一个可靠的分布式、线性扩容、
性能高效的图数据库

#include <atomic>
#include <chrono>
#include <thread>

#include <nebula/client/Config.h>
#include <nebula/client/ConnectionPool.h>
#include <common/Init.h>

int main(int argc, char* argv[]) {
    nebula::init(&argc, &argv);
    auto address = "127.0.0.1:9669";
    if (argc == 2) {
        address = argv[1];
    }
    std::cout << "Current address: " << address << std::endl;
    nebula::ConnectionPool pool;
    pool.init({address}, nebula::Config{});
    auto session = pool.getSession("root", "nebula");
    if (!session.valid()) {
        return -1;
    }

    auto result = session.execute("SHOW HOSTS");
    if (result.errorCode != nebula::ErrorCode::SUCCEEDED) {
        std::cout << "Exit with error code: " << static_cast<int>(result.errorCode) << std::endl;
        return static_cast<int>(result.errorCode);
    }
    std::cout << *result.data;

    std::atomic_bool complete{false};
    session.asyncExecute("SHOW HOSTS", [&complete](nebula::ExecutionResponse&& cbResult) {
        if (cbResult.errorCode != nebula::ErrorCode::SUCCEEDED) {
            std::cout << "Exit with error code: " << static_cast<int>(cbResult.errorCode)
                      << std::endl;
            std::exit(static_cast<int>(cbResult.errorCode));
        }
        std::cout << *cbResult.data;
        complete.store(true);
    });

    while (!complete.load()) {
        std::this_thread::sleep_for(std::chrono::seconds(1));
    }

    session.release();
    return 0;
}

import (
	"fmt"

	nebula "github.com/vesoft-inc/nebula-go/v3"
)

const (
	address = "127.0.0.1"
	// The default port of NebulaGraph 2.x is 9669.
	// 3699 is only for testing.
	port     = 3699
	username = "root"
	password = "nebula"
)

// Initialize logger
var log = nebula.DefaultLogger{}

func main() {
	hostAddress := nebula.HostAddress{Host: address, Port: port}
	hostList := []nebula.HostAddress{hostAddress}
	// Create configs for connection pool using default values
	testPoolConfig := nebula.GetDefaultConf()

	// Initialize connection pool
	pool, err := nebula.NewConnectionPool(hostList, testPoolConfig, log)
	if err != nil {
		log.Fatal(fmt.Sprintf("Fail to initialize the connection pool, host: %s, port: %d, %s", address, port, err.Error()))
	}
	// Close all connections in the pool
	defer pool.Close()

	// Create session
	session, err := pool.GetSession(username, password)
	if err != nil {
		log.Fatal(fmt.Sprintf("Fail to create a new session from connection pool, username: %s, password: %s, %s",
			username, password, err.Error()))
	}
	// Release session and return connection back to connection pool
	defer session.Release()

	checkResultSet := func(prefix string, res *nebula.ResultSet) {
		if !res.IsSucceed() {
			log.Fatal(fmt.Sprintf("%s, ErrorCode: %v, ErrorMsg: %s", prefix, res.GetErrorCode(), res.GetErrorMsg()))
		}
	}

	{
		// Prepare the query
		createSchema := "CREATE SPACE IF NOT EXISTS basic_example_space(vid_type=FIXED_STRING(20)); " +
			"USE basic_example_space;" +
			"CREATE TAG IF NOT EXISTS person(name string, age int);" +
			"CREATE EDGE IF NOT EXISTS like(likeness double)"

		// Excute a query
		resultSet, err := session.Execute(createSchema)
		if err != nil {
			fmt.Print(err.Error())
			return
		}
		checkResultSet(createSchema, resultSet)
	}
	// Drop space
	{
		query := "DROP SPACE IF EXISTS basic_example_space"
		// Send query
		resultSet, err := session.Execute(query)
		if err != nil {
			fmt.Print(err.Error())
			return
		}
		checkResultSet(query, resultSet)
	}

	fmt.Print("
")
	log.Info("Nebula Go Client Basic Example Finished")
}

NebulaPoolConfig nebulaPoolConfig = new NebulaPoolConfig();
nebulaPoolConfig.setMaxConnSize(10);
List<HostAddress> addresses = Arrays.asList(new HostAddress("127.0.0.1", 9669),
        new HostAddress("127.0.0.1", 9670));
NebulaPool pool = new NebulaPool();
pool.init(addresses, nebulaPoolConfig);
Session session = pool.getSession("root", "nebula", false);
session.execute("SHOW HOSTS;");
session.release();
pool.close();

from nebula3.gclient.net import ConnectionPool
from nebula3.Config import Config

# define a config
config = Config()
config.max_connection_pool_size = 10
# init connection pool
connection_pool = ConnectionPool()
# if the given servers are ok, return true, else return false
ok = connection_pool.init([('127.0.0.1', 9669)], config)

# option 1 control the connection release yourself
# get session from the pool
session = connection_pool.get_session('root', 'nebula')

# select space
session.execute('USE nba')

# show tags
result = session.execute('SHOW TAGS')
print(result)

# release session
session.release()

# option 2 with session_context, session will be released automatically
with connection_pool.session_context('root', 'nebula') as session:
    session.execute('USE nba')
    result = session.execute('SHOW TAGS')
    print(result)

# close the pool
connection_pool.close()

// ESM
import { createClient } from '@nebula-contrib/nebula-nodejs'

// CommonJS
// const { createClient } = require('@nebula-contrib/nebula-nodejs')

// Connection Options
const options = {
  servers: ['ip-1:port','ip-2:port'],
  userName: 'xxx',
  password: 'xxx',
  space: 'space name',
  poolSize: 5,
  bufferSize: 2000,
  executeTimeout: 15000,
  pingInterval: 60000
}

// Create client
const client = createClient(options)

// Execute command
// 1. return parsed data (recommend)
const response = await client.execute('GET SUBGRAPH 3 STEPS FROM -7897618527020261406')
// 2. return nebula original data
const responseOriginal = await client.execute('GET SUBGRAPH 3 STEPS FROM -7897618527020261406', true)