springMVC学习(4)-商品修改(RequestMapping解释、controller返回值)

一、需求：

操作流程：

1、进入商品查询列表页面

2、点击修改，进入商品修改页面，页面中显示了要修改的商品（从数据库查询）

3、在商品修改页面，修改商品信息，修改后，点击提交

代码：

ItemsMapper.xml：--使用的是逆向工程生成的：

 1 <mapper namespace="com.cy.mapper.ItemsMapper" >
 2 <sql id="Base_Column_List" >
 3     id, name, price, pic, createtime
 4   </sql>
 5 <sql id="Blob_Column_List" >
 6     detail
 7   </sql>
 8  <resultMap id="BaseResultMap" type="com.cy.po.Items" >
 9     <id column="id" property="id" jdbcType="INTEGER" />
10     <result column="name" property="name" jdbcType="VARCHAR" />
11     <result column="price" property="price" jdbcType="REAL" />
12     <result column="pic" property="pic" jdbcType="VARCHAR" />
13     <result column="createtime" property="createtime" jdbcType="TIMESTAMP" />
14   </resultMap>
15  <resultMap id="ResultMapWithBLOBs" type="com.cy.po.Items" extends="BaseResultMap" >
16     <result column="detail" property="detail" jdbcType="LONGVARCHAR" />
17   </resultMap>
18   <select id="selectByPrimaryKey" resultMap="ResultMapWithBLOBs" parameterType="java.lang.Integer" >
19     select 
20     <include refid="Base_Column_List" />
21     ,
22     <include refid="Blob_Column_List" />
23     from items
24     where id = #{id,jdbcType=INTEGER}
25   </select>
26 
27 <update id="updateByPrimaryKeyWithBLOBs" parameterType="com.cy.po.ItemsCustom" >
28     update items
29     set name = #{name,jdbcType=VARCHAR},
30       price = #{price,jdbcType=REAL},
31       pic = #{pic,jdbcType=VARCHAR},
32       createtime = #{createtime,jdbcType=TIMESTAMP},
33       detail = #{detail,jdbcType=LONGVARCHAR}
34     where id = #{id,jdbcType=INTEGER}
35   </update>
36 </mapper>

ItemsService.java:

 1 public interface ItemsService {
 2     
 3     public List<ItemsCustom> findItemsList(ItemsQueryVo itemsQueryVo) throws Exception;
 4     
 5     //根据id查询商品信息
 6     public ItemsCustom    findItemsById(Integer id) throws Exception;
 7     
 8     //修改商品信息
 9     public void updateItems(Integer id, ItemsCustom itemsCustom) throws Exception; 
10 }

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