deleted object would be re-saved by cascade

解决hibernate 删除异常： deleted object would be re-saved by cascade (remove deleted object from associations)
在hibernate 删除关联时会出现eleted object would be re-saved by cascade (remove deleted object from associations)的异常，结合别人的和自己的经验通常有三种解决的方案：

方法1 删除Set方的cascade：
方法2 解决关联关系后，再删除

    onside.getManys().remove(thisMany);   //在所关联的一方的set中移走当前要删除的对象
    thisMany.setOne(null);                          //设置所对应的一方为空，解除它们之间的关系
    manyDao.delete(thisMany);
方法3 在many-to-one方增加cascade 但值不能是none