Trait ValueSqlType 

pub trait ValueSqlType:
    SqlType<IsNull = NotNull>
    + SingleValue
    + Sized {
    type Rust: AsExpression<Self> + Send + 'static;

    const ACCEPTS: &'static [ValueKind];

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

A non-null SQL type a domain value binds as: the Rust type it binds, taken from a Value.

Implemented for Diesel’s SQL types queryweave’s values fit, each accepting the variants it holds without loss (an Integer column takes I32 and I16; a Timestamp column a NaiveDateTime, or a UTC DateTimeUtc as its naive UTC time). Implement it for a SQL type of your own (with Comparison and ColumnValue) to filter and write its columns.

Required Associated Constants

const ACCEPTS: &'static [ValueKind]

The Value variants rust takes, for the compile-time check that a domain field’s value fits its column.

Required Associated Types

type Rust: AsExpression<Self> + Send + 'static

The Rust type the value binds as.

Required Methods

fn rust(value: Value) -> Result<Option<Self::Rust>, Value>

The value as this SQL type’s Rust type (None for a NULL).

Errors

The value itself, if it is of another type.

Dyn Compatibility

This trait is not dyn compatible.

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

Implementations on Foreign Types

impl ValueSqlType for BigInt

const ACCEPTS: &'static [ValueKind]

type Rust = i64

fn rust(value: Value) -> Result<Option<Self::Rust>, Value>

impl ValueSqlType for Bool

const ACCEPTS: &'static [ValueKind]

type Rust = bool

fn rust(value: Value) -> Result<Option<Self::Rust>, Value>

impl ValueSqlType for Date

const ACCEPTS: &'static [ValueKind]

type Rust = NaiveDate

fn rust(value: Value) -> Result<Option<Self::Rust>, Value>

impl ValueSqlType for Datetime

const ACCEPTS: &'static [ValueKind]

type Rust = NaiveDateTime

fn rust(value: Value) -> Result<Option<Self::Rust>, Value>

impl ValueSqlType for Double

const ACCEPTS: &'static [ValueKind]

type Rust = f64

fn rust(value: Value) -> Result<Option<Self::Rust>, Value>

impl ValueSqlType for Float

const ACCEPTS: &'static [ValueKind]

type Rust = f32

fn rust(value: Value) -> Result<Option<Self::Rust>, Value>

impl ValueSqlType for Integer

const ACCEPTS: &'static [ValueKind]

type Rust = i32

fn rust(value: Value) -> Result<Option<Self::Rust>, Value>

impl ValueSqlType for SmallInt

const ACCEPTS: &'static [ValueKind]

type Rust = i16

fn rust(value: Value) -> Result<Option<Self::Rust>, Value>

impl ValueSqlType for Text

const ACCEPTS: &'static [ValueKind]

type Rust = String

fn rust(value: Value) -> Result<Option<Self::Rust>, Value>

impl ValueSqlType for Time

const ACCEPTS: &'static [ValueKind]

type Rust = NaiveTime

fn rust(value: Value) -> Result<Option<Self::Rust>, Value>

impl ValueSqlType for Timestamp

const ACCEPTS: &'static [ValueKind]

type Rust = NaiveDateTime

fn rust(value: Value) -> Result<Option<Self::Rust>, Value>

impl ValueSqlType for Timestamptz

const ACCEPTS: &'static [ValueKind]

type Rust = DateTime<Utc>

fn rust(value: Value) -> Result<Option<Self::Rust>, Value>

impl ValueSqlType for TimestamptzSqlite

const ACCEPTS: &'static [ValueKind]

type Rust = DateTime<Utc>

fn rust(value: Value) -> Result<Option<Self::Rust>, Value>

Implementors