this post was submitted on 11 Oct 2023

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Programming

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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 1 year ago* (last edited 1 year ago) by [email protected] to c/programming

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"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.

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[–] [email protected] 13 points 1 year 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.

[–] [email protected] 2 points 1 year ago (1 children)

Yup, exact tip I was gonna write!

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

[–] [email protected] 1 points 1 year ago

Great minds think alike :)