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https://issues.apache.org/jira/browse/OPENJPA-1682?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12876282#action_12876282
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Pinaki Poddar commented on OPENJPA-1682:
----------------------------------------
Can an unique column be nullable? The answer seems to vary across databases.
The observed DB2 error -542 points that DB2 does not allow a unique column to
be nullable.
" column-name CANNOT BE A COLUMN OF A PRIMARY KEY, A UNIQUE CONSTRAINT, OR A
PARENT KEY BECAUSE IT CAN CONTAIN NULL VALUES
Explanation : The code is used to report that a column identified in a PRIMARY
KEY, a UNIQUE constraint clause, or a parent key (via a REFERENCES clause) is
defined to allow null values."
While MySQL seems to allow a null value on a column with unique constraint.
OpenJPA currently works in a way that an unique constraint on a column *does
not imply* any nullability -- positive or negative.
Earlier (prior to revision 941362), we forced that an unique constraint on a
column *does imply* non-nullability. But OPENJPA-1387 made the point that
unique constraint should not imply non-nullable -- whch I tend to agree and
hence revision 941362 removed the implication.
But as the current issue shows, we need to make this implication database
dependent.
> TestSimpleXmlEntity.testId failed with invalid DB2 create table SQL statement
> -----------------------------------------------------------------------------
>
> Key: OPENJPA-1682
> URL: https://issues.apache.org/jira/browse/OPENJPA-1682
> Project: OpenJPA
> Issue Type: Bug
> Components: sql
> Affects Versions: 2.1.0
> Reporter: Albert Lee
>
> TestSimpleXmlEntity.testId starts failing with the following exception
> against DB2:
> TestSimpleXmlEntity.testId View test details
> (org.apache.openjpa.persistence.xml)
> <openjpa-2.1.0-SNAPSHOT-r422266:951071 nonfatal general error>
> org.apache.openjpa.persistence.PersistenceException: DB2 SQL Error:
> SQLCODE=-542, SQLSTATE=42831, SQLERRMC=NICKNAME_XML, DRIVER=3.50.152 {stmnt
> 65405926 CREATE TABLE NickNames_xml (A_ID_xml INTEGER NOT NULL, nickName_xml
> VARCHAR(20), CONSTRAINT U_NCKNXML_A_ID_XML UNIQUE (A_ID_xml, nickName_xml))}
> [code=-542, state=42831]
> at org.apache.openjpa.jdbc.meta.MappingTool.record(MappingTool.java:556)
> at org.apache.openjpa.jdbc.meta.MappingTool.record(MappingTool.java:456)
> Please wait... Show details »
> « Hide details
> <openjpa-2.1.0-SNAPSHOT-r422266:951071 nonfatal general error>
> org.apache.openjpa.persistence.PersistenceException: DB2 SQL Error:
> SQLCODE=-542, SQLSTATE=42831, SQLERRMC=NICKNAME_XML, DRIVER=3.50.152 {stmnt
> 65405926 CREATE TABLE NickNames_xml (A_ID_xml INTEGER NOT NULL, nickName_xml
> VARCHAR(20), CONSTRAINT U_NCKNXML_A_ID_XML UNIQUE (A_ID_xml, nickName_xml))}
> [code=-542, state=42831]
> at org.apache.openjpa.jdbc.meta.MappingTool.record(MappingTool.java:556)
> at org.apache.openjpa.jdbc.meta.MappingTool.record(MappingTool.java:456)
> at
> org.apache.openjpa.jdbc.kernel.JDBCBrokerFactory.synchronizeMappings(JDBCBrokerFactory.java:155)
> at
> org.apache.openjpa.jdbc.kernel.JDBCBrokerFactory.synchronizeMappings(JDBCBrokerFactory.java:159)
> at
> org.apache.openjpa.jdbc.kernel.JDBCBrokerFactory.newBrokerImpl(JDBCBrokerFactory.java:117)
> at
> org.apache.openjpa.kernel.AbstractBrokerFactory.newBroker(AbstractBrokerFactory.java:199)
> at
> org.apache.openjpa.kernel.DelegatingBrokerFactory.newBroker(DelegatingBrokerFactory.java:156)
> at
> org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:213)
> at
> org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:151)
> at
> org.apache.openjpa.persistence.test.SingleEMTestCase.setUp(SingleEMTestCase.java:47)
> at
> org.apache.openjpa.persistence.xml.TestSimpleXmlEntity.setUp(TestSimpleXmlEntity.java:28)
> at junit.framework.TestCase.runBare(TestCase.java:125)
> at
> org.apache.openjpa.persistence.test.AbstractPersistenceTestCase.runBare(AbstractPersistenceTestCase.java:503)
> at
> org.apache.openjpa.persistence.test.AbstractPersistenceTestCase.runBare(AbstractPersistenceTestCase.java:479)
> at junit.framework.TestResult$1.protect(TestResult.java:106)
> at junit.framework.TestResult.runProtected(TestResult.java:124)
> at junit.framework.TestResult.run(TestResult.java:109)
> at junit.framework.TestCase.run(TestCase.java:118)
> at
> org.apache.openjpa.persistence.test.AbstractPersistenceTestCase.run(AbstractPersistenceTestCase.java:179)
> at junit.framework.TestSuite.runTest(TestSuite.java:208)
> at junit.framework.TestSuite.run(TestSuite.java:203)
> at sun.reflect.GeneratedMethodAccessor52.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
> at java.lang.reflect.Method.invoke(Method.java:600)
> at
> org.apache.maven.surefire.junit.JUnitTestSet.execute(JUnitTestSet.java:213)
> at
> org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.executeTestSet(AbstractDirectoryTestSuite.java:140)
> at
> org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.execute(AbstractDirectoryTestSuite.java:127)
> at org.apache.maven.surefire.Surefire.run(Surefire.java:177)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:48)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
> at java.lang.reflect.Method.invoke(Method.java:600)
> at
> org.apache.maven.surefire.booter.SurefireBooter.runSuitesInProcess(SurefireBooter.java:345)
> at
> org.apache.maven.surefire.booter.SurefireBooter.main(SurefireBooter.java:1009)
> Caused by: org.apache.openjpa.lib.jdbc.ReportingSQLException: DB2 SQL
> Error: SQLCODE=-542, SQLSTATE=42831, SQLERRMC=NICKNAME_XML, DRIVER=3.50.152
> {stmnt 65405926 CREATE TABLE NickNames_xml (A_ID_xml INTEGER NOT NULL,
> nickName_xml VARCHAR(20), CONSTRAINT U_NCKNXML_A_ID_XML UNIQUE (A_ID_xml,
> nickName_xml))} [code=-542, state=42831]
> at
> org.apache.openjpa.lib.jdbc.LoggingConnectionDecorator.wrap(LoggingConnectionDecorator.java:257)
> at
> org.apache.openjpa.lib.jdbc.LoggingConnectionDecorator.wrap(LoggingConnectionDecorator.java:241)
> at
> org.apache.openjpa.lib.jdbc.LoggingConnectionDecorator.access$700(LoggingConnectionDecorator.java:70)
> at
> org.apache.openjpa.lib.jdbc.LoggingConnectionDecorator$LoggingConnection$LoggingStatement.executeUpdate(LoggingConnectionDecorator.java:951)
> at
> org.apache.openjpa.lib.jdbc.DelegatingStatement.executeUpdate(DelegatingStatement.java:136)
> at
> org.apache.openjpa.jdbc.schema.SchemaTool.executeSQL(SchemaTool.java:1200)
> at
> org.apache.openjpa.jdbc.schema.SchemaTool.createTable(SchemaTool.java:956)
> at org.apache.openjpa.jdbc.schema.SchemaTool.add(SchemaTool.java:533)
> at org.apache.openjpa.jdbc.schema.SchemaTool.add(SchemaTool.java:348)
> at org.apache.openjpa.jdbc.schema.SchemaTool.run(SchemaTool.java:325)
> at org.apache.openjpa.jdbc.meta.MappingTool.record(MappingTool.java:504)
> ... 33 more
> The create table constraint requires nickName_xml be "NOT NULL"
> Albert Lee
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