nebula-java's Introduction

nebula-java

This guide provides instructions and options for connecting Nebula Graph for Java developer.

Prerequisites

When developing with this Java driver, please use Java 8+. Depending on the version of Nebula Graph that you are connecting to, you will have to use a different version of this client.

Nebula version	Nebula Java version
rc4	1.0.0-rc4.20200323

Nebula Graph Java Driver

When using Maven, add dependency to your pom.xml file:

<dependency>
    <groupId>com.vesoft</groupId>
    <artifactId>client</artifactId>
    <version>1.0.0-rc4.20200323</version>
</dependency>

Change the ${VERSION} here. For more information about versions, please refer to releases.

Graph Client Example

Connect to the graphd:

GraphClient client = new GraphClientImpl("127.0.0.1", 3699);
client.connect("user", "password");

Use a space:

int code = client.switchSpace("space_test");

Execute a query:

int code = client.execute("CREATE TAG course(name string, credits int);");

If query executes successfully, 0 will be returned. For a more complete example, refer to Graph Java client example.

Storage Client

If you only use the interface of RPC, nothing to worry about.

If you want to directly use storage client to encode/decode, you need to use the jni interface. We have already package a libnebula_codec.so in the nebula-utils jar, but if it doesn't works in your environment, please compile the dynamic link library. And mvn install the jni jar in your local maven repo.

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