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definition:
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existsDBKey :: KeyPred _ -> Key -> Query Bool
existsDBKey keyPred key = Query $
do n <- selectInt keyPred "count(*)" $ "where _rowid_ = " ++ show key
return $! n > 0
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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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--- Checks whether the predicate has an entry with the given key.
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failfree:
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(_, _)
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indeterministic:
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referentially transparent operation
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infix:
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no fixity defined
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iotype:
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{(_,_) |-> _}
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name:
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existsDBKey
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precedence:
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no precedence defined
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result-values:
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_
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signature:
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(Prelude.Int -> a -> Dynamic) -> Prelude.Int -> Query Prelude.Bool
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solution-complete:
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operation might suspend on free variables
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terminating:
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possibly non-terminating
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totally-defined:
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possibly non-reducible on same data term
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