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Rapidly create and deploy powerful .NET applications that integrate with Elasticsearch.

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LINQ to Elasticsearch Data


LINQ offers versatile querying capabilities within the .NET Framework (v3.0+), offering a straightforward method for programmatic data access through CData ADO.NET Data Providers. In this article, we demonstrate the use of LINQ to retrieve information from the Elasticsearch Data Provider.

This article illustrates using LINQ to access tables within the Elasticsearch via the CData ADO.NET Data Provider for Elasticsearch. To achieve this, we will use LINQ to Entity Framework, which facilitates the generation of connections and can be seamlessly employed with any CData ADO.NET Data Providers to access data through LINQ.

See the help documentation for a guide to setting up an EF 6 project to use the provider.

  1. In a new project in Visual Studio, right-click on the project and choose to add a new item. Add an ADO.NET Entity Data Model.
  2. Choose EF Designer from Database and click Next.
  3. Add a new Data Connection, and change your data source type to "CData Elasticsearch Data Source".

  4. Enter your data source connection information.

    Set the Server and Port connection properties to connect. To authenticate, set the User and Password properties, PKI (public key infrastructure) properties, or both. To use PKI, set the SSLClientCert, SSLClientCertType, SSLClientCertSubject, and SSLClientCertPassword properties.

    The data provider uses X-Pack Security for TLS/SSL and authentication. To connect over TLS/SSL, prefix the Server value with 'https://'. Note: TLS/SSL and client authentication must be enabled on X-Pack to use PKI.

    Once the data provider is connected, X-Pack will then perform user authentication and grant role permissions based on the realms you have configured.

    Below is a typical connection string:

    Server=127.0.0.1;Port=9200;User=admin;Password=123456;
  5. If saving your entity connection to App.Config, set an entity name. In this example we are setting ElasticsearchEntities as our entity connection in App.Config.
  6. Enter a model name and select any tables or views you would like to include in the model.

Using the entity you created, you can now perform select , update, delete, and insert commands. For example:

ElasticsearchEntities context = new ElasticsearchEntities(); var ordersQuery = from orders in context.Orders select orders; foreach (var result in ordersQuery) { Console.WriteLine("{0} {1} ", result.Id, result.OrderName); }

See "LINQ and Entity Framework" chapter in the help documentation for example queries of the supported LINQ.