Trait Value

pub trait Value {
    type Database: Database<Value = Self>;

    // Required methods
    fn as_ref(&self) -> <Self::Database as Database>::ValueRef<'_>;
    fn type_info(&self) -> Cow<'_, <Self::Database as Database>::TypeInfo>;
    fn is_null(&self) -> bool;

    // Provided methods
    fn decode<'r, T>(&'r self) -> T
       where T: Decode<'r, Self::Database> + Type<Self::Database> { ... }
    fn decode_unchecked<'r, T>(&'r self) -> T
       where T: Decode<'r, Self::Database> { ... }
    fn try_decode<'r, T>(&'r self) -> Result<T, Error>
       where T: Decode<'r, Self::Database> + Type<Self::Database> { ... }
    fn try_decode_unchecked<'r, T>(&'r self) -> Result<T, Error>
       where T: Decode<'r, Self::Database> { ... }
}

An owned value from the database.

Required Associated Types

type Database: Database<Value = Self>

Required Methods

fn as_ref(&self) -> <Self::Database as Database>::ValueRef<'_>

Get this value as a reference.

fn type_info(&self) -> Cow<'_, <Self::Database as Database>::TypeInfo>

Get the type information for this value.

fn is_null(&self) -> bool

Returns true if the SQL value is NULL.

Provided Methods

fn decode<'r, T>(&'r self) -> T

where T: Decode<'r, Self::Database> + Type<Self::Database>,

Decode this single value into the requested type.

Panics

Panics if the value cannot be decoded into the requested type. See try_decode for a non-panicking version.

fn decode_unchecked<'r, T>(&'r self) -> T

where T: Decode<'r, Self::Database>,

Decode this single value into the requested type.

Unlike decode, this method does not check that the type of this value is compatible with the Rust type and blindly tries to decode the value.

Panics

Panics if the value cannot be decoded into the requested type. See try_decode_unchecked for a non-panicking version.

fn try_decode<'r, T>(&'r self) -> Result<T, Error>

where T: Decode<'r, Self::Database> + Type<Self::Database>,

Decode this single value into the requested type.

Errors

• Decode if the value could not be decoded into the requested type.

fn try_decode_unchecked<'r, T>(&'r self) -> Result<T, Error>

where T: Decode<'r, Self::Database>,

Decode this single value into the requested type.

Unlike try_decode, this method does not check that the type of this value is compatible with the Rust type and blindly tries to decode the value.

Errors

• Decode if the value could not be decoded into the requested type.

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.

Implementors

impl Value for SqliteValue

type Database = Sqlite