(PHP 4, PHP 5, PHP 7, PHP 8)
pg_pconnect — 打開(kāi)一個(gè)持久的 PostgreSQL 連接
$connection_string, int $connect_type = ?): resourcepg_pconnect() 打開(kāi)一個(gè)到 PostgreSQL 數據庫的持久連接。返回其它 PostgreSQL 函數所需要的連接資源號。
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.
要打開(kāi)持久連接功能，php.ini 中的 pgsql.allow_persistent 參數必須為 "On"（也是默認值）。 最大持久連接數目由 php.ini 中的 pgsql.max_persistent 參數定義（默認為 -1 表示沒(méi)有限制）。所有連接的數目可由 php.ini 中的 pgsql.max_links 參數設置。
pg_close() 不能關(guān)閉由 pg_pconnect() 打開(kāi)的持久連接。
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.
PostgreSQL connection resource on success, false on failure.
示例 #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
?>