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Support for Queries

  • Artigo

This topic applies to Windows Workflow Foundation 4 (WF4).

The SQL Workflow Instance Store records a set of well-known properties in the store. Users can query for instances based on these properties. The following list contains some of these well-known properties:

  • Site Name. Name of the Web site that contains the service.

  • Relative Application Path. Path of the application relative to the Web site.

  • Relative Service Path. Path of the service relative to the application.

  • Service Name. Name of the service.

  • Service Namespace. Name of the namespace that the service uses.

  • Current Machine.

  • Last Machine. The computer on which the workflow service instance ran the last time.

Note

For self-hosted scenarios using Workflow Service Host, only the last four properties are populated. For Workflow Application scenarios, only the last property is populated.

The workflow runtime supplies values for the first three properties. The workflow service host supplies the value for the Suspend Reason property. The SQL Workflow Instance Store itself supplies values for the Last Updated Machine property.

The SQL Workflow Instance Store feature also lets you specify the custom properties for which you want to store the values in the persistence database and that you want to use in queries. For more information about custom promotions, see Store Extensibility.

Views

The instance store contains the following views. See Persistence Database Schema for further details.

The Instances View

The Instances view contains the following fields:

  1. Id

  2. PendingTimer

  3. CreationTime

  4. LastUpdatedTime

  5. ServiceDeploymentId

  6. SuspensionExceptionName

  7. SuspensionReason

  8. ActiveBookmarks

  9. CurrentMachine

  10. LastMachine

  11. ExecutionStatus

  12. IsInitialized

  13. IsSuspended

  14. IsCompleted

  15. EncodingOption

  16. ReadWritePrimitiveDataProperties

  17. WriteOnlyPrimitiveDataProperties

  18. ReadWriteComplexDataProperties

  19. WriteOnlyComplexDataProperties

The ServiceDeployments view

The ServiceDeployments view contains the following fields:

  1. SiteName

  2. RelativeServicePath

  3. RelativeApplicationPath

  4. ServiceName

  5. ServiceNamespace

The InstancePromotedProperties view

The InstancePromotedProperties view contains the following fields. For details on promoted properties, see the Store Extensibility topic.

  1. InstanceId

  2. EncodingOption

  3. PromotionName

  4. Value# (a range of fields from Value1 to Value64).