Spring Data Neo4J (SDN)使用Neo4jTemplate保存实体

Question

新手到SDN和Neo4j。使用sdn版本: 4.1.6.RELEASE)和neo4j版本: 3.1.0。

我正在尝试一种简单的编程方法，在没有任何存储库支持的情况下使用Neo4jTemplate来持久化对象，而且它似乎不起作用。

我的代码(独立应用程序)：

public class Scratchpad {

    public static void main(String[] args) throws Exception {
        Configuration config = new Configuration();
        config.driverConfiguration()
                .setDriverClassName("org.neo4j.ogm.drivers.http.driver.HttpDriver")
                .setCredentials("neo4j", "xxxx")
                .setURI("http://localhost:7474");

        System.out.println(config);

        SessionFactory sf = new SessionFactory(config, "domain");

        Session session = sf.openSession();

        final Neo4jTemplate neo4jTemplate = new Neo4jTemplate(session);

        PlatformTransactionManager pt =  new Neo4jTransactionManager(session);
        final TransactionTemplate transactionTemplate = new TransactionTemplate(pt);

        transactionTemplate.execute((TransactionCallback<Object>) transactionStatus -> {
            Person p = new Person("Jim", 1);
            p.worksWith(new Person("Jack", 2));
            p.worksWith(new Person("Jane", 3));
            neo4jTemplate.save(p, 2);
            return p;
        });
    }

}

我的实体(出现在包域中)如下所示：

@NodeEntity
public class Person {

    @GraphId
    private Long id;

    private String name;

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

    ;

    public Person(String name, long id) {
        this.id = id;
        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 -> person.getName()).collect(Collectors.toList());
    }

    public String getName() {
        return name;
    }

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

日志中没有错误的迹象。但是，当我使用web控制台查询Neo4J时，不存在节点。

Answer 1

在更多的研究中，发现问题在于@GraphId字段永远不应该设置值。

在这里解释：Spring Neo4j not save data

吸取的艰难教训:永远不要手动设置@GraphId .