Trait PrimaryKey 

pub trait PrimaryKey:
    Copy
    + Eq
    + Hash
    + Debug
    + Send
    + Sync
    + 'static
    + ToSqlValue
    + Serialize
    + DeserializeOwned {
    const COLUMN_TYPE: ColumnType;

    // Required methods
    fn null_value() -> SqlValue;
    fn from_row(row: &dyn RangoRow, col: &str) -> Result<Self, RowError>;
}

A primary key value type that a ForeignKey<M> column can hold: Uuid (the default), i32 (FieldAutoInt / FieldInt) or i64 (FieldAutoBigInt / FieldBigInt).

Required Associated Constants

const COLUMN_TYPE: ColumnType

Type of a foreign key column pointing at this key.

Required Methods

fn null_value() -> SqlValue

The SQL NULL of this type (for Option<ForeignKey<M>>).

fn from_row(row: &dyn RangoRow, col: &str) -> Result<Self, RowError>

Reads the key from col.

Dyn Compatibility

This trait is not dyn compatible.

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

Implementations on Foreign Types

impl PrimaryKey for Uuid

const COLUMN_TYPE: ColumnType = crate::ColumnType::Uuid

fn null_value() -> SqlValue

fn from_row(row: &dyn RangoRow, col: &str) -> Result<Self, RowError>

impl PrimaryKey for i32

const COLUMN_TYPE: ColumnType = crate::ColumnType::Int

fn null_value() -> SqlValue

fn from_row(row: &dyn RangoRow, col: &str) -> Result<Self, RowError>

impl PrimaryKey for i64

const COLUMN_TYPE: ColumnType = crate::ColumnType::BigInt

fn null_value() -> SqlValue

fn from_row(row: &dyn RangoRow, col: &str) -> Result<Self, RowError>

Implementors

impl PrimaryKey for UnsupportedPk

const COLUMN_TYPE: ColumnType = crate::ColumnType::Uuid