[英]Calling TimeTree using Neo4jClient
我正在使用下面的代码,试图从Neo4jClient调用TimeTree。
其他简单的Calls可以工作,但是这一步什么也没做。 没有错误,也没有新的时间对象。
public class Trip
{
public long Id { get; set; }
public string Name { get; set; }
}
public class UUID
{
public long Value { get; set; }
}
public class TimeStamp
{
//public long Id { get; set; }
//public string Name { get; set; }
public long time { get; set; }
}
public class User
{
public long Id { get; set; }
public string Name { get; set; }
public int Age { get; set; }
public string Email { get; set; }
}
class Program
{
static void Main(string[] args)
{
var client = new Neo4jClient.GraphClient(new Uri("http://localhost:7474/db/data"), "neo4j", "password");
client.Connect();
client.Cypher
.Match("(n)")
.DetachDelete("n")
.ExecuteWithoutResults();
var newUser = new User { Id = 456, Name = "Jim" };
client.Cypher
.Create("(user:User {newUser})")
.WithParam("newUser", newUser)
.ExecuteWithoutResults();
var newTrip = new Trip { Id = 001, Name = "Antibes" };
client.Cypher
.Match("(traveller:User)")
.Where((User traveller) => traveller.Id == 456)
.Create("(traveller)-[:TRAVELLING]->(travelling:Trip {newTrip})")
.WithParam("newTrip", newTrip)
.ExecuteWithoutResults();
var tstamp = client.Cypher
.Match("(trip:Trip)")
.Where((Trip trip) => trip.Name == "Antibes")
.With("trip AS tripToLink")
.Call("ga.timetree.events.attach({ node: 'tripToLink', time: 1483828451000, relationshipType: \"ARRIVING_ON\"})")
.Yield("node")
.Return(node => new { TimeStamp = node.As<TimeStamp>() });
以下内容在Shell中起作用:
MATCH (trip:Trip)
WHERE trip.Name = "Antibes"
WITH trip
CALL ga.timetree.events.attach({node: trip, time: 1483828451000 , relationshipType: "ARRIVING_ON"})
YIELD node RETURN node
首先-将所有代码都放在这里的出色工作,使工作变得更加轻松!
我认为这里的问题有两个方面:您拥有的tstamp
变量的类型为: ICypherFluentQuery<???>
(我使用'?'代表您要创建的匿名类型)-因此,您实际上需要获取结果得到任何回应。 在调用.Results
之前,您实际上不会执行查询。
通常,我喜欢按需创建查询,然后在执行以下操作:
var tstamp = client.Cypher....
/* rest of the query here */
var tStampResults = tstamp.Results;
当您这样做时,您可能会得到一个错误:
BadInputException: java.lang.String cannot be cast to org.neo4j.graphdb.Node
如果您查看在控制台中运行的查询的响应-您会看到您实际上回来了:
╒═══════════════════════════╕
│"node" │
╞═══════════════════════════╡
│{"Id":"1","Name":"Antibes"}│
└───────────────────────────┘
那是因为您是YIELD
ing node
,所以您只能转换为Trip
类型:
var query = client.Cypher
.Match("(trip:Trip)")
.Where((Trip trip) => trip.Name == "Antibes")
.With("trip")
.Call("ga.timetree.events.attach({node: trip, time: 1483828451000 , relationshipType: \"ARRIVING_ON\"})")
.Yield("node")
.Return(node => node.As<Trip>()); //<-- Change here
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