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September 2009

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302 discussions

Re: [Haskell-cafe] Takusen - is anyone currently using it on Win32 - ODBC?
by Günther Schmidt 01 Sep '09

01 Sep '09

Hi Anton, well the problem isn't really accessing the data as such, it's quite easy to use HDBC.ODBC for instance to read in the data in a very comfortable way. I was explicitly asking for Takusen because it make certain guarantees regarding resources, memory consumption and such. One of the files for instance has 298 k lines. A glance over sushi revealed that parsec is involved so I can only presume it is read into memory all at once. That would certainly be a problem. Thanks, Günther Am 31.08.2009, 19:47 Uhr, schrieb Anton van Straaten <anton(a)appsolutions.com>: > Günther Schmidt wrote: >> My app then needs to read in dynamic data, a set of 4 CSV files, and I >> had been using Microsofts ODBC driver with HDBC.ODBC and that worked >> too. >> When I try to swap it for Takusen though I get an >> *** Exception: DBError ("HY","C00") 106 "[Microsoft][ODBC Text >> Driver] >> Optional Feature was not implemented >> Which is a bit of a shame, because using the ODBC text driver was much >> simpler than parsing the CSV files. > > A simple but powerful way to access CSV files is via TxtSushi, which > gives SQL access to CSV files, without needing ODBC: > > Home page: http://keithsheppard.name/txt-sushi/ > Hackage: http://hackage.haskell.org/package/txt-sushi > > You'd have to use it directly, since afaik it won't work with Takusen, > although a Takusen back end for it ought to be possible. > > Anton >

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How to fix such a TYPE problem ?
by zaxis 01 Sep '09

01 Sep '09

>let [y,m,d] = map (\x -> read x::Int) $ splitRegex (mkRegex "-") "2009-08-31" >fromGregorian y m d Couldn't match expected type `Integer' against inferred type `Int' In the first argument of `fromGregorian', namely `y' In the expression: fromGregorian y m d In the definition of `it': it = fromGregorian y m d thanks! -- View this message in context: http://www.nabble.com/How-to-fix-such-a-TYPE-problem---tp25233906p25233906.… Sent from the Haskell - Haskell-Cafe mailing list archive at Nabble.com.

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