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https://issues.apache.org/jira/browse/OPENJPA-2211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13294604#comment-13294604
]
Kevin Sutter commented on OPENJPA-2211:
---------------------------------------
I reproduced the problem by slightly modifying the
org.apache.openjpa.persistence.annotations.TestAdvAnnot JUnit. I added the
following method, expecting the Delete to happen before the Update. No such
luck...
public void testUniqueConstraintOrder()
{
String query = "Select f FROM FlightSchedule f WHERE f.planeName =
:pname";
int upd = 0;
OpenJPAEntityManager em =(OpenJPAEntityManager) currentEntityManager();
startTx(em);
FlightSchedule aw2 = (FlightSchedule) em.createQuery(query)
.setParameter("pname", "AmericaWest2")
.getSingleResult();
FlightSchedule aw3 = (FlightSchedule) em.createQuery(query)
.setParameter("pname", "AmericaWest3")
.getSingleResult();
aw3.setFlightName("AmericaWest2"); // change AW3 to AW2
em.remove(aw2); // remove the original AW2
endTx(em); // can we get the order right?
endEm(em);
}
It's not exactly the same object model and scenario that John described, but it
still shows that the SQL is not being ordered based on the UniqueConstraint
annotation.
The discussion that led to this JIRA is documented here:
http://openjpa.208410.n2.nabble.com/Order-of-SQL-Statements-td7580252.html
> Ordering of SQL Statements when using @UniqueConstraints
> --------------------------------------------------------
>
> Key: OPENJPA-2211
> URL: https://issues.apache.org/jira/browse/OPENJPA-2211
> Project: OpenJPA
> Issue Type: Bug
> Affects Versions: 2.2.0
> Reporter: John Boblitz
>
> Scenario:
> In my Model I have an Entity "Equipment" which contains a bi-directional
> @OneToMany relationship with "Axle". All entities have a primary key
> (uniqueId) which is contained in a MappedSuperClass "BaseEntity".
> Further, all Entities have a secondary unique key based on the business
> requirements. In the case of Axles, this is the equipmentId and the
> axleNumber. This is annotated in Axle through @UniqueConstraint.
> Axle is also defined as @ElementDependant in Equipment so a deletion of an
> Equipment or the delinking of an Axle from the Equipment will result in the
> deletion of the Axle. This works as intended.
> However, it is also necessary that any Axles defined after the deleted Axle
> (i.e. with a higher axelNumber) should "move up" the chain.
> Here is an illustration:
> Start with
> Equipment #413908
> Axle 1 #413966
> Axle 2 #498801
> Axle 3 #413965
> Axle 4 #504805
> User removes Axle 1 from the Collection (on screen)
> What "should" happen:
> Since the reference bewteen Axle 1 and equipment is set to null - Axel
> 1(413966) should be Removed from the Database.
> Axle 2 (498801) should become Axle 1
> Axle 3 (431965) should become Axle 2
> Axle 4 (504805) should become Axle 3
> However, the removal Axle 1 is occuring AFTER the statements which reorganize
> the other Axles. This causes a duplicate key error as Axle 2 tries to become
> Axle 1 before Axle 1 is removed from the database.
> according to the Manual, this should not occur:
> 13.2. Unique Constraints
> ...
> "The unique constraints you define are used during table creation to generate
> the proper database constraints, and may also be used at runtime to order
> INSERT, UPDATE , and DELETE statements. For example, suppose there is a
> unique constraint on the columns of field F. In the same transaction, you
> remove an object A and persist a new object B, both with the same F value.
> The JPA runtime must ensure that the SQL deleting A is sent to the database
> before the SQL inserting B to avoid a unique constraint violation."
> The following are the relevant portions of the code:
> ENTITIES
> @Entity
> @Table(schema = "galaxy11", name = "Equipment") public class Equipment
> extends BaseEntity {
> @JsonManagedReference
> @OneToMany(cascade = CascadeType.ALL, mappedBy = "equipmentId", fetch =
> FetchType.EAGER) @ElementDependent
> private Set<Axle> axles = new HashSet<Axle>();
> @Entity
> @Table(schema = "galaxy11", name = "Axle", uniqueConstraints=
> @UniqueConstraint(name="uq_Axle_equipmentId_axleNumber", columnNames = {
> "equipmentId", "axleNumber" })
> )
> public class Axle extends BaseEntity {
> @Basic
> @Column(columnDefinition = "int2")
> private short axleNumber;
> @JsonBackReference
> @ManyToOne(fetch = FetchType.EAGER)
> @JoinColumn(name = "equipmentId", columnDefinition = "int8", nullable =
> false)
> private Equipment equipmentId;
> THE DELETION CODE
> TreeSet<AxleDTO> axleDtos = new TreeSet<AxleDTO>(new Comparator<AxleDTO>() {
> @Override
> public int compare(AxleDTO pO1, AxleDTO pO2) {
> if (pO1.getAxleNumber() < pO2.getAxleNumber()) {
> return -1;
> } else if (pO1.getAxleNumber() == pO2.getAxleNumber()) {
> return 0;
> } else {
> return 1;
> } } });
> axleDtos.addAll(pData.getAxles());
> if (axleDtos != null && !axleDtos.isEmpty()) {
> short i = 1;
> Set<Axle> axles = new HashSet<Axle>();
> AxleMgr axleMgr = new AxleMgr(mPm);
> for (AxleDTO axleDto : axleDtos) {
> Axle axle = new Axle();
> axleMgr.toEntity(axleDto, axle);
> if (!axle.isActive()) {
> axle.setEquipmentId(null);
> } else {
> axle.setAxleNumber(i++);
> axle.setEquipmentId(pEntity);
> axles.add(axle);
> }
> }
> pEntity.setAxles(axles);
> }
> ** pData is the Data passed from the GUI
> TRACE OF STATMENTS
> UPDATE galaxy11.Equipment
> SET modified = ?, versionid = ?, length = ?, height = ?, wheelbase = ?,
> tareweight = ?, grossweight = ?
> WHERE uniqueid = ? AND versionid = ?
> [params=(Timestamp) 2012-06-11 13:47:18.21, (int) 33, (BigDecimal) 6.2,
> (BigDecimal) 3.1, (BigDecimal) 3.8, (BigDecimal) 6.7, (BigDecimal) 18, (long)
> 413908, (int) 32]
> - <t 656806424, conn 972792495> [27 ms] spent
> - <t 656806424, conn 972792495> executing prepstmnt 684003742 UPDATE
> galaxy11.Axle SET modified = ?, versionid = ?, equipmentid = ?, axlenumber =
> ?
> WHERE uniqueid = ? AND versionid = ?
> [params=(Timestamp) 2012-06-11 13:47:18.23, (int) 15, (long) 413908, (short)
> 2, (long) 413965, (int) 14]
> - <t 656806424, conn 972792495> [23 ms] spent
> - <t 656806424, conn 972792495> executing prepstmnt 10578812 UPDATE
> galaxy11.Axle SET modified = ?, versionid = ?, equipmentid = ?, axlenumber =
> ?
> WHERE uniqueid = ? AND versionid = ?
> [params=(Timestamp) 2012-06-11 13:47:18.24, (int) 2, (long) 413908, (short)
> 3, (long) 504805, (int) 1]
> - <t 656806424, conn 972792495> [21 ms] spent
> - <t 656806424, conn 972792495> executing prepstmnt 1704434230 UPDATE
> galaxy11.Axle SET modified = ?, versionid = ?, equipmentid = ?, axlenumber =
> ?
> WHERE uniqueid = ? AND versionid = ?
> [params=(Timestamp) 2012-06-11 13:47:18.24, (int) 13, (long) 413908, (short)
> 1, (long) 498801, (int) 12]
> - <t 656806424, conn 972792495> [22 ms] spent
> - <t 656806424, conn 972792495> executing prepstmnt 1141736277 UPDATE
> galaxy11.Motor SET modified = ?, versionid = ?
> WHERE uniqueid = ? AND versionid = ?
> [params=(Timestamp) 2012-06-11 13:47:18.24, (int) 28, (long) 414058, (int) 27]
> - <t 656806424, conn 972792495> [21 ms] spent
> - <t 656806424, conn 972792495> executing prepstmnt 1395221594 DELETE FROM
> galaxy11.Axle WHERE uniqueid = ? AND versionid = ?
> [params=(long) 413966, (int) 14]
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