native_db_32bit::transaction::query

Struct RwLen

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pub struct RwLen<'db, 'txn> { /* private fields */ }

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impl RwLen<'_, '_>

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pub fn primary<T: Input>(&self) -> Result<u64>

Get the number of values.

Same as RLen::primary().

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pub fn secondary<T: Input>( &self, _key_def: impl KeyDefinition<DatabaseSecondaryKeyOptions>, ) -> Result<Option<T>>

Get the number of values by secondary key.

Same as RLen::secondary().

Auto Trait Implementations§

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impl<'db, 'txn> Freeze for RwLen<'db, 'txn>

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impl<'db, 'txn> !RefUnwindSafe for RwLen<'db, 'txn>

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impl<'db, 'txn> Send for RwLen<'db, 'txn>

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impl<'db, 'txn> Sync for RwLen<'db, 'txn>

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impl<'db, 'txn> Unpin for RwLen<'db, 'txn>

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impl<'db, 'txn> !UnwindSafe for RwLen<'db, 'txn>

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impl<T> Any for T
where T: 'static + ?Sized,

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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.