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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 IBM Cloud Data Engine Data Provider.
This article illustrates using LINQ to access tables within the IBM Cloud Data Engine via the CData ADO.NET Data Provider for IBM Cloud Data Engine. 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 IBM Cloud Data Engine Data Source".
Enter your data source connection information.
IBM Cloud Data Engine uses the OAuth and HMAC authentication standards. See the "Getting Started" chapter of the help documentation for a guide to using OAuth.
Below is a typical connection string:
Api Key=MyAPIKey;Instance CRN=myInstanceCRN;Region=myRegion;Schema=mySchema;OAuth Client Id=myOAuthClientId;OAuth Client Secret=myOAuthClientSecret;InitiateOAuth=GETANDREFRESH
- If saving your entity connection to App.Config, set an entity name. In this example we are setting IBMCloudDataEngineEntities 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 , update, delete, and insert commands. For example:
IBMCloudDataEngineEntities context = new IBMCloudDataEngineEntities();
var jobsQuery = from jobs in context.Jobs
select jobs;
foreach (var result in jobsQuery) {
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.