\ncustom_variable_classes = \'public\'\n

\ndrop function var_set (text,text) cascade;\ndrop function var_get (text) cascade;\n\ncreate function var_set (text,text) returns text\nas\n\'\n  select set_config (\'\'public.\'\'||$2, $1, false);\n\' language \'sql\';\n\ncreate function var_get (text) returns text\nas\n\'\n  select current_setting(\'\'public.\'\'||$1);\n\' language \'sql\';\n\ncreate operator >>> (procedure = var_set, leftarg = text, rightarg = text);\ncreate operator <<< (procedure = var_get, rightarg = text);\n

\ntest=# select now() >>> \'script start\';\n           ?column?           \n------------------------------\n  2007 - 01 - 17   10 : 16 : 46 . 29551 + 05 \n( 1  запись)\n\ntest=# select <<< \'script start\';\n           ?column?           \n------------------------------\n  2007 - 01 - 17   10 : 16 : 46 . 29551 + 05 \n( 1  запись)\n

drop function var_set (text,text) cascade;
drop function var_get (text) cascade;

create function var_set (text,text) returns text
as
'
  select set_config (''public.''||$2||pg_backend_pid(), $1, false);
' LANGUAGE 'sql';

create function var_get (text) returns text
as
'
  select current_setting(''public.''||$1||pg_backend_pid());
' LANGUAGE 'sql';

create operator >>> (procedure = var_set, leftarg = text, rightarg = text);
create operator <<< (procedure = var_get, rightarg = text);