ibatis Map作为resultClass時，必須指定具体的实现类

<select id="getselectedcommondityinfos" parameterClass="map" resultClass="map">

SELECT *

FROM commondity_info c

WHERE comstate_id != 4

<isNotNull property="comIds" prepend=" and com_id in ">

<iterate property="comIds" conjunction="," close=")" open="(">

#comIds[]#

</iterate>

</isNotNull>

</select>

在执行的时候报错：

Cause: java.lang.RuntimeException: JavaBeansDataExchange could not instantiate result class. Cause: java.lang.InstantiationException: java.util.Map; nested exception is com.ibatis.common.jdbc.exception.NestedSQLException:

注意：Map作为resultClass時，必須指定具体的实现类，比如java.util.HashMap,否则会报错

Caused by: java.lang.RuntimeException: JavaBeansDataExchange could not instantiate result class. Cause: java.lang.InstantiationException: java.util.Map

解决办法：

<select id="getselectedcommondityinfos" parameterClass="map" resultClass="java.util.HashMap">

SELECT *

FROM commondity_info c

WHERE comstate_id != 4

<isNotNull property="comIds" prepend=" and com_id in ">

<iterate property="comIds" conjunction="," close=")" open="(">

#comIds[]#

</iterate>

</isNotNull>

</select>