«

PHP:pg_pconnect()的用法

时间:2024-3-1 20:38     作者:韩俊     分类: PHP


pg_pconnect

(PHP 4, PHP 5)

pg_pconnect — 打开一个持久的 PostgreSQL 连接

说明

 resource <strong>pg_pconnect</strong>
  ( string <code>$connection_string</code>

[, int $connect_type
] )

pg_pconnect() 打开一个到 PostgreSQL 数据库的持久连接。返回其它 PostgreSQL 函数所需要的连接资源号。

<p>

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.

要打开持久连接功能,php.ini 中的 pgsql.allow_persistent 参数必须为 "On"(也是默认值)。 最大持久连接数目由 php.ini 中的 pgsql.max_persistent 参数定义(默认为 -1 表示没有限制)。所有连接的数目可由 php.ini 中的 pgsql.max_links 参数设置。

<p>
 pg_close() 不能关闭由 <strong>pg_pconnect()</strong> 打开的持久连接。
</p>

参数

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.

返回值

PostgreSQL connection resource on success, FALSE on failure.

范例

Example #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
?>

参见

pg_connect() - 打开一个 PostgreSQL 连接 持久数据库连接

标签: php php教程

热门推荐