【Ibatis】（十）、xmlResultName详解

如何将查询结果集映射为xml格式的数据？

映射文件：

 <!--mappingtoxmldata-->
 <selectid="selectXmlData"resultClass="xml"xmlResultName="Product"parameterClass="int">
 <![CDATA[
 select*fromt_productwhereprd_id=#value#
 ]]>
 </select>
 <selectid="selectXmlDatas"resultClass="xml"xmlResultName="Product">
 <![CDATA[
 selectprd_idasid,
 prd_descriptionasdescription,
 prd_priceasprice
 fromt_product
 ]]>
 </select>
 <!--ENDmappingtoxmldata-->

DAO层：

 publicObjectgetXmlData(intid)throwsSQLException{
 init();
 Objectobj=(Object)sqlMapClient.queryForObject("selectXmlData",id);
 returnobj;
 }


 publicListgetXmlDatas()throwsSQLException{
 init();
 Listlist=(List)sqlMapClient.queryForList("selectXmlDatas");
 returnlist;
 }

测试类：

 publicclassProductTest{

 ProductDAOproductDao=newProductDAOImpl();

 publicstaticvoidmain(String[]args)throwsSQLException{
 ProductTestptest=newProductTest();
 ptest.getXmlData(1);
 System.out.println("-------------------");
 ptest.getXmlDatas();
 }

 /**
 *获得XML格式的数据
 *@throwsSQLException
 */
 publicvoidgetXmlData(intid)throwsSQLException{
 //查找t_product表，将其结果映射到xml！
 //返回值是xml形式的字符串
 Objectobj=(Object)productDao.getXmlData(1);
 if(objinstanceofProduct){
 System.out.println("returntypeisProduct");
 }elseif(objinstanceofString){
 System.out.println("returntypeisString");
 }else{
 System.out.println("returntypeisunknow");
 }
 System.out.println(obj);
 }

 publicvoidgetXmlDatas()throwsSQLException{
 Listlist=(List)productDao.getXmlDatas();
 Iteratori=list.iterator();
 while(i.hasNext()){
 Objectobj=i.next();
 System.out.println(obj.getClass());
 }
 System.out.println(list);
 }
 }

结果：

return type is String
<?xml version="1.0" encoding="UTF-8"?>

<Product>

<prd_id>1</prd_id>

<prd_description>basketball</prd_description>

<prd_price>206.99</prd_price>

</Product>
-------------------
class java.lang.String
class java.lang.String
[<?xml version="1.0" encoding="UTF-8"?>

<Product>

<id>1</id>

<description>basketball</description>

<price>206.99</price>

</Product>,

<?xml version="1.0" encoding="UTF-8"?>

<Product>

<id>2</id>

<description>football</description>

<price>106.99</price>

</Product>]