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Binding to OLAP Data Sources

ASPxPivotGrid allows you to visualize data contained in a cube deployed on an OLAP server. In OLAP mode, the ASPxPivotGrid delegates data management operations (such as summarization, grouping, etc.) to the server side. Thus, you can use OLAP binding mode to process large amounts of data. The following KB article describes recommendations related to using OLAP data sources: How to improve the PivotGrid performance.

Expanded Requirements and Limitations

To learn more about requirements and limitations imposed by binding to OLAP data sources, see Requirements and Limitations.

Expanded OLAP Data Providers

ASPxPivotGrid supports the following data providers used to establish a connection to OLAP cubes.

  • OLE DB for OLAP - A native provider for Analysis Services database connections.
  • ADOMD.NET - A Microsoft .NET Framework data provider that is designed to communicate with Microsoft SQL Server Analysis Services. ADOMD.NET uses the XML for Analysis protocol to communicate with analytical data sources by using either TCP/IP or HTTP connections to transmit and receive SOAP requests and responses that are compliant with the XML for Analysis specification.
    Note

    Note that the ADOMD.NET data provider provides a better performance than OLE DB for OLAP and provides additional capabilities. To learn more, see Data providers used for Analysis Services connections.

  • XMLA - Provides the capability to connect to an OLAP cube over HTTP protocol. This method does not require any data access libraries or data providers to be installed on the client system.

To specify the required data provider, use the ASPxPivotGrid.OLAPDataProvider property.

Expanded Binding to an OLAP cube at Design Time

You can bind the Pivot Grid to an OLAP cube at design time by clicking the button next to the Choose OLAP Data Source option...

... or by clicking the ellipsis button next to the ASPxPivotGrid.OLAPConnectionString property available in the standard Properties window. All these actions invoke the Connection String Editor dialog containing the following settings.

  • Provider - Allows you to specify the version of the Microsoft Analysis Services OLE DB Provider for the Microsoft SQL Server. Note that MSOLAP identifies the latest version of the OLE DB provider.
  • Server Name - Specifies the name of the OLAP server that runs an instance of Microsoft SQL Server Analysis Services (SSAS). You can also specify the full path to a local cube file.
    Note

    Click the Retrieve Schema button to obtain the available catalogs/cubes contained in the specified server.

  • Catalog Name - Specifies a data catalog that contains cubes.
  • Cube Name - Specifies the name of a cube that provides data.
  • Query Timeout - The maximum amount of time (in seconds) allowed for a query to SSAS to complete. If the parameter is set to 0, each query can last indefinitely.
  • Language - Specifies the locale used to retrieve translations from an OLAP server.
  • Connection Timeout - Specifies the time (in seconds) to wait while trying to establish a connection before terminating the attempt and generating an error.
  • UserId - Specifies the user name used to authenticate an OLAP server.
  • Password - Specifies the password used to authenticate an OLAP server.
  • Roles - Specifies a comma-delimited list of predefined roles to connect to a server or database using permissions allowed by this role. To learn more, see Connection String Properties (Analysis Services).
  • CustomData - Specifies a function that can be used to pass a configuration setting to be used by Multidimensional Expressions (MDX) functions and statements. To learn more, see CustomData (MDX).
Note

To display all settings available in the Connection String Editor, enable the Show Advanced Properties checkbox.

After connecting the Pivot Grid to a data source, create the required fields. You can do this using the ASPxPivotGrid Designer.

Expanded Binding to an OLAP cube in Code

To bind ASPxPivotGrid to an OLAP cube in code, do the following.

Show Me

A complete sample project is available in the DevExpress Code Examples database at http://www.devexpress.com/example=T344653.

If you have a cube on the OLAP server (Microsoft Analysis Services), you can view its data using the ASPxPivotGrid control. In this example, you will see how to specify connection settings to the server and create fields that represent specific measures and dimensions of the cube.

To bind the Pivot Grid control to an OLAP cube, follow the steps below.

  • Set ADOMD as a data provider using the ASPxPivotGrid.OLAPDataProvider property.

  • Specify connection settings to the server using the ASPxPivotGrid.OLAPConnectionStrings property. The connection string used in the example is shown below.

    OlapConnectionString="Provider=MSOLAP;Data Source=http://demos.devexpress.com/Services/OLAP/msmdpump.dll;Initial catalog=Adventure Works DW Standard Edition;Cube name=Adventure Works;Query Timeout=100;"
  • Create fields for all the measures and dimension in the bound OLAP cube, and moves these fields to the specified area, hiding them. To do it, use the ASPxPivotGrid.RetrieveFields method overload and set the field's visibility to false.

  • Place some of the created fields within corresponding Pivot Grid Control areas and set the visibility of the fields to true, using the PivotGridFieldBase.Visible property.

Use the invoked Customization Form to specify the Pivot Grid control's layout.

To learn more about OLAP Datasources, see OLAP Datasources.

Expanded See Also

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