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.. _kotlin-sync-get-started: | ||
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======================================= | ||
Get Started with the Kotlin Sync Driver | ||
======================================= | ||
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.. contents:: On this page | ||
:local: | ||
:backlinks: none | ||
:depth: 2 | ||
:class: singlecol | ||
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.. facet:: | ||
:name: genre | ||
:values: tutorial | ||
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.. meta:: | ||
:description: Learn how to create an app to connect to MongoDB deployment by using the Kotlin Sync driver. | ||
:keywords: quick start, tutorial, basics | ||
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.. toctree:: | ||
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/get-started/download-and-install/ | ||
/get-started/create-a-deployment/ | ||
/get-started/create-a-connection-string/ | ||
/get-started/connect-to-mongodb/ | ||
/get-started/next-steps/ | ||
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Overview | ||
-------- | ||
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You can use the {+driver-short+} to connect to and communicate with | ||
MongoDB. This guide shows you how to create an application that uses | ||
the {+driver-short+} to connect to a MongoDB cluster hosted on | ||
MongoDB Atlas and interact with data. | ||
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.. tip:: | ||
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MongoDB Atlas is a fully managed cloud database service that hosts your MongoDB | ||
deployments. You can create your own free (no credit card required) MongoDB Atlas | ||
deployment by following the steps in this guide. | ||
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Follow this guide to connect a sample {+language+} application to a MongoDB Atlas | ||
deployment. If you prefer to connect to MongoDB using a different driver or | ||
programming language, see the :driver:`list of official MongoDB drivers <>`. | ||
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.. button:: Next: Download and Install | ||
:uri: /get-started/download-and-install/ |
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.. _kotlin-sync-connect-to-mongodb: | ||
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================== | ||
Connect to MongoDB | ||
================== | ||
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.. procedure:: | ||
:style: connected | ||
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.. step:: Create the Application File | ||
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Create a file called ``DemoDataClassExample.kt`` in your project. | ||
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Copy the following sample code into the file and replace the value of | ||
the ``<connection URI string>`` placeholder with your MongoDB | ||
Atlas connection string that you saved in the preceding step. | ||
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.. literalinclude:: /includes/get-started/DemoDataClassExample.kt | ||
:language: kotlin | ||
:caption: DemoDataClassExample.kt | ||
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.. note:: | ||
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This example uses a {+language+} data class to model MongoDB data. | ||
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.. step:: Run the Application | ||
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When you run the application, it prints the details | ||
of a movie document that matches the query, as shown in the | ||
following output: | ||
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.. code-block:: none | ||
:copyable: false | ||
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Movie(title=Before Sunrise, year=1995, directors=[Richard Linklater]) | ||
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If you don't see any output or receive an error, check whether you | ||
included the proper connection string in your application. Also, confirm | ||
that you successfully loaded the sample dataset into your MongoDB Atlas cluster. | ||
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After completing this step, you have a working application that uses | ||
the {+driver-short+} to connect to your MongoDB cluster, run a query on the | ||
sample data, and print out the result. | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. Indentation here is breaking formatting |
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.. step:: Use the Document Class to Model Data (Alternative) | ||
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The preceding step demonstrates how to run a query on a sample | ||
collection to retrieve data by using a {+language+} data class. This section | ||
shows how to use the `Document <{+core-api+}/bson/org/bson/Document.html>`__ class | ||
to store and retrieve data from MongoDB. | ||
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In a file called ``DemoDocumentExample.kt``, paste the following sample | ||
code to run a query on your sample dataset in MongoDB Atlas. Replace the | ||
value of the ``<connection URI string>`` placeholder with your | ||
MongoDB Atlas connection string: | ||
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.. literalinclude:: /includes/get-started/DemoDocumentExample.kt | ||
:caption: DemoDocumentExample.kt | ||
:language: kotlin | ||
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When you run the application, it prints the details | ||
of a movie document that matches the query, as shown in the | ||
following output: | ||
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.. code-block:: none | ||
:copyable: false | ||
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Document{{_id=..., plot=A young man and woman ..., genres=[Drama, Romance], ...}} | ||
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If you don't see any output or receive an error, check whether you | ||
included the proper connection string in your application. Also, confirm | ||
that you successfully loaded the sample dataset into your MongoDB | ||
Atlas cluster. | ||
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After you complete these steps, you have a working application that | ||
uses the driver to connect to your MongoDB deployment, runs a query on | ||
the sample data, and prints out the result. | ||
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.. include:: /includes/get-started/quickstart-troubleshoot.rst | ||
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.. button:: Next Steps | ||
:uri: /get-started/next-steps/ | ||
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.. TODO add after output .. tip:: Data Classes | ||
.. | ||
.. To learn more about using data classes to store and retrieve data, | ||
.. see the :ref:`fundamentals-data-classes` guide. |
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.. _kotlin-sync-get-started-connection-string: | ||
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========================== | ||
Create a Connection String | ||
========================== | ||
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You can connect to your MongoDB deployment by providing a | ||
**connection URI**, also called a *connection string*, which | ||
instructs the driver on how to connect to a MongoDB deployment | ||
and how to behave while connected. | ||
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The connection string includes the hostname or IP address and | ||
port of your deployment, the authentication mechanism, user credentials | ||
when applicable, and connection options. | ||
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.. TODO To connect to an instance or deployment not hosted on Atlas, see | ||
.. :ref:`kotlin-sync-connection-targets`. | ||
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.. procedure:: | ||
:style: connected | ||
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.. step:: Find your MongoDB Atlas Connection String | ||
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To retrieve your connection string for the deployment that | ||
you created in the :ref:`previous step <kotlin-sync-get-started-create-deployment>`, | ||
log into your Atlas account, navigate to the | ||
:guilabel:`Database` section, then click the :guilabel:`Connect` button | ||
for your new deployment. | ||
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.. figure:: /includes/figures/atlas_connection_select_cluster.png | ||
:alt: The connect button in the clusters section of the Atlas UI | ||
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Proceed to the :guilabel:`Connect your application` section, then select | ||
**{+language+}** from the :guilabel:`Driver` selection menu. | ||
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Select the :guilabel:`Password (SCRAM)` authentication mechanism. | ||
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Deselect the :guilabel:`Include full driver code example` option to view | ||
only the connection string. | ||
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.. step:: Copy your Connection String | ||
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Click the button on the right of the connection string to copy it to | ||
your clipboard as shown in the following screenshot: | ||
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.. figure:: /includes/figures/atlas_connection_copy_string_kotlin.png | ||
:alt: The connection string copy button in the Atlas UI | ||
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.. step:: Update the Placeholders | ||
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Paste this connection string into a file in your preferred text editor | ||
and replace the ``<username>`` and ``<password>`` placeholders with | ||
your database user's username and password. | ||
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Save this file to a safe location to use in the next step. | ||
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After completing these steps, you have a connection string that | ||
contains your database username and password. | ||
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.. include:: /includes/get-started/quickstart-troubleshoot.rst | ||
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.. button:: Next: Connect to MongoDB | ||
:uri: /get-started/connect-to-mongodb/ |
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.. _kotlin-sync-get-started-create-deployment: | ||
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=========================== | ||
Create a MongoDB Deployment | ||
=========================== | ||
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You can create a free tier MongoDB deployment on MongoDB Atlas | ||
to store and manage your data. MongoDB Atlas hosts and manages | ||
your MongoDB database in the cloud. | ||
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.. procedure:: | ||
:style: connected | ||
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.. step:: Create a Free MongoDB deployment on Atlas | ||
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Complete the :atlas:`Get Started with Atlas </getting-started>` | ||
guide to set up a new Atlas account and load sample data into a new free | ||
tier MongoDB deployment. | ||
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.. step:: Save your Credentials | ||
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After you create your database user, save the user's | ||
username and password to a safe location for use in an upcoming step. | ||
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After you complete these steps, you have a new free tier MongoDB | ||
deployment on Atlas, database user credentials, and sample data loaded | ||
in your database. | ||
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.. include:: /includes/get-started/quickstart-troubleshoot.rst | ||
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.. button:: Next: Create a Connection String | ||
:uri: /get-started/create-a-connection-string/ |
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.. _kotlin-sync-download-install: | ||
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==================== | ||
Download and Install | ||
==================== | ||
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.. procedure:: | ||
:style: connected | ||
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.. step:: Install {+language+} | ||
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Make sure that your system has {+language+} installed and running | ||
on JDK 1.8 or later. For more information on getting started with | ||
{+language+} and JVM development, see `Get started with Kotlin/JVM | ||
<{+kotlin-docs+}/docs/jvm-get-started.html>`__ in the {+language+} | ||
language documentation. | ||
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.. step:: Create a {+language+} Project | ||
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This guide shows you how to add the {+driver-short+} dependencies | ||
by using Gradle or Maven. We recommend that you use an integrated development | ||
environment (IDE) such as IntelliJ IDEA or Eclipse IDE to configure | ||
Gradle or Maven to build and run your project. | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. The instructions in step 1 dictate using IntelliJ to create a Kotlin project, so a reader who gets to step 2: Create a Project might have already created the project. Suggestion would be maybe to reconfigure this to be installing the IDE in step 1 and linking to the Kotlin docs to create the project in step 2? Happy to discuss further. There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. How about we get rid of step 1 and move that information into step 2? There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. That also works! |
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.. tip:: | ||
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If you are not using an IDE, see the | ||
`Creating New Gradle Builds | ||
<https://guides.gradle.org/creating-new-gradle-builds/>`__ guide | ||
or the `Building Maven | ||
<https://maven.apache.org/guides/development/guide-building-maven.html>`__ guide | ||
for more information on how to set up your project. | ||
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.. step:: Add MongoDB as a Dependency | ||
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If you are using `Gradle <https://gradle.org/>`__ to manage your | ||
packages, add the following entry to your ``build.gradle.kts`` | ||
dependencies list: | ||
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.. include:: /includes/kotlin-sync-driver-gradle-versioned.rst | ||
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If you are using `Maven <https://maven.apache.org/>`__ to manage your | ||
packages, add the following entry to your ``pom.xml`` dependencies list: | ||
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.. include:: /includes/kotlin-sync-driver-maven-versioned.rst | ||
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After you configure your dependencies, ensure that they are | ||
available to your project by running the dependency manager and | ||
refreshing the project in your IDE. | ||
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.. step:: Add Serialization Library Dependencies | ||
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To enable the driver to convert between {+language+} objects and BSON, the | ||
data format for documents in MongoDB, you must also add one or both of the | ||
following serialization packages to your application: | ||
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- ``bson-kotlinx`` *(Recommended)* | ||
- ``bson-kotlin`` | ||
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If you are using Gradle to manage your packages, add one of the following | ||
entries to your ``build.gradle.kts`` dependencies list: | ||
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.. include:: /includes/serialization-libs-gradle-versioned.rst | ||
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If you are using Maven to manage your packages, add one of the following | ||
entries to your ``pom.xml`` dependencies list: | ||
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.. include:: /includes/serialization-libs-maven-versioned.rst | ||
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After you configure your dependencies, ensure that they are available to your | ||
project by running the dependency manager and refreshing the | ||
project in your IDE. | ||
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.. To learn more about these packages, see | ||
.. :ref:`kotlin-sync-serialization`. | ||
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After you complete these steps, you have a new project directory | ||
and the driver dependencies installed. | ||
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.. include:: /includes/get-started/quickstart-troubleshoot.rst | ||
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.. button:: Next: Create a MongoDB Deployment | ||
:uri: /get-started/create-a-deployment/ |
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.. _kotlin-sync-get-started-next-steps: | ||
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========== | ||
Next Steps | ||
========== | ||
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Congratulations on completing the tutorial! | ||
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In this tutorial, you created a {+language+} application that | ||
connects to a MongoDB deployment hosted on MongoDB Atlas | ||
and retrieves a document that matches a query. | ||
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Learn more about the {+driver-short+} from the following resources: | ||
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- Learn how to perform read operations in the :ref:`<kotlin-sync-read>` section. | ||
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.. TODO - Learn how to perform write operations in the :ref:`<kotlin-sync-write>` section. |
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import com.mongodb.client.model.Filters.eq | ||
import com.mongodb.kotlin.client.MongoClient | ||
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// Create data class to represent a MongoDB document | ||
data class Movie(val title: String, val year: Int, val directors: List<String>) | ||
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fun main() { | ||
// Replace the placeholder with your MongoDB deployment's connection string | ||
val uri = "<connection URI string>" | ||
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val mongoClient = MongoClient.create(uri) | ||
val database = mongoClient.getDatabase("sample_mflix") | ||
val collection = database.getCollection<Movie>("movies") | ||
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// Find a document with the specified title | ||
val doc = collection.find(eq(Movie::title.name, "Before Sunrise")).firstOrNull() | ||
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if (doc != null) { | ||
// Print the matching document | ||
println(doc) | ||
} else { | ||
println("No matching documents found.") | ||
} | ||
} |
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I'm seeing that we have a task to add a Specialized Data Formats > Data Classes page, could be a good idea to leave a TODO here to link to that page for more info once it's built.
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Theres a tip commented out at the bottom that will link to that page. Right now, I cant figure out how to comment things out in the body of a step