8d62d775440a0476, name=Izabella Conroy, phone=108-679-2154}}
Document{{_id=65b8552c8d62d775440a0477, name=Alisa Parker, phone=768-319-1054}}
Document{{_id=65b8552c8d62d775440a0478, name=Eloise Weber, phone=618-357-2104}}

Command: db.customer.find({}, { name: false, phone: 0}) | Result: 
Document{{_id=65b8552c8d62d775440a0476, age=19, address=Document{{street=11 North Vineyard Drive, city=Pueblo West, state=CO, postalCode=81007}}}}
Document{{_id=65b8552c8d62d775440a0477, age=72, address=Document{{street=8532 Ingalls Circle, city=Arvada, state=CO, postalCode=80003}}}}
Document{{_id=65b8552c8d62d775440a0478, age=29, address=Document{{street=632 Belmar Drive, city=Edmond, state=OK, postalCode=73025}}}}

Command: db.customer.find({}, {"address.city": 0, age: 0, "address.street": false}) | Result: 
Document{{_id=65b8552c8d62d775440a0476, name=Izabella Conroy, phone=108-679-2154, address=Document{{state=CO, postalCode=81007}}}}
Document{{_id=65b8552c8d62d775440a0477, name=Alisa Parker, phone=768-319-1054, address=Document{{state=CO, postalCode=80003}}}}
Document{{_id=65b8552c8d62d775440a0478, name=Eloise Weber, phone=618-357-2104, address=Document{{state=OK, postalCode=73025}}}}

Command: db.customer.find().sort({age: 1}) | Result: 
Document{{_id=65b8552c8d62d775440a0476, name=Izabella Conroy, age=19, phone=108-679-2154, address=Document{{street=11 North Vineyard Drive, city=Pueblo West, state=CO, postalCode=81007}}}}
Document{{_id=65b8552c8d62d775440a0478, name=Eloise Weber, age=29, phone=618-357-2104, address=Document{{street=632 Belmar Drive, city=Edmond, state=OK, postalCode=73025}}}}
Document{{_id=65b8552c8d62d775440a0477, name=Alisa Parker, age=72, phone=768-319-1054, address=Document{{street=8532 Ingalls Circle, city=Arvada, state=CO, postalCode=80003}}}}

Command: db.customer.find().sort({age: -1}) | Result: 
Document{{_id=65b8552c8d62d775440a0477, name=Alisa Parker, age=72, phone=768-319-1054, address=Document{{street=8532 Ingalls Circle, city=Arvada, state=CO, postalCode=80003}}}}
Document{{_id=65b8552c8d62d775440a0478, name=Eloise Weber, age=29, phone=618-357-2104, address=Document{{street=632 Belmar Drive, city=Edmond, state=OK, postalCode=73025}}}}
Document{{_id=65b8552c8d62d775440a0476, name=Izabella Conroy, age=19, phone=108-679-2154, address=Document{{street=11 North Vineyard Drive, city=Pueblo West, state=CO, postalCode=81007}}}}

Command: db.customer.find().sort({age: 1}).limit(2) | Result: 
Document{{_id=65b8552c8d62d775440a0476, name=Izabella Conroy, age=19, phone=108-679-2154, address=Document{{street=11 North Vineyard Drive, city=Pueblo West, state=CO, postalCode=81007}}}}
Document{{_id=65b8552c8d62d775440a0478, name=Eloise Weber, age=29, phone=618-357-2104, address=Document{{street=632 Belmar Drive, city=Edmond, state=OK, postalCode=73025}}}}

Command: db.customer.find().sort({age: 1}).skip(2).limit(2) | Result: 
Document{{_id=65b8552c8d62d775440a0477, name=Alisa Parker, age=72, phone=768-319-1054, address=Document{{street=8532 Ingalls Circle, city=Arvada, state=CO, postalCode=80003}}}}

NOTES

  • Use the method “find()” from MongoCollection.
  • Signatures of the method are-
    • FindIterable<TDocument> find()
    • FindIterable<TDocument> find(Bson filter)
    • FindIterable<TDocument> find(ClientSession clientSession)
    • FindIterable<TDocument> find(ClientSession clientSession, Bson filter)

Source Code

Use the following links to get the source code used in this article-

Source Code ofSource Code Link
Command Examples GitHub
NodeJS Implementation GitHub
Python Implementation GitHub
Golang Implementation GitHub
Java Implementation GitHub

Related Methods

CommandDetails
db.collection.findOne() Method Details
db.collection.findAndModify() Method Details
db.collection.findOneAndUpdate() Method Details
db.collection.findOneAndReplace() Method Details
db.collection.findOneAndDelete() Method Details
db.collection.distinct() Method Details
db.collection.count() Method Details
db.collection.countDocuments() Method Details

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