(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)

pg_connection_busy Проверяет, занято ли соединение в данный момент.


pg_connection_busy(PgSql\Connection $connection): bool

pg_connection_busy() определяет, занято соединение в данный момент или нет. Соединение занято, когда предыдущий запрос ещё выполняется. Функция pg_get_result() также блокирует соединение на время своего выполнения.

Список параметров


Экземпляр класса PgSql\Connection.

Возвращаемые значения

Возвращает true, если соединение занято, в противном случае false.

Список изменений

Версия Описание
8.1.0 Параметр connection теперь ожидает экземпляр класса PgSql\Connection; раньше параметр ждал ресурс (resource).


Пример #1 Пример использования pg_connection_busy()

= pg_connect("dbname=publisher") or die("Не удалось соединится");
$bs = pg_connection_busy($dbconn);
if (
$bs) {
'Соединение занято';
} else {
'Соединение не занято';

Смотрите также

  • pg_connection_status() - Определяет состояние подключения
  • pg_get_result() - Получение результата асинхронного запроса

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User Contributed Notes 2 notes

levi at alliancesoftware dot com dot au
14 years ago
pg_connection_busy() returning true does not necessarily mean that there are results waiting for pg_get_result(); it also stays true for some time after a query that causes any sort of postgres error. (See
4 years ago
There doesn't seem to be any documented way of using this function here, and I'm sore most people trying this are going to default to using a busy loop if there is nothing else to do while waiting (in which case pg_get_result would be better, since it just blocks until a result is ready) or a sleep loop if trying to cancel the query after a certain time.

The C documentation for libPq reccomends using PQisBusy (the C equivalent of pg_connection_busy) by waiting on a socket instead, which lets you timeout if the state doesn't change after a certain period but immediately react if it changes. If you want to cancel after a timeout, you would have something like this :

class SomeKindOfTimeoutException extends Exception { }

SomeKindOfSQLErrorException extends Exception { }

query_with_timeout($conn, $query, $timeout_seconds) {
assert(pg_get_result($conn) === false); // Ensure that nothing is running

$socket = [pg_socket($conn)];
$null = [];

$dispatch_ok = pg_send_query($conn, $query);

$still_running = pg_connection_busy($conn);

$still_running) {
// "A typical application using these functions will have a main loop that uses select() or poll() to wait for all the conditions that it must respond to."
// "One of the conditions will be input available from the server, which in terms of select() means readable data on the file descriptor identified by PQsocket."
// PQisBusy is mapped to pg_connection_busy
stream_select($socket, $null, $null, $timeout_seconds); // Will wait on that socket until that happens or the timeout is reached
$still_running = pg_connection_busy($conn); // False on timeout, true if complete

// You could keep polling like that, this just breaks and throws immediately on first loop
if ($still_running) {
$cancel_ok = pg_cancel_query($conn);
throw new

$res = pg_get_result($conn);

try {
$error_msg = pg_result_error($res);
if (
$error_msg) throw new SomeKindOfSQLErrorException($error_msg);

} finally {

$conn_string = "host=localhost port=5433 dbname=postgres";
$db = pg_connect($conn_string);

query_with_timeout($db, "SELECT pg_sleep(10)", 3); // Will throw
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