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LINQ to Phoenix 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 Phoenix Data Provider.
This article illustrates using LINQ to access tables within the Phoenix via the CData ADO.NET Data Provider for Phoenix. 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.
- 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.
- Choose EF Designer from Database and click Next.
- Add a new Data Connection, and change your data source type to "CData Phoenix Data Source".
Enter your data source connection information.
Connect to Apache Phoenix via the Phoenix Query Server. Set the Server and Port (if different from the default port) properties to connect to Apache Phoenix. The Server property will typically be the host name or IP address of the server hosting Apache Phoenix.
Authenticating to Apache Phoenix
By default, no authentication will be used (plain). If authentication is configured for your server, set AuthScheme to NEGOTIATE and set the User and Password properties (if necessary) to authenticate through Kerberos.
Below is a typical connection string:
Server=localhost;Port=8765;- If saving your entity connection to App.Config, set an entity name. In this example we are setting ApachePhoenixEntities as our entity connection in App.Config.
- 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 commands. For example:
ApachePhoenixEntities context = new ApachePhoenixEntities();
var mytableQuery = from mytable in context.MyTable
select mytable;
foreach (var result in mytableQuery) {
Console.WriteLine("{0} {1} ", result.Id, result.Id);
}
See "LINQ and Entity Framework" chapter in the help documentation for example queries of the supported LINQ.
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Phoenix ADO.NET Provider
Rapidly create and deploy powerful .NET applications that integrate with HBase through Apache Phoenix.
