Trait ValueRef 

pub trait ValueRef<'r>: Sized {
    type Database: Database;

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

A reference to a single value from the database.

Required Associated Types

type Database: Database

Required Methods

fn to_owned(&self) -> <Self::Database as Database>::Value

Creates an owned value from this value reference.

This is just a reference increment in PostgreSQL and MySQL and thus is O(1). In SQLite, this is a copy.

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.

Dyn Compatibility

This trait is not dyn compatible.

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

Implementors

impl<'a> ValueRef<'a> for AnyValueRef<'a>

type Database = Any

impl<'r> ValueRef<'r> for MySqlValueRef<'r>

type Database = MySql

impl<'r> ValueRef<'r> for PgValueRef<'r>

type Database = Postgres

impl<'r> ValueRef<'r> for SqliteValueRef<'r>

type Database = Sqlite