MyBatis的Map中放集合对象（为了in操作等）的小提示
MyBatis是SQLMap类型的数据库访问层，使用见：ibatis 开发指南这里记录一点：为了通用性，需要Map作为Parameter Class，其中有元素filedList是一个List，即MParameter Class为Map，且Map中有集合、数组、Iterator等元素时，出现下面问题：
对于Map中取得集合对象，进行iterate时，如
<select id="findRecordsByFileIdList" parameterClass="java.util.Map" resultMap="EboxFileResultMap">
select id,file_name,parent,physical_symbol,status,type,gmt_modify,length,suffix,owner
from ebox_fs$SHARD_INDEX$
where id in <iterate open="(" close=")" conjunction=",">
#fileIdList[]#
</iterate>
and status > 0 order by type desc, file_name asc, gmt_modify desc
</select>会报错，Cause: com.ibatis.sqlmap.client.SqlMapException: ParameterObject or property was not a Collection, Array or Iterator. 进行如下配置（红色部分）：
<select id="findRecordsByFileIdList" parameterClass="java.util.Map" resultMap="EboxFileResultMap">
select id,file_name,parent,physical_symbol,status,type,gmt_modify,length,suffix,owner
from ebox_fs$SHARD_INDEX$
where id in <iterate open="(" close=")" conjunction="," property="fileIdList">
#fileIdList[]#
</iterate>
and status > 0 order by type desc, file_name asc, gmt_modify desc
</select>
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