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How to insert new documents into a MongoDB collection in your database?
To insert new documents into a MongoDB collection, you need to use insert() method or save() method.
Case 1: Using insert() method.
The syntax is as follows:
db.yourCollectionName.insert(yourDocument);
Case 2: Using save() method.
The syntax is as follows:
db.yourCollectionName.save(yourDocument);
In the above syntax, if your collection name does not exist then MongoDB will create a new collection and insert the document in the collection.
The query to insert new documents is as follows for both the cases discussed above.
Case 1: Using insert() method. The query is as follows:
> db.userInformation.insert({
... "Name":"John",
... Age:30,
... isStudent:false,
... "Subjects":["Introduction to java","Introduction to MongoDB"]
...
});The following is the output:
WriteResult({ "nInserted" : 1 })Above, I already had a collection name ‘userInformation’. In this case MongoDB will not create any collection name since it already exist.
Case 2: The following is the query to insert documents with the help of save():
> db.employee.save({"EmployeeName":"Larry",Salary:180000,Age:25,
... "Address":({"CountryName":"US","CityName":"New York"})
... });The following is the output:
WriteResult({ "nInserted" : 1 })In the above query, we do not have a collection name ‘employee’. Therefore, MongoDB will create a collection with the name ‘employee’ and insert documents in the newly created collection.
To display all collection names now, use the show command. The query is as follows:
> show collections;
The following is the output:
employee userInformation
Yes, we have employee collection now, even if we did not created it using createCollection(). MongoDB has created a ‘employee’ collection for us as we saw above.
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