[hibernate-announce] a question to use <any> tag

a question to use <any> tag Hibernate version: 3.0 Mapping documents: <?xml version="1.0"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <hibernate-mapping package="com.crazyasp.testany"> <class name="TestAnyA" table="TestAnyA" polymorphism="implicit"> <id name="id" type="integer" column="id"> <generator class="native"/> </id> <set name="c" inverse="true"> <key> <column name="ownerId"/> </key> <one-to-many class="com.crazyasp.testany.TestAnyC"/> </set> </class> </hibernate-mapping> <?xml version="1.0"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <hibernate-mapping package="com.crazyasp.testany"> <class name="TestAnyB" table="TestAnyB" polymorphism="implicit"> <id name="id" type="integer" column="id"> <generator class="native"/> </id> <set name="c" cascade="delete" inverse="true"> <key> <column name="ownerId"/> </key> <one-to-many class="com.crazyasp.testany.TestAnyC"/> </set> </class> </hibernate-mapping> <?xml version="1.0"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <hibernate-mapping package="com.crazyasp.testany"> <class name="TestAnyC" table="TestAnyC" polymorphism="implicit"> <id name="id" type="integer" column="id"> <generator class="native"/> </id> <any name="owner" meta-type="string" id-type="integer"> <meta-value value="a" class="com.crazyasp.testany.TestAnyA"/> <meta-value value="b" class="com.crazyasp.testany.TestAnyB"/> <column name="ownerType"/> <column name="ownerId" not-null="false"/> </any> </class> </hibernate-mapping> Code between sessionFactory.openSession() and session.close(): Full stack trace of any exception that occurs: Name and version of the database you are using: postgresql 8.0 The generated SQL (show_sql=true): Hibernate: select nextval ('hibernate_sequence') Hibernate: insert into TestAnyC (ownerType, ownerId, id) values (?, ?, ?) Debug level Hibernate log excerpt: 2007-03-23 10:48:53,603 [main] WARN org.hibernate.util.JDBCExceptionReporter - SQL Error: 0, SQLState: null 2007-03-23 10:48:53,605 [main] ERROR org.hibernate.util.JDBCExceptionReporter - 批次处理0insert into TestAnyC (ownerType, ownerId, id) values (a, 1, 3)失败，调用getNextException查看原因。 2007-03-23 10:48:53,606 [main] WARN org.hibernate.util.JDBCExceptionReporter - SQL Error: 0, SQLState: 23503 2007-03-23 10:48:53,607 [main] ERROR org.hibernate.util.JDBCExceptionReporter - 错误: 插入或更新表 "testanyc" 违反外键约束 "fkbf7747a9ff594b5e" Detail: Key (ownerid)=(1) is not present in table "testanyb". 2007-03-23 10:48:53,633 [main] ERROR org.hibernate.event.def.AbstractFlushingEventListener - Could not synchronize database state with session org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update