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<?php

/* vim: set expandtab tabstop=4 shiftwidth=4 foldmethod=marker: */

// +----------------------------------------------------------------------+

// | PHP Version 4                                                        |

// +----------------------------------------------------------------------+

// | Copyright (c) 1997-2004 The PHP Group                                |

// +----------------------------------------------------------------------+

// | This source file is subject to version 2.02 of the PHP license,      |

// | that is bundled with this package in the file LICENSE, and is        |

// | available at through the world-wide-web at                           |

// | http://www.php.net/license/2_02.txt.                                 |

// | If you did not receive a copy of the PHP license and are unable to   |

// | obtain it through the world-wide-web, please send a note to          |

// | license@php.net so we can mail you a copy immediately.               |

// +----------------------------------------------------------------------+

// | Authors: Stig Bakken <ssb@php.net>                                   |

// |          Tomas V.V.Cox <cox@idecnet.com>                             |

// | Maintainer: Daniel Convissor <danielc@php.net>                       |

// +----------------------------------------------------------------------+

//

// $Id$

//

// Database independent query interface.

require_once 'PEAR.php';

// {{{ constants

// {{{ error codes

/*

 * The method mapErrorCode in each DB_dbtype implementation maps

 * native error codes to one of these.

 *

 * If you add an error code here, make sure you also add a textual

 * version of it in DB::errorMessage().

 */

define('DB_OK',                         1);

define('DB_ERROR',                     -1);

define('DB_ERROR_SYNTAX',              -2);

define('DB_ERROR_CONSTRAINT',          -3);

define('DB_ERROR_NOT_FOUND',           -4);

define('DB_ERROR_ALREADY_EXISTS',      -5);

define('DB_ERROR_UNSUPPORTED',         -6);

define('DB_ERROR_MISMATCH',            -7);

define('DB_ERROR_INVALID',             -8);

define('DB_ERROR_NOT_CAPABLE',         -9);

define('DB_ERROR_TRUNCATED',          -10);

define('DB_ERROR_INVALID_NUMBER',     -11);

define('DB_ERROR_INVALID_DATE',       -12);

define('DB_ERROR_DIVZERO',            -13);

define('DB_ERROR_NODBSELECTED',       -14);

define('DB_ERROR_CANNOT_CREATE',      -15);

define('DB_ERROR_CANNOT_DELETE',      -16);

define('DB_ERROR_CANNOT_DROP',        -17);

define('DB_ERROR_NOSUCHTABLE',        -18);

define('DB_ERROR_NOSUCHFIELD',        -19);

define('DB_ERROR_NEED_MORE_DATA',     -20);

define('DB_ERROR_NOT_LOCKED',         -21);

define('DB_ERROR_VALUE_COUNT_ON_ROW', -22);

define('DB_ERROR_INVALID_DSN',        -23);

define('DB_ERROR_CONNECT_FAILED',     -24);

define('DB_ERROR_EXTENSION_NOT_FOUND',-25);

define('DB_ERROR_ACCESS_VIOLATION',   -26);

define('DB_ERROR_NOSUCHDB',           -27);

define('DB_ERROR_CONSTRAINT_NOT_NULL',-29);

// }}}

// {{{ prepared statement-related

/*

 * These constants are used when storing information about prepared

 * statements (using the "prepare" method in DB_dbtype).

 *

 * The prepare/execute model in DB is mostly borrowed from the ODBC

 * extension, in a query the "?" character means a scalar parameter.

 * There are two extensions though, a "&" character means an opaque

 * parameter.  An opaque parameter is simply a file name, the real

 * data are in that file (useful for putting uploaded files into your

 * database and such). The "!" char means a parameter that must be

 * left as it is.

 * They modify the quote behavoir:

 * DB_PARAM_SCALAR (?) => 'original string quoted'

 * DB_PARAM_OPAQUE (&) => 'string from file quoted'

 * DB_PARAM_MISC   (!) => original string

 */

define('DB_PARAM_SCALAR', 1);

define('DB_PARAM_OPAQUE', 2);

define('DB_PARAM_MISC',   3);

// }}}

// {{{ binary data-related

/*

 * These constants define different ways of returning binary data

 * from queries.  Again, this model has been borrowed from the ODBC

 * extension.

 *

 * DB_BINMODE_PASSTHRU sends the data directly through to the browser

 * when data is fetched from the database.

 * DB_BINMODE_RETURN lets you return data as usual.

 * DB_BINMODE_CONVERT returns data as well, only it is converted to

 * hex format, for example the string "123" would become "313233".

 */

define('DB_BINMODE_PASSTHRU', 1);

define('DB_BINMODE_RETURN',   2);

define('DB_BINMODE_CONVERT',  3);

// }}}

// {{{ fetch modes

/**

 * 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);

/**

 * Column data as object properties

 */

define('DB_FETCHMODE_OBJECT', 3);

/**

 * For multi-dimensional results: normally the first level of arrays

 * is the row number, and the second level indexed by column number or name.

 * DB_FETCHMODE_FLIPPED switches this order, so the first level of arrays

 * is the column name, and the second level the row number.

 */

define('DB_FETCHMODE_FLIPPED', 4);

/* for compatibility */

define('DB_GETMODE_ORDERED', DB_FETCHMODE_ORDERED);

define('DB_GETMODE_ASSOC',   DB_FETCHMODE_ASSOC);

define('DB_GETMODE_FLIPPED', DB_FETCHMODE_FLIPPED);

// }}}

// {{{ tableInfo() && autoPrepare()-related

/**

 * 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);

/*

 * Used by autoPrepare()

 */

define('DB_AUTOQUERY_INSERT', 1);

define('DB_AUTOQUERY_UPDATE', 2);

// }}}

// {{{ portability modes

/**

 * Portability: turn off all portability features.

 * @see DB_common::setOption()

 */

define('DB_PORTABILITY_NONE', 0);

/**

 * Portability: convert names of tables and fields to lower case

 * when using the get*(), fetch*() and tableInfo() methods.

 * @see DB_common::setOption()

 */

define('DB_PORTABILITY_LOWERCASE', 1);

/**

 * Portability: right trim the data output by get*() and fetch*().

 * @see DB_common::setOption()

 */

define('DB_PORTABILITY_RTRIM', 2);

/**

 * Portability: force reporting the number of rows deleted.

 * @see DB_common::setOption()

 */

define('DB_PORTABILITY_DELETE_COUNT', 4);

/**

 * Portability: enable hack that makes numRows() work in Oracle.

 * @see DB_common::setOption()

 */

define('DB_PORTABILITY_NUMROWS', 8);

/**

 * Portability: makes certain error messages in certain drivers compatible

 * with those from other DBMS's.

 *

 * + mysql, mysqli:  change unique/primary key constraints

 *   DB_ERROR_ALREADY_EXISTS -> DB_ERROR_CONSTRAINT

 *

 * + odbc(access):  MS's ODBC driver reports 'no such field' as code

 *   07001, which means 'too few parameters.'  When this option is on

 *   that code gets mapped to DB_ERROR_NOSUCHFIELD.

 *

 * @see DB_common::setOption()

 */

define('DB_PORTABILITY_ERRORS', 16);

/**

 * Portability: convert null values to empty strings in data output by

 * get*() and fetch*().

 * @see DB_common::setOption()

 */

define('DB_PORTABILITY_NULL_TO_EMPTY', 32);

/**

 * Portability: turn on all portability features.

 * @see DB_common::setOption()

 */

define('DB_PORTABILITY_ALL', 63);

// }}}

// }}}

// {{{ class DB

/**

 * 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.

 *

 * The object model of DB is as follows (indentation means inheritance):

 *

 * DB           The main DB class.  This is simply a utility class

 *              with some "static" methods for creating DB objects as

 *              well as common utility functions for other DB classes.

 *

 * DB_common    The base for each DB implementation.  Provides default

 * |            implementations (in OO lingo virtual methods) for

 * |            the actual DB implementations as well as a bunch of

 * |            query utility functions.

 * |

 * +-DB_mysql   The DB implementation for MySQL.  Inherits DB_common.

 *              When calling DB::factory or DB::connect for MySQL

 *              connections, the object returned is an instance of this

 *              class.

 *

 * @package  DB

 * @author   Stig Bakken <ssb@php.net>

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

 * @since    PHP 4.0

 * @version  $Id$

 * @category Database

 */

class DB

{

    // {{{ &factory()

    /**

     * Create a new DB object for the specified database type.

     *

     * Allows creation of a DB_<driver> object from which the object's

     * methods can be utilized without actually connecting to a database.

     *

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

     * @param array  $options associative array of option names and values

     *

     * @return object  a new DB object.  On error, an error object.

     *

     * @see DB_common::setOption()

     * @access public

     */

    function &factory($type, $options = false)

    {

        if (!is_array($options)) {

            $options = array('persistent' => $options);

        }

        if (isset($options['debug']) && $options['debug'] >= 2) {

            // expose php errors with sufficient debug level

            include_once "DB/{$type}.php";

        } else {

            @include_once "DB/{$type}.php";

        }

        $classname = "DB_${type}";

        if (!class_exists($classname)) {

            $tmp = PEAR::raiseError(null, DB_ERROR_NOT_FOUND, null, null,

                                    "Unable to include the DB/{$type}.php file",

                                    'DB_Error', true);

            return $tmp;

        }

        @$obj =& new $classname;

        foreach ($options as $option => $value) {

            $test = $obj->setOption($option, $value);

            if (DB::isError($test)) {

                return $test;

            }

        }

        return $obj;

    }

    // }}}

    // {{{ &connect()

    /**

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

     *

     * Example 1.

     * <code> <?php

     * require_once 'DB.php';

     *

     * $dsn = 'mysql://user:password@host/database'

     * $options = array(

     *     'debug'       => 2,

     *     'portability' => DB_PORTABILITY_ALL,

     * );

     *

     * $dbh =& DB::connect($dsn, $options);

     * if (DB::isError($dbh)) {

     *     die($dbh->getMessage());

     * }

     * ?></code>

     *

     * @param mixed $dsn      string "data source name" or an array in the

     *                        format returned by DB::parseDSN()

     *

     * @param array $options  an associative array of option names and

     *                        their values

     *

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

     *                 error object on error

     *

     * @see DB::parseDSN(), DB_common::setOption(), DB::isError()

     * @access public

     */

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

    {

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

        $type = $dsninfo['phptype'];

        if (!is_array($options)) {

            /*

             * For backwards compatibility.  $options used to be boolean,

             * indicating whether the connection should be persistent.

             */

            $options = array('persistent' => $options);

        }

        if (isset($options['debug']) && $options['debug'] >= 2) {

            // expose php errors with sufficient debug level

            include_once "DB/${type}.php";

        } else {

            @include_once "DB/${type}.php";

        }

        $classname = "DB_${type}";

        if (!class_exists($classname)) {

            $tmp = PEAR::raiseError(null, DB_ERROR_NOT_FOUND, null, null,

                                    "Unable to include the DB/{$type}.php file for `$dsn'",

                                    'DB_Error', true);

            return $tmp;

        }

        @$obj =& new $classname;

        foreach ($options as $option => $value) {

            $test = $obj->setOption($option, $value);

            if (DB::isError($test)) {

                return $test;

            }

        }

        $err = $obj->connect($dsninfo, $obj->getOption('persistent'));

        if (DB::isError($err)) {

            $err->addUserInfo($dsn);

            return $err;

        }

        return $obj;

    }

    // }}}

    // {{{ apiVersion()

    /**

     * Return the DB API version

     *

     * @return int the DB API version number

     *

     * @access public

     */

    function apiVersion()

    {

        return 2;

    }

    // }}}

    // {{{ isError()

    /**

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

     *

     * @param int $value result code

     *

     * @return bool whether $value is an error

     *

     * @access public

     */

    function isError($value)

    {

        return is_a($value, 'DB_Error');

    }

    // }}}

    // {{{ isConnection()

    /**

     * Tell whether a value is a DB connection

     *

     * @param mixed $value value to test

     *

     * @return bool whether $value is a DB connection

     *

     * @access public

     */

    function isConnection($value)

    {

        return (is_object($value) &&

                is_subclass_of($value, 'db_common') &&

                method_exists($value, 'simpleQuery'));

    }

    // }}}

    // {{{ isManip()

    /**

     * Tell whether a query is a data manipulation query (insert,

     * update or delete) or a data definition query (create, drop,

     * alter, grant, revoke).

     *

     * @access public

     *

     * @param string $query the query

     *

     * @return boolean whether $query is a data manipulation query

     */

    function isManip($query)

    {

        $manips = 'INSERT|UPDATE|DELETE|LOAD DATA|'.'REPLACE|CREATE|DROP|'.

                  'ALTER|GRANT|REVOKE|'.'LOCK|UNLOCK';

        if (preg_match('/^\s*"?('.$manips.')\s+/i', $query)) {

            return true;

        }

        return false;

    }

    // }}}

    // {{{ errorMessage()

    /**

     * Return a textual error message for a DB error code

     *

     * @param integer $value error code

     *

     * @return string error message, or false if the error code was

     * not recognized

     */

    function errorMessage($value)

    {

        static $errorMessages;

        if (!isset($errorMessages)) {

            $errorMessages = array(

                DB_ERROR                    => 'unknown error',

                DB_ERROR_ALREADY_EXISTS     => 'already exists',

                DB_ERROR_CANNOT_CREATE      => 'can not create',

                DB_ERROR_CANNOT_DELETE      => 'can not delete',

                DB_ERROR_CANNOT_DROP        => 'can not drop',

                DB_ERROR_CONSTRAINT         => 'constraint violation',

                DB_ERROR_CONSTRAINT_NOT_NULL=> 'null value violates not-null constraint',

                DB_ERROR_DIVZERO            => 'division by zero',

                DB_ERROR_INVALID            => 'invalid',

                DB_ERROR_INVALID_DATE       => 'invalid date or time',

                DB_ERROR_INVALID_NUMBER     => 'invalid number',

                DB_ERROR_MISMATCH           => 'mismatch',

                DB_ERROR_NODBSELECTED       => 'no database selected',

                DB_ERROR_NOSUCHFIELD        => 'no such field',

                DB_ERROR_NOSUCHTABLE        => 'no such table',

                DB_ERROR_NOT_CAPABLE        => 'DB backend not capable',

                DB_ERROR_NOT_FOUND          => 'not found',

                DB_ERROR_NOT_LOCKED         => 'not locked',

                DB_ERROR_SYNTAX             => 'syntax error',

                DB_ERROR_UNSUPPORTED        => 'not supported',

                DB_ERROR_VALUE_COUNT_ON_ROW => 'value count on row',

                DB_ERROR_INVALID_DSN        => 'invalid DSN',

                DB_ERROR_CONNECT_FAILED     => 'connect failed',

                DB_OK                       => 'no error',

                DB_ERROR_NEED_MORE_DATA     => 'insufficient data supplied',

                DB_ERROR_EXTENSION_NOT_FOUND=> 'extension not found',

                DB_ERROR_NOSUCHDB           => 'no such database',

                DB_ERROR_ACCESS_VIOLATION   => 'insufficient permissions',

                DB_ERROR_TRUNCATED          => 'truncated'

            );

        }

        if (DB::isError($value)) {

            $value = $value->getCode();

        }

        return isset($errorMessages[$value]) ? $errorMessages[$value] : $errorMessages[DB_ERROR];

    }

    // }}}

    // {{{ parseDSN()

    /**

     * Parse a data source name.

     *

     * Additional keys can be added by appending a URI query string to the

     * end of the DSN.

     *

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

     * <code>

     *  phptype(dbsyntax)://username:password@protocol+hostspec/database?option=8&another=true

     * </code>

     *

     * Most variations are allowed:

     * <code>

     *  phptype://username:password@protocol+hostspec:110//usr/db_file.db?mode=0644

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

     *  phptype://username:password@hostspec

     *  phptype://username@hostspec

     *  phptype://hostspec/database

     *  phptype://hostspec

     *  phptype(dbsyntax)

     *  phptype

     * </code>

     *

     * @param string $dsn 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

     *

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

     */

    function parseDSN($dsn)

    {

        $parsed = array(

            'phptype'  => false,

            'dbsyntax' => false,

            'username' => false,

            'password' => false,

            'protocol' => false,

            'hostspec' => false,

            'port'     => false,

            'socket'   => false,

            'database' => false,

        );

        if (is_array($dsn)) {

            $dsn = array_merge($parsed, $dsn);

            if (!$dsn['dbsyntax']) {

                $dsn['dbsyntax'] = $dsn['phptype'];

            }

            return $dsn;

        }

        // 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];

            $parsed['dbsyntax'] = !$arr[2] ? $arr[1] : $arr[2];

        } else {

            $parsed['phptype']  = $str;

            $parsed['dbsyntax'] = $str;

        }

        if (!count($dsn)) {

            return $parsed;

        }

        // Get (if found): username and password

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

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

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

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

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

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

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

            } else {

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

            }

        }

        // Find protocol and hostspec

        // $dsn => proto(proto_opts)/database

        if (preg_match('|^([^(]+)\((.*?)\)/?(.*?)$|', $dsn, $match)) {

            $proto       = $match[1];

            $proto_opts  = $match[2] ? $match[2] : false;

            $dsn         = $match[3];

        // $dsn => protocol+hostspec/database (old format)

        } else {

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

                list($proto, $dsn) = explode('+', $dsn, 2);

            }

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

                list($proto_opts, $dsn) = explode('/', $dsn, 2);

            } else {

                $proto_opts = $dsn;

                $dsn = null;

            }

        }

        // process the different protocol options

        $parsed['protocol'] = (!empty($proto)) ? $proto : 'tcp';

        $proto_opts = rawurldecode($proto_opts);

        if ($parsed['protocol'] == 'tcp') {

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

                list($parsed['hostspec'], $parsed['port']) = explode(':', $proto_opts);

            } else {

                $parsed['hostspec'] = $proto_opts;

            }

        } elseif ($parsed['protocol'] == 'unix') {

            $parsed['socket'] = $proto_opts;

        }

        // Get dabase if any

        // $dsn => database

        if ($dsn) {

            // /database

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

                $parsed['database'] = $dsn;

            // /database?param1=value1&param2=value2

            } else {

                $parsed['database'] = substr($dsn, 0, $pos);

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

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

                    $opts = explode('&', $dsn);

                } else { // database?param1=value1

                    $opts = array($dsn);

                }

                foreach ($opts as $opt) {

                    list($key, $value) = explode('=', $opt);

                    if (!isset($parsed[$key])) {

                        // don't allow params overwrite

                        $parsed[$key] = rawurldecode($value);

                    }

                }

            }

        }

        return $parsed;

    }

    // }}}

    // {{{ assertExtension()

    /**

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

     *

     * @access public

     *

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

     *                     .dll suffix)

     *

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

     *                 loaded, false if it could not be loaded

     */

    function assertExtension($name)

    {

        if (!extension_loaded($name)) {

            $dlext = OS_WINDOWS ? '.dll' : '.so';

            $dlprefix = OS_WINDOWS ? 'php_' : '';

            @dl($dlprefix . $name . $dlext);

            return extension_loaded($name);

        }

        return true;

    }

    // }}}

}

// }}}

// {{{ class DB_Error

/**

 * DB_Error implements a class for reporting portable database error

 * messages.

 *

 * @package  DB

 * @author Stig Bakken <ssb@php.net>

 */

class DB_Error extends PEAR_Error

{

    // {{{ constructor

    /**

     * DB_Error constructor.

     *

     * @param mixed   $code   DB error code, or string with error message.

     * @param integer $mode   what "error mode" to operate in

     * @param integer $level  what error level to use for $mode & PEAR_ERROR_TRIGGER

     * @param mixed   $debuginfo  additional debug info, such as the last query

     *

     * @access public

     *

     * @see PEAR_Error

     */

    function DB_Error($code = DB_ERROR, $mode = PEAR_ERROR_RETURN,

              $level = E_USER_NOTICE, $debuginfo = null)

    {

        if (is_int($code)) {

            $this->PEAR_Error('DB Error: ' . DB::errorMessage($code), $code, $mode, $level, $debuginfo);

        } else {

            $this->PEAR_Error("DB Error: $code", DB_ERROR, $mode, $level, $debuginfo);

        }

    }

    // }}}

}

// }}}

// {{{ class DB_result

/**

 * This class implements a wrapper for a DB result set.

 * A new instance of this class will be returned by the DB implementation

 * after processing a query that returns data.

 *

 * @package  DB

 * @author Stig Bakken <ssb@php.net>

 */

class DB_result

{

    // {{{ properties

    var $dbh;

    var $result;

    var $row_counter = null;

    /**

     * for limit queries, the row to start fetching

     * @var integer

     */

    var $limit_from  = null;

    /**

     * for limit queries, the number of rows to fetch

     * @var integer

     */

    var $limit_count = null;

    // }}}

    // {{{ constructor

    /**

     * DB_result constructor.

     * @param resource &$dbh   DB object reference

     * @param resource $result  result resource id

     * @param array    $options assoc array with optional result options

     */

    function DB_result(&$dbh, $result, $options = array())

    {

        $this->dbh = &$dbh;

        $this->result = $result;

        foreach ($options as $key => $value) {

            $this->setOption($key, $value);

        }

        $this->limit_type  = $dbh->features['limit'];

        $this->autofree    = $dbh->options['autofree'];

        $this->fetchmode   = $dbh->fetchmode;

        $this->fetchmode_object_class = $dbh->fetchmode_object_class;

    }

    function setOption($key, $value = null)

    {

        switch ($key) {

            case 'limit_from':

                $this->limit_from = $value; break;

            case 'limit_count':

                $this->limit_count = $value; break;

        }

    }

    // }}}

    // {{{ fetchRow()

    /**

     * Fetch a row of data and return it by reference into an array.

     *

     * The type of array returned can be controlled either by setting this

     * method's <var>$fetchmode</var> parameter or by changing the default

     * fetch mode setFetchMode() before calling this method.

     *

     * There are two options for standardizing the information returned

     * from databases, ensuring their values are consistent when changing

     * DBMS's.  These portability options can be turned on when creating a

     * new DB object or by using setOption().

     *

     *   + <samp>DB_PORTABILITY_LOWERCASE</samp>

     *     convert names of fields to lower case

     *

     *   + <samp>DB_PORTABILITY_RTRIM</samp>

     *     right trim the data

     *

     * @param int $fetchmode  how the resulting array should be indexed

     * @param int $rownum     the row number to fetch

     *

     * @return array  a row of data, null on no more rows or PEAR_Error

     *                object on error

     *

     * @see DB_common::setOption(), DB_common::setFetchMode()

     * @access public

     */

    function &fetchRow($fetchmode = DB_FETCHMODE_DEFAULT, $rownum=null)

    {

        if ($fetchmode === DB_FETCHMODE_DEFAULT) {

            $fetchmode = $this->fetchmode;

        }

        if ($fetchmode === DB_FETCHMODE_OBJECT) {

            $fetchmode = DB_FETCHMODE_ASSOC;

            $object_class = $this->fetchmode_object_class;

        }

        if ($this->limit_from !== null) {

            if ($this->row_counter === null) {

                $this->row_counter = $this->limit_from;

                // Skip rows

                if ($this->limit_type == false) {

                    $i = 0;

                    while ($i++ < $this->limit_from) {

                        $this->dbh->fetchInto($this->result, $arr, $fetchmode);

                    }

                }

            }

            if ($this->row_counter >= (

                    $this->limit_from + $this->limit_count))

            {

                if ($this->autofree) {

                    $this->free();

                }

                $tmp = null;

                return $tmp;

            }

            if ($this->limit_type == 'emulate') {

                $rownum = $this->row_counter;

            }

            $this->row_counter++;

        }

        $res = $this->dbh->fetchInto($this->result, $arr, $fetchmode, $rownum);

        if ($res === DB_OK) {

            if (isset($object_class)) {

                // default mode specified in DB_common::fetchmode_object_class property

                if ($object_class == 'stdClass') {

                    $arr = (object) $arr;

                } else {

                    $arr = &new $object_class($arr);

                }

            }

            return $arr;

        }

        if ($res == null && $this->autofree) {

            $this->free();

        }

        return $res;

    }

    // }}}

    // {{{ fetchInto()

    /**

     * Fetch a row of data into an array which is passed by reference.

     *

     * The type of array returned can be controlled either by setting this

     * method's <var>$fetchmode</var> parameter or by changing the default

     * fetch mode setFetchMode() before calling this method.

     *

     * There are two options for standardizing the information returned

     * from databases, ensuring their values are consistent when changing

     * DBMS's.  These portability options can be turned on when creating a

     * new DB object or by using setOption().

     *

     *   + <samp>DB_PORTABILITY_LOWERCASE</samp>

     *     convert names of fields to lower case

     *

     *   + <samp>DB_PORTABILITY_RTRIM</samp>

     *     right trim the data

     *

     * @param array &$arr       (reference) array where data from the row

     *                          should be placed

     * @param int   $fetchmode  how the resulting array should be indexed

     * @param int   $rownum     the row number to fetch

     *

     * @return mixed  DB_OK on success, null on no more rows or

     *                a DB_Error object on error

     *

     * @see DB_common::setOption(), DB_common::setFetchMode()

     * @access public

     */

    function fetchInto(&$arr, $fetchmode = DB_FETCHMODE_DEFAULT, $rownum=null)

    {

        if ($fetchmode === DB_FETCHMODE_DEFAULT) {

            $fetchmode = $this->fetchmode;

        }

        if ($fetchmode === DB_FETCHMODE_OBJECT) {

            $fetchmode = DB_FETCHMODE_ASSOC;

            $object_class = $this->fetchmode_object_class;

        }

        if ($this->limit_from !== null) {

            if ($this->row_counter === null) {

                $this->row_counter = $this->limit_from;

                // Skip rows

                if ($this->limit_type == false) {

                    $i = 0;

                    while ($i++ < $this->limit_from) {

                        $this->dbh->fetchInto($this->result, $arr, $fetchmode);

                    }

                }

            }

            if ($this->row_counter >= (

                    $this->limit_from + $this->limit_count))

            {

                if ($this->autofree) {

                    $this->free();

                }

                return null;

            }

            if ($this->limit_type == 'emulate') {

                $rownum = $this->row_counter;

            }

            $this->row_counter++;

        }

        $res = $this->dbh->fetchInto($this->result, $arr, $fetchmode, $rownum);

        if ($res === DB_OK) {

            if (isset($object_class)) {

                // default mode specified in DB_common::fetchmode_object_class property

                if ($object_class == 'stdClass') {

                    $arr = (object) $arr;

                } else {

                    $arr = new $object_class($arr);

                }

            }

            return DB_OK;

        }

        if ($res == null && $this->autofree) {

            $this->free();

        }

        return $res;

    }

    // }}}

    // {{{ numCols()

    /**

     * Get the the number of columns in a result set.

     *

     * @return int the number of columns, or a DB error

     *

     * @access public

     */

    function numCols()

    {

        return $this->dbh->numCols($this->result);