5.25总结
<resultMap id="brandResultMap" type="com.itheima.pojo.Brand">
<result column="brand_name" property="brandName"/>
<result column="brand_name" property="companyName"/>
</resultMap>
<select id="selectAll" resultType="com.itheima.pojo.Brand">
select * from tb_brand;
</select>
<!--
* 参数占位符：
1：#{} :
2. ${} :
-->
<select id="selectById" resultMap="brandResultMap">
select * from tb_brand where id = #{id};
</select>