问题描述
有没有办法对 SQL 表中的一行进行 md5sum 来检查是否有任何列被修改?
Is there a way to md5sum a row in a SQL table to check whether any column has been modified?
我想检查是否有任何特定列与我保存在文本文件中的数据的旧副本(我将在 C# 中使用 md5sum)进行了更改.
I would like to check whether any particular column has been changed versus an old copy of the data which i hold in a text file (which I will md5sum in C#).
每行只需 md5sum-ing
Just md5sum-ing each row
推荐答案
有CHECKSUM(*)、BINARY_CHECKSUM(*) 和 CHECKSUM_AGG.他们像校验一样执行 CRC32，但是为了检测行的变化，它应该绰绰有余(你说的是 40 亿分之一的假阴性碰撞机会).
There are CHECKSUM(*), BINARY_CHECKSUM(*) and CHECKSUM_AGG. They do CRC32 like checkum, but for detecting changes to a row it should be more than enough (you are talking about 1 in 4 billion chances for a false negative collision).
使用 HASHBYTES 进行加密哈希需要您构造表示行"的表达式.
Doing a cryptographic hash using HASHBYTES requires you to construct an expression representing the 'row'.
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