1对1关联，保存对象，不更新关联的对象
设置 cascade=“none”
<many-to-one name="proType" class="com.gwideal.jxwpgsh.pojo.SysDictionary" lazy="false" fetch="select" cascade="none" not-found="ignore">
<column name="pro_type" not-null="false" unique="true"/>
</many-to-one>