Skip to main content

Relational routine

The Relational routine contains several functions which allow you to check affirmations based on boolean values.

You can access these functions by double-clicking the Relational node under the system routines folder in the Repository tree view.

Functions of the Relational routine
Function Description Syntax
ISNULL Checks if the variable provided is a null value.

It returns true if the value is NULL and false if the value is not NULL.

Relational.ISNULL(variable)
NOT Returns the complement of the logical value of an expression. Relational.NOT(expression)
isNull Checks if the variable provided is a null value.

It returns 1 if the value is NULL and 0 if the value is not NULL.

Relational.isNull(variable)
To check the Relational routine, you can use the ISNULL function, along with a tJava component, for example:
String str = null;
System.out.println(Relational.ISNULL(str));

In this example, the test result is displayed in the Run view:

The result is "true" in the Run view.

Did this page help you?

If you find any issues with this page or its content – a typo, a missing step, or a technical error – please let us know!