How to insert a new record to table with foreign key

Question

I have 3 tables like this :
CREATE TABLE PERSON (
PK INTEGER NOT NULL,
NAME VARCHAR(10),
SSNUM INTEGER,
MGR INTEGER);
ALTER TABLE PERSON ADD CONSTRAINT PK_PERSON PRIMARY KEY (PK);
ALTER TABLE PERSON ADD CONSTRAINT FK_PERSON FOREIGN KEY (MGR) REFERENCES
PERSON (PK);
/* Tables
CREATE TABLE PROJECT (
PK INTEGER NOT NULL,
CODE_NAME INTEGER);
ALTER TABLE PROJECT ADD CONSTRAINT PK_PROJECT PRIMARY KEY (PK);
/* Tables
CREATE TABLE XREF (
PERSON INTEGER NOT NULL,
PROJECT INTEGER NOT NULL);
ALTER TABLE XREF ADD CONSTRAINT PK_XREF PRIMARY KEY (PERSON, PROJECT);
ALTER TABLE XREF ADD CONSTRAINT FK_XREF1 FOREIGN KEY (PERSON) REFERENCES
PERSON (PK);
ALTER TABLE XREF ADD CONSTRAINT FK_XREF2 FOREIGN KEY (PROJECT) REFERENCES
PROJECT (PK);
I do like the way of "ReverseTutoral" and the file .jdo here :
<?xml version="1.0" encoding="UTF-8"?>
<jdo>
<package name="reversetutorial">
<class name="Person" objectid-class="PersonId">
<extension vendor-name="kodo" key="class-column" value="none"/>
<extension vendor-name="kodo" key="lock-column" value="none"/>
<extension vendor-name="kodo" key="table" value="PERSON"/>
<field name="name">
<extension vendor-name="kodo" key="data-column"
value="NAME"/>
</field>
<field name="person">
<extension vendor-name="kodo" key="pk-data-column"
value="MGR"/>
</field>
<field name="persons">
<collection element-type="Person"/>
<extension vendor-name="kodo" key="inverse"
value="person"/>
<extension vendor-name="kodo" key="inverse-owner"
value="person"/>
</field>
<field name="pk" primary-key="true">
<extension vendor-name="kodo" key="data-column"
value="PK"/>
</field>
<field name="ssnum">
<extension vendor-name="kodo" key="data-column"
value="SSNUM"/>
</field>
<field name="xrefs">
<collection element-type="Xref"/>
<extension vendor-name="kodo" key="inverse"
value="person"/>
<extension vendor-name="kodo" key="inverse-owner"
value="person"/>
</field>
</class>
<class name="Project" objectid-class="ProjectId">
<extension vendor-name="kodo" key="class-column" value="none"/>
<extension vendor-name="kodo" key="lock-column" value="none"/>
<extension vendor-name="kodo" key="table" value="PROJECT"/>
<field name="codeName">
<extension vendor-name="kodo" key="data-column"
value="CODE_NAME"/>
</field>
<field name="pk" primary-key="true">
<extension vendor-name="kodo" key="data-column"
value="PK"/>
</field>
<field name="xrefs">
<collection element-type="Xref"/>
<extension vendor-name="kodo" key="inverse"
value="project"/>
<extension vendor-name="kodo" key="inverse-owner"
value="project"/>
</field>
</class>
<class name="Xref" objectid-class="XrefId">
<extension vendor-name="kodo" key="class-column" value="none"/>
<extension vendor-name="kodo" key="lock-column" value="none"/>
<extension vendor-name="kodo" key="table" value="XREF"/>
<field name="person">
<extension vendor-name="kodo" key="pk-data-column"
value="PERSON"/>
</field>
<field name="person2" primary-key="true">
<extension vendor-name="kodo" key="data-column"
value="PERSON"/>
</field>
<field name="project">
<extension vendor-name="kodo" key="pk-data-column"
value="PROJECT"/>
</field>
<field name="project2" primary-key="true">
<extension vendor-name="kodo" key="data-column"
value="PROJECT"/>
</field>
</class>
</package>
</jdo>
Data of those tables are :
PERSON :
| PK | NAME | SSNUM | MGR |
| 1 | ABC | 1 | 1 |
| 2 | DEF | 5 | 1 |
PROJECT
| PK | CODE_NAME |
| 1 | 12 |
| 2 | 13 |
And now I want to add a new record into table XREF : insert into XREF
values (1,1);
public void createData() {
Xref xref = new Xref();
Person person = new Person(1);
Project project = new Project(1);
xref.setPerson(person);
xref.setProject(project);
person.getXrefs().add(xref);
person.getXrefs().add(xref);
pm.currentTransaction().begin();
pm.makePersistent(xref);
pm.currentTransaction().commit();
I don't know why Kodo automatically insert new record to table PERSON ->
confilct Primary Key. The errors are :
0 [main] INFO kodo.Runtime - Starting Kodo JDO version 2.4.1
(kodojdo-2.4.1-20030126-1556) with capabilities: [Enterprise Edition
Features, Standard Edition Features, Lite Edition Features, Evaluation
License, Query Extensions, Datacache Plug-in, Statement Batching, Global
Transactions, Developer Tools, Custom Database Dictionaries, Enterprise
Databases, Custom ClassMappings, Custom ResultObjectProviders]
41 [main] WARN kodo.Runtime - WARNING: Kodo JDO Evaluation expires in 29
days. Please contact [email protected] for information on extending
your evaluation period or purchasing a license.
1627 [main] INFO kodo.MetaData -
com.solarmetric.kodo.meta.JDOMetaDataParser@e28b9: parsing source:
file:/D:/AN/Test/classes/reversetutorial/reversetutorial.jdo
3092 [main] INFO jdbc.JDBC - [ C:23387093; T:19356985; D:10268916 ] open:
jdbc:firebirdsql:localhost/3050:D:/An/test/temp.gdb (sysdba)
3325 [main] INFO jdbc.JDBC - [ C:23387093; T:19356985; D:10268916 ]
close:
com.solarmetric.datasource.PoolConnection@164dbd5[[requests=0;size=0;max=70;hits=0;created=0;redundant=0;overflow=0;new=0;leaked=0;unavailable=0]]
3335 [main] INFO jdbc.JDBC - [ C:23387093; T:19356985; D:10268916 ] close
connection
3648 [main] INFO jdbc.JDBC - Using dictionary class
"com.solarmetric.kodo.impl.jdbc.schema.dict.InterbaseDictionary" to
connect to "Firebird" (version "__WI-V6.2.972 Firebird 1.0.3)WI-V6.2.972
Firebird 1.0.3/tcp (annm)/P10") with JDBC driver "firebirdsql jca/jdbc
resource adapter" (version "0.1")
4032 [main] INFO jdbc.JDBC - [ C:25657668; T:19356985; D:10268916 ] open:
jdbc:firebirdsql:localhost/3050:D:/An/test/temp.gdb (sysdba)
4143 [main] INFO jdbc.SQL - [ C:25657668; T:19356985; D:10268916 ]
preparing statement <3098834>: INSERT INTO XREF(PERSON, PROJECT) VALUES
4224 [main] INFO jdbc.SQL - [ C:25657668; T:19356985; D:10268916 ]
executing statement <3098834>: [reused=1;params={(int)1,(int)1}]
4244 [main] INFO jdbc.SQL - [ C:25657668; T:19356985; D:10268916 ]
preparing statement <9090824>: INSERT INTO PERSON(MGR, NAME, PK, SSNUM)
VALUES (?, ?, ?, ?)
4315 [main] INFO jdbc.SQL - [ C:25657668; T:19356985; D:10268916 ]
executing statement <9090824>: [reused=1;params={null,null,(int)1,(int)0}]
4598 [main] WARN jdbc.JDBC - java.sql.SQLWarning: java.sql.SQLWarning:
resultSetType or resultSetConcurrency changed
4598 [main] WARN jdbc.JDBC - java.sql.SQLWarning: java.sql.SQLWarning:
resultSetType or resultSetConcurrency changed
4598 [main] INFO jdbc.JDBC - [ C:25657668; T:19356985; D:10268916 ] begin
rollback
4608 [main] INFO jdbc.JDBC - [ C:25657668; T:19356985; D:10268916 ] end
rollback 10ms
4628 [main] INFO jdbc.JDBC - [ C:25657668; T:19356985; D:10268916 ]
close:
com.solarmetric.datasource.PoolConnection@1878144[[requests=2;size=2;max=70;hits=0;created=2;redundant=0;overflow=0;new=2;leaked=0;unavailable=0]]
4628 [main] INFO jdbc.JDBC - [ C:25657668; T:19356985; D:10268916 ] close
connection
javax.jdo.JDOFatalDataStoreException:
com.solarmetric.kodo.impl.jdbc.sql.SQLExceptionWrapper:
[SQL=INSERT INTO PERSON(MGR, NAME, PK, SSNUM) VALUES (null, null, 1, 0)]
[PRE=INSERT INTO PERSON(MGR, NAME, PK, SSNUM) VALUES (?, ?, ?, ?)]
GDS Exception. violation of PRIMARY or UNIQUE KEY constraint "PK_PERSON"
on table "PERSON" [code=335544665;state=null]
NestedThrowables:
com.solarmetric.kodo.impl.jdbc.sql.SQLExceptionWrapper:
[SQL=INSERT INTO PERSON(MGR, NAME, PK, SSNUM) VALUES (null, null, 1, 0)]
[PRE=INSERT INTO PERSON(MGR, NAME, PK, SSNUM) VALUES (?, ?, ?, ?)]
GDS Exception. violation of PRIMARY or UNIQUE KEY constraint "PK_PERSON"
on table "PERSON"
at
com.solarmetric.kodo.impl.jdbc.runtime.SQLExceptions.throwFatal(SQLExceptions.java:17)
at
com.solarmetric.kodo.impl.jdbc.runtime.JDBCStoreManager.flush(JDBCStoreManager.java:416)
at
com.solarmetric.kodo.runtime.PersistenceManagerImpl.flush(PersistenceManagerImpl.java:575)
at
com.solarmetric.kodo.runtime.PersistenceManagerImpl.commit(PersistenceManagerImpl.java:438)
at reversetutorial.Finder.createData(Finder.java:74)
at reversetutorial.Finder.main(Finder.java:141)
NestedThrowablesStackTrace:
org.firebirdsql.jdbc.FBSQLException: GDS Exception. violation of PRIMARY
or UNIQUE KEY constraint "PK_PERSON" on table "PERSON"
at
org.firebirdsql.jdbc.FBPreparedStatement.internalExecute(FBPreparedStatement.java:425)
at
org.firebirdsql.jdbc.FBPreparedStatement.executeUpdate(FBPreparedStatement.java:136)
at
com.solarmetric.datasource.PreparedStatementWrapper.executeUpdate(PreparedStatementWrapper.java:111)
at
com.solarmetric.kodo.impl.jdbc.SQLExecutionManagerImpl.executePreparedStatementNonBatch(SQLExecutionManagerImpl.java:542)
at
com.solarmetric.kodo.impl.jdbc.SQLExecutionManagerImpl.executePreparedStatement(SQLExecutionManagerImpl.java:511
at
com.solarmetric.kodo.impl.jdbc.SQLExecutionManagerImpl.executeInternal(SQLExecutionManagerImpl.java:405)
at
com.solarmetric.kodo.impl.jdbc.SQLExecutionManagerImpl.flush(SQLExecutionManagerImpl.java:272
at
com.solarmetric.kodo.impl.jdbc.runtime.JDBCStoreManager.flush(JDBCStoreManager.java:411)
at
com.solarmetric.kodo.runtime.PersistenceManagerImpl.flush(PersistenceManagerImpl.java:575)
at
com.solarmetric.kodo.runtime.PersistenceManagerImpl.commit(PersistenceManagerImpl.java:438)
at reversetutorial.Finder.createData(Finder.java:74)
at reversetutorial.Finder.main(Finder.java:141)
at org.firebirdsql.gds.GDSException: violation of PRIMARY or UNIQUE KEY
constraint "PK_PERSON" on table "PERSON
at org.firebirdsql.jgds.GDS_Impl.readStatusVector(GDS_Impl.java:1683)
at org.firebirdsql.jgds.GDS_Impl.receiveResponse(GDS_Impl.java:1636)
at org.firebirdsql.jgds.GDS_Impl.isc_dsql_execute2(GDS_Impl.java:865)
at
org.firebirdsql.jca.FBManagedConnection.executeStatement(FBManagedConnection.java:782)
at
org.firebirdsql.jdbc.FBConnection.executeStatement(FBConnection.java:1072)
at
org.firebirdsql.jdbc.FBPreparedStatement.internalExecute(FBPreparedStatement.java:420)
at
org.firebirdsql.jdbc.FBPreparedStatement.executeUpdate(FBPreparedStatement.java:136)
at
com.solarmetric.datasource.PreparedStatementWrapper.executeUpdate(PreparedStatementWrapper.java:111)
at
com.solarmetric.kodo.impl.jdbc.SQLExecutionManagerImpl.executePreparedStatementNonBatch(SQLExecutionManagerImpl.java:542)
at
com.solarmetric.kodo.impl.jdbc.SQLExecutionManagerImpl.executePreparedStatement(SQLExecutionManagerImpl.java:511)
at
com.solarmetric.kodo.impl.jdbc.SQLExecutionManagerImpl.executeInternal(SQLExecutionManagerImpl.java:405)
at
com.solarmetric.kodo.impl.jdbc.SQLExecutionManagerImpl.flush(SQLExecutionManagerImpl.java:272)
at
com.solarmetric.kodo.impl.jdbc.runtime.JDBCStoreManager.flush(JDBCStoreManager.java:411)
at
com.solarmetric.kodo.runtime.PersistenceManagerImpl.flush(PersistenceManagerImpl.java:575)
at
com.solarmetric.kodo.runtime.PersistenceManagerImpl.commit(PersistenceManagerImpl.java:438)
at reversetutorial.Finder.createData(Finder.java:74)
at reversetutorial.Finder.main(Finder.java:141)
Exception in thread "main"

Answer 1

First off, use the '-primaryKeyOnJoin true' flag when running the reverse
mapping tool so that you can get rid of that useless Xref class and have
a direct relation between Person and Project. See the documentation on
reverse mapping tool options here:
http://www.solarmetric.com/Software/Documentation/latest/docs/ref_guide_pc_reverse.html
But your real problem is that you are creating new objects, assigning
primary key values, and expecting them to represent existing objects.
That's not the way JDO works. If you want to set relations to existing
objects in JDO, you use the PM to look up those objects. If you try to
create new objects, JDO will assume you want to insert new records into
the DB, and you'll get PK conflicts like you see here.
There are several good books out on JDO; if you're just starting out with
it, they might save you a lot of time and help you master JDO quickly.