defmodule Jamdb.Sybase do
@vsn "0.7.13"
@moduledoc """
Adapter module for Sybase. `DBConnection` behaviour implementation.
It uses `jamdb_sybase` for communicating to the database.
"""
use DBConnection
@timeout 15_000
@idle_interval 5_000
defstruct [:conn, :mode, :cursors, :timeout, :idle_interval]
@doc """
Starts and links to a database connection process.
See [`Ecto.Adapters.Jamdb.Sybase`](Ecto.Adapters.Jamdb.Sybase.html#module-connection-options).
By default the `DBConnection` starts a pool with a single connection.
The size of the pool can be increased with `:pool_size`. The ping interval
to validate an idle connection can be given with the `:idle_interval` option.
"""
@spec start_link(opts :: Keyword.t) ::
{:ok, any()} | {:error, any()}
def start_link(opts) do
DBConnection.start_link(Jamdb.Sybase, opts)
end
@doc """
Runs the SQL statement.
See `DBConnection.prepare_execute/4`.
In case of success, it must return an `:ok` tuple containing
a map with at least two keys:
* `:num_rows` - the number of rows affected
* `:rows` - the result set as a list
"""
@spec query(conn :: any(), sql :: any(), params :: any()) ::
{:ok, any(), new_state :: any()} | {:error | :disconnect, any(), new_state :: any()}
def query(conn, sql, params \\ [])
def query(%{conn: conn, timeout: timeout} = s, sql, params) do
case sql_query(conn, sql, params, timeout) do
{:ok, [{:result_set, columns, _, rows}], conn} ->
{:ok, %{num_rows: length(rows), rows: rows, columns: columns}, %{s | conn: conn}}
{:ok, [{:proc_result, 0, rows}], conn} -> {:ok, %{num_rows: length(rows), rows: rows}, %{s | conn: conn}}
{:ok, [{:proc_result, _, msg}], conn} -> {:error, msg, %{s | conn: conn}}
{:ok, [{:affected_rows, num_rows}], conn} -> {:ok, %{num_rows: num_rows, rows: nil}, %{s | conn: conn}}
{:ok, result, conn} -> {:ok, result, %{s | conn: conn}}
{:error, err, conn} -> {:disconnect, err, conn}
end
end
defp sql_query(conn, sql, [], timeout) do
try do
case :jamdb_sybase_conn.sql_query(conn, sql, timeout) do
{:ok, result, conn} -> {:ok, result, conn}
{:error, _, err, conn} -> {:error, err, conn}
end
catch
_, err -> {:error, err, conn}
end
end
defp sql_query(conn, sql, params, timeout) do
try do
name = "dyn" <> Integer.to_string(:erlang.crc32(sql))
{:ok, conn} = :jamdb_sybase_conn.prepare(conn, name, sql)
case :jamdb_sybase_conn.execute(conn, name, params, timeout) do
{:ok, result, conn} ->
{:ok, conn} = :jamdb_sybase_conn.unprepare(conn, name)
{:ok, result, conn}
{:error, _, err, conn} -> {:error, err, conn}
end
catch
_, err -> {:error, err, conn}
end
end
@impl true
def connect(opts) do
host = opts[:hostname] |> Jamdb.Sybase.to_list
port = opts[:port]
timeout = opts[:timeout] || @timeout
idle_interval = opts[:idle_interval] || @idle_interval
user = opts[:username] |> Jamdb.Sybase.to_list
password = opts[:password] |> Jamdb.Sybase.to_list
database = opts[:database] |> Jamdb.Sybase.to_list
env = [host: host, port: port, timeout: timeout, idle_interval: idle_interval,
user: user, password: password, database: database]
params = opts[:parameters] || []
sock_opts = opts[:socket_options] || []
case :jamdb_sybase_conn.connect(sock_opts ++ params ++ env) do
{:ok, conn} -> {:ok, %Jamdb.Sybase{conn: conn, mode: :idle, timeout: timeout, idle_interval: idle_interval}}
{:ok, msg, _conn} -> {:error, error!(msg)}
{:error, _, err, _conn} -> {:error, error!(err)}
end
end
@impl true
def disconnect(_err, %{conn: conn}) do
try do
:jamdb_sybase_conn.disconnect(conn)
catch
_, _ -> :error
end
:ok
end
@impl true
def handle_execute(query, params, _opts, s) do
%Jamdb.Sybase.Query{statement: statement} = query
case query(s, statement |> Jamdb.Sybase.to_list, params) do
{:ok, result, s} -> {:ok, query, result, s}
{:error, err, s} -> {:error, error!(err), s}
{:disconnect, err, s} -> {:disconnect, error!(err), s}
end
end
@impl true
def handle_prepare(query, opts, s) do
timeout = opts[:timeout] || @timeout
{:ok, query, %{s | timeout: timeout}}
end
@impl true
def handle_begin(opts, %{mode: mode} = s) do
case Keyword.get(opts, :mode, :transaction) do
:transaction when mode == :idle ->
statement = "BEGIN TRANSACTION"
handle_transaction(statement, opts, %{s | mode: :transaction})
:savepoint when mode == :transaction ->
statement = "SAVE TRANSACTION " <> Keyword.get(opts, :name, "svpt")
handle_transaction(statement, opts, %{s | mode: :transaction})
status when status in [:transaction, :savepoint] ->
{status, s}
end
end
@impl true
def handle_commit(opts, %{mode: mode} = s) do
case Keyword.get(opts, :mode, :transaction) do
:transaction when mode == :transaction ->
statement = "COMMIT TRANSACTION"
handle_transaction(statement, opts, %{s | mode: :idle})
:savepoint when mode == :transaction ->
{:ok, [], %{s | mode: :transaction}}
status when status in [:transaction, :savepoint] ->
{status, s}
end
end
@impl true
def handle_rollback(opts, %{mode: mode} = s) do
case Keyword.get(opts, :mode, :transaction) do
:transaction when mode in [:transaction, :error] ->
statement = "ROLLBACK TRANSACTION"
handle_transaction(statement, opts, %{s | mode: :idle})
:savepoint when mode in [:transaction, :error] ->
statement = "ROLLBACK TRANSACTION " <> Keyword.get(opts, :name, "svpt")
handle_transaction(statement, opts, %{s | mode: :transaction})
status when status in [:transaction, :savepoint] ->
{status, s}
end
end
defp handle_transaction(statement, _opts, s) do
case query(s, statement |> Jamdb.Sybase.to_list) do
{:ok, result, s} -> {:ok, result, s}
{:error, err, s} -> {:error, error!(err), s}
{:disconnect, err, s} -> {:disconnect, error!(err), s}
end
end
@impl true
def handle_declare(query, params, _opts, s) do
{:ok, query, %{params: params}, s}
end
@impl true
def handle_fetch(query, %{params: params}, _opts, %{cursors: nil} = s) do
%Jamdb.Sybase.Query{statement: statement} = query
case query(s, statement |> Jamdb.Sybase.to_list, params) do
{:ok, result, s} ->
{:halt, result, s}
{:error, err, s} -> {:error, error!(err), s}
{:disconnect, err, s} -> {:disconnect, error!(err), s}
end
end
@impl true
def handle_deallocate(_query, _cursor, _opts, s) do
{:ok, nil, %{s | cursors: nil}}
end
@impl true
def handle_close(_query, _opts, s) do
{:ok, nil, s}
end
@impl true
def handle_status(_opts, %{mode: mode} = s) do
{mode, s}
end
@doc false
def checkin(s) do
{:ok, s}
end
@impl true
def checkout(%{conn: conn, timeout: timeout} = s) do
case sql_query(conn, 'SET CHAINED off', [], timeout) do
{:ok, _, _conn} -> {:ok, s}
{:error, err, _conn} -> {:disconnect, error!(err), s}
end
end
@impl true
def ping(%{conn: conn, timeout: timeout, idle_interval: idle_interval} = s) do
case sql_query(conn, 'SELECT 1', [], min(timeout, idle_interval)) do
{:ok, _, _conn} -> {:ok, s}
{:error, err, _conn} -> {:disconnect, error!(err), s}
end
end
defp error!(msg) do
DBConnection.ConnectionError.exception("#{inspect msg}")
end
@doc """
Returns the configured JSON library.
To customize the JSON library, include the following in your `config/config.exs`:
config :jamdb_sybase, :json_library, SomeJSONModule
Defaults to [`Jason`](https://hexdocs.pm/jason)
"""
@spec json_library() :: module()
def json_library() do
Application.get_env(:jamdb_sybase, :json_library, Jason)
end
@doc false
def to_list(string) when is_binary(string) do
:binary.bin_to_list(string)
end
@doc false
defdelegate loaders(t, type), to: Ecto.Adapters.Jamdb.Sybase
@doc false
defdelegate dumpers(t, type), to: Ecto.Adapters.Jamdb.Sybase
end
defimpl DBConnection.Query, for: Jamdb.Sybase.Query do
def parse(query, _), do: query
def describe(query, _), do: query
def decode(_, %{rows: []} = result, _), do: result
def decode(_, %{rows: rows} = result, opts) when rows != nil,
do: %{result | rows: Enum.map(rows, fn row -> decode(row, opts[:decode_mapper]) end)}
def decode(_, result, _), do: result
defp decode(row, nil), do: Enum.map(row, fn elem -> decode(elem) end)
defp decode(row, mapper), do: mapper.(decode(row, nil))
defp decode(:null), do: nil
defp decode(elem) when is_number(elem), do: elem
defp decode({sign, coef, exp}) when exp < 0, do: Decimal.new(sign, coef, exp)
defp decode({date, time}) when is_tuple(date), do: to_naive({date, time})
defp decode(elem) when is_tuple(elem), do: to_date_time(elem)
defp decode(elem) when is_list(elem), do: to_binary(elem)
defp decode(elem), do: elem
def encode(_, [], _), do: []
def encode(_, params, opts) do
types = Enum.map(Keyword.get(opts, :in, []), fn elem -> elem end)
Enum.map(encode(params, types), fn elem -> encode(elem) end)
end
defp encode(params, []), do: params
defp encode([%Ecto.Query.Tagged{type: :binary} = elem | next1], [_type | next2]),
do: [ elem | encode(next1, next2)]
defp encode([elem | next1], [type | next2]) when type in [:binary, :binary_id, Ecto.UUID],
do: [ %Ecto.Query.Tagged{value: elem, type: :binary} | encode(next1, next2)]
defp encode([elem | next1], [_type | next2]), do: [ elem | encode(next1, next2)]
defp encode(nil), do: :null
defp encode(true), do: [49]
defp encode(false), do: [48]
defp encode(%Decimal{} = decimal), do: Decimal.to_float(decimal)
defp encode(%DateTime{} = datetime), do: NaiveDateTime.to_erl(DateTime.to_naive(datetime))
defp encode(%NaiveDateTime{} = naive), do: NaiveDateTime.to_erl(naive)
defp encode(%Date{} = date), do: Date.to_erl(date)
defp encode(%Time{} = time), do: Time.to_erl(time)
defp encode(%Ecto.Query.Tagged{value: elem, type: :binary}) when is_binary(elem), do: elem
defp encode(elem) when is_binary(elem), do: Jamdb.Sybase.to_list(elem)
defp encode(elem) when is_map(elem),
do: encode(Jamdb.Sybase.json_library().encode!(elem))
defp encode(elem), do: elem
defp expr(list) when is_list(list) do
Enum.map(list, fn
:null -> nil
elem -> elem
end)
end
defp to_binary(list) when is_list(list) do
try do
:binary.list_to_bin(list)
rescue
ArgumentError ->
Enum.map(expr(list), fn
elem when is_list(elem) -> expr(elem)
other -> other
end) |> Enum.join
end
end
defp to_date_time({hour, min, sec}) when hour in 0..23 and min in 0..59 and sec in 0..60,
do: Time.from_erl!({hour, min, sec})
defp to_date_time(date),
do: Date.from_erl!(date)
defp to_naive({date, {hour, min, sec}}),
do: NaiveDateTime.from_erl!({date, {hour, min, sec}})
end
