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# pg_pconnect

(PHP 3, PHP 4, PHP 5)

pg_pconnect -- Open a persistent PostgreSQL connection

## Description

resource pg_pconnect ( string connection_string [, int connect_type] )

pg_pconnect() 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() 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 number 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() will not close persistent links generated by pg_pconnect().

## Parameters

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.

connect_type

  If `PGSQL_CONNECT_FORCE_NEW` is passed, then a new connection is created, even if the connection_string is identical to an existing connection.

## Return Values

PostgreSQL connection resource on success, `FALSE` on failure.

## �d��

範例 1. Using pg_pconnect()

`<?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
?>`

## �Ѧ�

pg_connect()
Persistent Database Connections

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