postgresql - Using postgres-simple, how do I get multiple parameters from a row -

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i trying make basic query postgresql-simple 0.5.0.1 , 0.5.1.0. familiar content in postgresql-simple query error, different error message.

data sensorrow = sensorrow int string string deriving show instance fromrow sensorrow     fromrow = sensorrow <$> field <*> field <*> field  *databaseintegrationspec> db <- connectpostgresql dbstring  *databaseintegrationspec> r <- query_ db "select (id, name, token) sensor" :: io [sensorrow] *** exception: incompatible {errsqltype = "record", errsqltableoid = nothing, errsqlfield = "row", errhaskelltype = "int", errmessage = "types incompatible"} *databaseintegrationspec> r <- query_ db "select (id, name, token) sensor" :: io [(int, string, string)] *** exception: incompatible {errsqltype = "record", errsqltableoid = nothing, errsqlfield = "row", errhaskelltype = "int", errmessage = "types incompatible"} *databaseintegrationspec>

by reading of documentation , of example code, both of these queries should work. however, reading error message, errsqlfield, appears in both cases library trying convert entire row int.

so, wrong here? have encountered bug in postgresql-simple library, , if so, how can work around it?

the entire problem lay in sql query. correct query use is:

*databaseintegrationspec> r <- query_ db "select id, name, token sensor" :: io [sensorrow]

in short, putting parenthesis around field names in query causes postgresql return things in format not know how decode.


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