PHP 5.4.31 Released

pg_connection_status

(PHP 4 >= 4.2.0, PHP 5)

pg_connection_status 获得连接状态

说明

int pg_connection_status ( resource $connection )

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()

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User Contributed Notes 3 notes

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0
Mathieu De Zutter
7 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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0
david dot tulloh at infaze dot com dot au
9 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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0
zytox at hotmail dot com
9 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.
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