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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 {"total_count": 1, "+1": 1, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} add ability to configure "on delete" and "on update" attributes of foreign keys: 1595340692  
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. {"total_count": 1, "+1": 0, "-1": 0, "laugh": 1, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} add ability to configure "on delete" and "on update" attributes of foreign keys: 1595340692  

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