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

2. 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.

3. 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"
}

4. 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"
}

5. 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" }

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

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