postgleam - v0.8.0

postgleam/codec

Types

Codec

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A resolved codec that can encode and decode values for a specific OID

pub type Codec {
  Codec(
    type_name: String,
    oid: Int,
    format: Format,
    encode: fn(value.Value) -> Result(BitArray, String),
    decode: fn(BitArray) -> Result(value.Value, String),
  )
}

Constructors 

  • Codec(
  type_name: String,
  oid: Int,
  format: Format,
  encode: fn(value.Value) -> Result(BitArray, String),
  decode: fn(BitArray) -> Result(value.Value, String),
)

    Arguments

    type_name

    PostgreSQL type name (e.g. “bool”, “int4”)

    oid

    OID of this type

    format

    Wire format this codec uses

    encode

    Encode a Value to binary payload (without length header)

    decode

    Decode binary payload (without length header) to a Value

CodecMatcher

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A codec matcher - used to build the registry by matching OIDs to codecs

pub type CodecMatcher {
  CodecMatcher(
    type_name: String,
    oids: List(Int),
    send: option.Option(String),
    format: Format,
    build: fn(Int) -> Codec,
  )
}

Constructors 

  • CodecMatcher(
  type_name: String,
  oids: List(Int),
  send: option.Option(String),
  format: Format,
  build: fn(Int) -> Codec,
)

    Arguments

    type_name

    PostgreSQL type name

    oids

    Known OIDs this matcher handles (empty = match by send function)

    send

    PostgreSQL send function name (for matching by catalog)

    format

    Wire format

    build

    Create a codec for a given OID

Format

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Wire format: binary or text

pub type Format {
  Binary
  Text
}

Constructors 

  • Binary
  • Text
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