ERD and Class Diagram...
What is the difference between ERD and Class Diasgram...??
Replies
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PraveenKumar PurushothamanHi Ghani,
The differences between class diagram and ERD, class diagram/model represent both structural and behavior features of a system (attribute and operations). Classes models act as a mold for the object instance. In class model, classes related to each other in association relationship, part-whole relationship and generalization relationship. Class models are more likely to map into real-world objects.
The entity model more likely to map into tables in database (repetitive records). Although database allow us create foreign keys and constraints to link up the records, but it's doesn't imply the relationships which modeled in class diagram, and somehow the relationships in entity models are more difficult to be understand by human.
Generally you can have one class in class diagram mapped to one entity in ERD. But for some situation, you can also have one class mapped to more than one entities, or one entity mapped to multiple classes. This is depends on your design (i.e. performance tune for database).
Of course you can add entity into your ERD without mapping it to classes in class diagram (just like the case mentioned above).
Hope this helps you! 😀 -
ghani
thanx very much praveen...Praveen-KumarHi Ghani,
The differences between class diagram and ERD, class diagram/model represent both structural and behavior features of a system (attribute and operations). Classes models act as a mold for the object instance. In class model, classes related to each other in association relationship, part-whole relationship and generalization relationship. Class models are more likely to map into real-world objects.
The entity model more likely to map into tables in database (repetitive records). Although database allow us create foreign keys and constraints to link up the records, but it's doesn't imply the relationships which modeled in class diagram, and somehow the relationships in entity models are more difficult to be understand by human.
Generally you can have one class in class diagram mapped to one entity in ERD. But for some situation, you can also have one class mapped to more than one entities, or one entity mapped to multiple classes. This is depends on your design (i.e. performance tune for database).
Of course you can add entity into your ERD without mapping it to classes in class diagram (just like the case mentioned above).
Hope this helps you! 😀
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