Ibatis的parameterMap将Property转换为Column

问题：Ibatis中，由于parameterMap无法将传入的java属性转换为数据库的字段。查了Ibatis的文档，针对Ado.Net是存在column字段的，而针对java没有。搞不明白为什么针对java没有？

Ado.net的配置大致如下,参考：http://developer.51cto.com/art/200907/138508.htm

﹤parameterMap class="Employee" id="Employee_SelectParameterMap"﹥

    ﹤parameter column="EmployeeID" property="EmployeeID" dbType="int" type="int" direction="Input"/﹥

    ﹤parameter column="LastName" property="LastName" dbType="nvarchar" type="string" direction="Input"/﹥

    ﹤parameter column="Country" property="Country" dbType="nvarchar" type="string" direction="Input"/﹥

﹤/parameterMap﹥

Java的parameterMap 配置大致如下：【注意】其中的 $sort$ $dir$，防止ibatis添加"'"

<parameterMap class="java.util.Map" id="paramQueryMap">
    <parameter property="appId" />
    <parameter property="listValue" />
    <parameter property="sort" />
    <parameter property="dir" />
    <parameter property="begin" />
    <parameter property="increment" />
parameterMap>

<select id="getBlackList" resultMap="HummockBlackListResult"
    parameterMap="paramQueryMap">
    SELECT
    <include refid="columns" />

        FROM black_list
    ]]>
    <dynamic prepend="where">
        <isNotEmpty prepend="and" property="appId">
            app_Id = #appId#
        isNotEmpty>
        <isNotEmpty prepend="and" property="listValue">
            list_value =
            #listValue#
        isNotEmpty>
        <isNotEmpty prepend="order by" property="sort">
            $sort$ $dir$
        isNotEmpty>
    dynamic>
    limit #begin#,#increment#
select>

自己写的转换操作的方法如下：

public class PropertyColumnWrapper {
    private static Logger logger = LoggerFactory.getLogger(PropertyColumnWrapper.class);

    public static String getColumn(String property) {
        if (StringUtils.isBlank(property)) {
            logger.warn("property should not null");
            return null;
        }

        StringBuffer buffer = new StringBuffer(property);
        for (int i = 0; i < buffer.length(); i++) {
            char c = buffer.charAt(i);
            if (c >= 'A' && c <= 'Z') {
                //插入'_'之后，位置+1
                buffer.insert(i++, '_');
            }
        }
        return buffer.toString();
    }

    public static String getProperty(String column) {
        if (StringUtils.isBlank(column)) {
            logger.warn("column should not null");
            return null;
        }
        return column.replaceAll("_", "");
    }
}