Merge pull request #5543 from influxdata/v3-java-reference-examples
feat(v3): Port Java client library examples to Dedicated and Clustered.pull/5552/head^2
Jason Stirnaman
GitHub
commit
37e0b8fc9c
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@ -3,7 +3,6 @@ title: Java client library for InfluxDB v3
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list_title: Java
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description: >
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The InfluxDB v3 `influxdb3-java` Java client library integrates with application code to write and query data stored in an InfluxDB Cloud Dedicated database.
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external_url: https://github.com/InfluxCommunity/influxdb3-java
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menu:
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influxdb_cloud_dedicated:
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name: Java
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@ -13,9 +12,350 @@ influxdb/cloud-dedicated/tags: [Flight client, Java, gRPC, SQL, Flight SQL, clie
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weight: 201
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---
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The InfluxDB v3 [`influxdb3-java` Java client library](https://github.com/InfluxCommunity/influxdb3-java) integrates with Java application code
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to write and query data stored in an {{% product-name %}} database.
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The InfluxDB v3 [`influxdb3-java` Java client library](https://github.com/InfluxCommunity/influxdb3-java) integrates
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with Java application code to write and query data stored in {{% product-name %}}.
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The documentation for this client library is available on GitHub.
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InfluxDB client libraries provide configurable batch writing of data to {{% product-name %}}.
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Use client libraries to construct line protocol data, transform data from other formats
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to line protocol, and batch write line protocol data to InfluxDB HTTP APIs.
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<a href="https://github.com/InfluxCommunity/influxdb3-java" target="_blank" class="btn github">InfluxDB v3 Java client library</a>
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InfluxDB v3 client libraries can query {{% product-name %}} using SQL or InfluxQL.
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The `influxdb3-java` Java client library wraps the Apache Arrow `org.apache.arrow.flight.FlightClient`
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in a convenient InfluxDB v3 interface for executing SQL and InfluxQL queries, requesting
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server metadata, and retrieving data from {{% product-name %}} using the Flight protocol with gRPC.
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- [Installation](#installation)
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- [Using Maven](#using-maven)
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- [Using Gradle](#using-gradle)
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- [Importing the client](#importing-the-client)
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- [API reference](#api-reference)
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- [Classes](#classes)
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- [InfluxDBClient interface](#influxdbclient-interface)
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- [Initialize with credential parameters](#initialize-with-credential-parameters)
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- [InfluxDBClient instance methods](#influxdbclient-instance-methods)
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- [InfluxDBClient.writePoint](#influxdbclientwritepoint)
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- [InfluxDBClient.query](#influxdbclientquery)
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#### Example: write and query data
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The following example shows how to use `influxdb3-java` to write and query data stored in {{% product-name %}}.
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{{% code-placeholders "DATABASE_NAME | DATABASE_TOKEN" %}}
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```java
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package com.influxdata.demo;
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import com.influxdb.v3.client.InfluxDBClient;
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import com.influxdb.v3.client.Point;
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import com.influxdb.v3.client.query.QueryOptions;
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import com.influxdb.v3.client.query.QueryType;
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import java.time.Instant;
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import java.util.stream.Stream;
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public class HelloInfluxDB {
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private static final String HOST_URL = "https://{{< influxdb/host >}}"; // your cluster URL
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private static final String DATABASE = "DATABASE_NAME"; // your InfluxDB database name
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private static final char[] TOKEN = System.getenv("DATABASE_TOKEN"); // a local environment variable that stores your database token
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// Create a client instance that writes and queries data in your database.
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public static void main(String[] args) {
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// Instantiate the client with your InfluxDB credentials
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try (InfluxDBClient client = InfluxDBClient.getInstance(HOST_URL, TOKEN, DATABASE)) {
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writeData(client);
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queryData(client);
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}
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catch (Exception e) {
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System.err.println("An error occurred while connecting to InfluxDB!");
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e.printStackTrace();
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}
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}
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// Use the Point class to construct time series data.
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private static void writeData(InfluxDBClient client) {
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Point point = Point.measurement("temperature")
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.setTag("location", "London")
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.setField("value", 30.01)
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.setTimestamp(Instant.now().minusSeconds(10));
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try {
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client.writePoint(point);
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System.out.println("Data is written to the database.");
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}
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catch (Exception e) {
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System.err.println("Failed to write data to the database.");
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e.printStackTrace();
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}
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}
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// Use SQL to query the most recent 10 measurements
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private static void queryData(InfluxDBClient client) {
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System.out.printf("--------------------------------------------------------%n");
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System.out.printf("| %-8s | %-8s | %-30s |%n", "location", "value", "time");
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System.out.printf("--------------------------------------------------------%n");
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String sql = "select time,location,value from temperature order by time desc limit 10";
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try (Stream<Object[]> stream = client.query(sql)) {
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stream.forEach(row -> System.out.printf("| %-8s | %-8s | %-30s |%n", row[1], row[2], row[0]));
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}
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catch (Exception e) {
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System.err.println("Failed to query data from the database.");
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e.printStackTrace();
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}
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}
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}
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```
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{{% cite %}}Source: [suyashcjoshi/SimpleJavaInfluxDB](https://github.com/suyashcjoshi/SimpleJavaInfluxDB/) on GitHub{{% /cite %}}
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{{% /code-placeholders %}}
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Replace the following:
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- {{% code-placeholder-key %}}`DATABASE_NAME`{{% /code-placeholder-key %}}:
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the name of your {{% product-name %}}
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[database](/influxdb/cloud-dedicated/admin/databases/) to read and write data to
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- {{% code-placeholder-key %}}`DATABASE_TOKEN`{{% /code-placeholder-key %}}: a
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local environment variable that stores your
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[token](/influxdb/cloud-dedicated/admin/tokens/database/)--the token must have
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read and write permissions on the specified database.
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### Run the example to write and query data
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1. Build an executable JAR for the project--for example, using Maven:
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<!--pytest.mark.skip-->
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```bash
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mvn package
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```
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2. In your terminal, run the `java` command to write and query data in your database:
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<!--pytest.mark.skip-->
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```bash
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java \
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--add-opens=java.base/java.nio=org.apache.arrow.memory.core,ALL-UNNAMED \
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-jar target/PROJECT_NAME.jar
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```
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Include the following in your command:
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- [`--add-opens=java.base/java.nio=org.apache.arrow.memory.core,ALL-UNNAMED`](https://arrow.apache.org/docs/java/install.html#id3): with Java version 9 or later and Apache Arrow version 16 or later, exposes JDK internals for Arrow.
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For more options, see the [Apache Arrow Java install documentation](https://arrow.apache.org/docs/java/install.html).
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- `-jar target/PROJECT_NAME.jar`: your `.jar` file to run.
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The output is the newly written data from your {{< product-name >}} database.
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## Installation
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Include `com.influxdb.influxdb3-java` in your project dependencies.
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{{< code-tabs-wrapper >}}
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{{% code-tabs %}}
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[Maven pom.xml](#)
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[Gradle dependency script](#)
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{{% /code-tabs %}}
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{{% code-tab-content %}}
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```xml
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<dependency>
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<groupId>com.influxdb</groupId>
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<artifactId>influxdb3-java</artifactId>
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<version>RELEASE</version>
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</dependency>
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```
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{{% /code-tab-content %}}
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{{% code-tab-content %}}
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<!--pytest.mark.skip-->
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```groovy
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dependencies {
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implementation group: 'com.influxdb', name: 'influxdb3-java', version: 'latest.release'
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}
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```
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{{% /code-tab-content %}}
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{{< /code-tabs-wrapper >}}
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## Importing the client
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The `influxdb3-java` client library package provides
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`com.influxdb.v3.client` classes for constructing, writing, and querying data
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stored in {{< product-name >}}.
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## API reference
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- [Interface InfluxDBClient](#interface-influxdbclient)
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- [Initialize with credential parameters](#initialize-with-credential-parameters)
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- [InfluxDBClient instance methods](#influxdbclient-instance-methods)
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- [InfluxDBClient.writePoint](#influxdbclientwritepoint)
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- [InfluxDBClient.query](#influxdbclientquery)
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## InfluxDBClient interface
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`InfluxDBClient` provides an interface for interacting with InfluxDB APIs for writing and querying data.
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The `InfluxDBClient.getInstance` constructor initializes and returns a client instance with the following:
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- A _write client_ configured for writing to the database.
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- An Arrow _Flight client_ configured for querying the database.
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To initialize a client, call `getInstance` and pass your credentials as one of
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the following types:
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- [parameters](#initialize-with-credential-parameters)
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- a [`ClientConfig`](https://github.com/InfluxCommunity/influxdb3-java/blob/main/src/main/java/com/influxdb/v3/client/config/ClientConfig.java)
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- a [database connection string](#initialize-using-a-database-connection-string)
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### Initialize with credential parameters
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{{% code-placeholders "host | database | token" %}}
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```java
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static InfluxDBClient getInstance(@Nonnull final String host,
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@Nullable final char[] token,
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@Nullable final String database)
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```
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{{% /code-placeholders %}}
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- {{% code-placeholder-key %}}`host`{{% /code-placeholder-key %}} (string): The host URL of the InfluxDB instance.
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- {{% code-placeholder-key %}}`database`{{% /code-placeholder-key %}} (string): The [database](/influxdb/cloud-dedicated/admin/databases/) to use for writing and querying.
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- {{% code-placeholder-key %}}`token`{{% /code-placeholder-key %}} (char array): A [database token](/influxdb/cloud-dedicated/admin/tokens/database/) with read/write permissions.
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#### Example: initialize with credential parameters
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{{% code-placeholders "DATABASE_NAME | DATABASE_TOKEN" %}}
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```java
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package com.influxdata.demo;
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import com.influxdb.v3.client.InfluxDBClient;
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import com.influxdb.v3.client.Point;
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import com.influxdb.v3.client.query.QueryOptions;
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import com.influxdb.v3.client.query.QueryType;
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import java.time.Instant;
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import java.util.stream.Stream;
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public class HelloInfluxDB {
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private static final String HOST_URL = "https://{{< influxdb/host >}}";
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private static final String DATABASE = "DATABASE_NAME";
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private static final char[] TOKEN = System.getenv("DATABASE_TOKEN");
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// Create a client instance, and then write and query data in InfluxDB.
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public static void main(String[] args) {
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try (InfluxDBClient client = InfluxDBClient.getInstance(HOST_URL, DATABASE_TOKEN, DATABASE)) {
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writeData(client);
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queryData(client);
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}
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catch (Exception e) {
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System.err.println("An error occurred while connecting to InfluxDB!");
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e.printStackTrace();
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}
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}
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}
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```
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{{% /code-placeholders %}}
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Replace the following:
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- {{% code-placeholder-key %}}`DATABASE_NAME`{{% /code-placeholder-key %}}:
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your {{% product-name %}} [database](/influxdb/cloud-dedicated/admin/databases/)
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- {{% code-placeholder-key %}}`DATABASE_TOKEN`{{% /code-placeholder-key %}}: a
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[database token](/influxdb/cloud-dedicated/admin/tokens/database/) that has
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the necessary permissions on the specified database.
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#### Default tags
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To include default [tags](/influxdb/cloud-dedicated/reference/glossary/#tag) in
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all written data, pass a `Map` of tag keys and values.
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```java
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InfluxDBClient getInstance(@Nonnull final String host,
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@Nullable final char[] token,
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@Nullable final String database,
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@Nullable Map<String, String> defaultTags)
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```
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### Initialize using a database connection string
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{{% code-placeholders "DATABASE_NAME | API_TOKEN" %}}
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```java
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"https://{{< influxdb/host >}}"
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+ "?token=DATABASE_TOKEN&database=DATABASE_NAME"
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```
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{{% /code-placeholders %}}
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Replace the following:
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- {{% code-placeholder-key %}}`DATABASE_NAME`{{% /code-placeholder-key %}}:
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your {{% product-name %}} [database](/influxdb/cloud-dedicated/admin/databases/)
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- {{% code-placeholder-key %}}`DATABASE_TOKEN`{{% /code-placeholder-key %}}: a
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[database token](/influxdb/cloud-dedicated/admin/tokens/database/) that has
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the necessary permissions on the specified database.
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### InfluxDBClient instance methods
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#### InfluxDBClient.writePoint
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To write points as line protocol to a database:
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1. [Initialize the `client`](#initialize-with-credential-parameters)--your
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token must have write permission on the specified database.
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2. Use the `com.influxdb.v3.client.Point` class to create time series data.
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3. Call the `client.writePoint()` method to write points as line protocol in your
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database.
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```java
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// Use the Point class to construct time series data.
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// Call client.writePoint to write the point in your database.
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private static void writeData(InfluxDBClient client) {
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Point point = Point.measurement("temperature")
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.setTag("location", "London")
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.setField("value", 30.01)
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.setTimestamp(Instant.now().minusSeconds(10));
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try {
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client.writePoint(point);
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System.out.println("Data written to the database.");
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}
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catch (Exception e) {
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System.err.println("Failed to write data to the database.");
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e.printStackTrace();
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}
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}
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```
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#### InfluxDBClient.query
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To query data and process the results:
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1. [Initialize the `client`](#initialize-with-credential-parameters)--the
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token must have read permission on the database you want to query.
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2. Call `client.query()` and provide your SQL query as a string.
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3. Use the result stream's built-in iterator to process row data.
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```java
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// Query the latest 10 measurements using SQL
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private static void queryData(InfluxDBClient client) {
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System.out.printf("--------------------------------------------------------%n");
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System.out.printf("| %-8s | %-8s | %-30s |%n", "location", "value", "time");
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System.out.printf("--------------------------------------------------------%n");
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String sql = "select time,location,value from temperature order by time desc limit 10";
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try (Stream<Object[]> stream = client.query(sql)) {
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stream.forEach(row -> System.out.printf("| %-8s | %-8s | %-30s |%n", row[1], row[2], row[0]));
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}
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catch (Exception e) {
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System.err.println("Failed to query data from the database.");
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e.printStackTrace();
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}
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}
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```
|
||||
|
||||
<a class="btn" href="https://github.com/InfluxCommunity/influxdb3-java/" target="\_blank">View the InfluxDB v3 Java client library</a>
|
||||
|
|
|
|||
|
|
@ -15,11 +15,10 @@ aliases:
|
|||
---
|
||||
|
||||
The InfluxDB v3 [`influxdb3-java` Java client library](https://github.com/InfluxCommunity/influxdb3-java) integrates
|
||||
with Java application code to write and query data stored in an {{% product-name %}}
|
||||
bucket.
|
||||
with Java application code to write and query data stored in {{% product-name %}}.
|
||||
|
||||
InfluxDB client libraries provide configurable batch writing of data to {{% product-name %}}.
|
||||
Client libraries can be used to construct line protocol data, transform data from other formats
|
||||
Use client libraries to construct line protocol data, transform data from other formats
|
||||
to line protocol, and batch write line protocol data to InfluxDB HTTP APIs.
|
||||
|
||||
InfluxDB v3 client libraries can query {{% product-name %}} using SQL or InfluxQL.
|
||||
|
|
@ -44,6 +43,8 @@ server metadata, and retrieving data from {{% product-name %}} using the Flight
|
|||
|
||||
The following example shows how to use `influxdb3-java` to write and query data stored in {{% product-name %}}.
|
||||
|
||||
{{% code-placeholders "DATABASE_NAME | API_TOKEN" %}}
|
||||
|
||||
```java
|
||||
package com.influxdata.demo;
|
||||
|
||||
|
|
@ -57,18 +58,18 @@ import java.util.stream.Stream;
|
|||
|
||||
public class HelloInfluxDB {
|
||||
private static final String HOST_URL = "https://{{< influxdb/host >}}"; // your Cloud Serverless region URL
|
||||
private static final String DATABASE = "java"; // your Cloud Serverless bucket
|
||||
private static final char[] API_TOKEN = System.getenv("API_TOKEN"); // your local environment variable that stores your API Token
|
||||
private static final String DATABASE = "DATABASE_NAME"; // your InfluxDB bucket
|
||||
private static final char[] TOKEN = System.getenv("API_TOKEN"); // a local environment variable that stores your API token
|
||||
|
||||
// Create a client instance that writes and queries data in your bucket.
|
||||
public static void main(String[] args) {
|
||||
// Instantiate the client with your InfluxDB credentials
|
||||
try (InfluxDBClient client = InfluxDBClient.getInstance(HOST_URL, API_TOKEN, DATABASE)) {
|
||||
try (InfluxDBClient client = InfluxDBClient.getInstance(HOST_URL, TOKEN, DATABASE)) {
|
||||
writeData(client);
|
||||
queryData(client);
|
||||
}
|
||||
catch (Exception e) {
|
||||
System.err.println("An error occurred while connecting to InfluxDB Cloud Serverless!");
|
||||
System.err.println("An error occurred while connecting to InfluxDB!");
|
||||
e.printStackTrace();
|
||||
}
|
||||
}
|
||||
|
|
@ -109,10 +110,17 @@ public class HelloInfluxDB {
|
|||
|
||||
{{% cite %}}Source: [suyashcjoshi/SimpleJavaInfluxDB](https://github.com/suyashcjoshi/SimpleJavaInfluxDB/) on GitHub{{% /cite %}}
|
||||
|
||||
{{% /code-placeholders %}}
|
||||
|
||||
Replace the following:
|
||||
|
||||
- {{% code-placeholder-key %}}`DATABASE_NAME`{{% /code-placeholder-key %}}: your {{% product-name %}} [bucket](/influxdb/cloud-serverless/admin/buckets/)
|
||||
- {{% code-placeholder-key %}}`API_TOKEN`{{% /code-placeholder-key %}}: a local environment variable that stores your [token](/influxdb/cloud-serverless/admin/tokens/)--the token must have read and write permission to the specified bucket.
|
||||
- {{% code-placeholder-key %}}`DATABASE_NAME`{{% /code-placeholder-key %}}:
|
||||
the name of your {{% product-name %}}
|
||||
[bucket](/influxdb/cloud-serverless/admin/buckets/) to read and write data to
|
||||
- {{% code-placeholder-key %}}`API_TOKEN`{{% /code-placeholder-key %}}: a local
|
||||
environment variable that stores your
|
||||
[token](/influxdb/cloud-serverless/admin/tokens/)--the token must have read
|
||||
and write permissions on the specified bucket.
|
||||
|
||||
### Run the example to write and query data
|
||||
|
||||
|
|
@ -193,35 +201,36 @@ stored in {{< product-name >}}.
|
|||
|
||||
The `InfluxDBClient.getInstance` constructor initializes and returns a client instance with the following:
|
||||
|
||||
- A _write client_ configured for writing to the database.
|
||||
- An Arrow _Flight client_ configured for querying the database.
|
||||
- A _write client_ configured for writing to the bucket.
|
||||
- An Arrow _Flight client_ configured for querying the bucket.
|
||||
|
||||
To initialize a client, call `getInstance` and pass your credentials as one of
|
||||
the following types:
|
||||
|
||||
- [parameters](#initialize-with-credential-parameters)
|
||||
- a [`ClientConfig`](https://github.com/InfluxCommunity/influxdb3-java/blob/main/src/main/java/com/influxdb/v3/client/config/ClientConfig.java)
|
||||
- a database connection string--for example:
|
||||
|
||||
```java
|
||||
"https://{{< influxdb/host >}}"
|
||||
+ "?token=API_TOKEN&database=DATABASE_NAME"
|
||||
```
|
||||
- a [database connection string](#initialize-using-a-database-connection-string)
|
||||
|
||||
### Initialize with credential parameters
|
||||
|
||||
{{% code-placeholders "host | database | token" %}}
|
||||
|
||||
```java
|
||||
static InfluxDBClient getInstance(@Nonnull final String host,
|
||||
@Nullable final char[] token,
|
||||
@Nullable final String database)
|
||||
```
|
||||
|
||||
- **`host`** (string): The host URL of the InfluxDB instance.
|
||||
- **`database`** (string): The bucket to use for writing and querying.
|
||||
- **`token`** (string): An API token with read/write permissions.
|
||||
{{% /code-placeholders %}}
|
||||
|
||||
- {{% code-placeholder-key %}}`host`{{% /code-placeholder-key %}} (string): The host URL of the InfluxDB instance.
|
||||
- {{% code-placeholder-key %}}`database`{{% /code-placeholder-key %}} (string): The [bucket](/influxdb/cloud-serverless/admin/buckets/) to use for writing and querying.
|
||||
- {{% code-placeholder-key %}}`token`{{% /code-placeholder-key %}} (char array): A [token](/influxdb/cloud-serverless/admin/tokens/) with read/write permissions.
|
||||
|
||||
#### Example: initialize with credential parameters
|
||||
|
||||
{{% code-placeholders "DATABASE_NAME | API_TOKEN" %}}
|
||||
|
||||
```java
|
||||
package com.influxdata.demo;
|
||||
|
||||
|
|
@ -235,9 +244,10 @@ import java.util.stream.Stream;
|
|||
|
||||
public class HelloInfluxDB {
|
||||
private static final String HOST_URL = "https://{{< influxdb/host >}}";
|
||||
private static final String DATABASE = "DATABASE_NAME"; // your Cloud Serverless bucket
|
||||
private static final char[] API_TOKEN = System.getenv("API_TOKEN"); // an environment variable for your Cloud Serverless API Token
|
||||
// Create a client instance, and then write and query data in InfluxDB Cloud Serverless.
|
||||
private static final String DATABASE = "DATABASE_NAME";
|
||||
private static final char[] API_TOKEN = System.getenv("API_TOKEN");
|
||||
|
||||
// Create a client instance, and then write and query data in InfluxDB.
|
||||
public static void main(String[] args) {
|
||||
try (InfluxDBClient client = InfluxDBClient.getInstance(HOST_URL, API_TOKEN, DATABASE)) {
|
||||
writeData(client);
|
||||
|
|
@ -251,25 +261,58 @@ public class HelloInfluxDB {
|
|||
}
|
||||
```
|
||||
|
||||
{{% /code-placeholders %}}
|
||||
|
||||
Replace the following:
|
||||
|
||||
- {{% code-placeholder-key %}}`DATABASE_NAME`{{% /code-placeholder-key %}}:
|
||||
your {{% product-name %}} [bucket](/influxdb/cloud-serverless/admin/buckets/)
|
||||
- {{% code-placeholder-key %}}`API_TOKEN`{{% /code-placeholder-key %}}: a local
|
||||
environment variable that stores your
|
||||
[token](/influxdb/cloud-serverless/admin/tokens/)--the token must have the
|
||||
necessary permissions on the specified bucket.
|
||||
|
||||
#### Default tags
|
||||
|
||||
- _Optional_: To include default
|
||||
[tags](/influxdb/cloud-serverless/reference/glossary/#tag) in all written data,
|
||||
pass a `Map` of tag keys and values.
|
||||
To include default [tags](/influxdb/cloud-serverless/reference/glossary/#tag) in
|
||||
all written data, pass a `Map` of tag keys and values.
|
||||
|
||||
```java
|
||||
InfluxDBClient getInstance(@Nonnull final String host,
|
||||
@Nullable final char[] token,
|
||||
@Nullable final String database,
|
||||
@Nullable Map<String, String> defaultTags)
|
||||
```
|
||||
```java
|
||||
InfluxDBClient getInstance(@Nonnull final String host,
|
||||
@Nullable final char[] token,
|
||||
@Nullable final String database,
|
||||
@Nullable Map<String, String> defaultTags)
|
||||
```
|
||||
|
||||
### Initialize using a database connection string
|
||||
|
||||
{{% code-placeholders "DATABASE_NAME | API_TOKEN" %}}
|
||||
|
||||
```java
|
||||
"https://{{< influxdb/host >}}"
|
||||
+ "?token=API_TOKEN&database=DATABASE_NAME"
|
||||
```
|
||||
|
||||
{{% /code-placeholders %}}
|
||||
|
||||
Replace the following:
|
||||
|
||||
- {{% code-placeholder-key %}}`DATABASE_NAME`{{% /code-placeholder-key %}}:
|
||||
your {{% product-name %}} [bucket](/influxdb/cloud-serverless/admin/buckets/)
|
||||
- {{% code-placeholder-key %}}`API_TOKEN`{{% /code-placeholder-key %}}: a
|
||||
[token](/influxdb/cloud-serverless/admin/tokens/) that has the
|
||||
necessary permissions on the specified bucket.
|
||||
|
||||
### InfluxDBClient instance methods
|
||||
|
||||
#### InfluxDBClient.writePoint
|
||||
|
||||
1. Use the `com.influxdb.v3.client.Point` class to create time series data.
|
||||
2. Call the `client.writePoint()` method to write points as line protocol in your
|
||||
To write points as line protocol to a bucket:
|
||||
|
||||
1. [Initialize the `client`](#initialize-with-credential-parameters)--your
|
||||
token must have write permission on the specified bucket.
|
||||
2. Use the `com.influxdb.v3.client.Point` class to create time series data.
|
||||
3. Call the `client.writePoint()` method to write points as line protocol in your
|
||||
bucket.
|
||||
|
||||
```java
|
||||
|
|
@ -295,8 +338,10 @@ public class HelloInfluxDB {
|
|||
|
||||
To query data and process the results:
|
||||
|
||||
1. Call `client.query()` and provide your SQL query as a string.
|
||||
2. Use the result stream's built-in iterator to process row data.
|
||||
1. [Initialize the `client`](#initialize-with-credential-parameters)--your
|
||||
token must have read permission on the bucket you want to query.
|
||||
2. Call `client.query()` and provide your SQL query as a string.
|
||||
3. Use the result stream's built-in iterator to process row data.
|
||||
|
||||
```java
|
||||
// Query the latest 10 measurements using SQL
|
||||
|
|
@ -316,4 +361,4 @@ To query data and process the results:
|
|||
}
|
||||
```
|
||||
|
||||
<a class="btn" href="https://github.com/InfluxCommunity/influxdb3-java/" target="\_blank">View the InfluxDB v3 Java client library</a>
|
||||
<a class="btn" href="https://github.com/InfluxCommunity/influxdb3-java/" target="\_blank">View the InfluxDB v3 Java client library</a>
|
||||
|
|
|
|||
|
|
@ -13,9 +13,350 @@ influxdb/clustered/tags: [Flight client, Java, gRPC, SQL, Flight SQL, client lib
|
|||
weight: 201
|
||||
---
|
||||
|
||||
The InfluxDB v3 [`influxdb3-java` Java client library](https://github.com/InfluxCommunity/influxdb3-java) integrates with Java application code
|
||||
to write and query data stored in an {{% product-name %}} database.
|
||||
The InfluxDB v3 [`influxdb3-java` Java client library](https://github.com/InfluxCommunity/influxdb3-java) integrates
|
||||
with Java application code to write and query data stored in {{% product-name %}}.
|
||||
|
||||
The documentation for this client library is available on GitHub.
|
||||
InfluxDB client libraries provide configurable batch writing of data to {{% product-name %}}.
|
||||
Use client libraries to construct line protocol data, transform data from other formats
|
||||
to line protocol, and batch write line protocol data to InfluxDB HTTP APIs.
|
||||
|
||||
<a href="https://github.com/InfluxCommunity/influxdb3-java" target="_blank" class="btn github">InfluxDB v3 Java client library</a>
|
||||
InfluxDB v3 client libraries can query {{% product-name %}} using SQL or InfluxQL.
|
||||
The `influxdb3-java` Java client library wraps the Apache Arrow `org.apache.arrow.flight.FlightClient`
|
||||
in a convenient InfluxDB v3 interface for executing SQL and InfluxQL queries, requesting
|
||||
server metadata, and retrieving data from {{% product-name %}} using the Flight protocol with gRPC.
|
||||
|
||||
- [Installation](#installation)
|
||||
- [Using Maven](#using-maven)
|
||||
- [Using Gradle](#using-gradle)
|
||||
- [Importing the client](#importing-the-client)
|
||||
- [API reference](#api-reference)
|
||||
- [Classes](#classes)
|
||||
- [InfluxDBClient interface](#influxdbclient-interface)
|
||||
- [Initialize with credential parameters](#initialize-with-credential-parameters)
|
||||
- [InfluxDBClient instance methods](#influxdbclient-instance-methods)
|
||||
- [InfluxDBClient.writePoint](#influxdbclientwritepoint)
|
||||
- [InfluxDBClient.query](#influxdbclientquery)
|
||||
|
||||
|
||||
#### Example: write and query data
|
||||
|
||||
The following example shows how to use `influxdb3-java` to write and query data stored in {{% product-name %}}.
|
||||
|
||||
{{% code-placeholders "DATABASE_NAME | DATABASE_TOKEN" %}}
|
||||
|
||||
```java
|
||||
package com.influxdata.demo;
|
||||
|
||||
import com.influxdb.v3.client.InfluxDBClient;
|
||||
import com.influxdb.v3.client.Point;
|
||||
import com.influxdb.v3.client.query.QueryOptions;
|
||||
import com.influxdb.v3.client.query.QueryType;
|
||||
|
||||
import java.time.Instant;
|
||||
import java.util.stream.Stream;
|
||||
|
||||
public class HelloInfluxDB {
|
||||
private static final String HOST_URL = "https://{{< influxdb/host >}}"; // your cluster URL
|
||||
private static final String DATABASE = "DATABASE_NAME"; // your InfluxDB database name
|
||||
private static final char[] TOKEN = System.getenv("DATABASE_TOKEN"); // a local environment variable that stores your database token
|
||||
|
||||
// Create a client instance that writes and queries data in your database.
|
||||
public static void main(String[] args) {
|
||||
// Instantiate the client with your InfluxDB credentials
|
||||
try (InfluxDBClient client = InfluxDBClient.getInstance(HOST_URL, TOKEN, DATABASE)) {
|
||||
writeData(client);
|
||||
queryData(client);
|
||||
}
|
||||
catch (Exception e) {
|
||||
System.err.println("An error occurred while connecting to InfluxDB!");
|
||||
e.printStackTrace();
|
||||
}
|
||||
}
|
||||
|
||||
// Use the Point class to construct time series data.
|
||||
private static void writeData(InfluxDBClient client) {
|
||||
Point point = Point.measurement("temperature")
|
||||
.setTag("location", "London")
|
||||
.setField("value", 30.01)
|
||||
.setTimestamp(Instant.now().minusSeconds(10));
|
||||
try {
|
||||
client.writePoint(point);
|
||||
System.out.println("Data is written to the database.");
|
||||
}
|
||||
catch (Exception e) {
|
||||
System.err.println("Failed to write data to the database.");
|
||||
e.printStackTrace();
|
||||
}
|
||||
}
|
||||
|
||||
// Use SQL to query the most recent 10 measurements
|
||||
private static void queryData(InfluxDBClient client) {
|
||||
System.out.printf("--------------------------------------------------------%n");
|
||||
System.out.printf("| %-8s | %-8s | %-30s |%n", "location", "value", "time");
|
||||
System.out.printf("--------------------------------------------------------%n");
|
||||
|
||||
String sql = "select time,location,value from temperature order by time desc limit 10";
|
||||
try (Stream<Object[]> stream = client.query(sql)) {
|
||||
stream.forEach(row -> System.out.printf("| %-8s | %-8s | %-30s |%n", row[1], row[2], row[0]));
|
||||
}
|
||||
catch (Exception e) {
|
||||
System.err.println("Failed to query data from the database.");
|
||||
e.printStackTrace();
|
||||
}
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
{{% cite %}}Source: [suyashcjoshi/SimpleJavaInfluxDB](https://github.com/suyashcjoshi/SimpleJavaInfluxDB/) on GitHub{{% /cite %}}
|
||||
|
||||
{{% /code-placeholders %}}
|
||||
|
||||
Replace the following:
|
||||
|
||||
- {{% code-placeholder-key %}}`DATABASE_NAME`{{% /code-placeholder-key %}}:
|
||||
the name of your {{% product-name %}}
|
||||
[database](/influxdb/clustered/admin/databases/) to read and write data to
|
||||
- {{% code-placeholder-key %}}`DATABASE_TOKEN`{{% /code-placeholder-key %}}: a
|
||||
local environment variable that stores your
|
||||
[token](/influxdb/clustered/admin/tokens/database/)--the token must have
|
||||
read and write permissions on the specified database.
|
||||
|
||||
### Run the example to write and query data
|
||||
|
||||
1. Build an executable JAR for the project--for example, using Maven:
|
||||
|
||||
<!--pytest.mark.skip-->
|
||||
|
||||
```bash
|
||||
mvn package
|
||||
```
|
||||
|
||||
2. In your terminal, run the `java` command to write and query data in your database:
|
||||
|
||||
<!--pytest.mark.skip-->
|
||||
|
||||
```bash
|
||||
java \
|
||||
--add-opens=java.base/java.nio=org.apache.arrow.memory.core,ALL-UNNAMED \
|
||||
-jar target/PROJECT_NAME.jar
|
||||
```
|
||||
|
||||
Include the following in your command:
|
||||
|
||||
- [`--add-opens=java.base/java.nio=org.apache.arrow.memory.core,ALL-UNNAMED`](https://arrow.apache.org/docs/java/install.html#id3): with Java version 9 or later and Apache Arrow version 16 or later, exposes JDK internals for Arrow.
|
||||
For more options, see the [Apache Arrow Java install documentation](https://arrow.apache.org/docs/java/install.html).
|
||||
- `-jar target/PROJECT_NAME.jar`: your `.jar` file to run.
|
||||
|
||||
The output is the newly written data from your {{< product-name >}} database.
|
||||
|
||||
## Installation
|
||||
|
||||
Include `com.influxdb.influxdb3-java` in your project dependencies.
|
||||
|
||||
{{< code-tabs-wrapper >}}
|
||||
{{% code-tabs %}}
|
||||
[Maven pom.xml](#)
|
||||
[Gradle dependency script](#)
|
||||
{{% /code-tabs %}}
|
||||
{{% code-tab-content %}}
|
||||
```xml
|
||||
<dependency>
|
||||
<groupId>com.influxdb</groupId>
|
||||
<artifactId>influxdb3-java</artifactId>
|
||||
<version>RELEASE</version>
|
||||
</dependency>
|
||||
```
|
||||
{{% /code-tab-content %}}
|
||||
{{% code-tab-content %}}
|
||||
<!--pytest.mark.skip-->
|
||||
```groovy
|
||||
dependencies {
|
||||
|
||||
implementation group: 'com.influxdb', name: 'influxdb3-java', version: 'latest.release'
|
||||
|
||||
}
|
||||
```
|
||||
{{% /code-tab-content %}}
|
||||
{{< /code-tabs-wrapper >}}
|
||||
|
||||
## Importing the client
|
||||
|
||||
The `influxdb3-java` client library package provides
|
||||
`com.influxdb.v3.client` classes for constructing, writing, and querying data
|
||||
stored in {{< product-name >}}.
|
||||
|
||||
## API reference
|
||||
|
||||
- [Interface InfluxDBClient](#interface-influxdbclient)
|
||||
- [Initialize with credential parameters](#initialize-with-credential-parameters)
|
||||
- [InfluxDBClient instance methods](#influxdbclient-instance-methods)
|
||||
- [InfluxDBClient.writePoint](#influxdbclientwritepoint)
|
||||
- [InfluxDBClient.query](#influxdbclientquery)
|
||||
|
||||
|
||||
## InfluxDBClient interface
|
||||
|
||||
`InfluxDBClient` provides an interface for interacting with InfluxDB APIs for writing and querying data.
|
||||
|
||||
The `InfluxDBClient.getInstance` constructor initializes and returns a client instance with the following:
|
||||
|
||||
- A _write client_ configured for writing to the database.
|
||||
- An Arrow _Flight client_ configured for querying the database.
|
||||
|
||||
To initialize a client, call `getInstance` and pass your credentials as one of
|
||||
the following types:
|
||||
|
||||
- [parameters](#initialize-with-credential-parameters)
|
||||
- a [`ClientConfig`](https://github.com/InfluxCommunity/influxdb3-java/blob/main/src/main/java/com/influxdb/v3/client/config/ClientConfig.java)
|
||||
- a [database connection string](#initialize-using-a-database-connection-string)
|
||||
|
||||
### Initialize with credential parameters
|
||||
|
||||
{{% code-placeholders "host | database | token" %}}
|
||||
|
||||
```java
|
||||
static InfluxDBClient getInstance(@Nonnull final String host,
|
||||
@Nullable final char[] token,
|
||||
@Nullable final String database)
|
||||
```
|
||||
|
||||
{{% /code-placeholders %}}
|
||||
|
||||
- {{% code-placeholder-key %}}`host`{{% /code-placeholder-key %}} (string): The host URL of the InfluxDB instance.
|
||||
- {{% code-placeholder-key %}}`database`{{% /code-placeholder-key %}} (string): The [database](/influxdb/clustered/admin/databases/) to use for writing and querying.
|
||||
- {{% code-placeholder-key %}}`token`{{% /code-placeholder-key %}} (char array): A [database token](/influxdb/clustered/admin/tokens/database/) with read/write permissions.
|
||||
|
||||
#### Example: initialize with credential parameters
|
||||
|
||||
{{% code-placeholders "DATABASE_NAME | DATABASE_TOKEN" %}}
|
||||
|
||||
```java
|
||||
package com.influxdata.demo;
|
||||
|
||||
import com.influxdb.v3.client.InfluxDBClient;
|
||||
import com.influxdb.v3.client.Point;
|
||||
import com.influxdb.v3.client.query.QueryOptions;
|
||||
import com.influxdb.v3.client.query.QueryType;
|
||||
|
||||
import java.time.Instant;
|
||||
import java.util.stream.Stream;
|
||||
|
||||
public class HelloInfluxDB {
|
||||
private static final String HOST_URL = "https://{{< influxdb/host >}}";
|
||||
private static final String DATABASE = "DATABASE_NAME";
|
||||
private static final char[] TOKEN = System.getenv("DATABASE_TOKEN");
|
||||
|
||||
// Create a client instance, and then write and query data in InfluxDB.
|
||||
public static void main(String[] args) {
|
||||
try (InfluxDBClient client = InfluxDBClient.getInstance(HOST_URL, DATABASE_TOKEN, DATABASE)) {
|
||||
writeData(client);
|
||||
queryData(client);
|
||||
}
|
||||
catch (Exception e) {
|
||||
System.err.println("An error occurred while connecting to InfluxDB!");
|
||||
e.printStackTrace();
|
||||
}
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
{{% /code-placeholders %}}
|
||||
|
||||
Replace the following:
|
||||
|
||||
- {{% code-placeholder-key %}}`DATABASE_NAME`{{% /code-placeholder-key %}}:
|
||||
your {{% product-name %}} [database](/influxdb/clustered/admin/databases/)
|
||||
- {{% code-placeholder-key %}}`DATABASE_TOKEN`{{% /code-placeholder-key %}}: a
|
||||
[database token](/influxdb/clustered/admin/tokens/database/) that has
|
||||
the necessary permissions on the specified database.
|
||||
|
||||
#### Default tags
|
||||
|
||||
To include default [tags](/influxdb/clustered/reference/glossary/#tag) in
|
||||
all written data, pass a `Map` of tag keys and values.
|
||||
|
||||
```java
|
||||
InfluxDBClient getInstance(@Nonnull final String host,
|
||||
@Nullable final char[] token,
|
||||
@Nullable final String database,
|
||||
@Nullable Map<String, String> defaultTags)
|
||||
```
|
||||
|
||||
### Initialize using a database connection string
|
||||
|
||||
{{% code-placeholders "DATABASE_NAME | API_TOKEN" %}}
|
||||
|
||||
```java
|
||||
"https://{{< influxdb/host >}}"
|
||||
+ "?token=DATABASE_TOKEN&database=DATABASE_NAME"
|
||||
```
|
||||
|
||||
{{% /code-placeholders %}}
|
||||
|
||||
Replace the following:
|
||||
|
||||
- {{% code-placeholder-key %}}`DATABASE_NAME`{{% /code-placeholder-key %}}:
|
||||
your {{% product-name %}} [database](/influxdb/clustered/admin/databases/)
|
||||
- {{% code-placeholder-key %}}`DATABASE_TOKEN`{{% /code-placeholder-key %}}: a
|
||||
[database token](/influxdb/clustered/admin/tokens/database/) that has
|
||||
the necessary permissions on the specified database.
|
||||
|
||||
### InfluxDBClient instance methods
|
||||
|
||||
#### InfluxDBClient.writePoint
|
||||
|
||||
To write points as line protocol to a database:
|
||||
|
||||
1. [Initialize the `client`](#initialize-with-credential-parameters)--your
|
||||
token must have write permission on the specified database.
|
||||
2. Use the `com.influxdb.v3.client.Point` class to create time series data.
|
||||
3. Call the `client.writePoint()` method to write points as line protocol in your
|
||||
database.
|
||||
|
||||
```java
|
||||
// Use the Point class to construct time series data.
|
||||
// Call client.writePoint to write the point in your database.
|
||||
private static void writeData(InfluxDBClient client) {
|
||||
Point point = Point.measurement("temperature")
|
||||
.setTag("location", "London")
|
||||
.setField("value", 30.01)
|
||||
.setTimestamp(Instant.now().minusSeconds(10));
|
||||
try {
|
||||
client.writePoint(point);
|
||||
System.out.println("Data written to the database.");
|
||||
}
|
||||
catch (Exception e) {
|
||||
System.err.println("Failed to write data to the database.");
|
||||
e.printStackTrace();
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
#### InfluxDBClient.query
|
||||
|
||||
To query data and process the results:
|
||||
|
||||
1. [Initialize the `client`](#initialize-with-credential-parameters)--the
|
||||
token must have read permission on the database you want to query.
|
||||
2. Call `client.query()` and provide your SQL query as a string.
|
||||
3. Use the result stream's built-in iterator to process row data.
|
||||
|
||||
```java
|
||||
// Query the latest 10 measurements using SQL
|
||||
private static void queryData(InfluxDBClient client) {
|
||||
System.out.printf("--------------------------------------------------------%n");
|
||||
System.out.printf("| %-8s | %-8s | %-30s |%n", "location", "value", "time");
|
||||
System.out.printf("--------------------------------------------------------%n");
|
||||
|
||||
String sql = "select time,location,value from temperature order by time desc limit 10";
|
||||
try (Stream<Object[]> stream = client.query(sql)) {
|
||||
stream.forEach(row -> System.out.printf("| %-8s | %-8s | %-30s |%n", row[1], row[2], row[0]));
|
||||
}
|
||||
catch (Exception e) {
|
||||
System.err.println("Failed to query data from the database.");
|
||||
e.printStackTrace();
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
<a class="btn" href="https://github.com/InfluxCommunity/influxdb3-java/" target="\_blank">View the InfluxDB v3 Java client library</a>
|
||||
|
|
|
|||
Loading…
Reference in New Issue