neo4j - 交互

python-api

https://neo4j.com/developer/language-guides/#bolt-python

pip install neo4j-driver

from neo4j.v1 import GraphDatabase

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)

    @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]

Java-api

https://neo4j.com/developer/language-guides/#bolt-java

Neo4j可以以两种方式运行：

Java应用程序中的嵌入式数据库
通过REST的独立服务器

maven配置

   <repository>
        <id>neo4j</id>
        <url>http://m2.neo4j.org/content/repositories/releases/</url>
        <releases>
            <enabled>true</enabled>
        </releases>
   </repository>
 ... 
    
   <dependency>
    <!-- 服务器开发需要的jar包 -->
      <groupId>org.neo4j.driver</groupId>
      <artifactId>neo4j-java-driver</artifactId>
      <version>1.5.0</version>
    </dependency>
    <dependency>
    <!-- 嵌入式开发需要的jar包 -->
        <groupId>org.neo4j</groupId>
        <artifactId>neo4j</artifactId>
        <version>3.3.4</version>
     </dependency>

import org.neo4j.driver.v1.AuthTokens;
import org.neo4j.driver.v1.Driver;
import org.neo4j.driver.v1.GraphDatabase;
import org.neo4j.driver.v1.Session;
import org.neo4j.driver.v1.StatementResult;
import org.neo4j.driver.v1.Transaction;
import org.neo4j.driver.v1.TransactionWork;

import static org.neo4j.driver.v1.Values.parameters;

public class HelloWorldExample implements AutoCloseable
{
    private final Driver driver;

    public HelloWorldExample( String uri, String user, String password )
    {
        driver = GraphDatabase.driver( uri, AuthTokens.basic( user, password ) );
    }

    @Override
    public void close() throws Exception
    {
        driver.close();
    }

    public void printGreeting( final String message )
    {
        try ( Session session = driver.session() )
        {
            String greeting = session.writeTransaction( new TransactionWork<String>()
            {
                @Override
                public String execute( Transaction tx )
                {
                    StatementResult result = tx.run( "CREATE (a:Greeting) " +
                                                     "SET a.message = $message " +
                                                     "RETURN a.message + ', from node ' + id(a)",
                            parameters( "message", message ) );
                    return result.single().get( 0 ).asString();
                }
            } );
            System.out.println( greeting );
        }
    }

    public static void main( String... args ) throws Exception
    {
        try ( HelloWorldExample greeter = new HelloWorldExample( "bolt://localhost:7687", "neo4j", "password" ) )
        {
            greeter.printGreeting( "hello, world" );
        }
    }
}