Struct TypeRegistry 

pub struct TypeRegistry { /* private fields */ }

A registry mapping PostgreSQL OIDs to custom encode/decode functions.

This allows extensions, custom enums, and composite types to be handled transparently by PgValue::from_text and PgValue::to_text_bytes.

Example

use chopin_pg::types::{TypeRegistry, PgValue};

let mut registry = TypeRegistry::new();
// Register a custom enum type at OID 12345
registry.register_enum(12345, &["active", "inactive", "pending"]);
let val = registry.decode(12345, b"active").unwrap();

Implementations

impl TypeRegistry

pub fn new() -> Self

Create an empty type registry.

pub fn register( &mut self, type_oid: u32, encoder: CustomEncoder, decoder: CustomDecoder, )

Register custom encode and decode functions for a given OID.

pub fn decode(&self, type_oid: u32, data: &[u8]) -> Option<PgResult<PgValue>>

Decode a value using the registered decoder for the given OID. Returns None if no decoder is registered for this OID.

pub fn encode(&self, type_oid: u32, value: &PgValue) -> Option<Option<Vec<u8>>>

Encode a value using the registered encoder for the given OID. Returns None if no encoder is registered for this OID.

pub fn has_decoder(&self, type_oid: u32) -> bool

Check if a decoder is registered for the given OID.

pub fn register_enum(&mut self, type_oid: u32, variants: &[&str])

Register a PostgreSQL enum type.

Enum values are stored as PgValue::Text and validated against the provided variant list on decode. Encoding just returns the text bytes.

Arguments

• type_oid — The OID of the enum type (query pg_type to find it).
• variants — The valid variant labels for this enum.

pub fn register_composite(&mut self, type_oid: u32, field_oids: &[u32])

Register a composite type with named fields and their OIDs.

Composite values are decoded from PostgreSQL’s text representation (parenthesized, comma-separated fields) and stored as PgValue::Array (one element per field). Fields are decoded using their respective OIDs via PgValue::from_text.

Arguments

• type_oid — The OID of the composite type.
• field_oids — The OIDs of each field in order.

Trait Implementations

impl Default for TypeRegistry

fn default() -> Self

Returns the “default value” for a type.