You might also want to look at streaming-postgresql-simple for similar prior art.
Ollie On Sun, 30 Jul 2017, 3:47 pm Bas van Dijk, <[email protected]> wrote: > I like the ListT suggestion and just implemented it. > > I don't understand how I can get rid of SafeT by using Managed. You're > talking about Managed from your managed package right? > > On 30 July 2017 at 15:58, Gabriel Gonzalez <[email protected]> wrote: > >> Looks pretty straightforward to me >> >> The only other suggestion I'd provide is to also provide a `Managed` >> version of the same `Producer`, with this type: >> >> query >> :: (Default QueryRunner columns haskells, MonadIO m, MonadMask m) >> => Connection -> Query columns -> Managed (Producer haskells m ()) >> >> Also, since it doesn't use the return value, you could even use the >> simpler `ListT` type instead: >> >> query >> :: (Default QueryRunner columns haskells, MonadIO m, MonadMask m) >> => Connection -> Query columns -> Managed (ListT m haskells) >> >> ... and then you can always convert that back to a `Producer` using >> `enumerate` if necessary >> >> On Jul 29, 2017, at 2:54 PM, Bas van Dijk <[email protected]> wrote: >> >> Hello, >> >> I just started playing with pipes and I really like it so far. For my >> first project I would like to create a Producer for opaleye query results. >> I came up with the following: >> >> >> https://github.com/basvandijk/pipes-opaleye/blob/master/src/Pipes/Opaleye/RunQuery.hs >> >> Is that the correct way of doing it? What can be improved? >> >> Thanks, >> >> Bas >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Haskell Pipes" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To post to this group, send email to [email protected]. >> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Haskell Pipes" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To post to this group, send email to [email protected]. >> > > -- > You received this message because you are subscribed to the Google Groups > "Haskell Pipes" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > -- You received this message because you are subscribed to the Google Groups "Haskell Pipes" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected].
