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Insert a Document

You can insert a single document into a collection using the insertOne() method on a MongoCollection object. To insert a document, construct a Document object that contains the fields and values that you want to store. If you call the insertOne() method on a collection that does not exist yet, the server automatically creates it for you.

Upon a successful insertion, insertOne() returns an instance of InsertOneResult. You can retrieve information such as the _id field of the document you inserted by calling the getInsertedId() method on the InsertOneResult instance.

If your insert operation fails, the driver raises an exception. For more information on the types of exceptions raised under specific conditions, see the API documentation for insertOne(), linked at the bottom of this page.

The following snippet inserts a single document into the movies collection.

When you run the example, you should see output with the inserted document's ObjectId in the value field:


This example connects to an instance of MongoDB using a connection URI. To learn more about connecting to your MongoDB instance, see the connection guide.

import com.mongodb.MongoException
import com.mongodb.kotlin.client.coroutine.MongoClient
import kotlinx.coroutines.runBlocking
import org.bson.codecs.pojo.annotations.BsonId
import org.bson.types.ObjectId
data class Movie(@BsonId val id: ObjectId, val title: String, val genres: List<String>)
fun main() = runBlocking {
// Replace the uri string with your MongoDB deployment's connection string
val uri = "<connection string uri>"
val mongoClient = MongoClient.create(uri)
val database = mongoClient.getDatabase("sample_mflix")
val collection = database.getCollection<Movie>("movies")
try {
val result = collection.insertOne(
Movie(ObjectId(), "Ski Bloopers", listOf("Documentary", "Comedy"))
println("Success! Inserted document id: " + result.insertedId)
} catch (e: MongoException) {
System.err.println("Unable to insert due to an error: $e")

For additional information on the classes and methods mentioned on this page, see the following API Documentation:

  • insertOne()

  • Document

  • InsertOneResult

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