org.apache.ibatis.builder.IncompleteElementException: Could not find parameter map com.vo.app

问题：org.apache.ibatis.builder.IncompleteElementException: Could not find parameter map com.vo.App

解决：

mapper.xml 中

    <select id="selectAppTotal" parameterType="com.vo.App" resultType="java.lang.Integer">       select count(1)        from tl_app_info        WHERE app_code = #{appCode};    </select>

 红色标注部分  注意，不能是paremeterMap