These BIFs can be used to build up a complex selector for reading sets of data from the persistence layer. These BIFs are accessed via the pseudo unit with the same name as the object that is being queried eg. “Person” or “Car”
Type
Description
all
Simple all
equals
Equality
empty
Determine whether a variable is empty
between
Select a range of data between two values
lessThanOrEqual
Less or equals check
lessThan
Check if value is less than the value being compared to
greaterThan
Check if value is greater than the value being compared to
attributeIn
Attribute In
relationshipIn
Relationship In
contains
Check is collection has element(s)
beginsWith
Begin with
endsWith
End with
notEquals
Not Equals
notEmpty
Not empty
notBetween
Not between the data or elements
notContains
Collection does not contain element(s)
notBeginWith
Not begin with
notEndsWith
Check if value does not end with value being compared to
notAttributeIn
Attribute not in the given domain
notRelationshipIn
Use to check for relationship
union
Union
diff
Use to check for differences
intersect
Intersect
and
And (in most cases, use this rather than intersect)
These BIFs perform operations on single persistent entities. They are accessed via a method call on a variable holding an object instance or on the pseudo unit with the same name as the object that the method is being performed on
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