Hibernate级联实践之四（复合主键）

 一。mapping

这里使用两张表，分别为TBL_OSU_PRODUCTFILTERDETAIL_I和TBL_OSU_PRODUCTFILTER_I，前者为复合主键，后者与前者为一对多的关系。

1.TBL_OSU_PRODUCTFILTERDETAIL_I

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
    <class name="com.netqin.function.osuproduct.filter.model.ProductFilterDeatil" table="TBL_OSU_PRODUCTFILTERDETAIL_I" schema="OSU_WORK">
        <composite-id name="id" class="com.netqin.function.osuproduct.filter.model.ProductFilterDeatilId">
            <key-many-to-one name="filter" entity-name="com.netqin.function.osuproduct.filter.model.ProductFilter" lazy="false">
             <column name="PFDE_PRFIID_FK"></column>
            </key-many-to-one>
             <key-many-to-one name="product" entity-name="com.netqin.function.osuproduct.product.model.OsuProduct" lazy="false">
             <column name="PFDE_PRDUID_FK"></column>
            </key-many-to-one>
           
        </composite-id>
        <property name="pfdeOrder" type="java.lang.Long">
            <column name="PFDE_ORDER" precision="10" scale="0" not-null="true" />
        </property>
    </class>
</hibernate-mapping>

 

说明：该表为复合主键，且每个字段与其它表为many-to-one关系，这样做方便在页面中直接使用关联对象，注意lazy="false"。

 

2.TBL_OSU_PRODUCTFILTER_I

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
    <class name="com.netqin.function.osuproduct.filter.model.ProductFilter" table="TBL_OSU_PRODUCTFILTER_I" schema="OSU_WORK">
        <id name="prfiId" type="java.lang.Long">
            <column name="PRFI_ID" precision="10" scale="0" />
            <generator class="sequence">
             <param name="sequence">SEQ_OSU_PRODUCTFILTER_I</param>
            </generator>
        </id>
        <property name="prfiBusiidFk" type="java.lang.String">
            <column name="PRFI_BUSIID_FK" length="10" not-null="true" />
        </property>
          
  <set name="productFilterDetailes" cascade="all-delete-orphan" inverse="true" lazy="false">
   <key column="PFDE_PRFIID_FK"/>
   <one-to-many class="com.netqin.function.osuproduct.filter.model.ProductFilterDeatil"/>
  </set>
       
    </class>
</hibernate-mapping>

 

说明：这里说明即便是复合主键，也可以使用one-to-many只关联其中的一个字段。

 

二。操作方法

1.新增

      ProductFilter pf = new ProductFilter();
      pf.setPrfiBusiidFk(business[i]);      
      
      //筛选明细
      for(int j=0;j<par.length;j++){
        tem = par[j].split(",");//相应的子表属性，这里仅为举例
        ProductFilterDeatil pfd = new ProductFilterDeatil();
        ProductFilterDeatilId pfdfk = new ProductFilterDeatilId();//复合主键对象
        OsuProduct product = (OsuProduct)dao.findById(OsuProduct.class, Long.parseLong(tem[0]));
        pfdfk.setFilter(pf);
        pfdfk.setProduct(product);
        
        pfd.setId(pfdfk);//封装复合主键
        pfd.setPfdeOrder(Long.parseLong(tem[2]));
        pf.getProductFilterDetailes().add(pfd);
      }

    dao.save(pf );
      
2.修改和删除方法与many-to-one类似，不在赘述。

 

这里需要注意的是，复合主键是不能重复的，所以在新增或修改时需要做异常处理，或在前台做控制。