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definition:
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deleteEntries :: EntityDescription a -> (Maybe Constraint) -> DBAction ()
deleteEntries en const =
let query = "delete from '" ++ (getTable en) ++ "' " ++
(case const of
Just c -> "where "++(trConstraint c)
_ -> "") ++ ";"
in execute query []
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demand:
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no demanded arguments
|
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deterministic:
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deterministic operation
|
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documentation:
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--- Deletes entries depending on wether they fulfill the criteria or not
--- @param en - The EntityDescription descriping the Entities that are to
--- be updated
--- @param const - A Constraint can be be given as input which describes
--- which entities should be deleted. Only entities fulfilling the constraint
--- will be deleted. Nothing deletes every entry.
--- @return A Result without parameter if everything went right, an
--- Error if something went wrong
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failfree:
|
<FAILING>
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indeterministic:
|
referentially transparent operation
|
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infix:
|
no fixity defined
|
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iotype:
|
{(_,_) |-> _}
|
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name:
|
deleteEntries
|
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precedence:
|
no precedence defined
|
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result-values:
|
_
|
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signature:
|
Database.CDBI.Description.EntityDescription a
-> Prelude.Maybe Database.CDBI.Criteria.Constraint
-> Database.CDBI.Connection.DBAction ()
|
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solution-complete:
|
operation might suspend on free variables
|
|
terminating:
|
possibly non-terminating
|
|
totally-defined:
|
possibly non-reducible on same data term
|