Trait FromValue

pub trait FromValue: Sized {
    type Intermediate: TryFrom<Value, Error = FromValueError> + Into<Self>;

    // Provided methods
    fn from_value(v: Value) -> Self { ... }
    fn from_value_opt(v: Value) -> Result<Self, FromValueError> { ... }
    fn get_intermediate(v: Value) -> Result<Self::Intermediate, FromValueError> { ... }
}

Implement this trait to convert a value to some type.

The FromRow trait requires an ability to rollback this conversion to an original Value instance. Thats the reason why there is the Intermediate type – consider implementing Into<Value> for your Intermediate type if you want FromRow to work with your type.

Required Associated Types

type Intermediate: TryFrom<Value, Error = FromValueError> + Into<Self>

Provided Methods

fn from_value(v: Value) -> Self

Will panic if could not convert v to Self.

fn from_value_opt(v: Value) -> Result<Self, FromValueError>

Will return Err(Error::FromValueError(v)) if could not convert v to Self.

fn get_intermediate(v: Value) -> Result<Self::Intermediate, FromValueError>

Will return Err(Error::FromValueError(v)) if v is not convertible to Self.

Object Safety

This trait is not object safe.

Implementations on Foreign Types

impl FromValue for Value

type Intermediate = ParseIr<Value>

impl FromValue for Cow<'static, str>

type Intermediate = String

impl FromValue for Cow<'static, [u8]>

type Intermediate = Cow<'static, [u8]>

impl FromValue for bool

type Intermediate = ParseIrOpt<bool>

impl FromValue for f32

type Intermediate = ParseIrOpt<f32>

impl FromValue for f64

type Intermediate = ParseIrOpt<f64>

impl FromValue for i8

type Intermediate = ParseIrOpt<i8>

impl FromValue for i16

type Intermediate = ParseIrOpt<i16>

impl FromValue for i32

type Intermediate = ParseIrOpt<i32>

impl FromValue for i64

type Intermediate = ParseIrOpt<i64>

impl FromValue for i128

type Intermediate = ParseIrOpt<i128>

impl FromValue for isize

type Intermediate = ParseIrOpt<isize>

impl FromValue for u8

type Intermediate = ParseIrOpt<u8>

impl FromValue for u16

type Intermediate = ParseIrOpt<u16>

impl FromValue for u32

type Intermediate = ParseIrOpt<u32>

impl FromValue for u64

type Intermediate = ParseIrOpt<u64>

impl FromValue for u128

type Intermediate = ParseIrOpt<u128>

impl FromValue for usize

type Intermediate = ParseIrOpt<usize>

impl FromValue for BigDecimal

type Intermediate = ParseIr<BigDecimal>

impl FromValue for BigInt

type Intermediate = ParseIr<BigInt>

impl FromValue for BigUint

type Intermediate = ParseIr<BigUint>

impl FromValue for Decimal

type Intermediate = ParseIr<Decimal>

impl FromValue for Date

type Intermediate = ParseIr<Date>

impl FromValue for Duration

type Intermediate = ParseIr<Duration>

impl FromValue for PrimitiveDateTime

type Intermediate = ParseIr<PrimitiveDateTime>

impl FromValue for Time

Converts a MySQL TIME value to a time::Time. Note: time::Time only allows for time values in the 00:00:00 - 23:59:59 range. If you’re expecting TIME values in MySQL’s TIME value range of -838:59:59 - 838:59:59, use time::Duration instead.

type Intermediate = ParseIr<Time>

impl FromValue for Uuid

type Intermediate = ParseIr<Uuid>

impl FromValue for Box<str>

type Intermediate = Box<str>

impl FromValue for Box<[u8]>

type Intermediate = Box<[u8]>

impl FromValue for Rc<str>

type Intermediate = Rc<str>

impl FromValue for Rc<[u8]>

type Intermediate = Rc<[u8]>

impl FromValue for String

type Intermediate = String

impl FromValue for Arc<str>

type Intermediate = Arc<str>

impl FromValue for Arc<[u8]>

type Intermediate = Arc<[u8]>

impl FromValue for Vec<u8>

type Intermediate = Vec<u8>

impl FromValue for Duration

type Intermediate = ParseIrOpt<Duration>

impl<T: FromValue> FromValue for Option<T>

type Intermediate = OptionIr2<T>

impl<const N: usize> FromValue for [u8; N]

type Intermediate = [u8; N]

Implementors

impl FromValue for mysql_common::value::Value

type Intermediate = ValueIr

impl<T: DeserializeOwned> FromValue for Deserialized<T>

type Intermediate = ParseIr<Deserialized<T>>