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LINQ to ADP 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 ADP Data Provider.

This article illustrates using LINQ to access tables within the ADP via the CData ADO.NET Data Provider for ADP. 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 ADP Data Source".

  4. Enter your data source connection information.

    Connect to ADP by specifying the following properties:

    • SSLClientCert: Set this to the certificate provided during registration.
    • SSLClientCertPassword: Set this to the password of the certificate.
    • UseUAT: The connector makes requests to the production environment by default. If using a developer account, set UseUAT = true.
    • RowScanDepth: The maximum number of rows to scan for the custom fields columns available in the table. The default value will be set to 100. Setting a high value may decrease performance.

    The connector uses OAuth to authenticate with ADP. OAuth requires the authenticating user to interact with ADP using the browser. For more information, refer to the OAuth section in the Help documentation.

    Below is a typical connection string:

    OAuthClientId=YourClientId;OAuthClientSecret=YourClientSecret;SSLClientCert='c:\cert.pfx';SSLClientCertPassword='admin@123'InitiateOAuth=GETANDREFRESH
  5. If saving your entity connection to App.Config, set an entity name. In this example we are setting ADPEntities 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:

ADPEntities context = new ADPEntities(); var workersQuery = from workers in context.Workers select workers; foreach (var result in workersQuery) { Console.WriteLine("{0} {1} ", result.Id, result.AssociateOID); }

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