Neo4j Cypher查询为null或IN

本文介绍了Neo4j Cypher查询为null或IN的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我有以下密码查询:

MATCH (parentD)-[:CONTAINS]->(childD:Decision)-[ru:CREATED_BY]->(u:User) 
WHERE id(parentD) = {decisionId}  
RETURN ru, u, childD 
SKIP 0 LIMIT 100

Decision实体可以属于0..N个Tenant对象

Decision entity can belong to 0..N Tenant objects

@NodeEntity
public class Decision {
    private final static String BELONGS_TO = "BELONGS_TO";

    @Relationship(type = BELONGS_TO, direction = Relationship.OUTGOING)
    private Set<Tenant> tenants = new HashSet<>();

....

}

我需要扩展上述Cypher查询，以返回所有childD，其中parentD和childD不属于Tenant的任何一个，也不属于Tenant，且其ID在{tenantIds}中提供.请帮助我进行此查询.

I need to extend the Cypher query above in order to return all childD where parentD and childD not belong to any of Tenant or belong to Tenant with IDs provided in {tenantIds} set. Please help me with this query.

推荐答案

密码是一种非常有表现力的语言，只需遵循您的文字要求即可.

Cypher is very expressive language, just follow your textual requirements...

MATCH (t:Tenant) WHERE ID(t) in {tenantIds}
WITH COLLECT(t) as tenants
MATCH (parentD)-[:CONTAINS]->(childD:Decision)-[ru:CREATED_BY]->(u:User) 
WHERE 
id(parentD) = {decisionId} 
AND
  // not belong to any of Tenant or belong to Tenant
  (not (parentD)-[:BELONGS_TO]-(:Tenant) OR  any(t in tenants WHERE (parentD)-[:BELONGS_TO]-(t)))
AND
  // not belong to any of Tenant or belong to Tenant 
  (not (childD)-[:BELONGS_TO]-(:Tenant)  OR  any(t in tenants WHERE (childD)-[:BELONGS_TO]-(t)))
RETURN ru, u, childD 
SKIP 0 LIMIT 100

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