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PHP:pg_parameter_status()的用法_PostgreSQL函数
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(PHP 5)
pg_parameter_status — Looks up a current parameter setting of the server.
说明 string pg_parameter_status ([ resource $connection ], string $param_name )Looks up a current parameter setting of the server.
Certain parameter values are reported by the server automatically at connection startup or whenever their values change. pg_parameter_status() can be used to interrogate these settings. It returns the current value of a parameter if known, or FALSE if the parameter is not known.
Parameters reported as of PostgreSQL 8.0 include server_version, server_encoding, client_encoding, is_superuser, session_authorization, DateStyle, TimeZone, and integer_datetimes. (server_encoding, TimeZone, and integer_datetimes were not reported by releases before 8.0.) Note that server_version, server_encoding and integer_datetimes cannot change after PostgreSQL startup.
PostgreSQL 7.3 or lower servers do not report parameter settings, pg_parameter_status() includes logic to obtain values for server_version and client_encoding anyway. Applications are encouraged to use pg_parameter_status() rather than ad hoc code to determine these values.
Caution
On a pre-7.4 PostgreSQL server, changing client_encoding via SET after connection startup will not be reflected by pg_parameter_status().
参数connection
PostgreSQL database connection resource. When connection is not present, the default connection is used. The default connection is the last connection made by pg_connect() or pg_pconnect().
param_namePossible param_name values include server_version, server_encoding, client_encoding, is_superuser, session_authorization, DateStyle, TimeZone, and integer_datetimes.
返回值A string containing the value of the parameter, FALSE on failure or invalid param_name.
范例
Example #1 pg_parameter_status() example
<?php$dbconn=pg_connect("dbname=publisher")ordie("Couldnotconnect");echo"Serverencoding:",pg_parameter_status($dbconn,"server_encoding");?>以上例程会输出：
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PHP:pg_num_rows()的用法_PostgreSQL函数 pg_num_rows(PHP4=4.2.0,PHP5)pg_num_rows返回行的数目说明intpg_num_rows(resource$result)pg_num_rows()返回PostgreSQLresult中的行的数目。result参数是由pg_query()函数返回的查询
PHP:pg_num_fields()的用法_PostgreSQL函数 pg_num_fields(PHP4=4.2.0,PHP5)pg_num_fields返回字段的数目说明intpg_num_fields(resource$result)pg_num_fields()返回PostgreSQLresult中的字段（列）数目。参数是由pg_query()函数
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