Inserting Documents in MongoDB

• Inserting a single document in the collection.

test> use students;
switched to db students
students> db.data.insertOne({'name': 'Prabin', age: 22});
{
  acknowledged: true,
  insertedId: ObjectId("64fabf5c7d6e92e1e0d959f7")
}

• Inserting multiple documents in the collection

students> db.data.insertMany([{'name': 'Ashok', age:23 }, {'name': 'Shubham', age: 24}])
{
  acknowledged: true,
  insertedIds: {
    '0': ObjectId("64fabff57d6e92e1e0d959f8"),
    '1': ObjectId("64fabff57d6e92e1e0d959f9")
  }
}

• List all the documents which has been created.

students> db.data.find()
[
  {
    _id: ObjectId("64fabf5c7d6e92e1e0d959f7"),
    name: 'Prabin',
    age: 22
  },
  { _id: ObjectId("64fabff57d6e92e1e0d959f8"), name: 'Ashok', age: 23 },
  {
    _id: ObjectId("64fabff57d6e92e1e0d959f9"),
    name: 'Shubham',
    age: 24
  }
]

When to use quotes and when not to ?

• If the field name contains the special characters or spaces, or starts with a numberic digit, using quotes is necessary.
• If the field name is a reserved keyword in MongoDB, use quotes to distinguish it from the reserved keyword.

Ordered and Unordered Inserts

When executing bulk write operations, 'ordered' and 'unordered' determine the batch behaviour.

• Ordered inserts: Default behaviour is ordered inserts, where MongoDB can stops on first order.
• Unordered inserts: When executing bulk write operations with unordered flag, MongoDB can do processing after encountering an error.

students> db.data.insertMany([{'name': 'Rahul', age:23 }, {'name': 'Abhishek', age: 24}], {"ordered": false});
{
  acknowledged: true,
  insertedIds: {
    '0': ObjectId("64fac3ed7d6e92e1e0d959fa"),
    '1': ObjectId("64fac3ed7d6e92e1e0d959fb")
  }
}

Case Sensitivity in MongoDB

• Collection Name are case sensitive.
• Field names in the document is also case sensitive.