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<?php

/** 

 * @version V4.80 8 Mar 2006 (c) 2000-2006 John Lim (jlim@natsoft.com.my). All rights reserved.

 * Released under both BSD license and Lesser GPL library license. 

 * Whenever there is any discrepancy between the two licenses, 

 * the BSD license will take precedence. 

 *

 * Set tabs to 4 for best viewing.

 * 

 * PEAR DB Emulation Layer for ADODB.

 *

 * The following code is modelled on PEAR DB code by Stig Bakken <ssb@fast.no>								   |

 * and Tomas V.V.Cox <cox@idecnet.com>.	Portions (c)1997-2002 The PHP Group.

 */

 /*

 We support:

 DB_Common

 ---------

 	query - returns PEAR_Error on error

	limitQuery - return PEAR_Error on error

	prepare - does not return PEAR_Error on error

	execute - does not return PEAR_Error on error

	setFetchMode - supports ASSOC and ORDERED

	errorNative

	quote

	nextID

	disconnect

	getOne

	getAssoc

	getRow

	getCol

	getAll

 DB_Result

 ---------

 	numRows - returns -1 if not supported

	numCols

	fetchInto - does not support passing of fetchmode

	fetchRows - does not support passing of fetchmode

	free

 */

define('ADODB_PEAR',dirname(__FILE__));

include_once "PEAR.php";

include_once ADODB_PEAR."/adodb-errorpear.inc.php";

include_once ADODB_PEAR."/adodb.inc.php";

if (!defined('DB_OK')) {

define("DB_OK",	1);

define("DB_ERROR",-1);

// autoExecute constants

define('DB_AUTOQUERY_INSERT', 1);

define('DB_AUTOQUERY_UPDATE', 2);

/**

 * This is a special constant that tells DB the user hasn't specified

 * any particular get mode, so the default should be used.

 */

define('DB_FETCHMODE_DEFAULT', 0);

/**

 * Column data indexed by numbers, ordered from 0 and up

 */

define('DB_FETCHMODE_ORDERED', 1);

/**

 * Column data indexed by column names

 */

define('DB_FETCHMODE_ASSOC', 2);

/* for compatibility */

define('DB_GETMODE_ORDERED', DB_FETCHMODE_ORDERED);

define('DB_GETMODE_ASSOC',   DB_FETCHMODE_ASSOC);

/**

 * these are constants for the tableInfo-function

 * they are bitwised or'ed. so if there are more constants to be defined

 * in the future, adjust DB_TABLEINFO_FULL accordingly

 */

define('DB_TABLEINFO_ORDER', 1);

define('DB_TABLEINFO_ORDERTABLE', 2);

define('DB_TABLEINFO_FULL', 3);

}

/**

 * The main "DB" class is simply a container class with some static

 * methods for creating DB objects as well as some utility functions

 * common to all parts of DB.

 *

 */

class DB

{

	/**

	 * Create a new DB object for the specified database type

	 *

	 * @param $type string database type, for example "mysql"

	 *

	 * @return object a newly created DB object, or a DB error code on

	 * error

	 */

	function &factory($type)

	{

		include_once(ADODB_DIR."/drivers/adodb-$type.inc.php");

		$obj = &NewADOConnection($type);

		if (!is_object($obj)) $obj =& new PEAR_Error('Unknown Database Driver: '.$dsninfo['phptype'],-1);

		return $obj;

	}

	/**

	 * Create a new DB object and connect to the specified database

	 *

	 * @param $dsn mixed "data source name", see the DB::parseDSN

	 * method for a description of the dsn format.  Can also be

	 * specified as an array of the format returned by DB::parseDSN.

	 *

	 * @param $options mixed if boolean (or scalar), tells whether

	 * this connection should be persistent (for backends that support

	 * this).  This parameter can also be an array of options, see

	 * DB_common::setOption for more information on connection

	 * options.

	 *

	 * @return object a newly created DB connection object, or a DB

	 * error object on error

	 *

	 * @see DB::parseDSN

	 * @see DB::isError

	 */

	function &connect($dsn, $options = false)

	{

		if (is_array($dsn)) {

			$dsninfo = $dsn;

		} else {

			$dsninfo = DB::parseDSN($dsn);

		}

		switch ($dsninfo["phptype"]) {

			case 'pgsql': 	$type = 'postgres7'; break;

			case 'ifx':		$type = 'informix9'; break;

			default: 		$type = $dsninfo["phptype"]; break;

		}

		if (is_array($options) && isset($options["debug"]) &&

			$options["debug"] >= 2) {

			// expose php errors with sufficient debug level

			 @include_once("adodb-$type.inc.php");

		} else {

			 @include_once("adodb-$type.inc.php");

		}

		@$obj =& NewADOConnection($type);

		if (!is_object($obj)) {

			$obj =& new PEAR_Error('Unknown Database Driver: '.$dsninfo['phptype'],-1);

			return $obj;

		}

		if (is_array($options)) {

			foreach($options as $k => $v) {

				switch(strtolower($k)) {

				case 'persist':

				case 'persistent': 	$persist = $v; break;

				#ibase

				case 'dialect': 	$obj->dialect = $v; break;

				case 'charset':		$obj->charset = $v; break;

				case 'buffers':		$obj->buffers = $v; break;

				#ado

				case 'charpage':	$obj->charPage = $v; break;

				#mysql

				case 'clientflags': $obj->clientFlags = $v; break;

				}

			}

		} else {

		   	$persist = false;

		}

		if (isset($dsninfo['socket'])) $dsninfo['hostspec'] .= ':'.$dsninfo['socket'];

		else if (isset($dsninfo['port'])) $dsninfo['hostspec'] .= ':'.$dsninfo['port'];

		if($persist) $ok = $obj->PConnect($dsninfo['hostspec'], $dsninfo['username'],$dsninfo['password'],$dsninfo['database']);

		else  $ok = $obj->Connect($dsninfo['hostspec'], $dsninfo['username'],$dsninfo['password'],$dsninfo['database']);

		if (!$ok) $obj = ADODB_PEAR_Error();

		return $obj;

	}

	/**

	 * Return the DB API version

	 *

	 * @return int the DB API version number

	 */

	function apiVersion()

	{

		return 2;

	}

	/**

	 * Tell whether a result code from a DB method is an error

	 *

	 * @param $value int result code

	 *

	 * @return bool whether $value is an error

	 */

	function isError($value)

	{

		if (!is_object($value)) return false;

		$class = get_class($value);

		return $class == 'pear_error' || is_subclass_of($value, 'pear_error') || 

				$class == 'db_error' || is_subclass_of($value, 'db_error');

	}

	/**

	 * Tell whether a result code from a DB method is a warning.

	 * Warnings differ from errors in that they are generated by DB,

	 * and are not fatal.

	 *

	 * @param $value mixed result value

	 *

	 * @return bool whether $value is a warning

	 */

	function isWarning($value)

	{

		return false;

		/*

		return is_object($value) &&

			(get_class( $value ) == "db_warning" ||

			 is_subclass_of($value, "db_warning"));*/

	}

	/**

	 * Parse a data source name

	 *

	 * @param $dsn string Data Source Name to be parsed

	 *

	 * @return array an associative array with the following keys:

	 *

	 *  phptype: Database backend used in PHP (mysql, odbc etc.)

	 *  dbsyntax: Database used with regards to SQL syntax etc.

	 *  protocol: Communication protocol to use (tcp, unix etc.)

	 *  hostspec: Host specification (hostname[:port])

	 *  database: Database to use on the DBMS server

	 *  username: User name for login

	 *  password: Password for login

	 *

	 * The format of the supplied DSN is in its fullest form:

	 *

	 *  phptype(dbsyntax)://username:password@protocol+hostspec/database

	 *

	 * Most variations are allowed:

	 *

	 *  phptype://username:password@protocol+hostspec:110//usr/db_file.db

	 *  phptype://username:password@hostspec/database_name

	 *  phptype://username:password@hostspec

	 *  phptype://username@hostspec

	 *  phptype://hostspec/database

	 *  phptype://hostspec

	 *  phptype(dbsyntax)

	 *  phptype

	 *

	 * @author Tomas V.V.Cox <cox@idecnet.com>

	 */

	function parseDSN($dsn)

	{

		if (is_array($dsn)) {

			return $dsn;

		}

		$parsed = array(

			'phptype'  => false,

			'dbsyntax' => false,

			'protocol' => false,

			'hostspec' => false,

			'database' => false,

			'username' => false,

			'password' => false

		);

		// Find phptype and dbsyntax

		if (($pos = strpos($dsn, '://')) !== false) {

			$str = substr($dsn, 0, $pos);

			$dsn = substr($dsn, $pos + 3);

		} else {

			$str = $dsn;

			$dsn = NULL;

		}

		// Get phptype and dbsyntax

		// $str => phptype(dbsyntax)

		if (preg_match('|^(.+?)\((.*?)\)$|', $str, $arr)) {

			$parsed['phptype'] = $arr[1];

			$parsed['dbsyntax'] = (empty($arr[2])) ? $arr[1] : $arr[2];

		} else {

			$parsed['phptype'] = $str;

			$parsed['dbsyntax'] = $str;

		}

		if (empty($dsn)) {

			return $parsed;

		}

		// Get (if found): username and password

		// $dsn => username:password@protocol+hostspec/database

		if (($at = strpos($dsn,'@')) !== false) {

			$str = substr($dsn, 0, $at);

			$dsn = substr($dsn, $at + 1);

			if (($pos = strpos($str, ':')) !== false) {

				$parsed['username'] = urldecode(substr($str, 0, $pos));

				$parsed['password'] = urldecode(substr($str, $pos + 1));

			} else {

				$parsed['username'] = urldecode($str);

			}

		}

		// Find protocol and hostspec

		// $dsn => protocol+hostspec/database

		if (($pos=strpos($dsn, '/')) !== false) {

			$str = substr($dsn, 0, $pos);

			$dsn = substr($dsn, $pos + 1);

		} else {

			$str = $dsn;

			$dsn = NULL;

		}

		// Get protocol + hostspec

		// $str => protocol+hostspec

		if (($pos=strpos($str, '+')) !== false) {

			$parsed['protocol'] = substr($str, 0, $pos);

			$parsed['hostspec'] = urldecode(substr($str, $pos + 1));

		} else {

			$parsed['hostspec'] = urldecode($str);

		}

		// Get dabase if any

		// $dsn => database

		if (!empty($dsn)) {

			$parsed['database'] = $dsn;

		}

		return $parsed;

	}

	/**

	 * Load a PHP database extension if it is not loaded already.

	 *

	 * @access public

	 *

	 * @param $name the base name of the extension (without the .so or

	 * .dll suffix)

	 *

	 * @return bool true if the extension was already or successfully

	 * loaded, false if it could not be loaded

	 */

	function assertExtension($name)

	{

		if (!extension_loaded($name)) {

			$dlext = (strncmp(PHP_OS,'WIN',3) === 0) ? '.dll' : '.so';

			@dl($name . $dlext);

		}

		if (!extension_loaded($name)) {

			return false;

		}

		return true;

	}

}

?>