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Improving Performance Through Persistent Connections

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LEARN ABOUT PHP

pg_pconnect

PG_PCONNECT(3)															    PG_PCONNECT(3)

pg_pconnect - Open a persistent PostgreSQL connection

SYNOPSIS

       resource pg_pconnect (string  $connection_string, [int  $connect_type])

DESCRIPTION

       pg_pconnect(3) opens a connection to a PostgreSQL database. It returns a connection resource that is needed by other PostgreSQL functions.

	If  a  second  call  is made to pg_pconnect(3) with the same $connection_string as an existing connection, the existing connection will be
       returned unless you pass PGSQL_CONNECT_FORCE_NEW as $connect_type.

	To enable persistent connection, the pgsql.allow_persistent php.ini directive must be set to "On" (which is the default). The maximum num-
       ber of persistent connection can be defined with the pgsql.max_persistent php.ini directive (defaults to -1 for no limit). The total number
       of connections can be set with the pgsql.max_links php.ini directive.

       pg_close(3) will not close persistent links generated by pg_pconnect(3).

PARAMETERS

	      o $connection_string
		- The $connection_string can be empty to use all default parameters, or it can contain one or more parameter settings separated by
		whitespace.  Each  parameter  setting is in the form keyword = value. Spaces around the equal sign are optional. To write an empty
		value or a value containing spaces, surround it with single quotes, e.g., keyword =  'a  value'.  Single  quotes  and  backslashes
		within	the  value  must  be  escaped  with a backslash, i.e., ' and \.  The currently recognized parameter keywords are: $host,
		$hostaddr, $port, $dbname, $user, $password, $connect_timeout, $options, $tty  (ignored),  $sslmode,  $requiressl  (deprecated	in
		favor of $sslmode), and $service. Which of these arguments exist depends on your PostgreSQL version.

	      o $connect_type
		- If PGSQL_CONNECT_FORCE_NEW is passed, then a new connection is created, even if the $connection_string is identical to an exist-
		ing connection.

RETURN VALUES

	PostgreSQL connection resource on success, FALSE on failure.

EXAMPLES

       Example #1

	      Using pg_pconnect(3)

	      <?php
	      $dbconn = pg_pconnect("dbname=mary");
	      //connect to a database named "mary"

	      $dbconn2 = pg_pconnect("host=localhost port=5432 dbname=mary");
	      // connect to a database named "mary" on "localhost" at port "5432"

	      $dbconn3 = pg_pconnect("host=sheep port=5432 dbname=mary user=lamb password=foo");
	      //connect to a database named "mary" on the host "sheep" with a username and password

	      $conn_string = "host=sheep port=5432 dbname=test user=lamb password=bar";
	      $dbconn4 = pg_pconnect($conn_string);
	      //connect to a database named "test" on the host "sheep" with a username and password
	      ?>

SEE ALSO

       pg_connect(3),  Persistent Database Connections.

PHP Documentation Group 													    PG_PCONNECT(3)