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LINQ to QuickBase Data

LINQ provides general-purpose query facilities in .NET Framework 3.0 and above and provides one easy way to programmatically access data through from CData ADO.NET Data Providers. This example uses LINQ to access information from the QuickBase Data Provider.

This article demonstrates how to use LINQ to access QuickBase tables through the CData ADO.NET Data Provider for QuickBase. To do this you will LINQ to Entity Framework, which is used to generate the connection and can be used with any CData ADO.NET Data Providers to access data via 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 QuickBase Data Source".
  4. Enter your data source connection information.

    User Authentication Method

    To authenticate with user credentials, specify the following connection properties:

    1. Set the User and Password.
    2. If your application requires an ApplicationToken;, you must provide it otherwise an error will be thrown. You can find the ApplicationToken under SpecificApp > Settings > App management > App properties > Advanced settings > Security options > Manage Application Token.

    User Token Authentication

    To authenticate with a user token, specify the following connection properties:

    1. Set UserToken and you are ready to connect. You can find the UserToken under Quick Base > My Preferences > My User Information > Manage User Tokens.

    Below is a typical connection string:

    User=user@domain.com;Password=password;Domain=myinstance.quickbase.com;ApplicationToken=bwkxrb5da2wn57bzfh9xn24
  5. If saving your entity connection to App.Config, set an entity name. In this example we are setting QuickBaseEntities 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:

QuickBaseEntities context = new QuickBaseEntities(); var sampletable_1Query = from sampletable_1 in context.SampleTable_1 select sampletable_1; foreach (var result in sampletable_1Query) { 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.