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MySQL NDB Cluster API Developer Guide
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2.3.8.12 ForeignKey::getOnUpdateAction()

Description.  Get the foreign key's ON UPDATE action. This is a ForeignKey::FkAction and has one of the values NoAction, Restrict, Cascade, or SetNull.

Signature. 

FkAction getOnUpdateAction
    (
      void
    ) const

Parameters.  None.

Return value.  The sequence number of the column.