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exosql
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Universal SQL engine for Elixir. This library implements the SQL logic to perform queries on user provided databases using a simple interface based on Foreign Data Wrappers from PostgreSQL.
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lib/datetime.ex
require Logger
defmodule ExoSQL.DateTime do
@moduledoc """
Helpers for datetime
"""
@replacement_re ~r/%i/
def strftime(dt, format) do
dt = to_datetime(dt)
# Simplifications, %i from sqlite is supported
format = format
|> String.replace("%i", "%FT%T%z")
res = Timex.format!(dt, format, :strftime)
|> String.replace("+0000", "Z")
end
def to_datetime(n) when is_number(n) do
{:ok, dt} = DateTime.from_unix(n)
dt
end
def to_datetime(n) when is_binary(n) do
if String.contains?(n, "-") do
case String.length(n) do
10 ->
n = "#{n} 00:00:00Z"
{:ok, td, 0} = DateTime.from_iso8601(n)
td
19 ->
{:ok, td, 0} = DateTime.from_iso8601(n <> "Z")
td
20 ->
{:ok, td, 0} = DateTime.from_iso8601(n)
td
24 ->
{:ok, td, 0} = DateTime.from_iso8601(n)
td
end
else
{:ok, unixtime} = ExoSQL.Utils.to_number(n)
Logger.debug("To datetime #{inspect unixtime}")
to_datetime(unixtime)
end
end
def to_datetime(%DateTime{} = d), do: d
def to_datetime(other) do
raise ArgumentError, message: "cant convert #{inspect other} to date"
end
end