A query was run and no Result Maps were found
使用mybatis时出现异常问题：
有如下的错误
Error querying database. Cause: org.apache.ibatis.executor.ExecutorException: A query was run and no Result Maps were found for the Mapped Statement
（后面内容省略）
网上说是oracle不允许插入空值。
但是我没有进行插入操作的，只是进行了查询。
后来看看mybatis的配置文件，漏了一项：resultType属性值
原来的配置是：<select id="countSiteInv" parameterType="Map">
修改之后的配置<select id="countSiteInv" resultType="CamelCaseKeyMap" parameterType="Map">
mybatis中不管什么查询，都必须返回resultType或者resultMap的值，否则就会报错的。
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