Home/ Questions/Q 8118515
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-06-06T04:30:49+00:00

I would like to do a LIKE query in persistent, I’m using sqlite. The

  • 0

I would like to do a LIKE query in persistent, I’m using sqlite. The yesod book gives an example of using raw SQL to do it, but says:

you can express a LIKE operator directly in the normal syntax due to a
feature added in Persistent 0.6, which allows backend-specific
operators

I couldn’t find an example of that, though. Would somebody have an example of what it would mean to use a specific operator like LIKE with selectList or something equivalent?

Thanks!

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    I know I’ve used it before, but I can’t remember where. Anyway, a simple example (not GHC-checked, apologies) would be:

    selectList [Filter PersonName (Left $ PersistText "%Michael%") (BackendSpecificFilter "ILIKE")] []

    Obviously you can create some helper function, e.g.:

    icontains field val = Filter field (Left $ PersistText $ T.concat ["%", val, "%"]) (BackendSpecificFilter "ILIKE")
selectList [Personname `icontains` "Michael"] []
    • 0