我每天会下载一个txt的记录文件（过去7天的记录）导入到数据库，txt文件里面大概有2000多条记录，其中80%都是数据库已存在的，只20%左右的数据是新数据，我现在是直接循环读取txt文件写入到数据库，重复的就会失败，但感觉这样效率太低了，请问有没有比较高效一点的方法？
回复讨论(解决方案)
txt中新数据是固定添加在文件尾，还是随机穿插在老数据中？
已知数据是过去7天的，那么可从
1、数据库中读取开始日期之后的数据到数组
2、读取数据文件到数组
3、对两数组求一个差集
4、将差集插入数据库
把这个导进去一个新表...
然后 写sql 批量insert into ,
条件的时候写where not in (select 主键那些 form txt文件导入的新表)
希望能帮到你!
1 从数据库中读取文件到一个txt文件old.txt
2 读取old.txt文件行数
3 从new.txt文件指定行数开始读取
仅供参考.
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