使用resultMap实现ibatis复合数据结构查询(1.多重属性查询;2.属性中含有列表查询)

以订单为例(订单详情包括了订单的基本信息,配送物流信息,商品信息),直接上代码:

1.多重属性查询

java实体

public class OrderDetail {

@XmlElement(required = true)
protected String orderSn;
@XmlElement(required = true)
protected String orderAmount;
@XmlElement(required = true)
protected String orderStatus;
@XmlElement(required = true)
protected String orderAddTime;
@XmlElement(required = true)
protected Logistics logistics;
@XmlElement(required = true)
protected OrderGoods orderGoods;
@XmlElement(required = true)
protected List<OrderDetail> listData;
<pre name="code" class="java">      ... getter and setter...

}

class="orderDetail" 即为上面的类,有个属性logistics的类型是复合类型Logistics

以下是订单详情的resultMap:

<resultMap id="OrderInfoMap" class="orderDetail">
<result property="orderSn" column="orderSn"/>
<result property="orderAmount" column="orderAmount"/>
<result property="orderStatus" column="orderStatus"/>
<result property="orderStatus" column="orderAddTime"/>

<result property="logistics.consignee" column="consignee"/>
<!--  <result property="logistics.receiver" column="receiver"/> -->
<result property="logistics.country" column="country"/>
<result property="logistics.province" column="province"/>
<result property="logistics.city" column="city"/>
<result property="logistics.district" column="district"/>
<result property="logistics.address" column="address"/>
<result property="logistics.mobile" column="mobile"/>
<result property="logistics.shippingName" column="shippingName"/>

<result property="orderGoods.listData" select="wxShopOrder.getOrderGoodsList"
column="orderSn"/>
</resultMap>

当中"<result property="logistics.consignee" column="consignee"/> ",logistics.consignee就能够用对象訪问的写法来查询,consignee是logistics的属性,logistics是orderDetail的属性.注意:column的名称应该与sql语句查询的列名一致.

sql查询语句例如以下:

<select id="getOrderDetail" parameterClass="string" resultMap="OrderInfoMap" >
select
order_sn as orderSn,
order_amount as orderAmount,
order_status as orderStatus,
add_time as orderAddTime,
consignee,
country,

b.region_name province,
c.region_name city,
d.region_name district,
address,
mobile,
shipping_name as shippingName

from  ecs_order_info  o
left join ecs_region b on o.province=b.region_id
left join ecs_region c on o.city=c.region_id
left join ecs_region d on o.district=d.region_id
where  order_sn=#orderSn#
</select>

2.属性中含有列表查询

orderDetail有个属性orderGoods的类型是List复合类型,应在resultMap的属性定义中加入属性select="getOrderGoodsList",getOrderGoodsList也是一个sql查询

<result property="orderGoods.listData" select="wxShopOrder.getOrderGoodsList" column="orderSn"/>

注意:上面column="orderSn"指的是orderSn作为sql的查询參数. 看下这个 getOrderGoodsList查询

<!-- 通过订单号获取订单商品列表 -->
<select id="getOrderGoodsList" parameterClass="string" resultMap="orderGoodsMap">
select goods_name as goodsName,
goods_number as goodsNumber
from ecs_order_goods where order_id=
(select order_id from ecs_order_info where order_sn=#orderSn#)
</select>