dimgigov
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55 lines
1.4 KiB
Nim
55 lines
1.4 KiB
Nim
import options, json
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type
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DbValue*[T] = object
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isNull*: bool
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value*: T
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template fromQueryHook*[T, S](val: var T, x: S) =
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## Default conversion hook used by `query(T): ...`.
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## Users can overload this proc to customize field/type conversions.
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val = x
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template toQueryHook*[T, S](val: var T, x: S) =
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## Default conversion hook used for query parameters.
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## Users can overload this proc to customize parameter conversions.
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val = x
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proc nullQueryValueError() {.noreturn.} =
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raise newException(ValueError, "cannot map NULL query result")
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proc fromQueryHook*[T, S](val: var Option[T], x: var DbValue[S]) =
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if x.isNull:
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val = none(T)
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else:
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var converted: T
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fromQueryHook(converted, move x.value)
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val = some(converted)
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proc fromQueryHook*[T, S](val: var T, x: var DbValue[S]) =
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if x.isNull:
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when T is string:
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val = ""
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elif T is JsonNode:
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val = newJNull()
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else:
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nullQueryValueError()
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else:
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fromQueryHook(val, move x.value)
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proc bindFromQueryHook*[T, S](dest: var T, x: var DbValue[S]) =
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fromQueryHook(dest, x)
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proc toQueryHook*[S, T](val: var DbValue[S], x: Option[T]) =
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if x.isSome:
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val.isNull = false
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toQueryHook(val.value, x.get)
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else:
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val.isNull = true
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when compiles(val.value = default(S)):
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val.value = default(S)
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proc toQueryHook*[S, T](val: var DbValue[S], x: T) =
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val.isNull = false
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toQueryHook(val.value, x)
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