#23646: query set sql update to change different values by different keys
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Reporter: brillgen | Owner: nobody
Type: New feature | Status: closed
Component: Database layer | Version: 1.7
(models, ORM) | Resolution: wontfix
Severity: Normal | Triage Stage:
Keywords: | Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by shaib):
On an old project, ~10 years ago and not Django based, we used a "bulk
update" procedure that did:
1) Bulk-insert the new records into a temporary table
2) update in one statement using a join (SQL Server lets you do that)
On hundreds of records, this was significantly faster than updating one-
by-one (I no longer have access to any hard data, and it's irrelevant
anyways).
Anyway, I suspect a better API would involve passing a collection of
objects and selecting just the fields to update:
`Book.objects.update_many(books, 'price')`
--
Ticket URL: <https://code.djangoproject.com/ticket/23646#comment:3>
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