oracle10g数据库，hibernate写入clob字段时，数据量小时，可以正常写入，数据量大时，报如下错误

hibernate的xml配置batch_size配为0了，对象的hibernate的属性里也加过length="100000"了，都没效果
2011-12-08 15:48:37,390  WARN (JDBCExceptionReporter.java:71) - SQL Error: 17090, SQLState: null
2011-12-08 15:48:37,390 ERROR (JDBCExceptionReporter.java:72) - 不允许的操作: streams type cannot be used in batching
2011-12-08 15:48:37,406 ERROR (AbstractFlushingEventListener.java:299) - Could not synchronize database state with session