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.
Function | Description | Syntax |
---|---|---|
ISNULL
|
Checks if the variable provided is a null value. It returns
|
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
|
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: