基于mybatis batch实现批量提交大量数据

<insert id="insertBatch2" parameterType="ctas.entity.SharkFlt">
   <selectKey keyProperty="recId" order="BEFORE" resultType="Long">
   select SEQ_CTAS_SHARK_FLT.nextval as recId from dual
  </selectKey>
   insert into CTAS_SHARK_FLT (<include refid="Base_Column_List"/>) SELECT SEQ_TEST.NEXTVAL, A.*
   FROM (
   <foreach collection="list" item="item" index="index" open="" close="" separator="union all">
    select #{item.awbType,jdbcType=VARCHAR}, #{item.awbPre,jdbcType=VARCHAR},... from dual
 </foreach>
  ) A
 </insert>

List<SharkFlt> data = new ArrayList<SharkFlt>();
     for (TSharkFlt f : sharkFlts) {
       data.add(getSharkFlt(f));
     }
 
    System.out.println(data.size());
     long beginTime = System.currentTimeMillis();
    System.out.println("开始插入...");
     SqlSessionFactory sqlSessionFactory 
=ctx.getBean(SqlSessionFactory.class);
     SqlSession session = null;
    try {
       session = sqlSessionFactory.openSession(ExecutorType.BATCH, false);
       int a = 2000;//每次提交2000条
       int loop = (int) Math.ceil(data.size() / (double) a);
 
       List<SharkFlt> tempList = new ArrayList<SharkFlt>(a);
      int start, stop;
      for (int i = 0; i < loop; i++) {
        tempList.clear();
        start = i * a;
        stop = Math.min(i * a + a - 1, data.size() - 1);
        System.out.println("range:" + start + " - " + stop);
        for (int j = start; j <= stop; j++) {
           tempList.add(data.get(j));
        }
         session.insert("ctas.importer.writer.mybatis.mappper.SharkFltMapper.insertBatch2", tempList);
        session.commit();
        session.clearCache();
         System.out.println("已经插入" + (stop + 1) + " 条");
       }
     } catch (Exception e) {
       e.printStackTrace();
       session.rollback();
    } finally {
      if (session != null) {
        session.close();
      }
     }
    long endTime = System.currentTimeMillis();
    System.out.println("插入完成，耗时 " + (endTime - beginTime) + " 毫秒！");