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  • add ability to configure "on delete" and "on update" attributes of foreign keys: · 2 ✖

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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
1539018912 https://github.com/simonw/sqlite-utils/issues/530#issuecomment-1539018912 https://api.github.com/repos/simonw/sqlite-utils/issues/530 IC_kwDOCGYnMM5bu5Cg simonw 9599 2023-05-08T20:39:00Z 2023-05-08T20:39:00Z OWNER

I think the natural place to add these in the Python library API would be https://sqlite-utils.datasette.io/en/stable/python-api.html#adding-foreign-key-constraints - maybe something like this:

python db["books"].add_foreign_key("author_id", "authors", "id", on_delete=RESTRICT)

Then for the CLI tool could be added to https://sqlite-utils.datasette.io/en/stable/cli-reference.html#add-foreign-key

sqlite-utils add-foreign-key my.db books author_id authors id --on-update SET_NULL I wouldn't support these for the other methods of adding foreign keys - foreign_keys(...) for the various .insert() etc methods and the add_foreign_keys(...) bulk menthod.

 
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 add ability to configure "on delete" and "on update" attributes of foreign keys: 1595340692  
1539015064 https://github.com/simonw/sqlite-utils/issues/530#issuecomment-1539015064 https://api.github.com/repos/simonw/sqlite-utils/issues/530 IC_kwDOCGYnMM5bu4GY simonw 9599 2023-05-08T20:35:07Z 2023-05-08T20:35:07Z OWNER

Wow, this is a neat feature I didn't know about. Looks like there are a bunch of options:

  • NO ACTION (default)
  • RESTRICT: application is prohibited from deleting a parent key when there exists one or more child keys mapped to it
  • SET NULL: when a parent key is deleted the child key columns of all rows in the child table that mapped to the parent key are set to contain SQL NULL values
  • SET DEFAULT: set a specific default
  • CASCADE: propagates the delete or update operation on the parent key to each dependent child key
 
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 add ability to configure "on delete" and "on update" attributes of foreign keys: 1595340692  

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