47 lines
1.3 KiB
Elixir
47 lines
1.3 KiB
Elixir
defmodule ElixirAi.Data.DbHelpers do
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require Logger
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@get_named_param ~r/\$\((\w+)\)/
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def run_sql(sql, params, topic) do
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{sql, params} = named_params_to_positional_params(sql, params)
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try do
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Ecto.Adapters.SQL.query!(ElixirAi.Repo, sql, params)
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rescue
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exception ->
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Logger.error("Database error: #{Exception.message(exception)}")
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Phoenix.PubSub.broadcast(
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ElixirAi.PubSub,
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topic,
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{:db_error, Exception.message(exception)}
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)
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{:error, :db_error}
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end
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end
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def named_params_to_positional_params(query, params) do
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param_occurrences = Regex.scan(@get_named_param, query)
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{param_to_index, ordered_values} =
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param_occurrences
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|> Enum.reduce({%{}, []}, fn [_full_match, param_name], {index_map, values} ->
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if Map.has_key?(index_map, param_name) do
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{index_map, values}
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else
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next_index = map_size(index_map) + 1
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param_value = Map.fetch!(params, param_name)
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{Map.put(index_map, param_name, next_index), values ++ [param_value]}
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end
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end)
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positional_sql =
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Regex.replace(@get_named_param, query, fn _full_match, param_name ->
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"$#{param_to_index[param_name]}"
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end)
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{positional_sql, ordered_values}
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end
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end
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