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class="navGroups"><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Getting started<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.23.0/design/index.html">Introduction to Apache Druid</a></li><li class="navListItem"><a class="navItem" href="/docs/0.23.0/tutorials/index.html">Quickstart</a></li><li class="navListItem"><a class="navItem" href="/docs/0.23.0/tutorials/docker.html">Docker</a></li><li class="navListItem"><a class="navItem" href="/docs/0.23.0/operations/single-server.html">Single server deployment</a></li><li class="navListItem"><a class="navItem" href="/docs/0.23.0/tutorials/cluster.html">Clustered deployment</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Tutorials<span class="arrow"><svg 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href="/docs/0.23.0/ingestion/compaction.html">Compaction</a></li><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Stream ingestion</h4><ul><li class="navListItem"><a class="navItem" href="/docs/0.23.0/development/extensions-core/kafka-ingestion.html">Apache Kafka ingestion</a></li><li class="navListItem"><a class="navItem" href="/docs/0.23.0/development/extensions-core/kafka-supervisor-reference.html">Apache Kafka supervisor</a></li><li class="navListItem"><a class="navItem" href="/docs/0.23.0/development/extensions-core/kafka-supervisor-operations.html">Apache Kafka operations</a></li><li class="navListItem"><a class="navItem" href="/docs/0.23.0/development/extensions-core/kinesis-ingestion.html">Amazon Kinesis</a></li></ul></div><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Batch ingestion</h4><ul><li class="navListItem"><a class="navItem" href="/docs/0.23.0/ingestion/native-batch.html">Native batch</a></li><li class="navListItem"><a 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href="/docs/0.23.0/querying/sorting-orders.html">String comparators</a></li><li class="navListItem"><a class="navItem" href="/docs/0.23.0/querying/virtual-columns.html">Virtual columns</a></li><li class="navListItem"><a class="navItem" href="/docs/0.23.0/development/geo.html">Spatial filters</a></li></ul></div></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Configuration<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.23.0/configuration/index.html">Configuration reference</a></li><li class="navListItem"><a class="navItem" href="/docs/0.23.0/development/extensions.html">Extensions</a></li><li class="navListItem"><a class="navItem" href="/docs/0.23.0/configuration/logging.html">Logging</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Operations<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.23.0/operations/druid-console.html">Web console</a></li><li class="navListItem"><a class="navItem" href="/docs/0.23.0/operations/getting-started.html">Getting started with Apache Druid</a></li><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Security</h4><ul><li class="navListItem"><a class="navItem" href="/docs/0.23.0/operations/security-overview.html">Security overview</a></li><li class="navListItem"><a class="navItem" href="/docs/0.23.0/operations/security-user-auth.html">User authentication and authorization</a></li><li class="navListItem"><a class="navItem" href="/docs/0.23.0/operations/auth-ldap.html">LDAP 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href="/docs/0.23.0/operations/rule-configuration.html">Retaining or automatically dropping data</a></li><li class="navListItem"><a class="navItem" href="/docs/0.23.0/operations/other-hadoop.html">Working with different versions of Apache Hadoop</a></li><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Misc</h4><ul><li class="navListItem"><a class="navItem" href="/docs/0.23.0/operations/management-uis.html">Legacy Management UIs</a></li><li class="navListItem"><a class="navItem" href="/docs/0.23.0/operations/dump-segment.html">dump-segment tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.23.0/operations/reset-cluster.html">reset-cluster tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.23.0/operations/insert-segment-to-db.html">insert-segment-to-db tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.23.0/operations/pull-deps.html">pull-deps tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.23.0/operations/deep-storage-migration.html">Deep storage migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.23.0/operations/export-metadata.html">Export Metadata Tool</a></li><li class="navListItem"><a class="navItem" href="/docs/0.23.0/operations/metadata-migration.html">Metadata Migration</a></li><li class="navListItem"><a class="navItem" href="/docs/0.23.0/operations/use_sbt_to_build_fat_jar.html">Content for build.sbt</a></li></ul></div></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Development<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.23.0/development/overview.html">Developing on Druid</a></li><li class="navListItem"><a class="navItem" 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| </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/querying/sql-jdbc.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">SQL JDBC driver API</h1></header><article><div><span><!-- |
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| <blockquote> |
| <p>Apache Druid supports two query languages: Druid SQL and <a href="/docs/0.23.0/querying/querying.html">native queries</a>. |
| This document describes the SQL language.</p> |
| </blockquote> |
| <p>You can make <a href="/docs/0.23.0/querying/sql.html">Druid SQL</a> queries using the <a href="https://calcite.apache.org/avatica/downloads/">Avatica JDBC driver</a>. We recommend using Avatica JDBC driver version 1.17.0 or later. Note that as of the time of this writing, Avatica 1.17.0, the latest version, does not support passing connection string parameters from the URL to Druid, so you must pass them using a <code>Properties</code> object. Once you've downloaded the Avatica client jar, add it to your classpath and use the connect string <code>jdbc:avatica:remote:url=http://BROKER:8082/druid/v2/sql/avatica/</code>.</p> |
| <p>Example code:</p> |
| <pre><code class="hljs css language-java"><span class="hljs-comment">// Connect to /druid/v2/sql/avatica/ on your Broker.</span> |
| String url = <span class="hljs-string">"jdbc:avatica:remote:url=http://localhost:8082/druid/v2/sql/avatica/"</span>; |
| |
| <span class="hljs-comment">// Set any connection context parameters you need here</span> |
| <span class="hljs-comment">// Or leave empty for default behavior.</span> |
| Properties connectionProperties = <span class="hljs-keyword">new</span> Properties(); |
| |
| <span class="hljs-keyword">try</span> (Connection connection = DriverManager.getConnection(url, connectionProperties)) { |
| <span class="hljs-keyword">try</span> ( |
| <span class="hljs-keyword">final</span> Statement statement = connection.createStatement(); |
| <span class="hljs-keyword">final</span> ResultSet resultSet = statement.executeQuery(query) |
| ) { |
| <span class="hljs-keyword">while</span> (resultSet.next()) { |
| <span class="hljs-comment">// process result set</span> |
| } |
| } |
| } |
| </code></pre> |
| <p>It is also possible to use a protocol buffers JDBC connection with Druid, this offer reduced bloat and potential performance |
| improvements for larger result sets. To use it apply the following connection url instead, everything else remains the same</p> |
| <pre><code class="hljs"><span class="hljs-attribute">String url</span> = <span class="hljs-string">"jdbc:avatica:remote:url=http://localhost:8082/druid/v2/sql/avatica-protobuf/;serialization=protobuf"</span>; |
| </code></pre> |
| <blockquote> |
| <p>The protobuf endpoint is also known to work with the official <a href="https://github.com/apache/calcite-avatica-go">Golang Avatica driver</a></p> |
| </blockquote> |
| <p>Table metadata is available over JDBC using <code>connection.getMetaData()</code> or by querying the |
| <a href="/docs/0.23.0/querying/sql-metadata-tables.html">"INFORMATION_SCHEMA" tables</a>.</p> |
| <h2><a class="anchor" aria-hidden="true" id="connection-stickiness"></a><a href="#connection-stickiness" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Connection stickiness</h2> |
| <p>Druid's JDBC server does not share connection state between Brokers. This means that if you're using JDBC and have |
| multiple Druid Brokers, you should either connect to a specific Broker, or use a load balancer with sticky sessions |
| enabled. The Druid Router process provides connection stickiness when balancing JDBC requests, and can be used to achieve |
| the necessary stickiness even with a normal non-sticky load balancer. Please see the |
| <a href="/docs/0.23.0/design/router.html">Router</a> documentation for more details.</p> |
| <p>Note that the non-JDBC <a href="/docs/0.23.0/querying/sql-api.html#submit-a-query">JSON over HTTP</a> API is stateless and does not require stickiness.</p> |
| <h2><a class="anchor" aria-hidden="true" id="dynamic-parameters"></a><a href="#dynamic-parameters" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Dynamic parameters</h2> |
| <p>You can use <a href="/docs/0.23.0/querying/sql.html#dynamic-parameters">parameterized queries</a> in JDBC code, as in this example:</p> |
| <pre><code class="hljs css language-java">PreparedStatement statement = connection.prepareStatement(<span class="hljs-string">"SELECT COUNT(*) AS cnt FROM druid.foo WHERE dim1 = ? OR dim1 = ?"</span>); |
| statement.setString(<span class="hljs-number">1</span>, <span class="hljs-string">"abc"</span>); |
| statement.setString(<span class="hljs-number">2</span>, <span class="hljs-string">"def"</span>); |
| <span class="hljs-keyword">final</span> ResultSet resultSet = statement.executeQuery(); |
| </code></pre> |
| </span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/0.23.0/querying/sql-api.html"><span class="arrow-prev">← </span><span>Druid SQL API</span></a><a class="docs-next button" href="/docs/0.23.0/querying/sql-query-context.html"><span>SQL query context</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#connection-stickiness">Connection stickiness</a></li><li><a href="#dynamic-parameters">Dynamic parameters</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/0.23.0/latest">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2019 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script> |
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