glite/decode

Types

opaque </>

A decoder that extracts a typed value from a row (list of columns).

pub opaque type RowDecoder(a)

</>

A decoder that extracts a typed value from a single cell.

pub type ValueDecoder(a) =
  fn(value.Value) -> Result(a, error.Error)

</>

pub fn blob(val: value.Value) -> Result(BitArray, error.Error)

Decode a blob (binary data) value.

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pub fn bool(val: value.Value) -> Result(Bool, error.Error)

Decode a boolean value (SQLite stores as Integer 0/1).

</>

pub fn dynamic(
  val: value.Value,
) -> Result(value.Value, error.Error)

Decode any value as-is (always succeeds, returns the raw Value).

</>

pub fn element(
  index: Int,
  decoder: fn(value.Value) -> Result(a, error.Error),
  next: fn(a) -> RowDecoder(b),
) -> RowDecoder(b)

Decode the element at a given column index using a value decoder. Designed for use with Gleam’s use syntax.

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pub fn float(val: value.Value) -> Result(Float, error.Error)

Decode a float value.

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pub fn int(val: value.Value) -> Result(Int, error.Error)

Decode an integer value.

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pub fn optional(
  decoder: fn(value.Value) -> Result(a, error.Error),
) -> fn(value.Value) -> Result(option.Option(a), error.Error)

Make any value decoder nullable (NULL-safe). Returns Ok(None) for NULL, Ok(Some(val)) for non-NULL.

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pub fn run(
  decoder: RowDecoder(a),
  row: List(value.Value),
) -> Result(a, error.Error)

Run a decoder on a row.

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pub fn success(value: a) -> RowDecoder(a)

Finalize a decoder chain with a value.

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pub fn text(val: value.Value) -> Result(String, error.Error)

Decode a text/string value.