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'In a' is not an instance of QueryParams #3

jartur opened this Issue May 31, 2012 · 2 comments


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jartur commented May 31, 2012

No instance for (Database.MySQL.Simple.QueryParams.QueryParams
(In [Int]))
arising from a use of `query'
Possible fix:
add an instance declaration for
(Database.MySQL.Simple.QueryParams.QueryParams (In [Int]))
In a stmt of a 'do' expression:
strs <- query
conn "SELECT us_nick FROM players WHERE us_person_id IN ?" (In ids)

It's actually easy to work around using 'Only $ In ...' but since it is not in docs I think it's a bug.

Gentle bump. Would it be possible to upload a new version? The latest docs on hackage still have the bad example. The corrected documentation would have saved me 10 minutes, no doubt it will help others too.

Gentle Bump!

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