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Persisting variable values to other parts of the cypher query


Persisting variable values to other parts of the cypher query

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Persisting variable values to other parts of the cypher query
Tag : neo4j , By : SachinJadhav
Date : November 28 2020, 04:01 AM

I think the issue was by ths following , You won't be able to use this approach, as you discovered variables introduced in FOREACH won't be available outside of it.
You may want to look at using APOC conditional procedures (use the apoc.do.when() proc) in place of the FOREACH workaround. You can return values from the executed Cypher that are exposed via the yielded value map variable.
CALL apoc.do.when("${record:value('/11')}" <> "", 
"MERGE (company:Company{name:\"${record:value('/11')}\"}) RETURN company") YIELD value
WITH value.company as company
...

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How to put a variable in a Neo4j cypher query for a repository


Tag : java , By : socurious
Date : March 29 2020, 07:55 AM
I hope this helps . I am using spring neo4j. I have a repository class that extends GraphRepository. I want to delete a specific object based on the uid in the arguments to the method below. , You need to use {0} instead of the name as shown below
@Query("START n=node:node_auto_index(uid={0})" +
                "MATCH n-[r]-()" +
                "DELETE n, r")
public void deleteByUid(String uidValueYAA);

Cypher: what parts of a pattern can be bound to a variable?


Tag : neo4j , By : user167963
Date : March 29 2020, 07:55 AM
help you fix your problem To answer the question posed in the title:
Within the MATCH clause specifically, paths, nodes, and relationships can be bound to identifiers:
MATCH p = (n)-[r]-(m)
MATCH p = (n)-[r]-(m)
WITH n.name AS identifier
MATCH p = (n)-[r]-(m)
WITH COUNT(r) AS some_identifier
MATCH p = (n)-[r]-(m)
WITH EXTRACT(x IN NODES(p) | x.name) AS another_identifier
MATCH (n:User {name:"Alice"})
RETURN n
MATCH (n:User)
WHERE n.name = "Alice"
RETURN n

CYPHER QUERY :-Change Arrayreturned by collect(n.name) in cypher query to Arraylist (util)


Tag : java , By : Chris Woods
Date : March 29 2020, 07:55 AM
may help you . Neo4j cypher query collect() return Array in result. In order to iterate it we need it to add in arrayList. The previous process we used is not helping us and throwing an exception. , Have you checked to see the actual object returned by
resultSet.getObject("ids")

Tag : java , By : Henry Fatino
Date : March 29 2020, 07:55 AM
should help you out The state in your map function is on a per-key basis. So when your map function is called, and you get the map state, it will be for whatever id is in the MqttTemperature record that is being processed.
Given that you want per-room average temperatures, the way I would handle this is as follows:

Query parameters are persisting values


Tag : chash , By : Shrek Qian
Date : March 29 2020, 07:55 AM
it fixes the issue When you call your first GET, you create a DataManager. That DataManager only knows about the first query params. It then executes on a timer with those parameters.
When you call your second GET, you are creating a second DataManager. That second manager will also start executing on a timer with the 2nd set of parameters, but it does not affect the first one at all.
private DataManager _manager;

    [HttpGet]
    public async Task<IActionResult> Get([FromQuery] PagedTransactionDataRequest queryParams)
    {
        var pageSize = queryParams.PageSize ?? 1;
        var pageNumber = queryParams.PageNumber ?? 10;

if(_manager == null) {_manager = new DataManager(async () =>
        await _paymentDraftHub.Clients.All.SendAsync(SignalRConstants.TransferPaymentDraftServiceData, await _paymentTransactionRepository.GetAllDeclinedAsync(pageSize, pageNumber))
        );
}
else
{_manager.action = async () => await _paymentDraftHub.Clients.All.SendAsync(SignalRConstants.TransferPaymentDraftServiceData, await _paymentTransactionRepository.GetAllDeclinedAsync(pageSize, pageNumber));
}

        var response = new ResponseMessage { Message = "Accepted", Code = "201" };
        return Ok(response);
    }
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