2
我有兩個表的數據庫模型：Session和ScriptExecution其間用一個一對多的關係有關：Spring/Hibernate：你需要在保存後加載實體才能使用它嗎？
public class ScriptExecution implements Serializable {
@ManyToOne
@PrimaryKeyJoinColumn
private Session session;
...
}
public class Session implements Serializable {
@OneToMany(fetch=FetchType.EAGER, mappedBy="session")
private Set<ScriptExecution> scriptExecutions;
...
}
如果我創建一個會話，加載它，並把它分配給一個腳本執行一切正常精細：
Session session = new Session();
sessionDao.save(session);
session = sessionDao.load(1);
ScriptExecution scriptExecution = new ScriptExecution();
ScriptExecution.setSession(session);
scriptExecutionDao.save(scriptExecution);
如果我使用創建的會話直接將其如下分配給ScriptExecution：
Session session = new Session();
sessionDao.save(session);
ScriptExecution scriptExecution = new ScriptExecution();
ScriptExecution.setSession(session);
scriptExecutionDao.save(scriptExecution);
Hibernate的失敗，出現以下錯誤：
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.dao.DataIntegrityViolationException: Could not execute JDBC batch update; SQL [insert into script_execution (end, session_id, start, id) values (?, ?, ?, ?)]; constraint [null]; nested exception is org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:656)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
root cause
org.springframework.dao.DataIntegrityViolationException: Could not execute JDBC batch update; SQL [insert into script_execution (end, session_id, start, id) values (?, ?, ?, ?)]; constraint [null]; nested exception is org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update
org.springframework.orm.hibernate3.SessionFactoryUtils.convertHibernateAccessException(SessionFactoryUtils.java:637)
org.springframework.orm.hibernate3.HibernateTransactionManager.convertHibernateAccessException(HibernateTransactionManager.java:793)
org.springframework.orm.hibernate3.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:664)
org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:754)
org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:723)
org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:147)
com.sc2.web.controller.MainController.handleRequest(MainController.java:45)
org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:774)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
root cause
org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update
org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:94)
org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:275)
org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:266)
org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:167)
org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)
org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:50)
org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1028)
org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:366)
org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:137)
org.springframework.orm.hibernate3.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:656)
org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:754)
org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:723)
org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:147)
com.sc2.web.controller.MainController.handleRequest(MainController.java:45)
org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:774)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
root cause
java.sql.BatchUpdateException: Cannot add or update a child row: a foreign key constraint fails (`sc2`.`script_execution`, CONSTRAINT `fk_script_execution_session1` FOREIGN KEY (`session_id`) REFERENCES `session` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION)
com.mysql.jdbc.PreparedStatement.executeBatchSerially(PreparedStatement.java:2020)
com.mysql.jdbc.PreparedStatement.executeBatch(PreparedStatement.java:1451)
org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:70)
org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:268)
org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:266)
org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:167)
org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)
org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:50)
org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1028)
org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:366)
org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:137)
org.springframework.orm.hibernate3.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:656)
org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:754)
org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:723)
org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:147)
com.sc2.web.controller.MainController.handleRequest(MainController.java:45)
org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:774)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
我也試圖把代碼在一個事務中，但代碼失敗，出現同樣的錯誤。
TransactionTemplate template = new TransactionTemplate(transactionManager);
template.execute(new TransactionCallbackWithoutResult() {
@Override
protected void doInTransactionWithoutResult(TransactionStatus arg0) {
Session session = new Session();
sessionDao.save(session);
ScriptExecution scriptExecution = new ScriptExecution();
scriptExecution.setSession(session);
scriptExecutionDao.save(scriptExecution);
}
});
你有什麼想法是怎麼回事？我不能相信我必須在創建它們之後加載創建的實體。
然後你應該接受你自己的回答 – 2010-09-01 08:46:24
你應該知道這隻有在兩天內纔有可能。 – Erik 2010-09-01 08:48:18