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pg_parameter_status

(PHP 5)

pg_parameter_status -- Looks up a current parameter setting of the server.

说明

string pg_parameter_status ( resource connection, string param_name )

string pg_parameter_status ( string param_name )

Looks up a current parameter setting of the server.

Certain parameter values are reported by the server automatically at connection startup or whenever their values change. pg_parameter_status() can be used to interrogate these settings. It returns the current value of a parameter if known, or FALSE if the parameter is not known.

Parameters reported as of PostgreSQL 8.0 include server_version , server_encoding , client_encoding , is_superuser , session_authorization , DateStyle , TimeZone , and integer_datetimes . ( server_encoding , TimeZone , and integer_datetimes were not reported by releases before 8.0.) Note that server_version , server_encoding and integer_datetimes cannot change after PostgreSQL startup.

PostgreSQL 7.3 or lower servers do not report parameter settings, pg_parameter_status() includes logic to obtain values for server_version and client_encoding anyway. Applications are encouraged to use pg_parameter_status() rather than ad hoc code to determine these values.

注意

On a pre-7.4 PostgreSQL server, changing client_encoding via SET after connection startup will not be reflected by pg_parameter_status() .

参数

connection

PostgreSQL database connection resource. When connection is not present, the default connection is used. The default connection is the last connection made by pg_connect() or pg_pconnect() .

param_name

Possible param_name values include server_version , server_encoding , client_encoding , is_superuser , session_authorization , DateStyle , TimeZone , and integer_datetimes .

返回值

A string containing the value of the parameter, FALSE on failure or invalid param_name .

范例

例子 1. pg_parameter_status() example

<?php
  $dbconn = pg_connect ( "dbname=publisher" ) or die( "Could not connect" );

  echo "Server encoding: " , pg_parameter_status ( $dbconn , "server_encoding" );
?>

上例将输出： 

Server encoding: SQL_ASCII

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pg_options 上一级 pg_pconnect