ibatis 动态sql-热谱图（一）

这两天在对数据库的一个表分表：大体功能是做热谱图是有两张表，一张是：area_guest（每天有大量数据会传进来，要分表，大概是3个月要分一次比如area_guest201501，area_guest201504。。。。。以此类推），一张是area_dictionary （主要是商家的区域信息）

原sql是这样的：

<select id="getAreaGustByParam" resultMap="ibatorgenerated_BaseResultMap" parameterClass="java.util.HashMap" >
select * from  area_guest
where area_id in (select ad.id from area_dictionary ad where ad.mall_id=#mallId:INTEGER# and floor_code=#nowFloor:INTEGER#)
<isNotNull  property="startTime" >
and start_time >=#startTime:TIMESTAMP#
</isNotNull>
<isNotNull property="endTime">
and end_time <=#endTime:TIMESTAMP#
</isNotNull>
</select>

分表后想写成的效果是这样：

select area_id,area_guest_num from  area_guest201504
LEFT JOIN    area_dictionary ad
on   area_guest.area_id=ad.id
AND ad.mall_id=1
AND ad.floor_code=1
and area_guest201504.start_time >="2015-06-14 00:00:00"
and area_guest201504.end_time <="2015-07-01 12:00:00"
union
select area_id,area_guest_num from  area_guest201507
LEFT JOIN    area_dictionary ad
on   area_guest201507.area_id=ad.id
AND ad.mall_id=1
AND ad.floor_code=1
and area_guest201507.start_time >="2015-06-14 00:00:00"
and area_guest201507.end_time <="2015-07-01 12:00:00"

问题来了，这是一个静态sql，怎么变成动态的，经过一番努力结果如下：

<select id="getAreaGustByParam2" resultMap="ibatorgenerated_BaseResultMap2" parameterClass="java.util.HashMap" >
<dynamic>
<iterate property="list" conjunction="union">
select area_id,area_guest_num from area_guest$list[].tablename$
LEFT JOIN    area_dictionary ad
on   area_guest$list[].tablename$.area_id=ad.id
<isNotNull property="list">
AND ad.mall_id=#list[].mallId:INTEGER#
</isNotNull>
<isNotNull property="list">
AND ad.floor_code=#list[].nowfloor:INTEGER#
</isNotNull>
<isNotNull property="list">
and area_guest$list[].tablename$.start_time >=#list[].startTime:TIMESTAMP#
</isNotNull>
<isNotNull property="list">
and area_guest$list[].tablename$.end_time <=#list[].endTime:TIMESTAMP#
</isNotNull>
</iterate>
</dynamic>
</select>

还有参数是这样传的map.put(“list”,list)；