ISNULL

The ISNULL function checks whether a component is NULL. It returns true if the value is NULL, and false otherwise.

Supported Product Scenarios

The ISNULL function works in the following YiDA scenarios:

ISNULL(value1)

Attribute	Required	Description
value1	Yes	The value to evaluate.

Return value type	Description
Boolean	The evaluation result. Valid values: • true: The value is not NULL. • false: The value is NULL.

The following example uses the ISNULL() function to check whether an Attachment component is NULL.