一、批量更新

 /*** 批量更新的操作* @return*/public int batchUpdate(){List<StudentDo> list = new ArrayList<>(); //要修改的一批数据List<Pair<Query, Update>> updateList = new ArrayList<>(list.size());BulkOperations operations = mongoTemplate.bulkOps(BulkOperations.BulkMode.UNORDERED, "w_test1");list.forEach(data -> {//如果query查询到有数据就更新Query query = new Query(new Criteria("_id").is(data.getId()));Update update = new Update();update.set("stu_name",data.getStuName());update.set("updateTime",data.getUpdateTime());Pair<Query, Update> updatePair = Pair.of(query, update);updateList.add(updatePair);});operations.upsert(updateList);BulkWriteResult result = operations.execute();return result.getModifiedCount();}