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Iterator.php
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<?php // +----------------------------------------------------------------------+ // | PHP version 5 | // +----------------------------------------------------------------------+ // | Copyright (c) 1998-2006 Manuel Lemos, Tomas V.V.Cox, | // | Stig. S. Bakken, Lukas Smith | // | All rights reserved. | // +----------------------------------------------------------------------+ // | MDB2 is a merge of PEAR DB and Metabases that provides a unified DB | // | API as well as database abstraction for PHP applications. | // | This LICENSE is in the BSD license style. | // | | // | Redistribution and use in source and binary forms, with or without | // | modification, are permitted provided that the following conditions | // | are met: | // | | // | Redistributions of source code must retain the above copyright | // | notice, this list of conditions and the following disclaimer. | // | | // | Redistributions in binary form must reproduce the above copyright | // | notice, this list of conditions and the following disclaimer in the | // | documentation and/or other materials provided with the distribution. | // | | // | Neither the name of Manuel Lemos, Tomas V.V.Cox, Stig. S. Bakken, | // | Lukas Smith nor the names of his contributors may be used to endorse | // | or promote products derived from this software without specific prior| // | written permission. | // | | // | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | // | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | // | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS | // | FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE | // | REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, | // | INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, | // | BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS| // | OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED | // | AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | // | LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY| // | WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | // | POSSIBILITY OF SUCH DAMAGE. | // +----------------------------------------------------------------------+ // | Author: Lukas Smith <smith@pooteeweet.org> | // +----------------------------------------------------------------------+ // // $Id: Iterator.php 327310 2012-08-27 15:16:18Z danielc $ /** * PHP5 Iterator * * @package MDB2 * @category Database * @author Lukas Smith <smith@pooteeweet.org> */ class MDB2_Iterator implements Iterator { protected $fetchmode; /** * @var MDB2_Result_Common */ protected $result; protected $row; // {{{ constructor /** * Constructor */ public function __construct(MDB2_Result_Common $result, $fetchmode = MDB2_FETCHMODE_DEFAULT) { $this->result = $result; $this->fetchmode = $fetchmode; } // }}} // {{{ seek() /** * Seek forward to a specific row in a result set * * @param int number of the row where the data can be found * * @return void * @access public */ public function seek($rownum) { $this->row = null; if ($this->result) { $this->result->seek($rownum); } } // }}} // {{{ next() /** * Fetch next row of data * * @return void * @access public */ public function next() { $this->row = null; } // }}} // {{{ current() /** * return a row of data * * @return void * @access public */ public function current() { if (null === $this->row) { $row = $this->result->fetchRow($this->fetchmode); if (MDB2::isError($row)) { $row = false; } $this->row = $row; } return $this->row; } // }}} // {{{ valid() /** * Check if the end of the result set has been reached * * @return bool true/false, false is also returned on failure * @access public */ public function valid() { return (bool)$this->current(); } // }}} // {{{ free() /** * Free the internal resources associated with result. * * @return bool|MDB2_Error true on success, false|MDB2_Error if result is invalid * @access public */ public function free() { if ($this->result) { return $this->result->free(); } $this->result = false; $this->row = null; return false; } // }}} // {{{ key() /** * Returns the row number * * @return int|bool|MDB2_Error true on success, false|MDB2_Error if result is invalid * @access public */ public function key() { if ($this->result) { return $this->result->rowCount(); } return false; } // }}} // {{{ rewind() /** * Seek to the first row in a result set * * @return void * @access public */ public function rewind() { } // }}} // {{{ destructor /** * Destructor */ public function __destruct() { $this->free(); } // }}} } /** * PHP5 buffered Iterator * * @package MDB2 * @category Database * @author Lukas Smith <smith@pooteeweet.org> */ class MDB2_BufferedIterator extends MDB2_Iterator implements SeekableIterator { // {{{ valid() /** * Check if the end of the result set has been reached * * @return bool|MDB2_Error true on success, false|MDB2_Error if result is invalid * @access public */ public function valid() { if ($this->result) { return $this->result->valid(); } return false; } // }}} // {{{count() /** * Returns the number of rows in a result object * * @return int|MDB2_Error number of rows, false|MDB2_Error if result is invalid * @access public */ public function count() { if ($this->result) { return $this->result->numRows(); } return false; } // }}} // {{{ rewind() /** * Seek to the first row in a result set * * @return void * @access public */ public function rewind() { $this->seek(0); } // }}} } ?>