Trait FromValue 

pub trait FromValue: Sized {
    // Required method
    fn from_value(value: &Value, type_: &Type) -> Result<Self, ConvertError>;
}

Converts a Spanner Value into a Rust type.

Implementations are provided for all standard types like String, primitive integer and float types, decimals, timestamps, dates, vectors, and options for nullable fields.

Required Methods

fn from_value(value: &Value, type_: &Type) -> Result<Self, ConvertError>

Converts a Spanner value into the target Rust type, using the provided Spanner Type metadata for compatibility checks.

Errors

Returns a ConvertError if the kind of the value does not match the expected kind, if the value is null but the target type is not optional (e.g., Option<T>), or if parsing or decoding the inner value format fails.

Dyn Compatibility

This trait is not dyn compatible.

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

Implementations on Foreign Types

impl FromValue for Date

fn from_value(value: &Value, type_: &Type) -> Result<Self, ConvertError>

impl FromValue for OffsetDateTime

fn from_value(value: &Value, type_: &Type) -> Result<Self, ConvertError>

impl FromValue for String

fn from_value(value: &Value, _type: &Type) -> Result<Self, ConvertError>

impl FromValue for SystemTime

fn from_value(value: &Value, type_: &Type) -> Result<Self, ConvertError>

impl FromValue for Timestamp

fn from_value(value: &Value, type_: &Type) -> Result<Self, ConvertError>

impl FromValue for Vec<u8>

fn from_value(value: &Value, type_: &Type) -> Result<Self, ConvertError>

impl FromValue for bool

fn from_value(value: &Value, _type: &Type) -> Result<Self, ConvertError>

impl FromValue for f32

fn from_value(value: &Value, _type: &Type) -> Result<Self, ConvertError>

impl FromValue for f64

fn from_value(value: &Value, _type: &Type) -> Result<Self, ConvertError>

impl FromValue for i32

fn from_value(value: &Value, _type: &Type) -> Result<Self, ConvertError>

impl FromValue for i64

fn from_value(value: &Value, _type: &Type) -> Result<Self, ConvertError>

impl<T> FromValue for Option<T>

where T: FromValue,

fn from_value(value: &Value, type_: &Type) -> Result<Self, ConvertError>

impl<T> FromValue for Vec<T>

where T: FromValue,

fn from_value(value: &Value, type: &Type) -> Result<Self, ConvertError>

Implementors

impl FromValue for Decimal

impl FromValue for Value