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1. MongoDB Basic Shell Program’s
CRUD
Operations for
MongoDB

2. Start the Shell
• C:mongodb-win32-x86_64-
2.2.3bin>mongo.exe
MongoDB shell version: 2.2.3
connecting to: test

3. Create Document the insert()
> register={"uName":"anish",
... "date":new Date()}
{ "uName" : "anish", "date" : ISODate("2013-03-10T10:08:30.891Z") }
> db.user.insert(register)
> db.user.find()
{ "_id" : ObjectId("513c581f1b37fce6f69eb9e0"), "fname" :
"anish", "date" : ISODate("2013-03-10T09:52:53.144Z") }
{ "_id" : ObjectId("513c5be21b37fce6f69eb9e2"), "uName" :
"anish", "date" : ISODate("2013-03-10T10:08:30.891Z") }
The “_id” field If you attempt to insert a document without
the _id field, the client library or the mongod instance will add
an _id field and populate the field with a unique ObjectId.

4. Create Document the insert() with
own “_id” key
> register =
{"_id":100,"uName":"arjun","date":new Date()}
{
"_id" : 100,
"uName" : "arjun",
"date" : ISODate("2013-03-12T14:41:15.124Z")
}
>db.user.insert(register)
> db.user.find({"uName":"arjun"})
{ "_id" : 100, "uName" : "arjun", "date" :
ISODate("2013-03-12T14:41:15.124Z") }

5. Create Document the insert() same “_id” key
will throw E11000 duplicate key error
> register =
{"_id":100,"uName":"arjun","date":new Date()}
{
"_id" : 100,
"uName" : "arjun",
"date" : ISODate("2013-03-12T14:44:14.163Z")
}
> db.user.insert(register)
E11000 duplicate key error index: test.user.$_id_
dup key: { : 100.0 }

6. MongoDB Reading/finding
Document
Reading/finding Document Use Case
detailed

7. Reading/finding in Document
Syntax
db.collection.find( <query>,
<projection> )
<query> argument corresponds to
the WHERE statement, and
<projection> argument corresponds
to the list of fields to select from the
result set.

8. Reading Document
> db.user.findOne()
{
"_id" : ObjectId("513c581f1b37fce6f69eb9e0"),
"fname" : "anish",
"date" : ISODate("2013-03-10T09:52:53.144Z")
}
> db.user.find()
{ "_id" : ObjectId("513c581f1b37fce6f69eb9e0"), "fname"
: "anish", "date" : ISODate("2013-03-10T09:52:53.144Z") }
{ "_id" : ObjectId("513c5be21b37fce6f69eb9e2"),
"uName" : "anish", "date" : ISODate("2013-03-
10T10:08:30.891Z") }
Refer more use case on find() on the Other video

9. findOne()
Find the first record in the document
> db.user.findOne()
{
"_id" : ObjectId("513c6ef1cfce9090d3fd8b1d"),
"date" : ISODate("2013-03-10T11:30:50.555Z"),
"remarks" : [
{
"name" : "anish",
"rate" : "good"
},
{
"name" : "nath",
"rate" : "bad"
}
],
"uName" : "anish"
}

10. findOne() : specify which key to return
• Find the first record in the document and return only “_id”
> db.user.findOne({},{"_id":1})
{ "_id" : ObjectId("513c6ef1cfce9090d3fd8b1d") }
• Find the first record in the document and return only
“_id” and date
> db.user.findOne({},{"_id":1,"date":1})
{
"_id" : ObjectId("513c6ef1cfce9090d3fd8b1d"),
"date" : ISODate("2013-03-10T11:30:50.555Z")
}
• Find the first record in the document and return all the
data except the “_id” field
> db.user.findOne({},{"_id":0})
{
"date" : ISODate("2013-03-10T11:30:50.555Z"),
"remarks" : [
{
"name" : "anish",
"rate" : "good"
},
{
"name" : "nath",
"rate" : "bad"
}
],
"uName" : "anish"
}

11. finding in Subdocument
>db.user.find(
{"remarks.name":"anish" })
{ "_id" :
ObjectId("513c6ef1cfce9090d3fd8b1d"),
"date" : ISODate("2013-03-
10T11:30:50.555Z"), "remarks" : [ {
"name
" : "anish", "rate" : "good" }, {
"name" : "nath", "rate" : "bad" } ],
"uName" : "anish" }

12. findOne()/find()
• Summary on <K,boolean>
specify <“k”,0> or <“K”,1>
to show/hide data to be
returned from the
collection

13. MongoDB updating Document
Updating Document Use Case
detailed

14. Updating Document <K,V>
> db.user.find()
{ "_id" : ObjectId("513c6ef1cfce9090d3fd8b1d"), "uName" : "nath", "date" :
ISODate("2013-03-10T11:30:50.555Z") }
Update the uName with “anish”
Step 1 find userName with “nath”
> var test=db.user.findOne({"uName":"nath"})
Step 2
> test.uName="anish"
anish
Step 3
>db.user.update({"uName":"nath"},test)
> db.user.findOne()
{ "_id" : ObjectId("513c6ef1cfce9090d3fd8b1d"),
"uName" : "anish", "date" : ISODate("2013-03-
10T11:30:50.555Z") }

15. Updating Document
Syntax : db.collection.update( <query>,<update>,
<options> )
> db.user.find()
{ "_id" : ObjectId("513c60deb2080f893286d0a3"), "uName" : "anish", "date" : ISODate("2013-03-
10T10:30:47.033Z") }
{ "_id" : ObjectId("513c60fab2080f893286d0a4"), "lName" : "anish", "date" : ISODate("2013-03-
10T10:31:18.632Z") }
> register.uName={"uName" : "nath"}
{ "uName" : "nath" }
> db.user.update({"uName":"anish"},register)
> db.user.find()
{ "_id" : ObjectId("513c60fab2080f893286d0a4"), "lName" : "anish", "date" : ISODate("2013-03-
10T10:31:18.632Z") }
{ "_id" : ObjectId("513c60deb2080f893286d0a3"), "lName" : "anish", "date" : ISODate("2013-03-
10T10:31:18.632Z"), "uName" : {
"uName" : "nath" } }

16. Updating Document adding a new <k,V> to the document
> db.user.findOne()
{
"_id" : ObjectId("513c6ef1cfce9090d3fd8b1d"),
"uName" : "nath",
"date" : ISODate("2013-03-10T11:30:50.555Z")
}
Add a age in the document i.e
{
"_id" : ObjectId("513c6ef1cfce9090d3fd8b1d"),
"uName" : "anish",
"date" : ISODate("2013-03-10T11:30:50.555Z"),
"age" : 32
}
Step 1 : findById
var findById=db.user.findOne({"_id" : ObjectId("513c6ef1cfce9090d3fd8b1d")})
Step2 : add age to the document
> findById.age=32
32
Step 3 Update the Document
> db.user.update({"_id" : ObjectId("513c6ef1cfce9090d3fd8b1d")},findById)
> db.user.findOne()
{
"_id" : ObjectId("513c6ef1cfce9090d3fd8b1d"),
"uName" : "anish",
"date" : ISODate("2013-03-10T11:30:50.555Z"),
"age" : 32
}

17. Updating Document :Add a new Structure in the existing Document
> db.user.findOne()
{
"_id" : ObjectId("513c6ef1cfce9090d3fd8b1d"),
"uName" : "anish",
"date" : ISODate("2013-03-10T11:30:50.555Z"),
"age" : 32
}
Change the Document to the following
{
"_id" : ObjectId("513c6ef1cfce9090d3fd8b1d"),
"uName" : "anish",
"date" : ISODate("2013-03-10T11:30:50.555Z"),
"age" : 32,
"family" : {
"motherName" : "Indu",
"wifeName" : "manisha",
"fatherName" : "Anil"
}
}

18. Updating Document :Add a new Structure in the existing Document
Step 1 : findUserById
>var findById=db.user.findOne({"_id" : ObjectId("513c6ef1cfce9090d3fd8b1d")})
Step 2: Add a family JSON entry
>findById.family={"motherName":"Indu","wifeName":"manisha","fatherName":"A
nil"}
{ "motherName" : "Indu", "wifeName" : "manisha", "fatherName" : "Anil" }
Step 3 : Update the docuemt :
> db.user.update({"_id" : ObjectId("513c6ef1cfce9090d3fd8b1d")},findById)
Step 4 : Search the User DB
> db.user.findOne()
{
"_id" : ObjectId("513c6ef1cfce9090d3fd8b1d"),
"uName" : "anish",
"date" : ISODate("2013-03-10T11:30:50.555Z"),
"age" : 32,
"family" : {
"motherName" : "Indu",
"wifeName" : "manisha",
"fatherName" : "Anil"
}
}

19. Deleting Document
> db.user.find()
{ "_id" : ObjectId("513c60fab2080f893286d0a4"), "lName" : "anish", "date" : ISODate("2013-03-
10T10:31:18.632Z") }
{ "_id" : ObjectId("513c60deb2080f893286d0a3"), "lName" : "anish", "date" : ISODate("2013-03-
10T10:31:18.632Z"), "uName" : {
"uName" : "nath" } }
>
db.user.remove({"_id":ObjectId("513c60fab2080f893286d0a4")}
)
> db.user.find()
{ "_id" : ObjectId("513c60deb2080f893286d0a3"), "lName" : "anish", "date" : ISODate("2013-03-
10T10:31:18.632Z"), "uName" : {
"uName" : "nath" } }
>db.user.remove() : deletes documents
permanently from the database

20. Thanks for Watching
feedback
appreciated………………
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