用Neo4j访问数据

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.1.7.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.example</groupId>
	<artifactId>accessing-data-neo4j</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>accessing-data-neo4j</name>
	<description>Demo project for Spring Boot</description>

	<properties>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-neo4j</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

</project>

plugins {
	id 'org.springframework.boot' version '2.1.7.RELEASE'
	id 'io.spring.dependency-management' version '1.0.8.RELEASE'
	id 'java'
}

group = 'com.example'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '1.8'

repositories {
	mavenCentral()
}

dependencies {
	implementation 'org.springframework.boot:spring-boot-starter-data-neo4j'
	testImplementation 'org.springframework.boot:spring-boot-starter-test'
}

$ brew install neo4j

$ neo4j start

Starting Neo4j.
Started neo4j (pid 96416). By default, it is available at http://localhost:7474/
There may be a short delay until the server is ready.
See /usr/local/Cellar/neo4j/3.0.6/libexec/logs/neo4j.log for current status.

curl -v -u neo4j:neo4j POST localhost:7474/user/neo4j/password -H "Content-type:application/json" -d "{\"password\":\"secret\"}"

package com.example.accessingdataneo4j;

import java.util.Collections;
import java.util.HashSet;
import java.util.Optional;
import java.util.Set;
import java.util.stream.Collectors;

import org.neo4j.ogm.annotation.GeneratedValue;
import org.neo4j.ogm.annotation.Id;
import org.neo4j.ogm.annotation.NodeEntity;
import org.neo4j.ogm.annotation.Relationship;

@NodeEntity
public class Person {

	@Id @GeneratedValue private Long id;

	private String name;

	private Person() {
		// Empty constructor required as of Neo4j API 2.0.5
	};

	public Person(String name) {
		this.name = name;
	}

	/**
	 * Neo4j doesn't REALLY have bi-directional relationships. It just means when querying
	 * to ignore the direction of the relationship.
	 * https://dzone.com/articles/modelling-data-neo4j
	 */
	@Relationship(type = "TEAMMATE", direction = Relationship.UNDIRECTED)
	public Set<Person> teammates;

	public void worksWith(Person person) {
		if (teammates == null) {
			teammates = new HashSet<>();
		}
		teammates.add(person);
	}

	public String toString() {

		return this.name + "'s teammates => "
			+ Optional.ofNullable(this.teammates).orElse(
					Collections.emptySet()).stream()
						.map(Person::getName)
						.collect(Collectors.toList());
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}
}

Unresolved directive in <stdin> - include::complete/src/main/java/hello/PersonRepository.java[]

spring.data.neo4j.username=neo4j
spring.data.neo4j.password=secret

package com.example.accessingdataneo4j;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class AccessingDataNeo4jApplication {

	public static void main(String[] args) {
		SpringApplication.run(AccessingDataNeo4jApplication.class, args);
	}

}

Before linking up with Neo4j...
	Greg's teammates => []
	Roy's teammates => []
	Craig's teammates => []

Lookup each person by name...
	Greg's teammates => [Roy, Craig]
	Roy's teammates => [Greg, Craig]
	Craig's teammates => [Roy, Greg]