Trait sqlx_core::row::ColumnIndex

pub trait ColumnIndex<'c, R: ?Sized> where
    Self: Sealed,
    R: Row<'c>, {
    fn index(&self, row: &R) -> Result<usize>;
}

A type that can be used to index into a Row.

The get and try_get methods of Row accept any type that implements ColumnIndex. This trait is implemented for strings which are used to look up a column by name, and for usize which is used as a positional index into the row.

This trait is sealed and cannot be implemented for types outside of SQLx.

Required methods

fn index(&self, row: &R) -> Result<usize>

Returns a valid positional index into the row, ColumnIndexOutOfBounds, or, ColumnNotFound.

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Implementations on Foreign Types

impl<'c, '_, R, I: ?Sized> ColumnIndex<'c, R> for &'_ I where
    R: Row<'c>,
    I: ColumnIndex<'c, R>, 

fn index(&self, row: &R) -> Result<usize>

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Implementors

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