Trait sqlx::row::ColumnIndex

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

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, Error<<R as Row<'c>>::Database>>

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

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Implementations on Foreign Types

impl<'c> ColumnIndex<'c, PgRow<'c>> for str

fn index(&self, row: &PgRow<'c>) -> Result<usize, Error<Postgres>>

impl<'c> ColumnIndex<'c, MySqlRow<'c>> for str

fn index(&self, row: &MySqlRow<'c>) -> Result<usize, Error<MySql>>

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

fn index(&self, row: &R) -> Result<usize, Error<<R as Row<'c>>::Database>>

impl<'c> ColumnIndex<'c, PgRow<'c>> for usize

fn index(&self, row: &PgRow<'c>) -> Result<usize, Error<Postgres>>

impl<'c> ColumnIndex<'c, MySqlRow<'c>> for usize

fn index(&self, row: &MySqlRow<'c>) -> Result<usize, Error<MySql>>

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Implementors

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