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https://github.com/chaudhuree/mongodb
https://github.com/chaudhuree/mongodb
Last synced: 4 days ago
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- Host: GitHub
- URL: https://github.com/chaudhuree/mongodb
- Owner: chaudhuree
- Created: 2022-11-17T10:42:01.000Z (about 2 years ago)
- Default Branch: master
- Last Pushed: 2023-11-28T21:17:52.000Z (12 months ago)
- Last Synced: 2023-11-28T22:28:05.821Z (12 months ago)
- Language: JavaScript
- Size: 145 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
# **MongoDB Sheet**
## Show All Databases
```
show dbs
```
## Exit the mongosh session
```
exit
```
## Show Current Database
```
db
```
## Create Or Switch Database
**use **
```
example: use users
```
## Drop
```
db.dropDatabase()
```
## Create Collection
```
db.createCollection('users')
```
## Show Collections
```
show collections
```
## insertOne
```
db.users.insertOne({ name: “mamun” })
```
## main data for the database
```
db.users.insertMany([{
name: "sohan"
},
{
name: "chaudhuree",
age: 19,
address:{street:"uttara sector 4"},
hobbies:["Running"]
},
{name:"kabir"},
{name:"shahriar"},
{
name:"jeshan",
age:26,
hobbies:["Weight Lifting","Bowling"],
address:{street:"balighata bazar",city: "joypurhat panchbibi"}
},
{
name:"habib",
age:41,
hobbies:["Swimming","Bowling"],
address:{street:"savar 435",city: "savar dhaka"}
},
{
name: "rakib",
age: null
},
{
name:"dipto",
cashIn:100,
cashOut:200
},
{
name:"gourab",
cashIn:500,
cashOut:800
}
])
```
## Get all documents
```
db.users.find()
```
## Find all documents that match the filter object
> **Get all users** with the name sohan
```
db.users.find({ name: “sohan” })
```
> in order to search from **object**
db.users.find({"object element in quatation":"search string"})
**example:**
db.users.find({ “address.street”: “balighata bazar” })
## in order to search in array follow the link below
> **[find in an array](https://www.mongodb.com/docs/manual/reference/operator/query/elemMatch/)**
## Find all documents but only return the field specified in the select object
> Get all users with the name chaudhuree but only return their name, age, and \_id
db.users.find({ name: “chaudhuree” }, { name: 1, age: 1 })
> Get all users and return all columns except for age
db.users.find({}, { age: 0 })
## findOne
> Get the first user with the name chaudhuree
db.users.findOne({ name: “chaudhuree” })
## countDocuments
> Get the number of users with the name chaudhuree
db.users.countDocuments({ name: “chaudhuree” })
# **Update**
## updateOne
> Update the first user with an age of 20 to the age of 21
db.users.updateOne({ age: 20 }, { $set: { age: 21 } })
> Update the first user with adding the new value of notes
db.users.updateOne({ age: 20 }, { $set: { notes: "work hard" } })
## updateMany
> Update all users with an age of 12 by adding 3 to their age
db.users.updateMany({ age: 12 }, { $inc: { age: 3 } })
## replaceOne
Replace the first document that matches the filter object
with the exact object passed as the second parameter. This
will **completely overwrite** the entire object and not just
update individual fields.
> Replace the first user with an age of 12 with an object that has the age of 13 as its only field
db.users.replaceOne({ age: 12 }, { age: 13 })
## **_Difference between replace and update_**
With replaceOne() you can only replace the entire document, while updateOne() allows for updating fields.
Since replaceOne() replaces the entire document - fields in the old document not contained in the new will be lost. With updateOne() new fields can be added without losing the fields in the old document.
> example:
db.users.insertOne({my_test_key3 : 3333})
using replace one:
db.users.replaceOne({my_test_key3 : 3333},{ my_test_key4 : 4444})
results in:
{ "_id" : ObjectId("0123456789abcdef01234567"),
my_test_key4 : 4444 }
using updateOne:
updateOne( {my_test_key3 : 3333} ,
{ $set:{my_test_key4 : 4444}} )
results in:
{ "_id" : ObjectId("0123456789abcdef01234567"),
my_test_key3 : 3333,
my_test_key : 4444
}
# **Delete**
## deleteOne
> Delete the first user with an age of 20
db.users.deleteOne({ age: 20 })
## deleteMany
> Delete all users with an age of 12
db.users.deleteMany({ age: 12 })
# **Read Modifiers**
## sort
> Get all users sorted by name in alphabetical order and then if any names are the same sort by age in reverse order
db.users.find().sort({ name: 1, age: -1 })
## limit
> Only return the first 2 users
db.users.find().limit(2)
## skip
> Skip the first 4 users when returning results. This is great for pagination when combined with limit.
db.users.find().skip(4)
# **Complex Filter Object**
## $eq
> Get all users with the name chaudhuree
db.users.find({ name: { $eq: “chaudhuree” } })
## $ne
> Get all users with a name other than Kyle
db.users.find({ name: { $ne: “chaudhuree” } })
## $gt / $gte
> Get all users with an age greater than 12
db.users.find({ age: { $gt: 12 } })
> Get all users with an age greater than or equal to 15
db.users.find({ age: { $gte: 15 } })
## $lt / $lte
> Get all users with an age less than 12
db.users.find({ age: { $lt: 12 } })
> Get all users with an age less than or equal to 15
db.users.find({ age: { $lte: 15 } })
## $in
> Get all users with a name of chaudhuree or sohan
db.users.find({ name: { $in: [“chaudhuree”, “sohan”] } })
## $nin
> Get all users that do not have the name chaudhuree or sohan
db.users.find({ name: { $nin: [“chaudhuree”, “sohan”] } })
## $and
> Get all users that have an age of 12 and the name chaudhuree
db.users.find({ $and: [{ age: 12 }, { name: “Kyle” }] })
> This is an alternative way to do the same thing. Generally you do not need $and.
db.users.find({ age: 12, name: “Kyle” })
## $or
> Get all users with a name of chaudhuree or an age of 12
db.users.find({ $or: [{ age: 12 }, { name: “chaudhuree” }] })
## $not
> Get all users with a name other than chaudhuree
db.users.find({ name: { $not: { $eq: “chaudhuree” } } })
## $exists
> Get all users that have a name field
db.users.find({ name: { $exists: true } })
## $expr
**_Do comparisons between different fields_**
> Get all users that have a cashIn that is greater than their cashOut
db.users.find({ $expr: { $gt: [“$cashIn”, “$cashOut”] } })
> ** note: infront of cashIn and cashOut we have to use **$\*\* sign
# **Complex Update Object**
Any combination of the below can be use inside an update object to make complex updates
## $set
> Update the name of the first user with the age of 12 to the value Hi
db.users.updateOne({ age: 12 }, { $set: { name: “Hi” } })
## $inc
> Add 2 to the age of the first user with the age of 12
db.users.updateOne({ age: 12 }, { $inc: { age: 2 } })
## $rename
> Rename the field age to years for all users
db.users.updateMany({}, { $rename: { age: “years” } })
## $unset
> Remove the age field from the first user with an age of 12
db.users.updateOne({ age: 12 }, { $unset: { age: “” } })
## $push
> Add John to the friends array for all users
db.users.updateMany({}, { $push: { friends: “annie” } })
## $pull
> Remove Mike from the friends array for all users
db.users.updateMany({}, { $pull: { friends: “annie” } })
## **change type of perameter from one to another (example: string to int)**
> command to convert all the string type data in MongoDB to int:
```
db.getCollection("products").find({"Price":{"$exists":true,"$type":2}}).forEach(function(doc){
let newPrice = parseInt(doc.Price)
db.getCollection("products").updateOne({"_id":doc._id},{"$set":{"Price":newPrice}})
})
```
> JSON data :
```
[
{
_id: {
$oid: "629b1c0d43c8ce4c371913c7"
},
CategoryID: 1654327845,
BrandID: 1652474116,
Name: "560 ltr Refrigerator",
Price: "100000",
Unit: "lt",
Details: "Refrigerator",
CreatedDate: {
$date: "2022-06-04T07:21:51.032Z"
},
ProductID: 1654332429
},
{
_id: {
$oid: "629b1c3c43c8ce4c371913c9"
},
CategoryID: 1654327845,
BrandID: 1654327435,
Name: "510 ltr Refrigerator",
Price: "75000",
Unit: "lt",
Details: "Refrigerator",
CreatedDate: {
$date: "2022-06-04T07:21:51.032Z"
},
ProductID: 1654332476
},
{
_id: {
$oid: "629b1c5343c8ce4c371913cb"
},
CategoryID: 1654327845,
BrandID: 1654327447,
Name: "410 ltr Refrigerator",
Price: "35000",
Unit: "lt",
Details: "Refrigerator",
CreatedDate: {
$date: "2022-06-04T07:21:51.032Z"
},
ProductID: 1654332499
},
{
_id: {
$oid: "629b1cbd43c8ce4c371913cd"
},
CategoryID: 1652474957,
BrandID: 1652474116,
Name: "32' TV",
Price: "35000",
Unit: "inch",
Details: "LED TV",
CreatedDate: {
$date: "2022-06-04T07:21:51.032Z"
},
ProductID: 1654332605
},
{
_id: {
$oid: "629b1cd143c8ce4c371913cf"
},
CategoryID: 1652474957,
BrandID: 1654327435,
Name: "42' TV",
Price: "56000",
Unit: "inch",
Details: "LED TV",
CreatedDate: {
$date: "2022-06-04T07:21:51.032Z"
},
ProductID: 1654332625
},
{
_id: {
$oid: "629b1cd843c8ce4c371913d1"
},
CategoryID: 1652474957,
BrandID: 1654327435,
Name: "32' TV",
Price: "34000",
Unit: "inch",
Details: "LED TV",
CreatedDate: {
$date: "2022-06-04T07:21:51.032Z"
},
ProductID: 1654332632
},
{
_id: {
$oid: "629b1ce443c8ce4c371913d3"
},
CategoryID: 1652474957,
BrandID: 1654327441,
Name: "32' TV",
Price: "33000",
Unit: "inch",
Details: "LED TV",
CreatedDate: {
$date: "2022-06-04T07:21:51.032Z"
},
ProductID: 1654332644
},
{
_id: {
$oid: "629b1cf643c8ce4c371913d5"
},
CategoryID: 1652474957,
BrandID: 1654327447,
Name: "32' TV",
Price: "32000",
Unit: "inch",
Details: "LED TV",
CreatedDate: {
$date: "2022-06-04T07:21:51.032Z"
},
ProductID: 1654332662
},
{
_id: {
$oid: "629b1d0143c8ce4c371913d7"
},
CategoryID: 1652474957,
BrandID: 1654327447,
Name: "42' TV",
Price: "64000",
Unit: "inch",
Details: "LED TV",
CreatedDate: {
$date: "2022-06-04T07:21:51.032Z"
},
ProductID: 1654332673
}
]
```