总是在neo4j中加载某些子对象 [英] Always loading certain child object in neo4j

问题描述

class Node {
    Long id;
    String name;

    @Relationship(type="NodeToCategory")
    Address address;

    List<NodeB> nodeBList;



}

//node B CLass

class NodeB {
    Long id;
    String someOther;

    @Relationship(type="NodeToCategory")
    Address address;

    List<NodeC> nodeCList;



}

class Address {
    Long id;
    String name;
}

当我在Node上运行深度为2的查询时，它将返回nodeBList，但不会返回NodeB的地址.我想确保无论何时有地址对象，无论深度如何，都将始终返回地址.它不应将NodeB的地址返回为Null.

When I run a query with depth 2 on the Node it returns nodeBList but it does not return addresses of NodeB. I want to make sure whenever there is an address object it will always return address no matter the depth . It should not return Addresses of NodeB as Null .

一种方法是先加载所有地址，然后再尝试加载 Node.我正在努力避免这种情况.是否可以通过neo4jOGM中不知道的任何注释或其他功能来完成此操作?

One way of doing is to load all the address before and then trying to load Node . I am trying to avoid that. Is there any way of doing it via any annotations or other features that I do not know of in neo4jOGM ?

推荐答案

您可以通过在cypher中使用@Query和pattern来实现.对于具有一个地址的地址，它还将返回带有address的NodeB，而对于没有address的地址，将返回空地址.

You can achieved it by using @Query and pattern in your cypher. It will also return NodeB with address for those with one address and null address for those without address.

@Query("MATCH (na: Node) " +
  "WHERE na.name={0} " +
  "WITH na " +
  "MATCH p=(na)-[*0..2]->(n) " +
  "RETURN p")
public Node getNode(String name);

这篇关于总是在neo4j中加载某些子对象的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！