Trait ColumnValue 

pub trait ColumnValue {
    type Rust;

    const TYPE: ColumnType;

    // Required method
    fn from_value(value: Value) -> Option<Self::Rust>;
}

The Rust value a column whose SQL type is Self is set to: the SQL type’s Rust type, or an Option of it for a nullable column.

Required Associated Constants

const TYPE: ColumnType

What the column takes, for the compile-time check that a domain field’s value fits it: ColumnType::not_null for a NOT NULL SQL type.

Required Associated Types

type Rust

The Rust type.

Required Methods

fn from_value(value: Value) -> Option<Self::Rust>

The value as that type; None if it does not fit (another type, or a NULL for a NOT NULL column).

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl ColumnValue for BigInt

const TYPE: ColumnType

type Rust = i64

fn from_value(value: Value) -> Option<Self::Rust>

impl ColumnValue for Bool

const TYPE: ColumnType

type Rust = bool

fn from_value(value: Value) -> Option<Self::Rust>

impl ColumnValue for Date

const TYPE: ColumnType

type Rust = NaiveDate

fn from_value(value: Value) -> Option<Self::Rust>

impl ColumnValue for Datetime

const TYPE: ColumnType

type Rust = NaiveDateTime

fn from_value(value: Value) -> Option<Self::Rust>

impl ColumnValue for Double

const TYPE: ColumnType

type Rust = f64

fn from_value(value: Value) -> Option<Self::Rust>

impl ColumnValue for Float

const TYPE: ColumnType

type Rust = f32

fn from_value(value: Value) -> Option<Self::Rust>

impl ColumnValue for Integer

const TYPE: ColumnType

type Rust = i32

fn from_value(value: Value) -> Option<Self::Rust>

impl ColumnValue for SmallInt

const TYPE: ColumnType

type Rust = i16

fn from_value(value: Value) -> Option<Self::Rust>

impl ColumnValue for Text

const TYPE: ColumnType

type Rust = String

fn from_value(value: Value) -> Option<Self::Rust>

impl ColumnValue for Time

const TYPE: ColumnType

type Rust = NaiveTime

fn from_value(value: Value) -> Option<Self::Rust>

impl ColumnValue for Timestamp

const TYPE: ColumnType

type Rust = NaiveDateTime

fn from_value(value: Value) -> Option<Self::Rust>

impl ColumnValue for Timestamptz

const TYPE: ColumnType

type Rust = DateTime<Utc>

fn from_value(value: Value) -> Option<Self::Rust>

impl ColumnValue for TimestamptzSqlite

const TYPE: ColumnType

type Rust = DateTime<Utc>

fn from_value(value: Value) -> Option<Self::Rust>

impl<ST: ValueSqlType> ColumnValue for Nullable<ST>

const TYPE: ColumnType

type Rust = Option<<ST as ValueSqlType>::Rust>

fn from_value(value: Value) -> Option<Self::Rust>

Implementors