list分批保存到另一个list

import lombok.extern.slf4j.Slf4j;

import java.util.List;

@Slf4j
public final class BatchOperator {

    private BatchOperator() {
    }

    /**
     * 批量操作
     *
     * @param pageSize
     * @param list
     * @param callback
     * @param <T>
     * @return
     */
    public static <T> int operate(int pageSize, List<T> list, Callback callback) {

        int total = list.size();
        int pages = total <= pageSize ? 1 : total % pageSize == 0 ? total / pageSize : total / pageSize + 1;
        try {
            for (int i = 0; i < pages; i++) {
                if ((i + 1) * pageSize <= total) {
                    callback.execute(list.subList(i * pageSize, (i + 1) * pageSize));
                } else {
                    callback.execute(list.subList(i * pageSize, total));
                }
            }
            return 1;
        } catch (Exception e) {
            log.error("操作出错：{}", e);
        }
        return 0;
    }

    public static interface Callback<T> {
        void execute(List<T> list);
    }
}

工作中看别人写的代码。。。l留个记录

用法： 1000条一次复制

if(CollUtil.isNotEmpty(updateList)) {
    long start = System.currentTimeMillis();
    BatchOperator.operate(1000, updateList, (itemList) -> {
        offipoStockIpoInfoMapper.batchUpdate(itemList);
    });
    log.info("分批更新完成，耗时:{}", (System.currentTimeMillis() - start) / 1000 );
}

标签：int,分批,List,保存,param,list,BatchOperator,1000
来源： https://blog.csdn.net/qq_41831842/article/details/121417698