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Fast, simple, and robust Cassandra driver for Elixir.
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lib/xandra/prepared.ex
defmodule Xandra.Prepared do
@moduledoc """
A data structure used to internally represent prepared queries.
"""
defstruct [:statement, :values, :id, :bound_columns, :result_columns]
@opaque t :: %__MODULE__{
statement: Xandra.statement,
values: Xandra.values | nil,
id: binary | nil,
bound_columns: list | nil,
result_columns: list | nil,
}
defimpl DBConnection.Query do
alias Xandra.{Frame, Protocol}
def parse(prepared, _options) do
prepared
end
def encode(prepared, values, options) do
Frame.new(:execute)
|> Protocol.encode_request(%{prepared | values: values}, options)
|> Frame.encode()
end
def decode(prepared, %Frame{} = frame, _options) do
Protocol.decode_response(frame, prepared)
end
def describe(prepared, _options) do
prepared
end
end
defimpl Inspect do
import Inspect.Algebra
def inspect(prepared, options) do
concat(["#Xandra.Prepared<", to_doc(prepared.statement, options), ">"])
end
end
end