Foreign key constraint, not recognized during the synchronization of data with the model dictionary

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• Entity Association depends on foreign key constraint?

  Hello
  
  I use JDeveloper 10.1.3.4 and have a question, as shown in the subject of this announcement. By a design flaw, I added a foreign key on a table constraint at the level of the database for any purpose other than to achieve a relationship between master/detail your. Now the foreign key constraint fell to remedy the irregularity, but I don't know if the application is not a problem on the road.
  
  The application in question has a table named BILL and another table called VALIDATIONS, both with the same primary key composite (LDAP_UID, TERM), where we hear per semester.
  
  BILL is on students, the balance they have, etc. VALIDATION records the commitment, students make:
  

  BILL
  ------------------------------------------------
  LDAP_UID       TERM      BALANCE
  -------------  --------  --------
  john.miller    200902       1500
  
  
  VALIDATIONS
  ------------------------------------------------
  LDAP_UID       TERM      CONFIRM_NUMBER
  -------------  --------  --------------
  john.miller    200902    0901100005

  The foreign key constraint has been added on the table of VALIDATION, validations (LDAP_UID, TERM) reference (LDAP_UID, TERM) BILL. When the data model is accumulated in the application, an entity association was created automatically for this foreign key constraint, and then a link has been created on the association of the entity to achieve the effect mater-detail of the application:
  

  Table:               BILL
  Table:               VALIDATIONS
  Foreign Key:         VALIDATIONS(LDAP_UID, TERM) references BILL(LDAP_UID, TERM)
  Entity object:       Bill
  Entity object:       Vallidations
  Entity Association:  ValidationsBillFkAssoc (based on the foreign key)
  View object:         LoggedInStudent (from Bill)
  View object:         OneValidation (from Validations)
  View link:           ValidationByOneStudent (based on ValidationsBillFkAssoc.  This achieves master/detail
                                               between LoggedInStudent and OneValidation)

  This foreign key is now asking problem and should be deleted: Bill table contains the data from more than three semesters, whereas student commitments cumulatively saved in the table of VALIDATIONS must be maintained permanently. When data from older semesters are unloaded from the table of BILL, the lines stored in the table of VALIDATION are orphaned.
  
  I thought that the link of the view and the association of the entity dependent on the foreign key, so I removed before dropping the foreign key in the order listed here:
  

  Removed usage of of the VO (OneValidation) from the application module
  Deleted the view link (ValidationByOneStudent)
  Deleted the entity association (ValidationsBillFkAssoc)
  Dropped the foreign key in the database

  The master/detail relationship between the two your is still necessary. I added the link display, which now is based on common attributes (LdapUid, term) between the two, rather than based on the association of the entity. The modified application works very well with the database has changed and now the rows in the table of VALIDATION will not be an orphan.
  
  What is interesting and also troubling is that when I run a copy of the application which has been registered before these amendments, on the basis of data which dropped the foreign key constraint, the application still works, with the master-detail and everything. And the dependencies do not seem to matter. But isn't it?
  
  My question is: an entity association requires a corresponding foreign key in the database? If I use the copy of the application before the changes, it will be OK or it will cause unforeseen problems on the road?
  
  Thank you!
  
  Newman
  
  Edited by: J. Newman, October 6, 2009 10:31

  Hello

  If you've proven yourself that in fact there is no dependency between the association and the foreign key constraint. in fact you can create everything that (the primary keys, foreign keys, other constraints) only for your same features if you have nothing
  defined in database tables, which is obviously not right approach. and JDeveloper tells you only about the dependence of its use (if you want to delete something that is used some part... e. g VL in AM, EO in VO, VO in AM...)
  just to note - it is important to synchronize your OA if you change the definition of the data table. for example if you remove the foreign key of the table then right-click on EO and chose to sync - JDeveloper should acknowledge and ask you
  If you want to remove this constraint of EO.

  Kind regards

  Branislav

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• Details of the foreign key constraints

  Why foreign key constraints is not ongoing validation in case of null values?
  For example, in the table EMP and DEPT table, EMP. References DEPTNO Dept. DEPTNO.
  But I am able to insert rows into the EMP table that contains nulls for EMP. DEPTNO.

  Prasath N wrote:
  Why foreign key constraints is not ongoing validation in case of null values?
  For example, in the table EMP and DEPT table, EMP. References DEPTNO Dept. DEPTNO.
  But I am able to insert rows into the EMP table that contains nulls for EMP. DEPTNO.

  I guess he's saying essentially that a foreign key must have a parent key or can be an orphan. But may not be a key that is not listed in the parent.

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