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<?php
/**
* Class to represent a database connection
*
* $Id: Connection.php,v 1.9.2.1 2005/06/02 11:33:48 chriskl Exp $
*/
include_once('./classes/database/ADODB_base.php');
class Connection {
var $conn;
// The backend platform. Set to UNKNOWN by default.
var $platform = 'UNKNOWN';
/**
* Creates a new connection. Will actually make a database connection.
* @param $fetchMode Defaults to associative. Override for different behaviour
*/
function Connection($host, $port, $user, $password, $database, $fetchMode = ADODB_FETCH_ASSOC) {
$this->conn = &ADONewConnection('postgres7');
$this->conn->setFetchMode($fetchMode);
// Ignore host if null
if ($host === null || $host == '')
if ($port !== null && $port != '')
$pghost = ':'.$port;
else
$pghost = '';
else
$pghost = "{$host}:{$port}";
$this->conn->connect($pghost, $user, $password, $database);
}
/**
* Gets the name of the correct database driver to use. As a side effect,
* sets the platform.
* @param (return-by-ref) $description A description of the database and version
* @return The class name of the driver eg. Postgres73
* @return null if version is < 7.0
* @return -3 Database-specific failure
*/
function getDriver(&$description) {
// If we're on a recent enough PHP 5, and against PostgreSQL 7.4 or
// higher, we don't need to query for the version. This gives a great
// speed up.
if (function_exists('pg_version')) {
$v = pg_version($this->conn->_connectionID);
if (isset($v['server'])) $version = $v['server'];
}
// If we didn't manage to get the version without a query, query...
if (!isset($version)) {
$adodb = new ADODB_base($this->conn);
$sql = "SELECT VERSION() AS version";
$field = $adodb->selectField($sql, 'version');
// Check the platform, if it's mingw, set it
if (eregi(' mingw ', $field))
$this->platform = 'MINGW';
$params = explode(' ', $field);
if (!isset($params[1])) return -3;
$version = $params[1]; // eg. 7.3.2
}
$description = "PostgreSQL {$version}";
// Detect version and choose appropriate database driver
// If unknown version, then default to latest driver
// All 6.x versions default to oldest driver, even though
// it won't work with those versions.
if ((int)substr($version, 0, 1) < 7)
return null;
elseif (strpos($version, '8.0') === 0 || strpos($version, '7.5') === 0)
return 'Postgres80';
elseif (strpos($version, '7.4') === 0)
return 'Postgres74';
elseif (strpos($version, '7.3') === 0)
return 'Postgres73';
elseif (strpos($version, '7.2') === 0)
return 'Postgres72';
elseif (strpos($version, '7.1') === 0)
return 'Postgres71';
elseif (strpos($version, '7.0') === 0)
return 'Postgres';
else
return 'Postgres81';
}
/**
* Get the last error in the connection
* @return Error string
*/
function getLastError() {
if (function_exists('pg_errormessage'))
return pg_errormessage($this->conn->_connectionID);
else
return pg_last_error($this->conn->_connectionID);
}
}
?>
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