多表关联 :
多对多:
<!-- 多表级联查询 -->
<select id="selectMobileUserDetail" resultMap="MobileUserBeanRes">
select
c.*,
d.*,
u.*
from
crownmobileuser c,
user_productdetail u,
crownproductdetail d
where c.id = u.mobileuserid and u.productdetailid = d.id and c.username = #{username}
</select>
<resultMap type="com.proxy.crown.bean.MobileUserBeanRes" id="MobileUserBeanRes">
<result property="id" column="user_id" />
<result property="username" column="username" />
<result property="password" column="password" />
<result property="identifycode" column="identifycode" />
<collection property="mobileUserProductBeans" javaType="java.util.List" ofType="com.proxy.crown.bean.MobileUserProductBean">
<id property="id" column="userproduct_id" />
<result property="productdetailid" column="productdetailid" />
<result property="mobileuserid" column="mobileuserid" />
</collection>
<collection property="resultData" javaType="java.util.List" ofType="com.proxy.crown.bean.ProductDetailBean">
<id property="id" column="product_id" />
<result column="productdetailname" property="productdetailname" jdbcType="VARCHAR" />
<result column="productdetailrelationtype" property="productdetailrelationtype" jdbcType="VARCHAR" />
<result column="productdetailsupplier" property="productdetailsupplier" jdbcType="VARCHAR" />
<result column="productdetailsupplierphone" property="productdetailsupplierphone" jdbcType="VARCHAR" />
<result column="productdetaildistributor" property="productdetaildistributor" jdbcType="VARCHAR" />
<result column="productdetailtype" property="productdetailtype" jdbcType="VARCHAR" />
<result column="productdetailhandlingperson" property="productdetailhandlingperson" jdbcType="VARCHAR" />
<result column="productdetailaddress" property="productdetailaddress" jdbcType="VARCHAR" />
<result column="productdetaildesc" property="productdetaildesc" jdbcType="VARCHAR" />
<result column="productdetailnum" property="productdetailnum" jdbcType="VARCHAR" />
<result column="productid" property="productid" jdbcType="INTEGER" />
<result column="productname" property="productname" jdbcType="VARCHAR" />
</collection>
</resultMap>