java - Hibernate cascading multiple layers -

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let's assume have following medical situation:

3 entities: consultation, 1 nullable prescription. prescription set of medicines.

i've modelled them follows: (java code stripped of unnecessary info)

consultation {     @id     @generatedvalue(strategy = generationtype.identity)     private long id;      @onetoone(cascade = cascadetype.all, mappedby = "consultation")     @joincolumn(name = "prescription_id")     private prescription prescription; }  prescription {     @id     @generatedvalue(strategy = generationtype.identity)     private long id;      @onetoone     @joincolumn(name = "consultation_id")     private consultation consultation;      @onetomany(cascade = cascadetype.all, mappedby = "prescription")     private set<medicine> medicines; }   medicine {     @id     @generatedvalue(strategy = generationtype.identity)     private long id;      @manytoone     @joincolumn(name = "prescription_id")     private prescription prescription; }

the problem:

when call entitymanager.persist(consultation), child entities saved in cascade: prescription , set of medicines, in respective tables. problem foreign keys values null.

  1. consultation.prescription_id = null
  2. prescription.consultation_id = null
  3. medicine.prescription_id = null

hibernate hql logs:

insert prescriptions (consultation_id, prescription_type) values (?, ?) insert medicines (description, name, prescription_id) values (?, ?, ?) insert consultations (cost, date_occured, description, diagnosis, employee_id, patient_id, reference_id) values (?, ?, ?, ?, ?, ?, ?)

what did misunderstand in cascading mechanism?

it seems did not update owner sides of associations; hibernate not check inverse sides when flushing associations database.

make sure update consultation field in prescription, , prescription field in medicine.

cascading has nothing ownership of associations; determines entity lifecycle operation cascaded associated entities.


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