JPA OneToMany - ManyToOne Relation will not stored in DB

Question

Hi,
I have the following problem:
I have two tables:
Logon
-username
-password
-company_id
Company
-Name
So Company has a OneToMany Relation to Logon and Logon a ManyToOne to company
I have created the following Entity classes:
class Logon{
    @ManyToOne()
    @JoinColumn(name = "COMPANY_ID",insertable=false, updatable=false)
    private Company company;
class Company{
    @OneToMany(mappedBy="company", cascade=CascadeType.ALL)
    private Collection<Logon> logons = new Vector<Logon>();
}And here is the code to insert the data.
        Logon logon = new Logon();
        Company company = new Company();
        logon.setCompany(company);
        company.addLogon(logon);
        EntityTransaction trans = em.getTransaction();
        trans.begin()
        em.persist(logon);
        em.persist(company);
        trans.commit();After that code I have an entry in table Logon and an entry in table Company.
But the field company_id in table logon is always set to 0 and not to the company's id.
The tables where not created from the entities. I have to work with an existing MySQL DB.
Does someone has an idea?
regards
Gerald

Answer 1

hi
i am using 2 tables. In parent table i am giving
@OneToMany(cascade=CascadeType.ALL,fetch=FetchType.EAGER,mappedBy="meterInfo")
@JoinColumn(name="METERID")
private List<MeterSub> meterSubs=null;
subtable i am giving
@ManyToOne(optional=false,targetEntity=com.nexant.mdm.dto.MeterInfoDTO.class)
@JoinColumn(name="METERID",nullable=false, insertable=false, updatable=false)
private MeterInfoDTO meterInfo;
i am inserting the data by using the test class like this:
MeterInfoDTO mi = new MeterInfoDTO();
mi.setMeterID(4);
MeterSub ms = new MeterSub();
ms.setMeterInfo(mi);
ms.setMeterData("meterData12");
ms.setMeterSubPk("103");
//ms.setMeterID(2);
List<MeterSub> set = new ArrayList<MeterSub>();
set.add(ms);
mi.setMeterSubs(set);
mi.setMeterName("Sample Meter NAme");
mi.setMeterTimeZone("TZ");
Last i am saving the data.
while inserting the data its giving the following error:
ORA-02291: integrity constraint (SYSTEM.SYS_C0010451) violated - parent key not found
Error Code: 2291
Call: INSERT INTO METERSUB (METERSUBPK, METERDATA, METERID) VALUES (?, ?, ?)
means its not taking METERID from parent and its giving 0. thats why the error coming like this.
Can any please help me to resolve this
Thanks
Shannu