php教程

pg_connection_status

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

pg_connection_status 获得连接状态

说明

pg_connection_status ( resource $connection ) : int

pg_connection_status() 返回一个连接的状态。可能的状态为 PGSQL_CONNECTION_OKPGSQL_CONNECTION_BAD

Example #1 pg_connection_status() 例子

<?php
    $dbconn 
pg_connect("dbname=publisher") or die("Could not connect");
    
$stat pg_connection_status($dbconn);
    echo 
'connection_status: '.$stat;
?>

Example #2 pg_connection_status() 例子

<?php
    $dbconn 
pg_connect("dbname=publisher") or die("Could not connect");
    
$stat pg_connection_status($dbconn);
    echo 
'connection_status: '.$stat;
?>

参见 pg_connection_busy()

User Contributed Notes

Anonymous 30-Mar-2018 01:38
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
Mathieu De Zutter 02-Aug-2006 05:45
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
david dot tulloh at infaze dot com dot au 14-Jun-2005 08:33
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';
?>
zytox at hotmail dot com 02-Apr-2005 10:34
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.

CopyRight © 2008-2022 verySource.Com All Rights reserved. 京ICP备17048824号-1 京公网安备:11010502034788