如何通过直接关系将嵌套列表插入neo4j密码查询语言

问题描述

我想通过密码查询语言在neo4j 4.1.1中插入一个多级列表。

我要插入的数据是json中返回的报告列表。属性之一是报表背后的模型。我想为列表中的每个报表创建一个节点，再为给定报表上的每个模型创建一个节点，并在报表和模型之间（在报表上给定）添加关系。这将是每天一次的数据刷新，因此，如果neo4j数据库中不存在新的报告节点，那么我想创建它们，如果报告已经存在，我想在有新信息的情况下覆盖数据。

示例数据：

[
    {
        "name": "Report 1","description": "Report Description","createdBy": "TRAINING1","id": "04CA095985D9A838E10000000A4E740E","created": "2020-02-14T14:27:56.371Z","changed": "2020-02-14T14:27:56.371Z","istemplate": false,"isSample": false,"models": [
            {
                "description": "Model 1","id": "id of the model","isPlanning": true
            },{
                "description": "Model 2",{
                "description": "Model 3",],"changedBy": "TRAINING1","openURL": "URL of the report"
    },{
        "name": "Report 2","id": "0653F758E5264C49E10000000A4E740E","models": [
            {
                "description": "Model description",{
                "description": "Model description",{
        "name": "Report Name 3","description": "Report description 3","created": "2020-02-14T14:27:55.010Z","changed": "2020-02-14T14:27:55.010Z","models": [
            {
                "description": "description of the model",{
                "description": "model description","id": "this is an id","isPlanning": true
            }
        ],"openURL": "URL of the report"
    }
]

我想成为的图形如下： Example graph

我尝试的查询如下：

UNWIND $propsArray as props
      MERGE (sac:sacreports { id: props.id })
        ON CREATE
          SET sac = {id: props.id,name: props.name }
          UNWIND props.models as model
          MERGE (m: sacmodels {id: model.id})
          ON CREATE SET m = {id: model.id,description: model.description }
          ON MATCH SET m = {id: model.id,description: model.description }
        ON MATCH 
          SET sac = {id: props.id,name: props.name,description: props.description }
          UNWIND props.models as model
          MERGE (m: sacmodels {id: model.id})
          ON CREATE SET m = {id: model.id,description: model.description }
          
      RETURN sac

我收到以下错误消息：Neo4jError：MERGE和UNWIND之间需要WITH（第7行，第11列（偏移量：181））。

关于如何执行此操作的任何建议？

谢谢！

解决方法

我认为ON CREATE和ON MATCH仅支持单个SET子句。而且，您永远不会在查询中的报表和模型之间建立关系。而且，如果要按节点的ID进行合并，则不想在ON CREATE语句中覆盖它。我将使用以下查询：

UNWIND $propsArray as props
      MERGE (sac:sacreports { id: props.id })
        ON CREATE SET sac += {name: props.name,description: props.description}
      WITH sac,props
      UNWIND props.models as model
          MERGE (m: sacmodels {id: model.id})
          ON CREATE SET m += {description: model.description }
          MERGE (sac)-[:IS_USED_IN]->(m)

cypher neo4j