Struct diesel::row::PartialRow

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pub struct PartialRow<'a, R> { /* private fields */ }
Available on crate feature i-implement-a-third-party-backend-and-opt-into-breaking-changes only.
Expand description

A row type that wraps an inner row

This type only allows to access fields of the inner row, whose index is part of range. This type is used by diesel internally to implement FromStaticSqlRow.

Indexing via usize starts with 0 for this row type. The index is then shifted by self.range.start to match the corresponding field in the underlying row.

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impl<'a, R> PartialRow<'a, R>

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pub fn new<'b, DB>(inner: &'a R, range: Range<usize>) -> Self
where R: Row<'b, DB>, DB: Backend,

Create a new PartialRow instance based on an inner row and a range of field that should be part of the constructed wrapper.

See the documentation of PartialRow for details.

Trait Implementations§

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impl<'a, R: Debug> Debug for PartialRow<'a, R>

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<'a, 'b, DB, R> Row<'a, DB> for PartialRow<'b, R>
where DB: Backend, R: Row<'a, DB>,

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type Field<'f> = <R as Row<'a, DB>>::Field<'f> where R: 'f, Self: 'f, 'a: 'f

Field type returned by a Row implementation Read more
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type InnerPartialRow = R

Return type of PartialRow Read more
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fn field_count(&self) -> usize

Get the number of fields in the current row
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fn get<'c, I>(&'c self, idx: I) -> Option<Self::Field<'c>>
where Self: RowIndex<I>, 'a: 'c,

Get the field with the provided index from the row. Read more
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fn partial_row(&self, range: Range<usize>) -> PartialRow<'_, R>

Returns a wrapping row that allows only to access fields, where the index is part of the provided range.
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fn get_value<ST, T, I>(&self, idx: I) -> Result<T>
where Self: RowIndex<I>, T: FromSql<ST, DB>,

Get a deserialized value with the provided index from the row.
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impl<'a, 'b, R> RowIndex<&'a str> for PartialRow<'b, R>
where R: RowIndex<&'a str>,

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fn idx(&self, idx: &'a str) -> Option<usize>

Get the numeric index inside the current row for the provided index value
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impl<'a, R> RowIndex<usize> for PartialRow<'a, R>
where R: RowIndex<usize>,

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fn idx(&self, idx: usize) -> Option<usize>

Get the numeric index inside the current row for the provided index value
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impl<'a, R> RowSealed for PartialRow<'a, R>

Auto Trait Implementations§

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impl<'a, R> Freeze for PartialRow<'a, R>

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impl<'a, R> RefUnwindSafe for PartialRow<'a, R>
where R: RefUnwindSafe,

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impl<'a, R> Send for PartialRow<'a, R>
where R: Sync,

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impl<'a, R> Sync for PartialRow<'a, R>
where R: Sync,

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impl<'a, R> Unpin for PartialRow<'a, R>

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impl<'a, R> UnwindSafe for PartialRow<'a, R>
where R: RefUnwindSafe,

Blanket Implementations§

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

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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

Mutably borrows from an owned value. Read more
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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> IntoSql for T

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fn into_sql<T>(self) -> AsExprOf<Self, T>

Convert self to an expression for Diesel’s query builder. Read more
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fn as_sql<'a, T>(&'a self) -> AsExprOf<&'a Self, T>

Convert &self to an expression for Diesel’s query builder. Read more
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impl<'a, R, DB> NamedRow<'a, DB> for R
where R: Row<'a, DB>, DB: Backend,

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fn get<ST, T>( &self, column_name: &str, ) -> Result<T, Box<dyn Error + Sync + Send>>
where T: FromSql<ST, DB>,

Retrieve and deserialize a single value from the query Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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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.
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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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impl<T> ErasedDestructor for T
where T: 'static,

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impl<T> MaybeSendSync for T