neo4j-如何通过rest api对1000个对象运行查询

Question

我需要运行带有1000个对象的查询。使用/batch终结点，我可以使它正常工作，但是太慢了（30秒处理300个项目）。

因此，我正在尝试与该文档页面中所述的方法相同：http :
//docs.neo4j.org/chunked/2.0.1/rest-api-cypher.html#rest-api-create-mutiple-
nodes-with -属性

将此JSON发布到 http://localhost:7474/db/data/cypher

{
    "params": {
        "props": [
            {
                "_user_id": "177032492760",
                "_user_name": "John"
            },
            {
                "_user_id": "177032492760",
                "_user_name": "Mike"
            },
            {
                "_user_id": "100007496328",
                "_user_name": "Wilber"
            }
        ]
    },
    "query": "MERGE (user:People {id:{_user_id}}) SET user.id = {_user_id}, user.name = {_user_name} "
}

问题是我收到此错误：

{ message: 'Expected a parameter named _user_id',
  exception: 'ParameterNotFoundException',
  fullname: 'org.neo4j.cypher.ParameterNotFoundException',
  stacktrace:
  ...

也许这仅适用于CREATE查询，如docs页面所示？

Answer 1

将FOREACH和MERGE与ON CREATE SET结合使用：

 FOREACH (p in {props} | 
    MERGE (user:People {id:{p._user_id}}) 
      ON CREATE  user.name = {p._user_name})

将此JSON发布到 http://localhost:7474/db/data/cypher

{
    "params": {
        "props": [
            {
                "_user_id": "177032492760",
                "_user_name": "John"
            },
            {
                "_user_id": "177032492760",
                "_user_name": "Mike"
            },
            {
                "_user_id": "100007496328",
                "_user_name": "Wilber"
            }
        ]
    },
    "query": "FOREACH (p in {props} | MERGE (user:People {id:{p._user_id}}) ON CREATE  user.name = {p._user_name}) "
}