1. 简介

Neo4j is a highly scalable, robust native graph database.

Neo4j Sample Datasets

2. 启动测试

启动neo4j

docker run \
    --publish=7474:7474 --publish=7687:7687 \
    --volume=$HOME/neo4j/data:/data \
    neo4j

测试

地址：http://localhost:7474
账号：neo4j
密码：neo4j
点击Jump into code，完成入门学习

hello neo4j

3. Neo4j Desktop

一个Neo4j Instance，在同一时间只能激活一个Graph，不过，我们可以启动多个Instance。
通过Neo4j Desktop可以创建Local Instance，也可以管理多个Instance，包含Local和Remote。

Neo4j Desktop

Neo4j Desktop
Neo4j Desktop Management for Local Instance

Neo4j Desktop Management for Local Instance
Neo4j Browser

Neo4j Browser

4. Neo4j Client

Neo4j Client (CLI and library)
https://neo4j-client.net/
https://github.com/cleishm/libneo4j-client

$ sudo add-apt-repository ppa:cleishm/neo4j
$ sudo apt-get update
$ sudo apt-get install neo4j-client libneo4j-client-dev

Neo4j Client

Neo4j Client
Neo4j for C Language

#include <neo4j-client.h>
#include <errno.h>
#include <stdio.h>

int main(int argc, char *argv[])
{
    neo4j_client_init();

    /* use NEO4J_INSECURE when connecting to disable TLS */
    neo4j_connection_t *connection =
            neo4j_connect("neo4j://user:pass@localhost:7687", NULL, NEO4J_INSECURE);
    if (connection == NULL)
    {
        neo4j_perror(stderr, errno, "Connection failed");
        return EXIT_FAILURE;
    }

    neo4j_result_stream_t *results =
            neo4j_run(connection, "RETURN 'hello world'", neo4j_null);
    if (results == NULL)
    {
        neo4j_perror(stderr, errno, "Failed to run statement");
        return EXIT_FAILURE;
    }

    neo4j_result_t *result = neo4j_fetch_next(results);
    if (result == NULL)
    {
        neo4j_perror(stderr, errno, "Failed to fetch result");
        return EXIT_FAILURE;
    }

    neo4j_value_t value = neo4j_result_field(result, 0);
    char buf[128];
    printf("%s\n", neo4j_tostring(value, buf, sizeof(buf)));

    neo4j_close_results(results);
    neo4j_close(connection);
    neo4j_client_cleanup();
    return EXIT_SUCCESS;
}

5. Neo4j for Python

install package

$ pip3.6 install neo4j

hello.py

from neo4j.v1 import GraphDatabase

neo4j_uri = "bolt://localhost:7687"
auth_user = 'neo4j'
auth_psd = 'root'


class HelloWorldExample(object):

    def __init__(self, uri, user, password):
        self._driver = GraphDatabase.driver(uri, auth=(user, password))

    def close(self):
        self._driver.close()

    def print_greeting(self, message):
        with self._driver.session() as session:
            greeting = session.write_transaction(self._create_and_return_greeting, message)
            print(greeting)
            # session.run()

    @staticmethod
    def _create_and_return_greeting(tx, message):
        result = tx.run("CREATE (a:Greeting) "
                        "SET a.message = $message "
                        "RETURN a.message + ', from node ' + id(a)", message=message)
        return result.single()[0]


if __name__ == '__main__':
    print('run in main...')
    example = HelloWorldExample(neo4j_uri, auth_user, auth_psd)
    example.print_greeting('Hello Neo4j')
    example.close()

run hello.py

$ python3.6 hello.py
run in main...
Hello Neo4j, from node 179

6. Reference

neo4j desktop appimage for ubuntu
链接: https://pan.baidu.com/s/1XCSwTT4XEPWGNM8yF_tAcg
提取码: 9xnb
neo4j official book
链接: https://pan.baidu.com/s/1oepXhDTQ_L95_wps-gTyCQ
提取码: tcu9
neo4j operations manual
https://neo4j.com/docs/operations-manual/current/introduction/
neo4j docker image
https://hub.docker.com/_/neo4j?tab=description

Neo4j - 入门学习