the UML relationship and the EJB entity relationship have different types of relationships. How can we relate the UML relationships to the Entity relationships.
Table 3: Multiplicity values and their indicators
Potential Multiplicity Values Indicator Meaning
0..1 Zero or one
1 One only
0..* Zero or more
* Zero or more
1..* One or more
3 Three only
0..5 Zero to Five
5..15 Five to Fifteen
one to one
one to many
many to one
many to many
what is the corresponding relationship in a entity relationship in EJB. How to map the 0..1, 0..*, 1...*, 3 etc in entity.
Hoping my question is valid.
First of all: Entity beans could be considered as an deprecated technology as it has been replaced by JPA. I would move towards JPA if I where you.
I think the word you're looking for is cardinality.
0..1 Is just a simple Entity reference.
0..* Is a OneToMany Relation
The others you'll have to combine OneToMany relations with NonNull entity references although I don't know if that is possible with Entity beans.
"Any fool can write code that a computer can understand. Good programmers write code that humans can understand." --- Martin Fowler
Please correct my English.