Start Using the Kotlin SDK

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You can track the status of your feedback using the ticket number displayed in the dialog once you submit the form. </p> </div> </div> </div> <main class="article" data-ceiling="topbar"> <div class="article-header"> <nav class="crumbs" aria-label="breadcrumbs"> <ul> <li class="crumb"><a href="overview.html">Kotlin SDK</a></li> <li class="crumb">Getting Started</li> <li class="crumb"><a href="start-using-sdk.html">Start Using the Kotlin SDK</a></li> </ul> </nav> </div> <article class="doc"> <div class="page-heading-title"> <h1 class="page">Start Using the Kotlin SDK</h1> <div class="labels"> <ul><li class="tutorial"><span><i class="fas fa-book-reader"></i> tutorial</span></li> </ul> </div> </div> <div class="contributor-list-box"> <span class="last-commit-date" id="commitdate"> </span> <ul id="contributorList"></ul> <span id="otherContributor"> + </span> </div><div id="preamble"> <div class="sectionbody"> <div class="quoteblock abstract"> <blockquote> A Kotlin application running on the JVM can use the Couchbase Kotlin SDK to access a Couchbase cluster. </blockquote> </div> <div class="paragraph"> <p>The Couchbase Kotlin SDK is built on top of the same high performance I/O core as the Couchbase Java SDK. It provides idiomatic Kotlin features like default arguments, suspend functions, and tasteful DSLs.</p> </div> </div> </div> <div class="sect1"> <h2 id="prerequisites"><a class="anchor" href="#prerequisites"></a>Before You Start</h2> <div class="sectionbody"> <div class="ulist"> <ul> <li> <p>You should know <a href="https://kotlinlang.org/docs/gradle.html">how to set up a new Kotlin project using Gradle</a> (or <a href="https://kotlinlang.org/docs/maven.html">using Maven</a>). The SDK requires Kotlin 1.6.20 or later.</p> </li> <li> <p>You will need Java 8 or later. We recommend running the latest Java LTS version with the highest patch version available.</p> </li> </ul> </div> </div> </div> <div class="sect1"> <h2 id="installing-the-sdk"><a class="anchor" href="#installing-the-sdk"></a>Installing the SDK</h2> <div class="sectionbody"> <div class="paragraph"> <p>All stable versions of the SDK are <a href="https://central.sonatype.com/artifact/com.couchbase.client/kotlin-client/1.4.0">available on Maven Central</a>.</p> </div> <div class="paragraph"> <p>You can use your favorite dependency management tool to include the SDK in your project.</p> </div> <div id="tabs-1" class="openblock tabs is-sync is-loading"> <div class="content"> <div class="ulist tablist"> <ul> <li id="tabs-1-gradle-kotlin" class="tab"> <p>Gradle (Kotlin)</p> </li> <li id="tabs-1-gradle-groovy" class="tab"> <p>Gradle (Groovy)</p> </li> <li id="tabs-1-maven" class="tab"> <p>Maven</p> </li> </ul> </div> <div id="tabs-1-gradle-kotlin--panel" class="tabpanel" aria-labelledby="tabs-1-gradle-kotlin"> <div class="listingblock"> <div class="content"> <pre class="highlightjs highlight"><code class="language-kotlin hljs" data-lang="kotlin">implementation("com.couchbase.client:kotlin-client:1.4.0")</code></pre> </div> </div> </div> <div id="tabs-1-gradle-groovy--panel" class="tabpanel" aria-labelledby="tabs-1-gradle-groovy"> <div class="listingblock"> <div class="content"> <pre class="highlightjs highlight"><code class="language-groovy hljs" data-lang="groovy">implementation "com.couchbase.client:kotlin-client:1.4.0"</code></pre> </div> </div> </div> <div id="tabs-1-maven--panel" class="tabpanel" aria-labelledby="tabs-1-maven"> <div class="listingblock"> <div class="content"> <pre class="highlightjs highlight"><code class="language-xml hljs" data-lang="xml"><dependency> <groupId>com.couchbase.client</groupId> <artifactId>kotlin-client</artifactId> <version>1.4.0</version> </dependency></code></pre> </div> </div> </div> </div> </div> </div> </div> <div class="sect1"> <h2 id="using-a-snapshot-version-optional"><a class="anchor" href="#using-a-snapshot-version-optional"></a>Using a Snapshot Version (optional)</h2> <div class="sectionbody"> <div class="paragraph"> <p>Couchbase publishes pre-release snapshot artifacts to the Sonatype OSS Snapshot Repository. If you wish to use a snapshot version, you’ll need to tell your build tool about this repository.</p> </div> <div id="tabs-2" class="openblock tabs is-sync is-loading"> <div class="content"> <div class="ulist tablist"> <ul> <li id="tabs-2-gradle-kotlin" class="tab"> <p>Gradle (Kotlin)</p> </li> <li id="tabs-2-gradle-groovy" class="tab"> <p>Gradle (Groovy)</p> </li> <li id="tabs-2-maven" class="tab"> <p>Maven</p> </li> </ul> </div> <div id="tabs-2-gradle-kotlin--panel" class="tabpanel" aria-labelledby="tabs-2-gradle-kotlin"> <div class="listingblock"> <div class="title"><code><strong>build.gradle.kts</strong></code></div> <div class="content"> <pre class="highlightjs highlight"><code class="language-kotlin hljs" data-lang="kotlin">repositories { mavenCentral() maven { url = uri("https://oss.sonatype.org/content/repositories/snapshots") mavenContent { snapshotsOnly() } } }</code></pre> </div> </div> </div> <div id="tabs-2-gradle-groovy--panel" class="tabpanel" aria-labelledby="tabs-2-gradle-groovy"> <div class="listingblock"> <div class="title"><code><strong>build.gradle</strong></code></div> <div class="content"> <pre class="highlightjs highlight"><code class="language-groovy hljs" data-lang="groovy">repositories { mavenCentral() maven { url "https://oss.sonatype.org/content/repositories/snapshots" mavenContent { snapshotsOnly() } } }</code></pre> </div> </div> </div> <div id="tabs-2-maven--panel" class="tabpanel" aria-labelledby="tabs-2-maven"> <div class="listingblock"> <div class="title"><code><strong>pom.xml</strong></code></div> <div class="content"> <pre class="highlightjs highlight"><code class="language-xml hljs" data-lang="xml"><repositories> <repository> <id>sonatype-snapshots</id> <url>https://oss.sonatype.org/content/repositories/snapshots</url> <releases><enabled>false</enabled></releases> <snapshots><enabled>true</enabled></snapshots> </repository> </repositories></code></pre> </div> </div> </div> </div> </div> </div> </div> <div class="sect1"> <h2 id="hello-couchbase"><a class="anchor" href="#hello-couchbase"></a>Hello Couchbase</h2> <div class="sectionbody"> <div class="paragraph"> <p>Here’s an example that shows how to execute a SQL++ (formerly N1QL) query and get a document from the Key Value (KV) service.</p> </div> <div id="tabs-3" class="openblock tabs is-sync is-loading"> <div class="content"> <div class="ulist tablist"> <ul> <li id="tabs-3-couchbase-capella" class="tab"> <p>Couchbase Capella</p> </li> <li id="tabs-3-local-couchbase-server" class="tab"> <p>Local Couchbase Server</p> </li> </ul> </div> <div id="tabs-3-couchbase-capella--panel" class="tabpanel" aria-labelledby="tabs-3-couchbase-capella"> <div class="paragraph"> <p>This version of the example assumes you are connecting to a <a href="https://docs.couchbase.com/cloud/index.html">Couchbase Capella</a> free tier operational cluster, which has the <code>travel-sample</code> bucket installed by default.</p> </div> <div class="paragraph"> <p>(If you’re not using Couchbase Capella, click the <strong>Local Couchbase Server</strong> tab above.)</p> </div> <div class="paragraph"> <p>Before running the example:</p> </div> <div class="ulist"> <ul> <li> <p>Replace the <code>address</code> variable with the address of your Capella cluster.</p> </li> <li> <p>Replace the <code>username</code> and <code>password</code> arguments with credentials for a cluster user that can read the <code>travel-sample</code> bucket.</p> </li> </ul> </div> <div class="listingblock"> <div class="content"> <pre class="highlightjs highlight"><code class="language-kotlin hljs" data-lang="kotlin" data-source-url="https://github.com/couchbase/docs-sdk-kotlin/blob/4a3220a43b93c4669258607458976f5f0d5f7c39/modules/hello-world/examples/HelloCloud.kt">import com.couchbase.client.kotlin.Cluster import com.couchbase.client.kotlin.query.execute import kotlinx.coroutines.runBlocking import kotlin.time.Duration.Companion.seconds fun main() { // Replace with your cluster address. val address = "--your-cluster--.cloud.couchbase.com" val cluster = Cluster.connect( connectionString = "couchbases://$address", <i class="conum" data-value="1"></i><b>(1)</b> username = "username", // Replace with credentials password = "password", // of a database user account. ) try { runBlocking { val collection = cluster .bucket("travel-sample") .waitUntilReady(10.seconds) .defaultCollection() // Execute a N1QL query val queryResult = cluster .query("select * from `travel-sample` limit 3") .execute() queryResult.rows.forEach { println(it) } println(queryResult.metadata) // Get a document from the K/V service val getResult = collection.get("airline_10") println(getResult) println(getResult.contentAs<Map<String, Any?>>()) } } finally { runBlocking { cluster.disconnect() } } }</code></pre> </div> </div> <div class="colist arabic"> <table> <tr> <td><i class="conum" data-value="1"></i><b>1</b></td> <td>For Capella, the connection string starts with <code>couchbases://</code> (note the final 's') to enable a secure connection with TLS.</td> </tr> </table> </div> </div> <div id="tabs-3-local-couchbase-server--panel" class="tabpanel" aria-labelledby="tabs-3-local-couchbase-server"> <div class="paragraph"> <p>This version of the example assumes you are connecting to a single-node Couchbase Server cluster running on your local computer.</p> </div> <div class="paragraph"> <p>Before running the example:</p> </div> <div class="ulist"> <ul> <li> <p>Install the <code>travel-sample</code> <a href="../../../server/current/manage/manage-settings/install-sample-buckets.html" class="xref page">sample bucket</a>.</p> </li> <li> <p>Replace the <code>username</code> and <code>password</code> arguments with credentials for a cluster user that can read the <code>travel-sample</code> bucket. You can use the administrator credentials you chose when setting up the cluster.</p> </li> </ul> </div> <div class="listingblock"> <div class="content"> <pre class="highlightjs highlight"><code class="language-kotlin hljs" data-lang="kotlin" data-source-url="https://github.com/couchbase/docs-sdk-kotlin/blob/4a3220a43b93c4669258607458976f5f0d5f7c39/modules/hello-world/examples/HelloWorld.kt">import com.couchbase.client.kotlin.Cluster import com.couchbase.client.kotlin.query.execute import kotlinx.coroutines.runBlocking import kotlin.time.Duration.Companion.seconds fun main() { val cluster = Cluster.connect( connectionString = "couchbase://127.0.0.1", username = "username", // Replace with credentials password = "password", // of a database user account. ) try { runBlocking { val collection = cluster .bucket("travel-sample") .waitUntilReady(10.seconds) .defaultCollection() // Execute a N1QL query val queryResult = cluster .query("select * from `travel-sample` limit 3") .execute() queryResult.rows.forEach { println(it) } println(queryResult.metadata) // Get a document from the K/V service val getResult = collection.get("airline_10") println(getResult) println(getResult.contentAs<Map<String, Any?>>()) } } finally { runBlocking { cluster.disconnect() } } }</code></pre> </div> </div> </div> </div> </div> </div> </div> <div class="sect1"> <h2 id="additional-resources"><a class="anchor" href="#additional-resources"></a>Additional Resources</h2> <div class="sectionbody"> <div class="paragraph"> <p>To see more documentation, select a chapter from the navigation sidebar on the left.</p> </div> <div class="paragraph"> <p>Join us on the <a href="https://discord.com/invite/sQ5qbPZuTh">Couchbase Discord server</a> and the <a href="https://forums.couchbase.com/c/kotlin-sdk/40">Couchbase Forum</a>.</p> </div> <div class="paragraph"> <p>The <a href="https://couchbase.live">Couchbase Playground</a> has Kotlin examples you can edit and run in your web browser.</p> </div> <div class="paragraph"> <p>There are more <a href="https://github.com/couchbase/couchbase-jvm-clients/tree/master/kotlin-client/src/main/kotlin/com/couchbase/client/kotlin/samples">code samples on GitHub</a>.</p> </div> <div class="paragraph"> <p>The API reference is <a href="https://docs.couchbase.com/sdk-api/couchbase-kotlin-client/">here</a>.</p> </div> <div class="paragraph"> <p>Couchbase welcomes community contributions to the Kotlin SDK. 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