【发布时间】：2013-11-27 06:27:08
【问题描述】：
我正试图绕过休眠，但我遇到了一些障碍。当我尝试将代码插入我的 hsqldb 时，我收到了 SQLIntegrityConstraintViolationException
基本设置是有一个song，playlisttable。播放列表应该只是映射到它们包含的 song_ids。所以，我的课程设置如下。
播放列表类
@Entity
public class MyPlaylist {
@Id @GeneratedValue
private int id;
private String name;
@ElementCollection
@OneToMany(fetch=FetchType.EAGER) @Cascade(CascadeType.ALL)
private List<Song> songs;
歌曲课
@Entity
public class Song {
@Id @GeneratedValue(strategy=GenerationType.AUTO)
private int id;
private String title;
private String artist;
private String album;
private String filePath;
private String trackLength;
客户代码
// Along the lines of...
List<Song> playlistSongs = loadSongs();
Playlist p = new Playlist("MyPLaylist", playlistSongs);
SessionFactory factory = new Configuration().configure().buildSessionFactory();
Session s = factory.openSession();
s.beginTransaction();
s.saveOrUpdate(p);
s.close();
现在，只要没有两首歌曲具有相同的 id，这就可以了。
正如您在图片中看到的那样，当事情不重叠时，一切都会保存好。但是，如果我尝试将已经使用的 song_id 转换为新的 playlist_id，事情就会爆炸并抛出：
Exception in thread "AWT-EventQueue-0" org.hibernate.exception.ConstraintViolationException: could not execute statement
at org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java:74)
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:49)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:125)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:110)
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:136)
at org.hibernate.engine.jdbc.batch.internal.NonBatchingBatch.addToBatch(NonBatchingBatch.java:58)
at org.hibernate.persister.collection.AbstractCollectionPersister.recreate(AbstractCollectionPersister.java:1256)
at org.hibernate.action.internal.CollectionRecreateAction.execute(CollectionRecreateAction.java:58)
at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:393)
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:385)
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:307)
at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:339)
at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:52)
at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1240)
at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:404)
at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.beforeTransactionCommit(JdbcTransaction.java:101)
at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.commit(AbstractTransactionImpl.java:175)
at com.titanplayer.persistence.Database.save(Database.java:35)
at com.titanplayer.gui.PlayerGUI.newPlaylistButtonActionPerformed(PlayerGUI.java:441)
at com.titanplayer.gui.PlayerGUI.access$2200(PlayerGUI.java:47)
at com.titanplayer.gui.PlayerGUI$8.actionPerformed(PlayerGUI.java:321)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6505)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
at java.awt.Component.processEvent(Component.java:6270)
at java.awt.Container.processEvent(Container.java:2229)
at java.awt.Component.dispatchEventImpl(Component.java:4861)
at java.awt.Container.dispatchEventImpl(Container.java:2287)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
at java.awt.Container.dispatchEventImpl(Container.java:2273)
at java.awt.Window.dispatchEventImpl(Window.java:2719)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:729)
at java.awt.EventQueue.access$200(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:688)
at java.awt.EventQueue$3.run(EventQueue.java:686)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.awt.EventQueue$4.run(EventQueue.java:702)
at java.awt.EventQueue$4.run(EventQueue.java:700)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:699)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
Caused by: java.sql.SQLIntegrityConstraintViolationException: integrity constraint violation: unique constraint or index violation; UK_Q3MYU734MY659N16AROSDTO8P table: PLAYLIST_SONG
at org.hsqldb.jdbc.JDBCUtil.sqlException(Unknown Source)
at org.hsqldb.jdbc.JDBCUtil.sqlException(Unknown Source)
at org.hsqldb.jdbc.JDBCPreparedStatement.fetchResult(Unknown Source)
at org.hsqldb.jdbc.JDBCPreparedStatement.executeUpdate(Unknown Source)
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:133)
我假设这是由于我对映射的了解不足。谁能帮我解决这个问题？
【问题讨论】：
-
为什么列表中不同歌曲的歌曲ID相同？有什么原因吗？