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  • .transform() fails to drop column if table is part of a view · 3 ✖

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id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions issue performed_via_github_app
1683404978 https://github.com/simonw/sqlite-utils/issues/586#issuecomment-1683404978 https://api.github.com/repos/simonw/sqlite-utils/issues/586 IC_kwDOCGYnMM5kVriy simonw 9599 2023-08-18T06:13:46Z 2023-08-18T06:13:46Z OWNER

I shipped the view recreating fix in datasette-edit-schema, so at least I can start exercising that fix and see if it has any weird issues.

 
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 .transform() fails to drop column if table is part of a view 1856075668  
1683398866 https://github.com/simonw/sqlite-utils/issues/586#issuecomment-1683398866 https://api.github.com/repos/simonw/sqlite-utils/issues/586 IC_kwDOCGYnMM5kVqDS simonw 9599 2023-08-18T06:05:50Z 2023-08-18T06:06:42Z OWNER

Options: - Provide a recreate_views: bool parameter to table.transform() controlling if views that might reference this table are stashed and dropped and recreated within a transaction as part of the operation. But should that be True or False by default? - Read that PRAGMA and automatically do that view workaround if it's turned on - Toggle that PRAGMA off for the duration of the .transform() operation and on again at the end. Does it only affect the current connection? - Try the transform() in a transaction, detect the "error in view", "no such table"error, if spotted then do the VIEW workaround and try again

I'm on the fence as to which of these I like the most. I'm tempted to go with the one which just drops VIEWS and recreates them all the time, because it feels simpler.

 
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 .transform() fails to drop column if table is part of a view 1856075668  
1683396150 https://github.com/simonw/sqlite-utils/issues/586#issuecomment-1683396150 https://api.github.com/repos/simonw/sqlite-utils/issues/586 IC_kwDOCGYnMM5kVpY2 simonw 9599 2023-08-18T06:02:18Z 2023-08-18T06:06:31Z OWNER

More notes in here: - https://github.com/simonw/datasette-edit-schema/issues/35#issuecomment-1683392873

Not all Python/SQLite installations exhibit this problem by default!

It turns out this is controlled by the legacy_alter_table pragma: https://sqlite.org/pragma.html#pragma_legacy_alter_table

If that PRAGMA is turned on (default in newer SQLites) then alter table will error if you try to rename a table that is referenced in a view.

Here's a one-liner to test if it is on or not:

bash python -c 'import sqlite3; print(sqlite3.connect(":memory:").execute("PRAGMA legacy_alter_table").fetchall())'

 
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 .transform() fails to drop column if table is part of a view 1856075668  

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