this post was submitted on 11 Oct 2023
354 points (97.6% liked)

Programming

16421 readers
634 users here now

Welcome to the main community in programming.dev! Feel free to post anything relating to programming here!

Cross posting is strongly encouraged in the instance. If you feel your post or another person's post makes sense in another community cross post into it.

Hope you enjoy the instance!

Rules

Rules

  • Follow the programming.dev instance rules
  • Keep content related to programming in some way
  • If you're posting long videos try to add in some form of tldr for those who don't want to watch videos

Wormhole

Follow the wormhole through a path of communities !webdev@programming.dev

founded 1 year ago
MODERATORS
snowe@programming.dev
Ategon@programming.dev
MaungaHikoi@lemmy.nz
354
I accidentally removed the WHERE clause from my SQL query in a personal tool. Every row is now the same. I overwrote 206,000+ rows. I have no backup, I am stupid. (lemmy.world)
submitted 9 months ago* (last edited 9 months ago) by drekly@lemmy.world to c/programming@programming.dev
113 comments fedilink hide all child comments
 

"UPDATE table_name SET w = $1, x = $2, z = $4 WHERE y = $3 RETURNING *",

does not do the same as

"UPDATE table_name SET w = $1, x = $2, y = $3, z = $4 RETURNING *",

It's 2 am and my mind blanked out the WHERE, and just wanted the numbers neatly in order of 1234.

idiot.

FML.

you are viewing a single comment's thread
view the rest of the comments
[โ€“] Jambone@lemmy.world 11 points 9 months ago (1 children)

In MSSQL, you can do a BEGIN TRAN before your UPDATE statement.

Then if the number of affected rows is not about what you'd expect, doing a ROLLBACK would undo the changes.

If the number of affected rows did look about right, doing a COMMIT would make the changes permanent.

[โ€“] lobut@lemmy.ca 2 points 9 months ago

Yup, exact tip I was gonna write!

I have them commented out and highlight the COMMIT when I'm ready.