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MongoDB query to update a specific document from a collection
To update, use $set along with UPDATE. Let us create a collection with documents −
>db.demo135.insertOne({"Details":[{"EmployeeId":101,"EmployeeName":"Chris","EmployeeSalary":45000},{"EmployeeId":102,"EmployeeName":"Chris","EmployeeSalary":45000}]});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e31a5ddfdf09dd6d085399c")
}Display all documents from a collection with the help of find() method −
> db.demo135.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5e31a5ddfdf09dd6d085399c"),
"Details" : [
{
"EmployeeId" : 101,
"EmployeeName" : "Chris",
"EmployeeSalary" : 45000
},
{
"EmployeeId" : 102,
"EmployeeName" : "Chris",
"EmployeeSalary" : 45000
}
]
}Following is the query to update second document −
> db.demo135.update(
... {
...
... "Details.EmployeeId":102,
...
... },
... {
... $set: {
... "Details.$.EmployeeName" : "John Doe"
... }
... }
... );
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })Display all documents from a collection with the help of find() method −
> db.demo135.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5e31a5ddfdf09dd6d085399c"),
"Details" : [
{
"EmployeeId" : 101,
"EmployeeName" : "Chris",
"EmployeeSalary" : 45000
},
{
"EmployeeId" : 102,
"EmployeeName" : "John Doe",
"EmployeeSalary" : 45000
}
]
}
Updated on: 31-Mar-2020
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