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| gitHub |
| <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav> <ul class="sidebar-links"><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>IoTDB User Guide (V0.11.x)</span> <!----></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Get Started</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Overview</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Concept</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Server</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>Client</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/UserGuide/V0.11.x/Client/Command Line Interface.html" class="sidebar-link">Command Line Interface</a></li><li><a href="/UserGuide/V0.11.x/Client/Programming - Native API.html" class="active sidebar-link">Native API</a></li><li><a href="/UserGuide/V0.11.x/Client/Programming - JDBC.html" class="sidebar-link">JDBC</a></li><li><a href="/UserGuide/V0.11.x/Client/Programming - Other Languages.html" class="sidebar-link">Other Languages</a></li><li><a href="/UserGuide/V0.11.x/Client/Programming - TsFile API.html" class="sidebar-link">TsFile API</a></li><li><a href="/UserGuide/V0.11.x/Client/Programming - MQTT.html" class="sidebar-link">MQTT</a></li><li><a href="/UserGuide/V0.11.x/Client/Status Codes.html" class="sidebar-link">Status Codes</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Operation Manual</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>System Tools</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Ecosystem Integration</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Architecture</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Comparison with TSDBs</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="content content__default"><h1 id="programming-native-api"><a href="#programming-native-api" class="header-anchor">#</a> Programming - Native API</h1> <h2 id="dependencies"><a href="#dependencies" class="header-anchor">#</a> Dependencies</h2> <ul><li>JDK >= 1.8</li> <li>Maven >= 3.1</li></ul> <h2 id="how-to-install-in-local-maven-repository"><a href="#how-to-install-in-local-maven-repository" class="header-anchor">#</a> How to install in local maven repository</h2> <p>In root directory:</p> <blockquote><p>mvn clean install -pl session -am -DskipTests</p></blockquote> <h2 id="using-iotdb-native-api-with-maven"><a href="#using-iotdb-native-api-with-maven" class="header-anchor">#</a> Using IoTDB Native API with Maven</h2> <div class="language- line-numbers-mode"><pre class="language-text"><code><dependencies> |
| <dependency> |
| <groupId>org.apache.iotdb</groupId> |
| <artifactId>iotdb-session</artifactId> |
| <version>0.11.1</version> |
| </dependency> |
| </dependencies> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br></div></div><h2 id="native-apis"><a href="#native-apis" class="header-anchor">#</a> Native APIs</h2> <p>Here we show the commonly used interfaces and their parameters in the Native API:</p> <ul><li><p>Initialize a Session</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>Session(String host, int rpcPort) |
| |
| Session(String host, String rpcPort, String username, String password) |
| |
| Session(String host, int rpcPort, String username, String password) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div></li> <li><p>Open a Session</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>Session.open() |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div></li> <li><p>Close a Session</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>Session.close() |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div></li> <li><p>Set storage group</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>void setStorageGroup(String storageGroupId) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p></p></li> <li><p>Delete one or several storage groups</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>void deleteStorageGroup(String storageGroup) |
| void deleteStorageGroups(List<String> storageGroups) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div></li> <li><p>Create one or multiple timeseries</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>void createTimeseries(String path, TSDataType dataType, |
| TSEncoding encoding, CompressionType compressor, Map<String, String> props, |
| Map<String, String> tags, Map<String, String> attributes, String measurementAlias) |
| |
| void createMultiTimeseries(List<String> paths, List<TSDataType> dataTypes, |
| List<TSEncoding> encodings, List<CompressionType> compressors, |
| List<Map<String, String>> propsList, List<Map<String, String>> tagsList, |
| List<Map<String, String>> attributesList, List<String> measurementAliasList) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br></div></div></li> <li><p>Delete one or several timeseries</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>void deleteTimeseries(String path) |
| void deleteTimeseries(List<String> paths) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div></li> <li><p>Delete data before or equal to a timestamp of one or several timeseries</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>void deleteData(String path, long time) |
| void deleteData(List<String> paths, long time) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div></li> <li><p>Insert a Record，which contains multiple measurement value of a device at a timestamp. Without type info the server has to do type inference, which may cost some time</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>void insertRecord(String deviceId, long time, List<String> measurements, List<String> values) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div></li> <li><p>Insert a Tablet，which is multiple rows of a device, each row has the same measurements</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>void insertTablet(Tablet tablet) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div></li> <li><p>Insert multiple Tablets</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>void insertTablets(Map<String, Tablet> tablet) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div></li> <li><p>Insert multiple Records. Without type info the server has to do type inference, which may cost some time</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>void insertRecords(List<String> deviceIds, List<Long> times, |
| List<List<String>> measurementsList, List<List<String>> valuesList) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div></li> <li><p>Insert a Record，which contains multiple measurement value of a device at a timestamp. With type info the server has no need to do type inference, which leads a better performance</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>void insertRecord(String deviceId, long time, List<String> measurements, |
| List<TSDataType> types, List<Object> values) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div></li> <li><p>Insert multiple Records. With type info the server has no need to do type inference, which leads a better performance</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>void insertRecords(List<String> deviceIds, List<Long> times, |
| List<List<String>> measurementsList, List<List<TSDataType>> typesList, |
| List<List<Object>> valuesList) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div></li></ul> <h2 id="native-apis-for-profiling-network-cost"><a href="#native-apis-for-profiling-network-cost" class="header-anchor">#</a> Native APIs for profiling network cost</h2> <ul><li><p>Test the network and client cost of insertRecords. This method NOT insert data into database and server just return after accept the request, this method should be used to test other time cost in client</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>void testInsertRecords(List<String> deviceIds, List<Long> times, |
| List<List<String>> measurementsList, List<List<String>> valuesList) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>or</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>void testInsertRecords(List<String> deviceIds, List<Long> times, |
| List<List<String>> measurementsList, List<List<TSDataType>> typesList, |
| List<List<Object>> valuesList) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div></li> <li><p>Test the network and client cost of insertRecord. This method NOT insert data into database and server just return after accept the request, this method should be used to test other time cost in client</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>void testInsertRecord(String deviceId, long time, List<String> measurements, List<String> values) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>or</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>void testInsertRecord(String deviceId, long time, List<String> measurements, |
| List<TSDataType> types, List<Object> values) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div></li> <li><p>Test the network and client cost of insertTablet. This method NOT insert data into database and server just return after accept the request, this method should be used to test other time cost in client</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>void testInsertTablet(Tablet tablet) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div></li></ul> <h2 id="sample-code"><a href="#sample-code" class="header-anchor">#</a> Sample code</h2> <p>To get more information of the following interfaces, please view session/src/main/java/org/apache/iotdb/session/Session.java</p> <p>The sample code of using these interfaces is in example/session/src/main/java/org/apache/iotdb/SessionExample.java，which provides an example of how to open an IoTDB session, execute a batch insertion.</p> <h2 id="session-pool-for-native-api"><a href="#session-pool-for-native-api" class="header-anchor">#</a> Session Pool for Native API</h2> <p>We provide a connection pool (`SessionPool) for Native API. |
| Using the interface, you need to define the pool size.</p> <p>If you can not get a session connection in 60 seconds, there is a warning log but the program will hang.</p> <p>If a session has finished an operation, it will be put back to the pool automatically. |
| If a session connection is broken, the session will be removed automatically and the pool will try |
| to create a new session and redo the operation.</p> <p>For query operations:</p> <ol><li>When using SessionPool to query data, the result set is <code>SessionDataSetWrapper</code>;</li> <li>Given a <code>SessionDataSetWrapper</code>, if you have not scanned all the data in it and stop to use it, |
| you have to call <code>SessionPool.closeResultSet(wrapper)</code> manually;</li> <li>When you call <code>hasNext()</code> and <code>next()</code> of a <code>SessionDataSetWrapper</code> and there is an exception, then |
| you have to call <code>SessionPool.closeResultSet(wrapper)</code> manually;</li> <li>You can call <code>getColumnNames()</code> of <code>SessionDataSetWrapper</code> to get the column names of query result;</li></ol> <p>Examples: <code>session/src/test/java/org/apache/iotdb/session/pool/SessionPoolTest.java</code></p> <p>Or <code>example/session/src/main/java/org/apache/iotdb/SessionPoolExample.java</code></p> <h2 id="_0-9-0-10-session-interface-updates"><a href="#_0-9-0-10-session-interface-updates" class="header-anchor">#</a> 0.9-0.10 Session Interface Updates</h2> <p>Significant chages are made in IoTDB session of version 0.10 compared to version 0.9. |
| A large numbers of new interfaces are added, and some old interfaces have new names or parameters. |
| Besides, all exceptions thrown by session interfaces are changed from <em>IoTDBSessionExeception</em> to <em>IoTDBConnectionException</em> or <em>StatementExecutionExeception</em>. |
| The detailed modifications are listed as follows.</p> <h3 id="method-name-modifications"><a href="#method-name-modifications" class="header-anchor">#</a> Method name modifications</h3> <h4 id="insert"><a href="#insert" class="header-anchor">#</a> insert()</h4> <p>Insert a Record，which contains deviceId, timestamp of the record and multiple measurement values</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>void insert(String deviceId, long time, List<String> measurements, List<String> values) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>The method name has been changed to insertRecord() in 0.10 version</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>void insertRecord(String deviceId, long time, List<String> measurements, List<String> values) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><h4 id="insertrowinbatch"><a href="#insertrowinbatch" class="header-anchor">#</a> insertRowInBatch()</h4> <p>Insert multiple Records, which contains all the deviceIds, timestamps of the records and multiple measurement values</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>void insertRowInBatch(List<String> deviceIds, List<Long> times, List<List<String>> measurementsList, |
| List<List<String>> valuesList) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>The method name has been changed to insertRecords() in 0.10 version</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>void insertRecords(List<String> deviceIds, List<Long> times, List<List<String>> measurementsList, |
| List<List<String>> valuesList) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><h4 id="insertbatch"><a href="#insertbatch" class="header-anchor">#</a> insertBatch()</h4> <p>In 0.9, insertBatch is used for insertion in terms of "RowBatch" structure.</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>void insertBatch(RowBatch rowBatch) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>As "Tablet" replaced "RowBatch" in 0.10, the name has been changed to insertTablet()</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>void insertTablet(Tablet tablet) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><h4 id="testinsertrow"><a href="#testinsertrow" class="header-anchor">#</a> testInsertRow()</h4> <p>To test the responsiveness of insertRow()</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>void testInsertRow(String deviceId, long time, List<String> measurements, List<String> values) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>The method name has been changed to testInsertRecord() in 0.10 version</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>void testInsertRecord(String deviceId, long time, List<String> measurements, List<String> values) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><h4 id="testinsertrowinbatch"><a href="#testinsertrowinbatch" class="header-anchor">#</a> testInsertRowInBatch()</h4> <p>To test the responsiveness of insertRowInBatch()</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>void testInsertRowInBatch(List<String> deviceIds, List<Long> times, List<List<String>> measurementsList, |
| List<List<String>> valuesList) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>The method name has been changed to testInsertRecords() in 0.10 version</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>void testInsertRecords(List<String> deviceIds, List<Long> times, List<List<String>> measurementsList, |
| List<List<String>> valuesList) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><h4 id="testinsertbatch"><a href="#testinsertbatch" class="header-anchor">#</a> testInsertBatch</h4> <p>To test the responsiveness of insertBatch()</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>void testInsertBatch(RowBatch rowBatch) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>The method name has been changed to testInsertTablet() in 0.10 version</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>void testInsertTablet(Tablet tablet) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><h3 id="new-interfaces"><a href="#new-interfaces" class="header-anchor">#</a> New Interfaces</h3> <div class="language- line-numbers-mode"><pre class="language-text"><code>void open(boolean enableRPCCompression) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>Open a session, with a parameter to specify whether to enable RPC compression. |
| Please pay attention that this RPC compression status of client must comply with the status of IoTDB server</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>void insertRecord(String deviceId, long time, List<String> measurements, |
| List<TSDataType> types, List<Object> values) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>Insert one record, in a way that user has to provide the type information of each measurement, which is different from the original insertRecord() interface. |
| The values should be provided in their primitive types. This interface is more proficient than the one without type parameters.</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>void insertRecords(List<String> deviceIds, List<Long> times, List<List<String>> measurementsList, |
| List<List<TSDataType>> typesList, List<List<Object>> valuesList) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>Insert multiple records with type parameters. This interface is more proficient than the one without type parameters.</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>void insertTablet(Tablet tablet, boolean sorted) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>An additional insertTablet() interface that providing a "sorted" parameter indicating if the tablet is in order. A sorted tablet may accelerate the insertion process.</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>void insertTablets(Map<String, Tablet> tablets) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>A new insertTablets() for inserting multiple tablets.</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>void insertTablets(Map<String, Tablet> tablets, boolean sorted) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>insertTablets() with an additional "sorted" parameter.</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>void testInsertRecord(String deviceId, long time, List<String> measurements, List<TSDataType> types, |
| List<Object> values) |
| void testInsertRecords(List<String> deviceIds, List<Long> times, List<List<String>> measurementsList, |
| List<List<TSDataType>> typesList, List<List<Object>> valuesList) |
| void testInsertTablet(Tablet tablet, boolean sorted) |
| void testInsertTablets(Map<String, Tablet> tablets) |
| void testInsertTablets(Map<String, Tablet> tablets, boolean sorted) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br></div></div><p>The above interfaces are newly added to test responsiveness of new insert interfaces.</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>void createTimeseries(String path, TSDataType dataType, TSEncoding encoding, CompressionType compressor, |
| Map<String, String> props, Map<String, String> tags, Map<String, String> attributes, |
| String measurementAlias) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><p>Create a timeseries with path, datatype, encoding and compression. Additionally, users can provide props, tags, attributes and measurementAlias。</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>void createMultiTimeseries(List<String> paths, List<TSDataType> dataTypes, List<TSEncoding> encodings, |
| List<CompressionType> compressors, List<Map<String, String>> propsList, |
| List<Map<String, String>> tagsList, List<Map<String, String>> attributesList, |
| List<String> measurementAliasList) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><p>Create multiple timeseries with a single method. Users can provide props, tags, attributes and measurementAlias as well for detailed timeseries information.</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>boolean checkTimeseriesExists(String path) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>Add a method to check whether the specific timeseries exists.</p></div> <div class="page-nav"><p class="inner"><span class="prev"> |
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