mybatis batch批量提交大量数据

转载：https://blog.csdn.net/Java_Mr_Zheng/article/details/50476757

在xml文件配置多条参数同时插入：

<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>

在Java代码中，oracle中一次执行的sql语句长度是有限制的，如果最后拼出来的sql字符串过长，会导致执行失败，所以java端还要做一个分段处理，参考下面的处理:

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！");