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  • sqlite-utils · 7 ✖
id node_id number title user state locked assignee milestone comments created_at updated_at ▲ closed_at author_association pull_request body repo type active_lock_reason performed_via_github_app reactions draft state_reason
706091046 MDU6SXNzdWU3MDYwOTEwNDY= 165 Make .transform() a keyword arguments only function simonw 9599 closed 0   2.20 5897911 0 2020-09-22T05:37:29Z 2020-09-24T20:35:47Z 2020-09-22T06:39:12Z OWNER  

And rename the first argument from columns= to types=

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706017416 MDU6SXNzdWU3MDYwMTc0MTY= 164 sqlite-utils transform sub-command simonw 9599 closed 0   2.20 5897911 4 2020-09-22T01:32:20Z 2020-09-24T20:34:50Z 2020-09-22T07:48:05Z OWNER  

The .transform() method in #114 warrants an equivalent CLI tool.

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706757891 MDU6SXNzdWU3MDY3NTc4OTE= 169 Progress bar for "sqlite-utils extract" simonw 9599 closed 0   2.20 5897911 0 2020-09-22T23:40:21Z 2020-09-24T20:34:50Z 2020-09-23T00:02:40Z OWNER  

Since these operations could take a long time against large tables, it would be neat if there was a progress bar option for the CLI command.

The operations are full table scans so calculating progress shouldn't be too difficult. Originally posted by @simonw in https://github.com/simonw/sqlite-utils/issues/42#issuecomment-513246831

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706768798 MDU6SXNzdWU3MDY3Njg3OTg= 170 Release notes for 2.20 simonw 9599 closed 0   2.20 5897911 1 2020-09-23T00:13:22Z 2020-09-23T00:31:25Z 2020-09-23T00:31:25Z OWNER   sqlite-utils 140912432 issue     
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706098005 MDU6SXNzdWU3MDYwOTgwMDU= 167 Review the foreign key pragma stuff simonw 9599 closed 0   2.20 5897911 1 2020-09-22T05:55:20Z 2020-09-23T00:13:02Z 2020-09-23T00:13:02Z OWNER  

It is not possible to enable or disable foreign key constraints in the middle of a multi-statement transaction (when SQLite is not in autocommit mode). Attempting to do so does not return an error; it simply has no effect.

https://sqlite.org/foreignkeys.html

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470345929 MDU6SXNzdWU0NzAzNDU5Mjk= 42 table.extract(...) method and "sqlite-utils extract" command simonw 9599 closed 0   2.20 5897911 21 2019-07-19T14:09:36Z 2020-09-22T23:39:31Z 2020-09-22T23:37:49Z OWNER  

One of my favourite features of csvs-to-sqlite is that it can "extract" columns into a separate lookup table - for example:

csvs-to-sqlite big_csv_file.csv -c country output.db

This will turn the country column in the resulting table into a integer foreign key against a new country table. You can see an example of what that looks like here: https://san-francisco.datasettes.com/registered-business-locations-3d50679/Business+Corridor was extracted from https://san-francisco.datasettes.com/registered-business-locations-3d50679/Registered_Business_Locations_-_San_Francisco?Business%20Corridor=1

I'd like to have the same capability in sqlite-utils - but with the ability to run it against an existing SQLite table rather than just against a CSV.

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621989740 MDU6SXNzdWU2MjE5ODk3NDA= 114 table.transform() method for advanced alter table simonw 9599 closed 0   2.20 5897911 26 2020-05-20T18:20:46Z 2020-09-22T07:51:37Z 2020-09-22T04:20:02Z OWNER  

SQLite's ALTER TABLE can only do the following:

  • Rename a table
  • Rename a column
  • Add a column

Notably, it cannot drop columns - so tricks like "add a float version of this text column, populate it, then drop the old one and rename" won't work.

The docs here https://www.sqlite.org/lang_altertable.html#making_other_kinds_of_table_schema_changes describe a way of implementing full alters safely within a transaction, but it's fiddly.

  1. Create new table
  2. Copy data
  3. Drop old table
  4. Rename new into old

It would be great if sqlite-utils provided an abstraction to help make these kinds of changes safely.

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