Suppose I want to draw a class diagram of a DAO and an Entity. The DAO is used to load instances of the Entity from the database. How can I represent this relationship on my class diagram? Is this considered one? I think it should be displayed on the diagram somehow:

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TL;DR: should I draw something between them or not?


2 Answers 2


DAO loads data from DB and CREATES instances of Entity:

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There is a special stereotype for such dependency. Class INSTANTIATES Class2, if it creates its instances. Exists in UML standard. ( I checked 2.4.1 - contemporary and 2.5 - the next one.)

  • how does this answer the question asked?
    – gnat
    Jan 27, 2014 at 14:43
  • DAO loads data from DB and CREATES instances of Entity. It is EXACTLY the answer for the question.
    – Gangnus
    Jan 27, 2014 at 14:44
  • @gnat Should we really repeat the question in the answer?
    – Gangnus
    Jan 27, 2014 at 14:58
  • in this case yes, since question title missed the key point addressed by your answer
    – gnat
    Jan 27, 2014 at 15:14

The closest I can think of is a usage relationship. Possible stereotypes: "use", "call", "create", "instantiate", "send".

SomeDAO ---<<use>>---> SomeEntity

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