<?php
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// +----------------------------------------------------------------------+
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// | PHP version 5 |
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// +----------------------------------------------------------------------+
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// | Copyright (c) 1998-2004 Manuel Lemos, Tomas V.V.Cox, |
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// | Stig. S. Bakken, Lukas Smith |
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// | All rights reserved. |
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// +----------------------------------------------------------------------+
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// | MDB2 is a merge of PEAR DB and Metabases that provides a unified DB |
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// | API as well as database abstraction for PHP applications. |
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// | This LICENSE is in the BSD license style. |
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// | |
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// | Redistribution and use in source and binary forms, with or without |
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// | modification, are permitted provided that the following conditions |
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// | are met: |
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// | |
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// | Redistributions of source code must retain the above copyright |
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// | notice, this list of conditions and the following disclaimer. |
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// | |
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// | Redistributions in binary form must reproduce the above copyright |
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// | notice, this list of conditions and the following disclaimer in the |
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// | documentation and/or other materials provided with the distribution. |
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// | |
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// | Neither the name of Manuel Lemos, Tomas V.V.Cox, Stig. S. Bakken, |
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// | Lukas Smith nor the names of his contributors may be used to endorse |
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// | or promote products derived from this software without specific prior|
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// | written permission. |
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// | |
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// | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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// | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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// | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
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// | FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
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// | REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
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// | INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
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// | BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS|
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// | OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
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// | AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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// | LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY|
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// | WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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// | POSSIBILITY OF SUCH DAMAGE. |
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// +----------------------------------------------------------------------+
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// | Author: Lukas Smith <smith@pooteeweet.org> |
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// +----------------------------------------------------------------------+
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//
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// $Id$
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/**
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* @package MDB2
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* @category Database
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* @author Lukas Smith <smith@pooteeweet.org>
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*/
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class MDB2_Iterator implements Iterator
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{
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protected $fetchmode;
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protected $result;
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protected $row;
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// {{{ constructor
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/**
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* Constructor
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*/
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public function __construct($result, $fetchmode = MDB2_FETCHMODE_DEFAULT)
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{
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$this->result = $result;
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$this->fetchmode = $fetchmode;
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}
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// }}}
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// {{{ seek()
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/**
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* seek forward to a specific row in a result set
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*
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* @param int $rownum number of the row where the data can be found
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* @return void
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* @access public
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*/
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public function seek($rownum)
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{
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$this->row = null;
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if ($this->result) {
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$this->result->seek($rownum);
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}
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}
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// }}}
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// {{{ next()
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/**
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* Fetch next row of data
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*
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* @return void
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* @access public
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*/
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public function next()
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{
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$this->row = null;
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}
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// }}}
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// {{{ current()
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/**
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* return a row of data
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*
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* @return void
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* @access public
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*/
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public function current()
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{
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if (is_null($this->row)) {
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$row = $this->result->fetchRow($this->fetchmode);
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if (PEAR::isError($row)) {
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$row = false;
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}
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$this->row = $row;
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}
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return $this->row;
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}
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// }}}
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// {{{ valid()
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/**
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* check if the end of the result set has been reached
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*
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* @return mixed true or false on sucess, a MDB2 error on failure
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* @access public
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*/
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public function valid()
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{
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return (bool)$this->current();
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}
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// }}}
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// {{{ free()
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/**
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* Free the internal resources associated with result.
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*
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* @return boolean true on success, false if result is invalid
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* @access public
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*/
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public function free()
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{
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if ($this->result) {
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return $this->result->free();
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}
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$this->result = null;
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$this->row = null;
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return false;
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}
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// }}}
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// {{{ key()
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/**
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* nothing, but Iterator wants to implement this.
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*
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* @return void
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* @access public
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*/
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public function key()
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{
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if ($this->result) {
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return $this->result->rowCount();
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}
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return false;
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}
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// }}}
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// {{{ rewind()
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/**
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* seek to the first row in a result set
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*
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* @return void
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* @access public
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*/
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public function rewind()
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{
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}
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// }}}
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// {{{ destructor
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/**
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* Destructor
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*/
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public function __destruct()
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{
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$this->free();
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}
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}
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class MDB2_BufferedIterator extends MDB2_Iterator implements SeekableIterator
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{
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// }}}
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// {{{ valid()
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/**
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* check if the end of the result set has been reached
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*
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* @return mixed true or false on sucess, a MDB2 error on failure
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* @access public
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*/
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public function valid()
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{
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if ($this->result) {
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return $this->result->valid();
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}
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return false;
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}
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// }}}
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// {{{count()
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/**
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* returns the number of rows in a result object
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*
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* @return mixed MDB2 Error Object or the number of rows
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* @access public
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*/
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public function count()
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{
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if ($this->result) {
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return $this->result->numRows();
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}
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return false;
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}
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// }}}
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// {{{ hasPrev()
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/**
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* check if there is a previous row
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*
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* @return mixed true or false on sucess, a MDB2 error on failure
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* @access public
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*/
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public function hasPrev()
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{
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if ($this->result) {
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return $this->result->rowCount() > 0;
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}
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return false;
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}
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// }}}
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// {{{ rewind()
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/**
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* seek to the first row in a result set
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*
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* @return mixed MDB2_OK on success, a MDB2 error on failure
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* @access public
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*/
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public function rewind()
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{
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$this->seek(0);
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}
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// }}}
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// {{{ prev()
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/**
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* move internal row point to the previous row
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* Fetch and return a row of data
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*
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* @return void
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* @access public
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*/
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public function prev()
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{
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if ($this->hasPrev()) {
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$this->seek($this->result->rowCount() - 1);
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} else {
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return false;
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}
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return $this->next();
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}
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}
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?>
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