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MongoDB query to access an object in an array
To access an object in an array, use dot notation. Let us create a collection with documents −
> db.demo299.insertOne(
... {
... "id":100,
... "Name":"Robert",
... "details":[
... {
... "SubjectName":["C++","Python"]
... },
... {
... "SubjectName":["Spring","Hibernate"]
... }
... ]
... }
...);
{
"acknowledged" : true,
"insertedId" : ObjectId("5e4d685a5d93261e4bc9ea4b")
}
>
>
> db.demo299.insertOne(
... {
... "id":101,
... "Name":"Adam",
... "details":[
... {
... "SubjectName":["Python","JSP"]
... },
... {
... "SubjectName":["Servlet","Operating System"]
... }
... ]
... }
...);
{
"acknowledged" : true,
"insertedId" : ObjectId("5e4d685b5d93261e4bc9ea4c")
}
Display all documents from a collection with the help of find() method −
> db.demo299.find();
This will produce the following output −
{
"_id" : ObjectId("5e4d685a5d93261e4bc9ea4b"), "id" : 100, "Name" : "Robert", "details" : [
{ "SubjectName" : [ "C++", "Python" ] },
{ "SubjectName" : [ "Spring", "Hibernate" ] }
]
}
{
"_id" : ObjectId("5e4d685b5d93261e4bc9ea4c"), "id" : 101, "Name" : "Adam", "details" : [
{ "SubjectName" : [ "Python", "JSP" ] }, { "SubjectName" : [ "Servlet", "Operating System" ] }
]
}
Following is the query to access an object in an array −
> db.demo299.find({"details.SubjectName":"Servlet"});
This will produce the following output −
{
"_id" : ObjectId("5e4d685b5d93261e4bc9ea4c"), "id" : 101, "Name" : "Adam", "details" : [
{ "SubjectName" : [ "Python", "JSP" ] }, { "SubjectName" : [ "Servlet", "Operating System" ] }
]
}
Updated on: 2020-04-01T07:23:32+05:30
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