mysql上的Grails事务setSavePoint方法导致异常

Question

我在 mysql 5 中使用 grails。我在服务中使用 .withTransaction 进行事务管理。在 withTransaction 块中，我使用了导致以下异常的 savePoint() 方法。注意：我使用 setRollbackOnly() 方法没有任何问题。

2011-06-26 23:02:37,818 [quartzScheduler_Worker-7] ERROR listeners.ExceptionPrinterJobListener  - Exception occured in job: GRAILS_JOBS.com.exmp.bdg.PowerRollupJob
org.quartz.JobExecutionException: Transaction manager does not allow nested transactions [See nested exception: org.springframework.transaction.NestedTransactionNotSupportedException: Transaction manager does not allow nested transactions]
    at org.codehaus.groovy.grails.plugins.quartz.GrailsJobFactory$GrailsTaskClassJob.execute(GrailsJobFactory.java:81)
    at org.quartz.core.JobRunShell.run(JobRunShell.java:199)
    at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:546)
Caused by: org.springframework.transaction.NestedTransactionNotSupportedException: Transaction manager does not allow nested transactions
    at org.springframework.jdbc.datasource.JdbcTransactionObjectSupport.getConnectionHolderForSavepoint(JdbcTransactionObjectSupport.java:151)
    at org.springframework.jdbc.datasource.JdbcTransactionObjectSupport.createSavepoint(JdbcTransactionObjectSupport.java:104)
    at org.springframework.transaction.support.AbstractTransactionStatus.createSavepoint(AbstractTransactionStatus.java:176)
    at org.springframework.transaction.SavepointManager$createSavepoint.call(Unknown Source)
    at com.exmp.bdg.service.PowerRollupService$_doRollup_closure2.doCall(PowerRollupService.groovy:85)

Answer 1

默认情况下，hibernate 和 MySQL 的事务管理器没有启用保存点。

在 BootStrap.groovy 中添加以下内容：

transactionManager.setNestedTransactionAllowed(true)

然后在一个事务中你可以执行以下操作：

Thing.withTransaction { status ->
  //Do some work and a save
  def savePoint = status.createSavepoint()
  //do other work
  if(checkOk)
  {
    //Everything worked so don't need the save point anymore
    status.releaseSavepoint(savePoint)
  }
  else
  {
    //The other work did not work so rollback from it.
    status.rollbackToSavepoint(savePoint)
  }

}