oracle+mybatis 使用动态Sql当插入字段不确定的情况下实现批量insert

<insert id="batchInsertLine" parameterType="HashMap"> 
   <![CDATA[ 
   INSERT INTO tg_fcst_lines(${lineColumn}) 
   select result.*,sq_fcst_lines.nextval from( 
   ]]> 
   <foreach collection="lineList" item="item" index="index" separator="union all" > 
    (select   
    <foreach collection="item" index="key" item="_value" separator=","> 
      #{_value} 
    </foreach>  
    from dual) 
   </foreach> 
   <![CDATA[) result]]>   
 </insert> 

Map insertMap = new HashMap(); 
insertMap.put("lineColumn",lineColumn);    
insertMap.put("lineList", lineList); 

List<Map> lineList = new ArrayList(); 

String lineColumn = "";  //拼接的SQL,作为insert语句的一部分 
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Map<String,String> lineMap = lineList.get(0); 
for (String key : lineMap.keySet()) { 
  lineColumn +=key+","; 
} 
lineColumn +="LINE_ID";