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| author | Erlang/OTP <[email protected]> | 2009-11-20 14:54:40 +0000 |
|---|---|---|
| committer | Erlang/OTP <[email protected]> | 2009-11-20 14:54:40 +0000 |
| commit | 84adefa331c4159d432d22840663c38f155cd4c1 (patch) | |
| tree | bff9a9c66adda4df2106dfd0e5c053ab182a12bd /erts/example/pg_async.erl | |
| download | otp-84adefa331c4159d432d22840663c38f155cd4c1.tar.gz otp-84adefa331c4159d432d22840663c38f155cd4c1.tar.bz2 otp-84adefa331c4159d432d22840663c38f155cd4c1.zip | |
The R13B03 release.OTP_R13B03
Diffstat (limited to 'erts/example/pg_async.erl')
| -rw-r--r-- | erts/example/pg_async.erl | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/erts/example/pg_async.erl b/erts/example/pg_async.erl new file mode 100644 index 0000000000..10506bfe9f --- /dev/null +++ b/erts/example/pg_async.erl @@ -0,0 +1,57 @@ +%%
+%% %CopyrightBegin%
+%% +%% Copyright Ericsson AB 2006-2009. All Rights Reserved. +%% +%% The contents of this file are subject to the Erlang Public License, +%% Version 1.1, (the "License"); you may not use this file except in +%% compliance with the License. You should have received a copy of the +%% Erlang Public License along with this software. If not, it can be +%% retrieved online at http://www.erlang.org/. +%% +%% Software distributed under the License is distributed on an "AS IS" +%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See +%% the License for the specific language governing rights and limitations +%% under the License. +%% +%% %CopyrightEnd%
+%%
+-module(pg_async).
+
+-define(DRV_CONNECT, $C).
+-define(DRV_DISCONNECT, $D).
+-define(DRV_SELECT, $S).
+
+-export([connect/1, disconnect/1, select/2]).
+
+connect(ConnectStr) ->
+ case erl_ddll:load_driver(".", "pg_async") of
+ ok -> ok;
+ {error, already_loaded} -> ok;
+ E -> exit(E)
+ end,
+ Port = open_port({spawn, ?MODULE}, [binary]),
+ port_control(Port, ?DRV_CONNECT, ConnectStr),
+ case return_port_data(Port) of
+ ok ->
+ {ok, Port};
+ Error ->
+ Error
+ end.
+
+disconnect(Port) ->
+ port_control(Port, ?DRV_DISCONNECT, ""),
+ R = return_port_data(Port),
+ port_close(Port),
+ R.
+
+select(Port, Query) ->
+ port_control(Port, ?DRV_SELECT, Query),
+ return_port_data(Port).
+
+return_port_data(Port) ->
+ receive
+ {Port, {data, Data}} ->
+ binary_to_term(Data)
+ end.
+
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