pg_pconnect
(PHP 4, PHP 5, PHP 7, PHP 8)
pg_pconnect — 打開一個持久的 PostgreSQL 連線
說明
$connection_string, int $connect_type = ?): resourcepg_pconnect() 打開一個到 PostgreSQL 數據庫的持久連線。返回其它 PostgreSQL 函式所需要的連線資源號。
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.
要打開持久連線功能，php.ini 中的 pgsql.allow_persistent 參數必須為 "On"（也是預設值）。 最大持久連線數目由 php.ini 中的 pgsql.max_persistent 參數定義（預設為 -1 表示沒有限制）。所有連線的數目可由 php.ini 中的 pgsql.max_links 參數設定。
pg_close() 不能關閉由 pg_pconnect() 打開的持久連線。
參數
-
connection_string -
The
connection_stringcan 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 formkeyword = 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 ofsslmode), andservice. Which of these arguments exist depends on your PostgreSQL version. -
connect_type -
If
PGSQL_CONNECT_FORCE_NEWis passed, then a new connection is created, even if theconnection_stringis identical to an existing connection.
返回值
PostgreSQL connection resource on success, false on failure.
範例
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
?>