打开一个持久的 PostgreSQL 连接 pg_pconnect

(PHP 4, PHP 5, PHP 7)

pg_pconnect — 打开一个持久的 PostgreSQL 连接

说明

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

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。

If a second call is made topg_pconnect()with the sameconnection_stringas an existing connection, the existing connection will be returned unless you passPGSQL_CONNECT_FORCE_NEWasconnect_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。

pg_close()不能关闭由pg_pconnect()打开的持久连接。

参数

connection_string

Theconnection_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

IfPGSQL_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,FALSEon failure.

范例

Example #1 Usingpg_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
?>

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参见

pg_connect()- 打开一个 PostgreSQL 连接

持久数据库连接