java - Comparing JPA annotations -



java - Comparing JPA annotations -

i need check if entity has specific annotations (@elementcollection , @joincolumn)

for(annotation annotation : field.getannotations()) { if (annotation.equals("@elementcollection") || annotation.equals("@joincolumn")) //do } }

but how can check if there @joincolumn if it's this? (a @joincolumn "inside" @collectiontable)

@elementcollection @collectiontable(name = "alarm_plan_ids", joincolumns = { @joincolumn(name = "alarm_id", referencedcolumnname = "inst_id"), @joincolumn(name = "alarm_id_ak", referencedcolumnname = "inst_id_ak") }) protected set<instanceid> allplanidsinexistence;

thanks

use reflection on annotation object (e.g getdeclaredmethods). reveal getters sub-objects. can whatever need.

java jpa annotations

Comments

Post a Comment

Popular posts from this blog

ruby on rails - Devise Logout Error in RoR -

ruby on rails - Devise Logout Error in RoR - while using devise in ror, encountering unusual error when trying log out url different root url. displays me : actioncontroller::invalidauthenticitytoken in devise::sessionscontroller#destroy" for illustration if rooting path after log in '/structure', , seek log out '/general' error, while logging out '/structure' fine. any help highly appreciated. ruby-on-rails ruby devise
Read more

c# - Create a Notification Object (Email or Page) At Run Time -- Dependency Injection or Factory -

c# - Create a Notification Object (Email or Page) At Run Time -- Dependency Injection or Factory - i have code emails me notification when happens. trying add together page , also remove dependency on email. for reference; have name of notification want send stored string in database. @ runtime have list of people , string representation of want receive. i thought dependency injection ninject, kernel bindings got big , seemed hacking together. then thought simple factory, activator.createinstance(email/page) inotifcation, don't know how handle differing constructor parameters (unless utilize common, complex property, employee, has info need). so far have this: public interface inotification { void sendmessage(); } public class email: inotification { private readonly string _toemailaddress; private string body { { homecoming "email"; } } private static string smtphost { ...
Read more

model view controller - MVC Rails Planning -

model view controller - MVC Rails Planning - i'm starting rails , i'm building app stores films info, user can watch film , give grade on web application. i have coded cinema model, controller , views. now, have 2 questions: should need create model , controller grading? in case, should create or should wait , create first users model , controller? yes, on model , controller grades. that'd feasible way maintain track of who's graded what. it's create first, i'd start users, since grades depend on both films , users. ruby-on-rails model-view-controller
Read more