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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 10 months ago* (last edited 10 months ago) by drekly@lemmy.world to c/programming@programming.dev
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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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[-] SuperFola@programming.dev 27 points 10 months ago

There is still the journal you could use to recover the old state of your database. I assume you commited after your update query, thus you would need to copy first the journal, remove the updates from it, and reconstruct the db from the altered journal.

This might be harder than what I'm saying and heavily depends on which db you used, but if it was a transactional one it has to have a journal (not sure about nosql ones).

[-] drekly@lemmy.world 4 points 10 months ago

It is after the event that I find that postgres' WAL journalling is off by default ๐Ÿ™ƒ

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

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