异常:Batch update returned unexpected row count from update [0]; actual row count: 0;

使用了hibernate的主键生成策略，而在程序中又主动去设置了主键值。<class name="ProductRegion" table="PRODUCT_REGION" lazy="false">        <id name="id" column="PRODUCT_REGION_ID">            <generator class="native" />        </id>            <many-to-one class = "gira.domain.place.Region" name="region" column="PRODUCT_REGION_REGION_ID" />        <many-to-one class = "Product" name="product" column="PRODUCT_REGION_PRODUCT_ID" ></many-to-one>        <property name="index" column="PRODUCT_REGION_INDEX" /></class>程序中：for(Long l:regionIds){                Region region=regionDao.findById(l);                ProductRegion productRegion=new ProductRegion();                productRegion.setProduct(product);                productRegion.setRegion(region);                productRegion.setId(i);                i++;                productRegions.add(productRegion);}从而出现异常了

转载于:https://www.cnblogs.com/mjbrian/p/7531706.html