pg_connection_status
(PHP 4 >= 4.2.0, PHP 5)
pg_connection_status — Get connection status
Описание
int pg_connection_status
( resource $connection
)
pg_connection_status() returns the status of the specified connection .
Список параметров
- connection
-
PostgreSQL database connection resource.
Возвращаемые значения
PGSQL_CONNECTION_OK or PGSQL_CONNECTION_BAD.
Примеры
Пример #1 pg_connection_status() example
<?php
$dbconn = pg_connect("dbname=publisher") or die("Could not connect");
$stat = pg_connection_status($dbconn);
if ($stat === PGSQL_CONNECTION_OK) {
echo 'Connection status ok';
} else {
echo 'Connection status bad';
}
?>
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Коментарии
If the connection variable is NULL this function returns 0 in PHP 5.0.2. Havent figured out any more erratic values for the connection variable but be careful.I think zytox is incorrect, at least in PHP 5.0.4.
It returns null, but you have to be careful with your comparison operators.
As an example:
<?php
unset($null);
if (pg_connection_status($null)===PGSQL_CONNECTION_OK)
echo 'this is not called';
if (pg_connection_status($null)==PGSQL_CONNECTION_OK)
echo 'this is called because NULL==0 is true';
?>
Being careful with the comparison operators is not enough:
<?php
if (pg_connection_status($link)===PGSQL_CONNECTION_BAD)
reconnect($link);
?>
The reconnect won't be trigged when $link is null.
The manual is just wrong, there are three return values: PGSQL_CONNECTION_OK, PGSQL_CONNECTION_BAD, null
The wiki page doesn't currently reflect that, but if you're passing PGSQL_CONNECT_ASYNC to pg_connect, creating the connection won't block and transitions through extra states expressed by those constants.
PGSQL_CONNECTION_AUTH_OK
PGSQL_CONNECTION_AWAITING_RESPONSE
PGSQL_CONNECTION_MADE
PGSQL_CONNECTION_SETENV
PGSQL_CONNECTION_SSL_STARTUP
PGSQL_CONNECTION_STARTED