关于hibernate持久化的问题

[pp1234567333]

我在程序里写了这样一段：
SampleGroup targetGroup = (SampleGroup) session.load(SampleGroup.class, new Integer(targetGroupId));
targetGroup.setSampleIds(sampleid1);
session.update(targetGroup);

SampleGroup sourceGroup = (SampleGroup) session.load(SampleGroup.class, new Integer(sourceGroupId));
sourceGroup.setSampleIds(sampleid2);
session.update(sourceGroup);

结果数据库里的数据发生错误targetGroup对应的记录是正确的，但sourceGroup对应的记录的SampleIds字段是sampleid1不是sampleid2


如果将这段程序改为：
SampleGroup targetGroup = (SampleGroup) session.load(SampleGroup.class, new Integer(targetGroupId));
targetGroup.setSampleIds(sampleid1);
session.flush();

SampleGroup sourceGroup = (SampleGroup) session.load(SampleGroup.class, new Integer(sourceGroupId));
sourceGroup.setSampleIds(sampleid2);
session.flush();

就是正确的了，哪个高手能告诉我为什麽？谢谢

[friendggz]

顶