Trait ColumnIndex

pub trait ColumnIndex<T>: Debug
where
    T: ?Sized,
{
    // Required method
    fn index(&self, container: &T) -> Result<usize, Error>;
}

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

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.

Required Methods

fn index(&self, container: &T) -> Result<usize, Error>

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

Implementations on Foreign Types

impl ColumnIndex<AnyRow> for usize

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

impl ColumnIndex<AnyStatement<'_>> for usize

fn index(&self, statement: &AnyStatement<'_>) -> Result<usize, Error>

impl ColumnIndex<PgRow> for &str

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

impl ColumnIndex<PgRow> for usize

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

impl ColumnIndex<PgStatement<'_>> for &str

fn index(&self, statement: &PgStatement<'_>) -> Result<usize, Error>

impl ColumnIndex<PgStatement<'_>> for usize

fn index(&self, statement: &PgStatement<'_>) -> Result<usize, Error>

impl ColumnIndex<SqliteRow> for &str

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

impl ColumnIndex<SqliteRow> for usize

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

impl ColumnIndex<SqliteStatement<'_>> for &str

fn index(&self, statement: &SqliteStatement<'_>) -> Result<usize, Error>

impl ColumnIndex<SqliteStatement<'_>> for usize

fn index(&self, statement: &SqliteStatement<'_>) -> Result<usize, Error>

impl<'i> ColumnIndex<AnyRow> for &'i str

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

impl<'i> ColumnIndex<AnyStatement<'_>> for &'i str

fn index(&self, statement: &AnyStatement<'_>) -> Result<usize, Error>

impl<T, I> ColumnIndex<T> for &I

where I: ColumnIndex<T> + ?Sized, T: ?Sized,

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

Implementors