Re: [Haskelldb-users] General questions (insertion)

[Bjorn B. <bj...@br...>]

On Mon, May 26, 2008 at 7:58 PM, "Rafael J. Fernández-Moctezuma"
<rfe...@cs...> wrote:
> Hi!
>
> On May 26, 2008, at 3:32 AM, Marc Weber wrote:
>
>>>
>> Haskelldb provides type safety when creating SQL-queries.. but how
>> does
>> it know about your database scheme?
>
> tiny, minor detail :) (for some reason I thought this was encapsulated
> in the connection...)
>
>>
>>        createDBModules = dbInfoToModuleFiles "." "TimeTrackerDB"
>> dbInfo
>>
>
> I used a similar construct and now have support modules, so variables
> are in scope. Hooray!
>
> So I tested my insertion,
>
>   testInsert database = insert database boats (bid << constant 1 #
> bname << constant "Boo" # color << constant "Purple")
>
> only to find an unexpected error, namely, "No instance for (Num (Maybe
> Int)) arising from the literal `1' [..]
>
> I'm sure I'm missing yet another obvious thing... any ideas?

Use

constant (Just 1)

instead of

constant 1

/Björn