epgsql/test/epgsql_SUITE.erl

-module(epgsql_SUITE).

-include_lib("eunit/include/eunit.hrl").
-include_lib("common_test/include/ct.hrl").
-include_lib("public_key/include/public_key.hrl").
-include("epgsql_tests.hrl").
-include("epgsql.hrl").

-export([
    init_per_suite/1,
    init_per_group/2,
    all/0,
    groups/0,
    end_per_group/2,
    end_per_suite/1
]).

-compile(export_all).

modules() ->
    [
     epgsql,
     epgsql_cast,
     epgsql_incremental
    ].

init_per_suite(Config) ->
    Config.

all() ->
    [{group, M} || M <- modules()].

-ifdef(have_maps).
-define(MAPS_TESTS, [
    connect_map
]).
-else.
-define(MAPS_TESTS, []).
-endif.

groups() ->
    Groups = [
        {connect, [parrallel], [
            connect,
            connect_to_db,
            connect_as,
            connect_with_cleartext,
            connect_with_md5,
            connect_with_invalid_user,
            connect_with_invalid_password,
            connect_with_ssl,
            connect_with_client_cert,
            connect_to_closed_port
            | ?MAPS_TESTS
        ]},
        {types, [parallel], [
            numeric_type,
            character_type,
            uuid_type,
            point_type,
            geometry_type,
            uuid_select,
            date_time_type,
            json_type,
            misc_type,
            hstore_type,
            net_type,
            array_type,
            range_type,
            range8_type,
            custom_types
        ]},
        {generic, [parallel], [
            with_transaction
        ]}
    ],

    Tests = [
        {group, connect},
        {group, types},

        prepared_query,
        select,
        insert,
        update,
        delete,
        create_and_drop_table,
        cursor,
        multiple_result,
        execute_batch,
        batch_error,
        single_batch,
        extended_select,
        extended_sync_ok,
        extended_sync_error,
        returning_from_insert,
        returning_from_update,
        returning_from_delete,
        parse,
        parse_column_format,
        parse_error,
        parse_and_close,
        bind,
        bind_parameter_format,
        bind_error,
        bind_and_close,
        execute_error,
        describe,
        describe_with_param,
        describe_named,
        describe_error,
        portal,
        returning,
        multiple_statement,
        multiple_portal,
        execute_function,
        parameter_get,
        parameter_set,

        text_format,
        query_timeout,
        execute_timeout,
        connection_closed,
        connection_closed_by_server,
        active_connection_closed,
        warning_notice,
        listen_notify,
        listen_notify_payload,
        set_notice_receiver,
        get_cmd_status
    ],
    Groups ++ [case Module of
                   epgsql ->
                       {Module, [], [{group, generic} | Tests]};
                   _ ->
                       {Module, [], Tests}
               end || Module <- modules()].

end_per_suite(_Config) ->
    ok.

init_per_group(GroupName, Config) ->
    case lists:member(GroupName, modules()) of
        true -> [{module, GroupName}|Config];
        false -> Config
    end.
end_per_group(_GroupName, _Config) ->
    ok.

-define(UUID1,
        <<163,189,240,40,149,151,17,227,141,6,112,24,139,130,16,73>>).

-define(UUID2,
        <<183,55,22,52,149,151,17,227,187,167,112,24,139,130,16,73>>).

-define(UUID3,
        <<198,188,155,66,149,151,17,227,138,98,112,24,139,130,16,73>>).

-define(TIMEOUT_ERROR, {error, #error{
        severity = error,
        code = <<"57014">>,
        codename = query_canceled,
        message = <<"canceling statement due to statement timeout">>,
        extra = [{file, <<"postgres.c">>},
                 {line, _},
                 {routine, _} | _]
        }}).

%% From uuid.erl in http://gitorious.org/avtobiff/erlang-uuid
uuid_to_bin_string(<<U0:32, U1:16, U2:16, U3:16, U4:48>>) ->
    iolist_to_binary(io_lib:format(
                       "~8.16.0b-~4.16.0b-~4.16.0b-~4.16.0b-~12.16.0b",
                       [U0, U1, U2, U3, U4])).

connect(Config) ->
    epgsql_ct:connect_only(Config, []).

connect_to_db(Connect) ->
    epgsql_ct:connect_only(Connect, [{database, "epgsql_test_db1"}]).

connect_as(Config) ->
    epgsql_ct:connect_only(Config, ["epgsql_test", [{database, "epgsql_test_db1"}]]).

connect_with_cleartext(Config) ->
    epgsql_ct:connect_only(Config, [
        "epgsql_test_cleartext",
        "epgsql_test_cleartext",
        [{database, "epgsql_test_db1"}]
    ]).

connect_with_md5(Config) ->
    epgsql_ct:connect_only(Config, [
        "epgsql_test_md5",
        "epgsql_test_md5",
        [{database, "epgsql_test_db1"}]
    ]).

connect_with_invalid_user(Config) ->
    {Host, Port} = epgsql_ct:connection_data(Config),
    Module = ?config(module, Config),
    {error, Why} = Module:connect(
        Host,
        "epgsql_test_invalid",
        "epgsql_test_invalid",
        [{port, Port}, {database, "epgsql_test_db1"}]),
    case Why of
        invalid_authorization_specification -> ok; % =< 8.4
        invalid_password                    -> ok  % >= 9.0
    end.

connect_with_invalid_password(Config) ->
    {Host, Port} = epgsql_ct:connection_data(Config),
    Module = ?config(module, Config),
    {error, Why} = Module:connect(
        Host,
        "epgsql_test_md5",
        "epgsql_test_invalid",
        [{port, Port}, {database, "epgsql_test_db1"}]),
    case Why of
        invalid_authorization_specification -> ok; % =< 8.4
        invalid_password                    -> ok  % >= 9.0
    end.

connect_with_ssl(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(Config,
        fun(C) ->
             {ok, _Cols, [{true}]} = Module:equery(C, "select ssl_is_used()")
        end,
        "epgsql_test",
        [{ssl, true}]).

connect_with_client_cert(Config) ->
    Module = ?config(module, Config),
    Dir = filename:join(code:lib_dir(epgsql), ?TEST_DATA_DIR),
    File = fun(Name) -> filename:join(Dir, Name) end,
    {ok, Pem} = file:read_file(File("epgsql.crt")),
    [{'Certificate', Der, not_encrypted}] = public_key:pem_decode(Pem),
    Cert = public_key:pkix_decode_cert(Der, plain),
    #'TBSCertificate'{serialNumber = Serial} = Cert#'Certificate'.tbsCertificate,
    Serial2 = list_to_binary(integer_to_list(Serial)),

    epgsql_ct:with_connection(Config,
         fun(C) ->
             {ok, _, [{true}]} = Module:equery(C, "select ssl_is_used()"),
             {ok, _, [{Serial2}]} = Module:equery(C, "select ssl_client_serial()")
         end,
         "epgsql_test_cert",
        [{ssl, true}, {ssl_opts, [{keyfile, File("epgsql.key")},
                                  {certfile, File("epgsql.crt")}]}]).

-ifdef(have_maps).
connect_map(Config) ->
    {Host, Port} = epgsql_ct:connection_data(Config),
    Module = ?config(module, Config),

    Opts = #{
        host => Host,
        port => Port,
        database => "epgsql_test_db1",
        username => "epgsql_test_md5",
        password => "epgsql_test_md5"
    },
    {ok, C} = Module:connect(Opts),
    Module:close(C),
    epgsql_ct:flush(),
    ok.
-endif.

connect_to_closed_port(Config) ->
    {Host, Port} = epgsql_ct:connection_data(Config),
    Module = ?config(module, Config),
    Trap = process_flag(trap_exit, true),
    ?assertEqual({error, econnrefused},
                 Module:connect(
                   Host,
                   "epgsql_test",
                   "epgsql_test",
                   [{port, Port + 1}, {database, "epgsql_test_db1"}])),
    ?assertMatch({'EXIT', _, econnrefused}, receive Stop -> Stop end),
    process_flag(trap_exit, Trap).

prepared_query(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(Config, fun(C) ->
        {ok, _} = Module:parse(C, "inc", "select $1+1", []),
        {ok, Cols, [{5}]} = Module:prepared_query(C, "inc", [4]),
        {ok, Cols, [{2}]} = Module:prepared_query(C, "inc", [1]),
        {ok, Cols, [{23}]} = Module:prepared_query(C, "inc", [22]),
        {error, _} = Module:prepared_query(C, "non_existent_query", [4])
    end).

select(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(Config, fun(C) ->
        {ok, Cols, Rows} = Module:squery(C, "select * from test_table1"),
        [
            #column{name = <<"id">>, type = int4, size = 4},
            #column{name = <<"value">>, type = text, size = -1}
        ] = Cols,
        [{<<"1">>, <<"one">>}, {<<"2">>, <<"two">>}] = Rows
      end).

insert(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_rollback(Config, fun(C) ->
        {ok, 1} = Module:squery(C, "insert into test_table1 (id, value) values (3, 'three')")
    end).

update(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_rollback(Config, fun(C) ->
        {ok, 1} = Module:squery(C, "insert into test_table1 (id, value) values (3, 'three')"),
        {ok, 1} = Module:squery(C, "insert into test_table1 (id, value) values (4, 'four')"),
        {ok, 2} = Module:squery(C, "update test_table1 set value = 'foo' where id > 2"),
        {ok, _, [{<<"2">>}]} = Module:squery(C, "select count(*) from test_table1 where value = 'foo'")
    end).

delete(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_rollback(Config, fun(C) ->
        {ok, 1} = Module:squery(C, "insert into test_table1 (id, value) values (3, 'three')"),
        {ok, 1} = Module:squery(C, "insert into test_table1 (id, value) values (4, 'four')"),
        {ok, 2} = Module:squery(C, "delete from test_table1 where id > 2"),
        {ok, _, [{<<"2">>}]} = Module:squery(C, "select count(*) from test_table1")
    end).

create_and_drop_table(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_rollback(Config, fun(C) ->
        {ok, [], []} = Module:squery(C, "create table test_table3 (id int4)"),
        {ok, [#column{type = int4}], []} = Module:squery(C, "select * from test_table3"),
        {ok, [], []} = Module:squery(C, "drop table test_table3")
    end).

cursor(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(Config, fun(C) ->
        {ok, [], []} = Module:squery(C, "begin"),
        {ok, [], []} = Module:squery(C, "declare c cursor for select id from test_table1"),
        {ok, 2} = Module:squery(C, "move forward 2 from c"),
        {ok, 1} = Module:squery(C, "move backward 1 from c"),
        {ok, 1, _Cols, [{<<"2">>}]} = Module:squery(C, "fetch next from c"),
        {ok, [], []} = Module:squery(C, "close c")
    end).

multiple_result(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(Config, fun(C) ->
        [{ok, _, [{<<"1">>}]}, {ok, _, [{<<"2">>}]}] = Module:squery(C, "select 1; select 2"),
        [{ok, _, [{<<"1">>}]}, {error, #error{}}] = Module:squery(C, "select 1; select foo;")
    end).

execute_batch(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(Config, fun(C) ->
        {ok, S1} = Module:parse(C, "one", "select $1", [int4]),
        {ok, S2} = Module:parse(C, "two", "select $1 + $2", [int4, int4]),
        [{ok, [{1}]}, {ok, [{3}]}] =
            Module:execute_batch(C, [{S1, [1]}, {S2, [1, 2]}])
    end).

batch_error(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_rollback(Config, fun(C) ->
        {ok, S} = Module:parse(C, "insert into test_table1(id, value) values($1, $2)"),
        [{ok, 1}, {error, _}] =
            Module:execute_batch(
              C,
              [{S, [3, "batch_error 3"]},
               {S, [2, "batch_error 2"]}, % duplicate key error
               {S, [5, "batch_error 5"]}  % won't be executed
              ])
    end).

single_batch(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(Config, fun(C) ->
        {ok, S1} = Module:parse(C, "one", "select $1", [int4]),
        [{ok, [{1}]}] = Module:execute_batch(C, [{S1, [1]}])
    end).

extended_select(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(Config, fun(C) ->
        {ok, Cols, Rows} = Module:equery(C, "select * from test_table1", []),
        [#column{name = <<"id">>, type = int4, size = 4},
         #column{name = <<"value">>, type = text, size = -1}] = Cols,
        [{1, <<"one">>}, {2, <<"two">>}] = Rows
    end).

extended_sync_ok(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(Config, fun(C) ->
        {ok, _Cols, [{<<"one">>}]} = Module:equery(C, "select value from test_table1 where id = $1", [1]),
        {ok, _Cols, [{<<"two">>}]} = Module:equery(C, "select value from test_table1 where id = $1", [2])
    end).

extended_sync_error(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(Config, fun(C) ->
        {error, #error{}} = Module:equery(C, "select _alue from test_table1 where id = $1", [1]),
        {ok, _Cols, [{<<"one">>}]} = Module:equery(C, "select value from test_table1 where id = $1", [1])
    end).

returning_from_insert(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_rollback(Config, fun(C) ->
        {ok, 1, _Cols, [{3}]} = Module:equery(C, "insert into test_table1 (id) values (3) returning id")
    end).

returning_from_update(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_rollback(Config, fun(C) ->
        {ok, 2, _Cols, [{1}, {2}]} = Module:equery(C, "update test_table1 set value = 'hi' returning id"),
        ?assertMatch({ok, 0, [#column{}], []},
                     Module:equery(C, "update test_table1 set value = 'hi' where false returning id")),
        ?assertMatch([{ok, 2, [#column{}], [{<<"1">>}, {<<"2">>}]},
               {ok, 0, [#column{}], []}],
                     Module:squery(C,
                            "update test_table1 set value = 'hi2' returning id; "
                            "update test_table1 set value = 'hi' where false returning id"))
    end).

returning_from_delete(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_rollback(Config, fun(C) ->
        {ok, 2, _Cols, [{1}, {2}]} = Module:equery(C, "delete from test_table1 returning id"),
        ?assertMatch({ok, 0, [#column{}], []},
                     Module:equery(C, "delete from test_table1 returning id"))
    end).

parse(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(Config, fun(C) ->
        {ok, S} = Module:parse(C, "select * from test_table1"),
        [#column{name = <<"id">>}, #column{name = <<"value">>}] = S#statement.columns,
        ok = Module:close(C, S),
        ok = Module:sync(C)
    end).

parse_column_format(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(Config, fun(C) ->
        {ok, S} = Module:parse(C, "select 1::int4, false::bool, 2.0::float4"),
        [#column{type = int4},
         #column{type = bool},
         #column{type = float4}] = S#statement.columns,
        ok = Module:bind(C, S, []),
        {ok, [{1, false, 2.0}]} = Module:execute(C, S, 0),
        ok = Module:close(C, S),
        ok = Module:sync(C)
    end).

parse_error(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(Config, fun(C) ->
        {error, #error{
            extra = [{file, _}, {line, _}, {position, <<"8">>}, {routine, _} | _]
        }} = Module:parse(C, "select _ from test_table1"),
        {ok, S} = Module:parse(C, "select * from test_table1"),
        [#column{name = <<"id">>}, #column{name = <<"value">>}] = S#statement.columns,
        ok = Module:close(C, S),
        ok = Module:sync(C)
    end).

parse_and_close(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(Config, fun(C) ->
        Parse = fun() -> Module:parse(C, "test", "select * from test_table1", []) end,
        {ok, S} = Parse(),
        {error, #error{code = <<"42P05">>, codename = duplicate_prepared_statement}} = Parse(),
        Module:close(C, S),
        {ok, S} = Parse(),
        ok = Module:sync(C)
    end).

bind(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(Config, fun(C) ->
        {ok, S} = Module:parse(C, "select value from test_table1 where id = $1"),
        ok = Module:bind(C, S, [1]),
        ok = Module:close(C, S),
        ok = Module:sync(C)
    end).

bind_parameter_format(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(Config, fun(C) ->
        {ok, S} = Module:parse(C, "select $1, $2, $3", [int2, text, bool]),
        [int2, text, bool] = S#statement.types,
        ok = Module:bind(C, S, [1, "hi", true]),
        {ok, [{1, <<"hi">>, true}]} = Module:execute(C, S, 0),
        ok = Module:close(C, S),
        ok = Module:sync(C)
    end).

bind_error(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(Config, fun(C) ->
        {ok, S} = Module:parse(C, "select $1::char"),
        {error, #error{}} = Module:bind(C, S, [0]),
        ok = Module:bind(C, S, [$A]),
        ok = Module:close(C, S),
        ok = Module:sync(C)
    end).

bind_and_close(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(Config, fun(C) ->
        {ok, S} = Module:parse(C, "select * from test_table1"),
        ok = Module:bind(C, S, "one", []),
        {error, #error{code = <<"42P03">>, codename = duplicate_cursor}} = Module:bind(C, S, "one", []),
        ok = Module:close(C, portal, "one"),
        ok = Module:bind(C, S, "one", []),
        ok = Module:sync(C)
    end).

execute_error(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(Config, fun(C) ->
          {ok, S} = Module:parse(C, "insert into test_table1 (id, value) values ($1, $2)"),
          ok = Module:bind(C, S, [1, <<"foo">>]),
          {error, #error{
              code = <<"23505">>, codename = unique_violation,
              extra = [
                  {constraint_name, <<"test_table1_pkey">>},
                  {detail, _},
                  {file, _},
                  {line, _},
                  {routine, _},
                  {schema_name, <<"public">>} | _%,
                  %{table_name, <<"test_table1">>}
              ]
          }} = Module:execute(C, S, 0),
          {error, sync_required} = Module:bind(C, S, [3, <<"quux">>]),
          ok = Module:sync(C),
          ok = Module:bind(C, S, [3, <<"quux">>]),
          {ok, _} = Module:execute(C, S, 0),
          {ok, 1} = Module:squery(C, "delete from test_table1 where id = 3")
    end).

describe(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(Config, fun(C) ->
        {ok, S} = Module:parse(C, "select * from test_table1"),
        [#column{name = <<"id">>}, #column{name = <<"value">>}] = S#statement.columns,
        {ok, S} = Module:describe(C, S),
        ok = Module:close(C, S),
        ok = Module:sync(C)
    end).

describe_with_param(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(Config, fun(C) ->
        {ok, S} = Module:parse(C, "select id from test_table1 where id = $1"),
        ?assertEqual([int4], S#statement.types),
        ?assertMatch([#column{name = <<"id">>}], S#statement.columns),
        {ok, S} = Module:describe(C, S),
        ok = Module:close(C, S),
        ok = Module:sync(C)
    end).

describe_named(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(Config, fun(C) ->
        {ok, S} = Module:parse(C, "name", "select * from test_table1", []),
        [#column{name = <<"id">>}, #column{name = <<"value">>}] = S#statement.columns,
        {ok, S} = Module:describe(C, S),
        ok = Module:close(C, S),
        ok = Module:sync(C)
    end).

describe_error(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(Config, fun(C) ->
        {error, #error{}} = Module:describe(C, statement, ""),
        {ok, S} = Module:parse(C, "select * from test_table1"),
        {ok, S} = Module:describe(C, statement, ""),
        ok = Module:sync(C)

    end).

portal(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(Config, fun(C) ->
        {ok, S} = Module:parse(C, "select value from test_table1"),
        ok = Module:bind(C, S, []),
        {partial, [{<<"one">>}]} = Module:execute(C, S, 1),
        {partial, [{<<"two">>}]} = Module:execute(C, S, 1),
        {ok, []} = Module:execute(C, S,1),
        ok = Module:close(C, S),
        ok = Module:sync(C)
    end).

returning(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_rollback(Config, fun(C) ->
        {ok, S} = Module:parse(C, "update test_table1 set value = $1 returning id"),
        ok = Module:bind(C, S, ["foo"]),
        {ok, 2, [{1}, {2}]} = Module:execute(C, S),
        ok = Module:sync(C)
    end).

multiple_statement(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(Config, fun(C) ->
        {ok, S1} = Module:parse(C, "one", "select value from test_table1 where id = 1", []),
        ok = Module:bind(C, S1, []),
        {partial, [{<<"one">>}]} = Module:execute(C, S1, 1),
        {ok, S2} = Module:parse(C, "two", "select value from test_table1 where id = 2", []),
        ok = Module:bind(C, S2, []),
        {partial, [{<<"two">>}]} = Module:execute(C, S2, 1),
        {ok, []} = Module:execute(C, S1, 1),
        {ok, []} = Module:execute(C, S2, 1),
        ok = Module:close(C, S1),
        ok = Module:close(C, S2),
        ok = Module:sync(C)
    end).

multiple_portal(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(Config, fun(C) ->
        {ok, S} = Module:parse(C, "select value from test_table1 where id = $1"),
        ok = Module:bind(C, S, "one", [1]),
        ok = Module:bind(C, S, "two", [2]),
        {ok, [{<<"one">>}]} = Module:execute(C, S, "one", 0),
        {ok, [{<<"two">>}]} = Module:execute(C, S, "two", 0),
        ok = Module:close(C, S),
        ok = Module:sync(C)
    end).

execute_function(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_rollback(Config, fun(C) ->
        {ok, _Cols1, [{3}]} = Module:equery(C, "select insert_test1(3, 'three')"),
        {ok, _Cols2, [{<<>>}]} = Module:equery(C, "select do_nothing()")
    end).

parameter_get(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(Config, fun(C) ->
        {ok, <<"off">>} = Module:get_parameter(C, "is_superuser")
    end).

parameter_set(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(Config, fun(C) ->
        {ok, [], []} = Module:squery(C, "set DateStyle = 'ISO, MDY'"),
        {ok, <<"ISO, MDY">>} = Module:get_parameter(C, "DateStyle"),
        {ok, _Cols, [{<<"2000-01-02">>}]} = Module:squery(C, "select '2000-01-02'::date"),
        {ok, [], []} = Module:squery(C, "set DateStyle = 'German'"),
        {ok, <<"German, DMY">>} = Module:get_parameter(C, "DateStyle"),
        {ok, _Cols, [{<<"02.01.2000">>}]} = Module:squery(C, "select '2000-01-02'::date")
    end).

numeric_type(Config) ->
    check_type(Config, int2, "1", 1, [0, 256, -32768, +32767]),
    check_type(Config, int4, "1", 1, [0, 512, -2147483648, +2147483647]),
    check_type(Config, int8, "1", 1, [0, 1024, -9223372036854775808, +9223372036854775807]),
    check_type(Config, float4, "1.0", 1.0, [0.0, 1.23456, -1.23456]),
    check_type(Config, float4, "'-Infinity'", minus_infinity, [minus_infinity, plus_infinity, nan]),
    check_type(Config, float8, "1.0", 1.0, [0.0, 1.23456789012345, -1.23456789012345]),
    check_type(Config, float8, "'nan'", nan, [minus_infinity, plus_infinity, nan]).

character_type(Config) ->
    Alpha = unicode:characters_to_binary([16#03B1]),
    Ka    = unicode:characters_to_binary([16#304B]),
    One   = unicode:characters_to_binary([16#10D360]),
    check_type(Config, bpchar, "'A'", $A, [1, $1, 16#7F, Alpha, Ka, One], "c_char"),
    check_type(Config, text, "'hi'", <<"hi">>, [<<"">>, <<"hi">>]),
    check_type(Config, varchar, "'hi'", <<"hi">>, [<<"">>, <<"hi">>]),
    %% Deprecated casts
    epgsql_ct:with_connection(
      Config,
      fun(C) ->
              Module = ?config(module, Config),
              ?assertMatch({ok, _, [{<<"my_atom">>}]},
                           Module:equery(C, "SELECT $1::varchar", [my_atom])),
              ?assertMatch({ok, _, [{<<"12345">>}]},
                           Module:equery(C, "SELECT $1::varchar", [12345])),
              FloatBin = erlang:float_to_binary(1.2345),
              ?assertMatch({ok, _, [{FloatBin}]},
                           Module:equery(C, "SELECT $1::varchar", [1.2345]))
      end).

uuid_type(Config) ->
    check_type(Config, uuid,
               io_lib:format("'~s'", [uuid_to_bin_string(?UUID1)]),
               uuid_to_bin_string(?UUID1), []).

point_type(Config) ->
    check_type(Config, point, "'(23.15, 100)'", {23.15, 100.0}, []).

geometry_type(Config) ->
    check_type(Config, geometry, "'COMPOUNDCURVE(CIRCULARSTRING(0 0,1 1,1 0),(1 0,0 1))'",
        {compound_curve,'2d', [
            {circular_string,'2d', [
                {point,'2d',0.0,0.0,undefined,undefined},
                {point,'2d',1.0,1.0,undefined,undefined},
                {point,'2d',1.0,0.0,undefined,undefined}
            ]},
            {line_string,'2d', [
                {point,'2d',1.0,0.0,undefined,undefined},
                {point,'2d',0.0,1.0,undefined,undefined}
            ]}
        ]}, []).

uuid_select(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_rollback(Config, fun(C) ->
        U1 = uuid_to_bin_string(?UUID1),
        U2 = uuid_to_bin_string(?UUID2),
        U3 = uuid_to_bin_string(?UUID3),
        {ok, 1} =
            Module:equery(C, "insert into test_table2 (c_varchar, c_uuid) values ('UUID1', $1)",
                   [U1]),
        {ok, 1} =
            Module:equery(C, "insert into test_table2 (c_varchar, c_uuid) values ('UUID2', $1)",
                   [U2]),
        {ok, 1} =
            Module:equery(C, "insert into test_table2 (c_varchar, c_uuid) values ('UUID3', $1)",
                   [U3]),
        Res = Module:equery(C, "select c_varchar, c_uuid from test_table2 where c_uuid = any($1)",
                    [[U1, U2]]),
        ?assertMatch(
           {ok,[#column{name = <<"c_varchar">>, type = varchar},
                #column{name = <<"c_uuid">>, type = uuid}],
            [{<<"UUID1">>, U1},
             {<<"UUID2">>, U2}]}, Res)
    end).

date_time_type(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(Config, fun(C) ->
        case Module:get_parameter(C, "integer_datetimes") of
            {ok, <<"on">>}  -> MaxTsDate = 294276;
            {ok, <<"off">>} -> MaxTsDate = 5874897
        end,

        check_type(Config, date, "'2008-01-02'", {2008,1,2}, [{-4712,1,1}, {5874897,1,1}]),
        check_type(Config, time, "'00:01:02'", {0,1,2.0}, [{0,0,0.0}, {24,0,0.0}]),
        check_type(Config, timetz, "'00:01:02-01'", {{0,1,2.0},1*60*60},
                   [{{0,0,0.0},0}, {{24,0,0.0},-13*60*60}]),
        check_type(Config, timestamp, "'2008-01-02 03:04:05'", {{2008,1,2},{3,4,5.0}},
                   [{{-4712,1,1},{0,0,0.0}}, {{MaxTsDate,12,31}, {23,59,59.0}}, {1322,334285,440966}]),
        check_type(Config, timestamptz, "'2011-01-02 03:04:05+3'", {{2011, 1, 2}, {0, 4, 5.0}}, [{1324,875970,286983}]),
        check_type(Config, interval, "'1 hour 2 minutes 3.1 seconds'", {{1,2,3.1},0,0},
                   [{{0,0,0.0},0,-178000000 * 12}, {{0,0,0.0},0,178000000 * 12}])
    end).

json_type(Config) ->
    check_type(Config, json, "'{}'", <<"{}">>,
               [<<"{}">>, <<"[]">>, <<"1">>, <<"1.0">>, <<"true">>, <<"\"string\"">>, <<"{\"key\": []}">>]),
    check_type(Config, jsonb, "'{}'", <<"{}">>,
               [<<"{}">>, <<"[]">>, <<"1">>, <<"1.0">>, <<"true">>, <<"\"string\"">>, <<"{\"key\": []}">>]).

misc_type(Config) ->
    check_type(Config, bool, "true", true, [true, false]),
    check_type(Config, bytea, "E'\001\002'", <<1,2>>, [<<>>, <<0,128,255>>]).

hstore_type(Config) ->
    Values = [
        {[]},
        {[{null, null}]},
        {[{null, undefined}]},
        {[{1, null}]},
        {[{1.0, null}]},
        {[{1, undefined}]},
        {[{1.0, undefined}]},
        {[{<<"a">>, <<"c">>}, {<<"c">>, <<"d">>}]},
        {[{<<"a">>, <<"c">>}, {<<"c">>, null}]},
        {[{<<"a">>, <<"c">>}, {<<"c">>, undefined}]}
    ],
    check_type(Config, hstore, "''", {[]}, []),
    check_type(Config, hstore,
               "'a => 1, b => 2.0, c => null'",
               {[{<<"a">>, <<"1">>}, {<<"b">>, <<"2.0">>}, {<<"c">>, null}]}, Values).

net_type(Config) ->
    check_type(Config, cidr, "'127.0.0.1/32'", {{127,0,0,1}, 32}, [{{127,0,0,1}, 32}, {{0,0,0,0,0,0,0,1}, 128}]),
    check_type(Config, inet, "'127.0.0.1'", {127,0,0,1}, [{127,0,0,1}, {0,0,0,0,0,0,0,1}]),
    %% macaddr8 available only on PG>=10
    check_type(Config, macaddr,
               "'FF:FF:FF:FF:FF:FF'", {255, 255, 255, 255, 255, 255},
               [{255, 255, 255, 255, 255, 255},
                {6, 0, 0, 0, 0, 0}]).

array_type(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(Config, fun(C) ->
        {ok, _, [{[1, 2]}]} = Module:equery(C, "select ($1::int[])[1:2]", [[1, 2, 3]]),
        {ok, _, [{[{1, <<"one">>}, {2, <<"two">>}]}]} =
            Module:equery(C, "select Array(select (id, value) from test_table1)", []),
        Select = fun(Type, A) ->
            Query = "select $1::" ++ atom_to_list(Type) ++ "[]",
            {ok, _Cols, [{A2}]} = Module:equery(C, Query, [A]),
            case lists:all(fun({V, V2}) -> compare(Type, V, V2) end, lists:zip(A, A2)) of
                true  -> ok;
                false -> ?assertMatch(A, A2)
            end
        end,
        Select(int2,   []),
        Select(int2,   [1, 2, 3, 4]),
        Select(int2,   [[1], [2], [3], [4]]),
        Select(int2,   [[[[[[1, 2]]]]]]),
        Select(bool,   [true]),
        Select(char,   [$a, $b, $c]),
        Select(int4,   [[1, 2]]),
        Select(int8,   [[[[1, 2]], [[3, 4]]]]),
        Select(text,   [<<"one">>, <<"two>">>]),
        Select(varchar,   [<<"one">>, <<"two>">>]),
        Select(float4, [0.0, 1.0, 0.123]),
        Select(float8, [0.0, 1.0, 0.123]),
        Select(date, [{2008,1,2}, {2008,1,3}]),
        Select(time, [{0,1,2.0}, {0,1,3.0}]),
        Select(timetz, [{{0,1,2.0},1*60*60}, {{0,1,3.0},1*60*60}]),
        Select(timestamp, [{{2008,1,2},{3,4,5.0}}, {{2008,1,2},{3,4,6.0}}]),
        Select(timestamptz, [{{2008,1,2},{3,4,5.0}}, {{2008,1,2},{3,4,6.0}}]),
        Select(interval, [{{1,2,3.1},0,0}, {{1,2,3.2},0,0}]),
        Select(hstore, [{[{null, null}, {a, 1}, {1, 2}, {b, undefined}]}]),
        Select(hstore, [[{[{null, null}, {a, 1}, {1, 2}, {b, undefined}]}, {[]}], [{[{a, 1}]}, {[{null, 2}]}]]),
        Select(cidr, [{{127,0,0,1}, 32}, {{0,0,0,0,0,0,0,1}, 128}]),
        Select(inet, [{127,0,0,1}, {0,0,0,0,0,0,0,1}]),
        Select(json, [<<"{}">>, <<"[]">>, <<"1">>, <<"1.0">>, <<"true">>, <<"\"string\"">>, <<"{\"key\": []}">>]),
        Select(jsonb, [<<"{}">>, <<"[]">>, <<"1">>, <<"1.0">>, <<"true">>, <<"\"string\"">>, <<"{\"key\": []}">>])
    end).

custom_types(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(Config, fun(C) ->
        Module:squery(C, "drop table if exists t_foo;"),
        Module:squery(C, "drop type if exists my_type;"),
        {ok, [], []} = Module:squery(C, "create type my_type as enum('foo', 'bar');"),
        {ok, [my_type]} = epgsql:update_type_cache(C, [{epgsql_codec_test_enum, [foo, bar]}]),
        {ok, [], []} = Module:squery(C, "create table t_foo (col my_type);"),
        {ok, S} = Module:parse(C, "insert_foo", "insert into t_foo values ($1)", [my_type]),
        ok = Module:bind(C, S, [bar]),
        {ok, 1} = Module:execute(C, S),
        ?assertMatch({ok, _, [{bar}]}, Module:equery(C, "SELECT col FROM t_foo"))
    end).

text_format(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(Config, fun(C) ->
        Select = fun(Type, V) ->
            V2 = list_to_binary(V),
            Query = "select $1::" ++ Type,
            ?assertMatch({ok, _Cols, [{V2}]}, Module:equery(C, Query, [V])),
            ?assertMatch({ok, _Cols, [{V2}]}, Module:equery(C, Query, [V2]))
        end,
        Select("numeric", "123456")
    end).

query_timeout(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(Config, fun(C) ->
        {ok, _, _} = Module:squery(C, "SET statement_timeout = 500"),
        ?TIMEOUT_ERROR = Module:squery(C, "SELECT pg_sleep(1)"),
        ?TIMEOUT_ERROR = Module:equery(C, "SELECT pg_sleep(2)"),
        {ok, _Cols, [{1}]} = Module:equery(C, "SELECT 1")
    end, []).

execute_timeout(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(Config, fun(C) ->
        {ok, _, _} = Module:squery(C, "SET statement_timeout = 500"),
        {ok, S} = Module:parse(C, "select pg_sleep($1)"),
        ok = Module:bind(C, S, [2]),
        ?TIMEOUT_ERROR = Module:execute(C, S, 0),
        ok = Module:sync(C),
        ok = Module:bind(C, S, [0]),
        {ok, [{<<>>}]} = Module:execute(C, S, 0),
        ok = Module:close(C, S),
        ok = Module:sync(C)
    end, []).

connection_closed(Config) ->
    {Host, Port} = epgsql_ct:connection_data(Config),
    Module = ?config(module, Config),
    P = self(),
    spawn_link(fun() ->
        process_flag(trap_exit, true),
        {ok, C} = Module:connect(Host, "epgsql_test",[
            {port, Port},
            {database, "epgsql_test_db1"}
        ]),
        P ! {connected, C},
        receive
            Any -> P ! Any
        end
    end),
    receive
        {connected, C} ->
            timer:sleep(100),
            Module:close(C),
            {'EXIT', C, _} = receive R -> R end
    end,
    epgsql_ct:flush().

connection_closed_by_server(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(Config, fun(C1) ->
        P = self(),
        spawn_link(fun() ->
            process_flag(trap_exit, true),
            epgsql_ct:with_connection(Config, fun(C2) ->
                {ok, _, [{Pid}]} = Module:equery(C2, "select pg_backend_pid()"),
                % emulate of disconnection
                {ok, _, [{true}]} = Module:equery(C1,
                "select pg_terminate_backend($1)", [Pid]),
                receive
                    {'EXIT', C2, {shutdown, #error{code = <<"57P01">>}}} ->
                        P ! ok;
                    Other ->
                        ?debugFmt("Unexpected msg: ~p~n", [Other]),
                        P ! error
                end
            end)
        end),
        receive ok -> ok end
    end).

active_connection_closed(Config) ->
    {Host, Port} = epgsql_ct:connection_data(Config),
    Module = ?config(module, Config),
    P = self(),
    F = fun() ->
          process_flag(trap_exit, true),
          {ok, C} = Module:connect(Host, [
              {database, "epgsql_test_db1"},
              {port, Port}
          ]),
          P ! {connected, C},
          R = Module:squery(C, "select pg_sleep(10)"),
          P ! R
        end,
    spawn_link(F),
    receive
        {connected, C} ->
            timer:sleep(100),
            Module:close(C),
            {error, closed} = receive R -> R end
    end,
    epgsql_ct:flush().

warning_notice(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(Config, fun(C) ->
        Q = "create function pg_temp.raise() returns void as $$
             begin
               raise warning 'oops';
             end;
             $$ language plpgsql;
             select pg_temp.raise()",
        [{ok, _, _}, _] = Module:squery(C, Q),
        receive
            {epgsql, C, {notice, #error{message = <<"oops">>, extra = Extra}}} ->
                ?assertMatch([{file, _},{line, _},{routine, _} | _], Extra),
                ok
        after
            100 -> erlang:error(didnt_receive_notice)
        end
    end, [{async, self()}]).

listen_notify(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(Config, fun(C) ->
        {ok, [], []}     = Module:squery(C, "listen epgsql_test"),
        {ok, _, [{Pid}]} = Module:equery(C, "select pg_backend_pid()"),
        {ok, [], []}     = Module:squery(C, "notify epgsql_test"),
        receive
            {epgsql, C, {notification, <<"epgsql_test">>, Pid, <<>>}} -> ok
        after
            100 -> erlang:error(didnt_receive_notification)
        end
    end, [{async, self()}]).

listen_notify_payload(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_min_version(Config, 9.0, fun(C) ->
        {ok, [], []}     = Module:squery(C, "listen epgsql_test"),
        {ok, _, [{Pid}]} = Module:equery(C, "select pg_backend_pid()"),
        {ok, [], []}     = Module:squery(C, "notify epgsql_test, 'test!'"),
        receive
            {epgsql, C, {notification, <<"epgsql_test">>, Pid, <<"test!">>}} -> ok
        after
            100 -> erlang:error(didnt_receive_notification)
        end
    end, [{async, self()}]).

set_notice_receiver(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_min_version(Config, 9.0, fun(C) ->
        {ok, [], []}     = Module:squery(C, "listen epgsql_test"),
        {ok, _, [{Pid}]} = Module:equery(C, "select pg_backend_pid()"),

        EnsureNoNotification = fun(Payload) ->
            {ok, [], []}     = Module:squery(C, ["notify epgsql_test, '", Payload, "'"]),
            receive
                {epgsql, _, _} -> erlang:error(got_unexpected_notification)
            after
                10 -> ok
            end
        end,
        EnsureNotification = fun(Payload) ->
            {ok, [], []}     = Module:squery(C, ["notify epgsql_test, '", Payload, "'"]),
            receive
                {epgsql, C, {notification, <<"epgsql_test">>, Pid, Payload}} -> ok
            after
                100 -> erlang:error(didnt_receive_notification)
            end
        end,
        Self = self(),

        EnsureNoNotification(<<"test1">>),

        % Set pid()
        {ok, undefined} = Module:set_notice_receiver(C, Self),
        EnsureNotification(<<"test2">>),

        %% test PL/PgSQL NOTICE
        {ok, [], []} = Module:squery(C, ["DO $$ BEGIN RAISE WARNING 'test notice'; END $$;"]),
        receive
            {epgsql, C, {notice, #error{severity = warning,
                         code = <<"01000">>,
                         message = <<"test notice">>,
                         extra = _}}} -> ok
        after
           100 -> erlang:error(didnt_receive_notice)
        end,

        % set registered pid
        Receiver = pg_notification_receiver,
        register(Receiver, Self),
        {ok, Self} = Module:set_notice_receiver(C, Receiver),
        EnsureNotification(<<"test3">>),

        % make registered name invalid
        unregister(Receiver),
        EnsureNoNotification(<<"test4">>),

        % disable
        {ok, Receiver} = Module:set_notice_receiver(C, undefined),
        EnsureNoNotification(<<"test5">>)
    end, []).

get_cmd_status(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(Config, fun(C) ->
        {ok, [], []} = Module:squery(C, "BEGIN"),
        ?assertEqual({ok, 'begin'}, Module:get_cmd_status(C)),
        {ok, [], []} = epgsql:equery(C, "CREATE TEMPORARY TABLE cmd_status_t(col INTEGER)"),
        ?assertEqual({ok, 'create'}, Module:get_cmd_status(C)),
        %% Some commands have number of affected rows in status
        {ok, N} = Module:squery(C, "INSERT INTO cmd_status_t (col) VALUES (1), (2)"),
        ?assertEqual({ok, {'insert', N}}, Module:get_cmd_status(C)),
        {ok, 1} = Module:squery(C, "UPDATE cmd_status_t SET col=3 WHERE col=1"),
        ?assertEqual({ok, {'update', 1}}, Module:get_cmd_status(C)),
        %% Failed queries have no status
        {error, _} = Module:squery(C, "DELETE FROM cmd_status_t WHERE not_col=2"),
        ?assertEqual({ok, undefined}, Module:get_cmd_status(C)),
        %% if COMMIT failed, status will be 'rollback'
        {ok, [], []} = Module:squery(C, "COMMIT"),
        ?assertEqual({ok, 'rollback'}, Module:get_cmd_status(C)),
        %% Only last command's status returned
        [_, _, _] = Module:squery(C, "BEGIN; SELECT 1; COMMIT"),
        ?assertEqual({ok, 'commit'}, Module:get_cmd_status(C))
    end).

range_type(Config) ->
    epgsql_ct:with_min_version(Config, 9.2, fun(_C) ->
        check_type(Config, int4range, "int4range(10, 20)", {10, 20}, [
            {1, 58}, {-1, 12}, {-985521, 5412687}, {minus_infinity, 0},
            {984655, plus_infinity}, {minus_infinity, plus_infinity}
        ])
   end, []).

range8_type(Config) ->
    epgsql_ct:with_min_version(Config, 9.2, fun(_C) ->
        check_type(Config, int8range, "int8range(10, 20)", {10, 20}, [
            {1, 58}, {-1, 12}, {-9223372036854775808, 5412687},
            {minus_infinity, 9223372036854775807},
            {984655, plus_infinity}, {minus_infinity, plus_infinity}
        ])
    end, []).


with_transaction(Config) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(
      Config,
      fun(C) ->
              %% Success case
              ?assertEqual(
                 success, Module:with_transaction(C, fun(_) -> success end)),
              ?assertEqual(
                 success, Module:with_transaction(C, fun(_) -> success end,
                                                  [{ensure_committed, true}])),
              %% begin_opts
              ?assertMatch(
                 [{ok, _, [{<<"serializable">>}]},
                  {ok, _, [{<<"on">>}]}],
                 Module:with_transaction(
                   C, fun(C1) ->
                              Module:squery(C1, ("SHOW transaction_isolation; "
                                                 "SHOW transaction_read_only"))
                      end,
                   [{begin_opts, "READ ONLY ISOLATION LEVEL SERIALIZABLE"}])),
              %% ensure_committed failure
              ?assertError(
                 {ensure_committed_failed, rollback},
                 Module:with_transaction(
                   C, fun(C1) ->
                              {error, _} = Module:squery(C1, "SELECT col FROM _nowhere_"),
                              ok
                      end,
                   [{ensure_committed, true}])),
              %% reraise
              ?assertEqual(
                 {rollback, my_err},
                 Module:with_transaction(
                   C, fun(_) -> error(my_err) end,
                   [{reraise, false}])),
              ?assertError(
                 my_err,
                 Module:with_transaction(
                   C, fun(_) -> error(my_err) end, []))
      end, []).

%% =============================================================================
%% Internal functions
%% ============================================================================

check_type(Config, Type, In, Out, Values) ->
    Column = "c_" ++ atom_to_list(Type),
    check_type(Config, Type, In, Out, Values, Column).

check_type(Config, Type, In, Out, Values, Column) ->
    Module = ?config(module, Config),
    epgsql_ct:with_connection(Config, fun(C) ->
        Select = io_lib:format("select ~s::~w", [In, Type]),
        Res = Module:equery(C, Select),
        ?assertMatch({ok, [#column{type = Type}], [{Out}]}, Res),
        Sql = io_lib:format("insert into test_table2 (~s) values ($1) returning ~s", [Column, Column]),
        {ok, #statement{columns = [#column{type = Type}]} = S} = Module:parse(C, Sql),
        Insert = fun(V) ->
            ok = Module:bind(C, S, [V]),
            {ok, 1, [{V2}]} = Module:execute(C, S),
            case compare(Type, V, V2) of
                true  -> ok;
                false ->
                    error({write_read_compare_failed,
                           iolist_to_binary(
                             io_lib:format("~p =/= ~p~n", [V, V2]))})
            end,
            ok = Module:sync(C)
        end,
        lists:foreach(Insert, [null, undefined | Values])
    end).

compare(_Type, null, null)      -> true;
compare(_Type, undefined, null) -> true;
compare(float4, V1, V2) when is_float(V1) -> abs(V2 - V1) < 0.000001;
compare(float8, V1, V2) when is_float(V1) -> abs(V2 - V1) < 0.000000000000001;
compare(hstore, {V1}, V2)       -> compare(hstore, V1, V2);
compare(hstore, V1, {V2})       -> compare(hstore, V1, V2);
compare(hstore, V1, V2)         ->
    orddict:from_list(format_hstore(V1)) =:= orddict:from_list(format_hstore(V2));
compare(Type, V1 = {_, _, MS}, {D2, {H2, M2, S2}}) when Type == timestamp;
                                                        Type == timestamptz ->
    {D1, {H1, M1, S1}} = calendar:now_to_universal_time(V1),
    ({D1, H1, M1} =:= {D2, H2, M2}) and (abs(S1 + MS/1000000 - S2) < 0.000000000000001);
compare(_Type, V1, V2)     -> V1 =:= V2.

format_hstore({Hstore}) -> Hstore;
format_hstore(Hstore) ->
    [{format_hstore_key(Key), format_hstore_value(Value)} || {Key, Value} <- Hstore].

format_hstore_key(Key) -> format_hstore_string(Key).

format_hstore_value(null) -> null;
format_hstore_value(undefined) -> null;
format_hstore_value(Value) -> format_hstore_string(Value).

format_hstore_string(Num) when is_number(Num) -> iolist_to_binary(io_lib:format("~w", [Num]));
format_hstore_string(Str) -> iolist_to_binary(io_lib:format("~s", [Str])).