best way for mapping poco<->vertex with dse.graph

[Roustan Thierry]

Hi,

What is the best way for mapping poco with vertex ?

ex:

schema:

schema.propertyKey("id").Text().single().create()
schema.propertyKey("name").Text().single().create()
schema.vertexLabel("provider").partitionKey("id").properties("name").create()

code:

 class provider
    {
        public string id {get;set; }
        public string name { get; set; }
    }

string req = string.Format(@"g.V().has('provider','id','prov1').valueMap()");

  GraphResultSet rs= session.ExecuteGraphAsync(new SimpleGraphStatement(req)).Result;

how map an instance of provider to the result of query ?

Thanks

Thierry

[João Reis]

Hi,

The C# driver doesn't have a Mapper for graph statements. To read data from a GraphResultSet you can read the documentation here: https://docs.datastax.com/en/developer/csharp-driver-dse/2.6/features/graph-support/#handling-results

Best regards,

João Reis

[Roustan Thierry]

Hi,

What is the best way for getting values ?

Ex: 

I have this class

 public class LocalizedString

    {

        public string lang { get; set; }

        public string localizedstring { get; set; }

    }

    [CollectionName("publicreferential")]

    public class PublicReferential

    {

        public string uid { get; set; }

        public string code { get; set; }

        public List<LocalizedString> name { get; set; }

        public PublicReferential()

        {

            name = new List<LocalizedString>();

        }

    }

i have this schema

schema.propertyKey('uid').Text().single().create()

schema.propertyKey('code').Text().create()

schema.propertyKey('lang').Text().create()

schema.propertyKey('localizedstring').Text().multiple().properties('lang').create()

schema.vertexLabel('publicreferential').partitionKey('uid').clusteringKey('code').properties('localizedstring').create()

what is the best way for query the vertex and get values into an instance of this class ?

I want to retrieve one instance of partotionkey/cluserting key or all instances of partition key

another question ?

thanks

thierry

[Joao Reis]

Hi,

You will have to manually populate the instance of your class as there isn't a Mapper for DSE Graph. Try using the gremlin "valueMap" step, it may help you in this situation: http://tinkerpop.apache.org/docs/current/reference/#valuemap-step 

If you need further help with this you should contact DataStax. If you're a DataStax customer you can contact DataStax Support. Otherwise if you are interested in learning more about DataStax Enterprise feel free to contact DataStax here: https://www.datastax.com/contactus

Thanks,

João Reis  |  Senior Software Engineer - Drivers

joao...@datastax.com  |  datastax.com

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[Roustan Thierry]

Hi,

Effectively, i have used valueMap and deserialize graphnode into dictionary of collection

My code for mapping an instance of an object like this (it must be optimized...)

Thanks for your response.

Have a nice day.

Thierry

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