CurryInfo: ertools-3.0.0 / Database.ERD.Generic.deleteEntryR
definition: 
|
deleteEntryR :: (Eq a, Read a, Show a, Eq b, Read b, Show b) =>
(Key -> (a,b) -> Dynamic) -> a -> b -> Transaction ()
deleteEntryR entrypred key1 key2 =
getDB (transformQ (map fst . filter (\ (_,i) -> i==(key1,key2)))
(allDBKeyInfos entrypred)) |>>= \kis ->
if null kis
then errorT (TError NoRelationshipError
("relationship for deletion not found for keys: "
++show key1++" "++show key2))
else deleteDBEntries entrypred kis
|
|
demand:
|
no demanded arguments |
|
deterministic:
|
deterministic operation |
|
documentation:
|
Delete a relationship represented as an entity. If the relationship does not exist, a NoRelationshipError is raised. |
|
failfree:
|
<FAILING> |
|
indeterministic:
|
referentially transparent operation |
|
infix:
|
no fixity defined |
|
iotype:
|
{(_,_,_,_,_,_,_,_,_) |-> _}
|
|
name:
|
deleteEntryR |
|
precedence:
|
no precedence defined |
|
result-values:
|
_ |
|
signature:
|
(Prelude.Eq a, Prelude.Read a, Prelude.Show a, Prelude.Eq b, Prelude.Read b, Prelude.Show b) => (Prelude.Int -> (a, b) -> Database.KeyDatabaseSQLite.Dynamic) -> a -> b -> Database.KeyDatabaseSQLite.Transaction () |
|
solution-complete:
|
operation might suspend on free variables |
|
terminating:
|
possibly non-terminating |
|
totally-defined:
|
possibly non-reducible on same data term |