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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 11 months ago* (last edited 11 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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[–] Blackmist@feddit.uk 41 points 11 months ago (1 children)

You're not the first. You won't be the last. I'm just glad my DB of choice uses transactions by default, so I can see "rows updated: 3,258,123" and back the fuck out of it.

I genuinely believe that UPDATE and DELETE without a WHERE clause should be considered a syntax error. If you want to do all rows for some reason, it should have been something like UPDATE table SET field=value ALL.

[–] drekly@lemmy.world 1 points 11 months ago (2 children)

Because I'm relatively new at this type of thing, how does that appear on the front end? I'm using a js/html front end and a jsnode backend. Would I just see a popup before I make any changes?

[–] aravindan_v@programming.dev 2 points 11 months ago

If you're asking about the information about the number of rows, oracle db clients do that. For nodejs, oracle's library will provide this number in the response to a dml statement execution. So you can retrieve it in your backend code. You have to write additional code to bring this message to the front-end.

https://oracle.github.io/node-oracledb/

[–] Blackmist@feddit.uk 2 points 11 months ago

No idea. My tools connect directly to the DB server, rather than going though any web server shenanigans.