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The Ed-Fi ODS SQL Server data store allows for the configuration of Cascading Updates on entities. Cascading Update specifies that if an update is made to a key value in a data row where the key value is referenced by foreign keys, then all existing foreign key values are updated to the new key value.1

The following ODS / API resources are already configured for Cascading Updates in the as-shipped solution:

  • Class Period
  • Grade
  • GradebookEntry
  • Location
  • Section
  • Student School Association
  • Student Section Association

As an illustrative example, the Grade table has an association to Student Section that is updated whenever the Student Section Association changes. The Grade metadata and table declarations have the following metadata and SQL:

<Aggregate root="Grade" allowPrimaryKeyUpdates="true">
	<Entity table="Grade" />
ALTER TABLE [edfi].[Grade] ADD CONSTRAINT [FK_Grade_StudentSectionAssociation] 
    FOREIGN KEY ([StudentUSI], [SchoolId], [ClassPeriodName], [ClassroomIdentificationCode], [LocalCourseCode], [UniqueSectionCode], [SequenceOfCourse], [SchoolYear], [TermDescriptorId], [BeginDate])
    REFERENCES [edfi].[StudentSectionAssociation]([StudentUSI], [SchoolId], [ClassPeriodName], [ClassroomIdentificationCode], [LocalCourseCode], [UniqueSectionCode], [SequenceOfCourse], [SchoolYear], [TermDescriptorId], [BeginDate])

Configuration Steps

Some implementers will find it useful to enable Cascading Updates on additional resources. To configure Cascading Updates on a resource, the following steps are required:

  • Step 1. Modify the DomainMetadata.xml file adding the allowPrimaryKeyUpdates="true" flag to the desired aggregate.
  • Step 2. Modify the 0030-ForeignKeys.sql  file that enables the ON UPDATE CASCADE syntax on the foreign keys that reference the base table’s primary key.

For an example of how this is done, see the code snippets related to the Grade resource, above.

1 For more details on Table Cascading Updates, see here