pg_connection_status

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

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_OK 和 PGSQL_CONNECTION_BAD。

示例 #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;
?>

示例 #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()。

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User Contributed Notes 4 notes

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Mathieu De Zutter ¶

15 years ago


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

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zytox at hotmail dot com ¶

17 years ago


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.

down

Anonymous ¶

4 years ago


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

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david dot tulloh at infaze dot com dot au ¶

17 years ago


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';
?>

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官方地址：https://www.php.net/manual/en/function.pg-connection-status.php

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pg_connection_status

说明

User Contributed Notes 4 notes