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kuni katsuya

jpa - When to use EntityManager.find() vs EntityManager.getReference() - Stack Overflow - 0 views

stackoverflow.com/...-vs-entitymanager-getreference

java JPA EntityManager find getReference

shared by kuni katsuya on 20 Nov 12 - No Cached
  • When to use EntityManager.find() vs EntityManager.getReference()
  • use getReference method when i do not need to access database state
  • getReference returns a proxy object which uses a powerful feature called
  • ...1 more annotation...
  • automatic dirty checking
  • kuni katsuya on 20 Nov 12
     
    "When to use EntityManager.find() vs EntityManager.getReference()"
kuni katsuya

java - what is difference between EntityManager.find() and EntityManger.getReference()? - Stack Overflow - 0 views

stackoverflow.com/...-and-entitymanger-getreference

java JPA EntityManager find getReference

shared by kuni katsuya on 20 Nov 12 - No Cached
  • what is difference between EntityManager.find() and EntityManger.getReference()?
  • find()
  • return an initialized instance of your object
  • ...6 more annotations...
  • If it is not already loaded in the EntityManager, it is retrieved from the database
  • getReference()
  • is allowed to return a proxy instread of an initialized instance, if the entity has not been loaded in the EntityManager before
  • In this proxy,
  • only the primary key attribute is initialized
  • Proxies can be created without hitting the database
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