Trait Codec 

pub trait Codec:
    Send
    + Sync
    + Debug {
    // Required methods
    fn name(&self) -> &'static str;
    fn supports(&self, field: &FieldMeta) -> bool;
    fn parse(
        &self,
        field: &FieldMeta,
        input: &str,
    ) -> Result<ScalarValue, String>;

    // Provided methods
    fn format_input(
        &self,
        field: &FieldMeta,
        value: &ScalarValue,
    ) -> Result<String, String> { ... }
    fn format_result(
        &self,
        _field: &FieldMeta,
        value: RowValue,
    ) -> Result<RowValue, String> { ... }
    fn fingerprint(&self) -> u64 { ... }
}

A server-owned input/result conversion codec.

Required Methods

fn name(&self) -> &'static str

Stable name used in schema and policy fingerprints.

fn supports(&self, field: &FieldMeta) -> bool

Whether this codec handles the field.

fn parse(&self, field: &FieldMeta, input: &str) -> Result<ScalarValue, String>

Convert one external value into the field’s validated query value.

Provided Methods

fn format_input( &self, field: &FieldMeta, value: &ScalarValue, ) -> Result<String, String>

Canonical RPC representation. Encoders verify that parsing this text recovers the original database value; lossy codecs must override it.

fn format_result( &self, _field: &FieldMeta, value: RowValue, ) -> Result<RowValue, String>

Convert one decoded result value into its public representation.

fn fingerprint(&self) -> u64

Stable identity including codec configuration.

Dyn Compatibility

This trait is dyn compatible.

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

Implementors

impl Codec for BooleanCodec

impl Codec for DateCodec

Available on crate feature chrono only.

impl Codec for DateTimeCodec

impl Codec for EnumCodec

impl Codec for JsonValueCodec

Available on crate feature json only.

impl Codec for ListResultCodec

impl Codec for ScalarTextCodec

impl Codec for StringCodec

impl Codec for TimeCodec

impl Codec for TimestampCodec