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PHP:pg_pconnect()的用法_PostgreSQL函数(php-cp)
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(PHP 4, PHP 5)
pg_pconnect — 打开一个持久的 PostgreSQL 连接
说明 resource pg_pconnect ( string $connection_string [, int $connect_type ] )pg_pconnect() 打开一个到 PostgreSQL 数据库的持久连接。返回其它 PostgreSQL 函数所需要的连接资源号。
If a second call is made to pg_pconnect() with the same connection_string as an existing connection, the existing connection will be returned unless you pass PGSQL_CONNECT_FORCE_NEW as connect_type.
要打开持久连接功能，php.ini 中的 pgsql.allow_persistent 参数必须为 "On"（也是默认值）。最大持久连接数目由 php.ini 中的 pgsql.max_persistent参数定义（默认为 -1 表示没有限制）。所有连接的数目可由 php.ini 中的 pgsql.max_links 参数设置。
pg_close() 不能关闭由 pg_pconnect() 打开的持久连接。
参数
connection_string
The connection_string can be empty to use all default parameters, or it can contain one or more parameter settings separated by whitespace. Each parameter setting is in the form keyword = value. Spaces around the equal sign are optional. To write an empty value or a value containing spaces, surround it with single quotes, e.g., keyword = &#;a value&#;. Single quotes and backslashes within the value must be escaped with a backslash, i.e., &#; and .
The currently recognized parameter keywords are: host, hostaddr, port, dbname, user, password, connect_timeout, options, tty (ignored), sslmode, requiressl (deprecated in favor of sslmode), and service. Which of these arguments exist depends on your PostgreSQL version.
connect_typeIf PGSQL_CONNECT_FORCE_NEW is passed, then a new connection is created, even if the connection_string is identical to an existing connection.
返回值PostgreSQL connection resource on success, FALSE on failure.
范例
Example #1 Using pg_pconnect()
<?php$dbconn=pg_pconnect("dbname=mary");//connecttoadatabasenamed"mary"$dbconn2=pg_pconnect("host=localhostport=dbname=mary");//connecttoadatabasenamed"mary"on"localhost"atport""$dbconn3=pg_pconnect("host=sheepport=dbname=maryuser=lambpassword=foo");//connecttoadatabasenamed"mary"onthehost"sheep"withausernameandpassword$conn_string="host=sheepport=dbname=testuser=lambpassword=bar";$dbconn4=pg_pconnect($conn_string);//connecttoadatabasenamed"test"onthehost"sheep"withausernameandpassword?> 参见pg_connect() - 打开一个 PostgreSQL 连接 持久数据库连接
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