逐出并包含在JPA中的Cache上

Question

In JPA,if I have two entity classes Account and CheckingAccount,such that CheckingAccount extends Account.I have a CheckingAccount entity instance with primary key of 10.

Cache c=//get a reference to caache from entity manager factory
c.evict(Account.class,10);
boolean flag1=c.contains(Account.class,10);
boolean flag2=c.contains(CheckingAccount.class,10);

will the value of both flags be false.

Answer 1

The first c.contains(Account.class,10) certainly will be false - you either have removed this entity from cache or it does not exist.

Second one c.contains(CheckingAccount.class,10) can be true if this entity has been put into cache.

The version of evict method which takes second argument works only for given entity of given id. It is not the same as Cache#evict(Class) which removes all entities along with them subclasses from cache.