Home » Eclipse Projects » EclipseLink » Problem with Foreign Composite Key sharing a field with a Primary Composite Key?
| Problem with Foreign Composite Key sharing a field with a Primary Composite Key? [message #390044] |
Fri, 10 July 2009 19:21  |
 Philihp Busby
Messages: 2
Registered: July 2009 |
Junior Member |
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My database has two entities; Company and Person. A Company can have many
People, but a Person must have only one Company. The table structure looks
as follows.
COMPANY
----------
owner PK
comp_id PK
c_name
PERSON
----------------
owner PK, FK1
personid PK
comp_id FK1
p_fname
p_sname
It has occurred to me that I could remove PERSON.OWNER and derive it
through the foreign key; however, I can't make this change without
affecting legacy code.
I have modeled these as JPA-annotated classes;
@Entity
@Table(name = "PERSON")
@IdClass(PersonPK.class)
public class Person
implements Serializable {
@Id
private String owner;
@Id
private String personid;
@ManyToOne
@JoinColumns(
{@JoinColumn(name = "owner", referencedColumnName = "OWNER",
insertable = false, updatable = false),
@JoinColumn(name = "comp_id", referencedColumnName = "COMP_ID",
insertable = true, updatable = true)})
private Company company;
private String p_fname;
private String p_sname;
...and standard getters/setters...
}
@Entity
@Table(name = "COMPANY")
@IdClass(CompanyPK.class)
public class Company
implements Serializable {
@Id
private String owner;
@Id
private String comp_id;
private String c_name;
@OneToMany(mappedBy = "company", cascade=CascadeType.ALL)
private List people;
...and standard getters/setters...
}
My PersonPK and CompanyPK classes are nothing special, they just serve as
a struct holding owner and the ID field, and override hashCode and
equals(o).
So far so good. I come across a problem, however, when trying to deal with
associations. It seems if I have an existing Company, and create a Person,
and associate to the Person to the Company and persist the company, the
association is not saved when the Person is inserted. For example, my main
code looks like this:
EntityManager em = emf.createEntityManager();
em.getTransaction().begin();
CompanyPK companyPK = new CompanyPK();
companyPK.owner="USA";
companyPK.comp_id="1102F3";
Company company = em.find(Company.class, companyPK);
Person person = new Person();
person.setOwner("USA");
person.setPersonid("5116628123"); //some number that doesn't exist yet
person.setP_fname("Hannah");
person.setP_sname("Montana");
person.setCompany(company);
em.persist(person);
This completes without error; however in the database I find that the
Person record was inserted with a null in the COMP_ID field. With
EclipseLink debug logging set to FINE, the SQL query is shown as:
INSERT IGNORE INTO PERSON (PERSONID,OWNER,P_SNAME,P_FNAME) VALUES (?,?,?,?)
bind => [5116628123,USA,Montana,Hannah,]
I would have expected this to be saved, and the query to be equivalent to
INSERT IGNORE INTO PERSON (PERSONID,OWNER,COMP_ID,P_SNAME,P_FNAME) VALUES
(?,?,?,?,?)
bind => [5116628123,USA,1102F3,Montana,Hannah,]
What gives? Is it incorrect to say updatable/insertable=true for one half
of a composite key and =false for the other half? If I have
updatable/insertable=true for both parts of the foreign key, then
Eclipselink fails to startup saying that I can not use the column twice
without having one set to readonly by specifying these options.
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| Re: Problem with Foreign Composite Key sharing a field with a Primary Composite Key? [message #390284 is a reply to message #390281] |
Mon, 13 July 2009 15:15  |
Philihp Busby
Messages: 2
Registered: July 2009 |
Junior Member |
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Reordering the columns has no affect.
Removing the ", insertable=false, updatable=false" from the owner causes
the insert person query to fail:
company = new Company();
company.setOwner("USA");
company.setComp_id("2000034");
company.setC_name("Spacely Sprockets");
em.persist(company);
Person person = new Person();
person.setOwner("USA");
person.setPersonid("20000A2");
person.setP_fname("George");
person.setP_sname("Jetson");
person.setCompany(company);
em.persist(person);
javax.servlet.ServletException: javax.persistence.RollbackException:
Exception [EclipseLink-4002] (Eclipse Persistence Services -
1.1.2.v20090612-r4475):
org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLException: ORA-00957: duplicate column name
Error Code: 957
Call: INSERT IGNORE INTO PERSON (PERSONID, OWNER, P_FNAME, P_SNAME, comp_id,
owner) VALUES (?, ?, ?, ?, ?, ?)
bind => [20000A2, USA, George, Jetson, 2000034, USA]
I will file a bug.
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