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comments on using luasqlite db:nrows

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Posted by

Fiendish USA (2,555 posts) Bio Global Moderator

Date

Sat 12 Nov 2011 06:19 AM (UTC)

Amended on Sat 12 Nov 2011 03:25 PM (UTC) by Fiendish

Message

The documentation for db:nrows (and possibly db:rows and db:urows as well) should note that you should never break or return before the for loop is finished, because that apparently leaves the table locked as I've discovered the hard way. You can test this by doing something like "PRAGMA wal_checkpoint;" (assuming your journal_mode is set to WAL) after breaking out of the db:nrows loop and then checking the error code.

https://github.com/fiendish/aardwolfclientpackage

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Posted by Nick Gammon Australia (23,173 posts) Bio Forum Administrator

Date Reply #1 on Sat 12 Nov 2011 09:53 PM (UTC)

Message

Yes I wondered about that. Hence my caution when doing this:


for a in db:nrows "SELECT * FROM sqlite_master WHERE name = 'rooms_lookup' AND type = 'table'" do
    table_exists = true
  end  -- for

Although you should only get one match, I let the for loop iterate and "clean up" afterwards.

Documentation amended for the next release.

- Nick Gammon

www.gammon.com.au, www.mushclient.com

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