Connect to MongoDB from Kotlin
Connect to MongoDB from Kotlin – In this tutorial, we shall learn to connect to MongoDB from Kotlin Application.
To connect to MongoDB from Kotlin Application, follow this step by step guide.
1. Download MongoDB Java Driver
Download latest available MongoDB Java Driver from Maven Repository. [https://mvnrepository.com/artifact/org.mongodb/mongo-java-driver/] For this tutorial, we shall download 3.5.0, which was then latest.
2. Add jar file to the build path
In IntelliJ IDEA, copy the jar file to lib folder, then right click on the jar file and ‘Add as Library’.
In Eclipse, follow the navigation path: Project -> Properties -> Java Build Path -> Libraries -> Add Jars -> Select the jar -> Click “Apply” -> Click “OK”
3. Create MongoClient
In your Kotlin Application, create a new MongoClient with host and port provided as arguments to the constructor.
mongoClient = MongoClient( host , port )
host (String) and port (Integer) are IP Address or hostname and Port Number respectively at which MongoDB Daemon Service is running. If the details provided are successful, mongoClient creates a new Client to the MongoDB.
4. MongoClient is Ready
If there is no exception thrown during MongoClient creation, your MongoClient is successfully connected to MongoDB.
5. Close connection to MongoDB
Once you are done with the MongoDB Operations, close the connection between MongoClient and MongoDB Daemon Service.
mongoClient!!.close()
Example – Connection to MongoDB using Kotlin
In this example Kotlin Program, we will establish a connection to MongoDB by creating a MongoClient object.
import com.mongodb.MongoClient
import com.mongodb.MongoException
/**
* Created by TutorialKart on 31/10/17.
*/
object KotlinMongoConnectionExample {
@JvmStatic
fun main(args: Array<String>) {
var mongoClient: MongoClient? = null
try {
mongoClient = MongoClient("127.0.0.1", 27017)
println("Connected to MongoDB!")
} catch (e: MongoException) {
e.printStackTrace()
} finally {
mongoClient!!.close()
}
}
} Output
Nov 01, 2017 9:08:55 AM com.mongodb.diagnostics.logging.JULLogger log
INFO: Cluster created with settings {hosts=[127.0.0.1:27017], mode=SINGLE, requiredClusterType=UNKNOWN, serverSelectionTimeout='30000 ms', maxWaitQueueSize=500}
Connected to MongoDB! Conclusion
In this MongoDB Tutorial, we have learnt to make a connection to MongoDB from Kotlin Application using MongoDB Java Driver.