You are viewing the documentation for Blueriq 17. Documentation for other versions is available in our documentation directory.
boolean conditions are evaluated from left to the right. There is no order for the logical operators. Use parentheses to create hierarchy in your logical expressions. Example: TRUE OR (TRUE AND FALSE) will evaluate (TRUE AND FALSE) first.
AND
This function returns TRUE if all its arguments evaluate to TRUE; it returns FALSE if one or more arguments evaluate to FALSE.
Syntax
argument1 AND argument2 [AND ...]
- argument1 - The first boolean condition that you want to evaluate.
- argument2 - The first boolean condition that you want to evaluate.
- [AND …] - Additional boolean conditions that you want to evaluate.
Return type
- boolean
Examples
- TRUE AND TRUE results in TRUE
- TRUE AND FALSE results in FALSE
- TRUE AND ? (= UNKNOWN) results in UNKNOWN
OR
This function returns TRUE if at least one of its arguments evaluates to TRUE; it returns FALSE if none of the arguments evaluate to TRUE.
Syntax
argument1 OR argument2 [OR ...]
argument1 - The first boolean condition that you want to evaluate. argument2 - The first boolean condition that you want to evaluate. [OR …] - Additional boolean conditions that you want to evaluate.
Return type
- boolean
Examples
- TRUE OR TRUE results in TRUE
- TRUE OR FALSE results in TRUE
- TRUE OR ? (= UNKNOWN) results in TRUE
- FALSE OR ? (= UNKNOWN) results in FALSE (since none of the arguments is TRUE)
TRUE
This is the boolean value TRUE.
FALSE
This is the boolean value FALSE.
NOT
This operator reverses the value of its boolean argument.
Syntax
NOT argument
- argument - The boolean condition of which you want to reverse its value.
Return type
- boolean
Examples
- NOT (TRUE) results in FALSE
- NOT (TRUE AND FALSE) results in TRUE
- NOT (? (= UNKNOWN)) results in UNKNOWN
- NOT (NOT (TRUE)) results in TRUE
UNKNOWN
You can use the '?' (question mark), representing UNKNOWN, to check if an expression or an attribute has a value.
Example
Suppose a model with an entity Person and attributes Person.name and Person.age. In runtime, a user fills out a form and enters his name, but forgets to fill out his age.
As a result
- Person.name = ? returns FALSE since this attribute is filled out
- Person.age = ? returns TRUE since this attribute is not filled out and therefore is UNKNOWN
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