NotNullConstraintListener

Represents an event listener for validating not nullable fields. This listener is automatically registered in all data models.

Constructor

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Occurs before creating or updating a data object and validates not nullable fields.

Name	Type	Description
`e`	DataEventArgs \| *	An object that represents the event arguments passed to this operation.
`callback`	function	A callback function that should be called at the end of this operation. The first argument may be an error if any occured.

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