Trait FromColumnRef 

pub trait FromColumnRef<'r>: Sized {
    // Required method
    fn from_column_ref(row: &'r RowRef<'r>, index: usize) -> Result<Self, Error>;
}

Decodes one column directly from a borrowed row.

This is the trait behind RowRef::get. Most types do not need to implement it manually because many implementations can go through Decode.

Implementors may borrow from row, so the returned value must not outlive 'r.

Required Methods

fn from_column_ref(row: &'r RowRef<'r>, index: usize) -> Result<Self, Error>

Decodes the column at index.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types

impl<'r> FromColumnRef<'r> for &'r str

fn from_column_ref(row: &'r RowRef<'r>, index: usize) -> Result<&'r str, Error>

impl<'r> FromColumnRef<'r> for &'r [u8]

fn from_column_ref(row: &'r RowRef<'r>, index: usize) -> Result<&'r [u8], Error>

impl<'r> FromColumnRef<'r> for bool

fn from_column_ref(row: &'r RowRef<'r>, index: usize) -> Result<bool, Error>

impl<'r> FromColumnRef<'r> for f64

fn from_column_ref(row: &'r RowRef<'r>, index: usize) -> Result<f64, Error>

impl<'r> FromColumnRef<'r> for i64

fn from_column_ref(row: &'r RowRef<'r>, index: usize) -> Result<i64, Error>

impl<'r> FromColumnRef<'r> for u64

fn from_column_ref(row: &'r RowRef<'r>, index: usize) -> Result<u64, Error>

impl<'r> FromColumnRef<'r> for String

fn from_column_ref(row: &'r RowRef<'r>, index: usize) -> Result<String, Error>

impl<'r> FromColumnRef<'r> for Vec<u8>

fn from_column_ref(row: &'r RowRef<'r>, index: usize) -> Result<Vec<u8>, Error>

Implementors

impl<'r> FromColumnRef<'r> for Value

impl<'r> FromColumnRef<'r> for Date

impl<'r> FromColumnRef<'r> for DateTime

impl<'r> FromColumnRef<'r> for DateTimeTz

impl<'r> FromColumnRef<'r> for Time