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Iterator.php
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Iterator.php
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<?php
// +----------------------------------------------------------------------+
// | PHP version 5 |
// +----------------------------------------------------------------------+
// | Copyright (c) 1998-2004 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> |
// +----------------------------------------------------------------------+
//
// $Id$
/**
* @package MDB2
* @category Database
* @author Lukas Smith <smith@pooteeweet.org>
*/
class MDB2_Iterator implements Iterator
{
protected $fetchmode;
protected $result;
protected $row;
// {{{ constructor
/**
* Constructor
*/
public function __construct($result, $fetchmode = MDB2_FETCHMODE_DEFAULT)
{
$this->result = $result;
$this->fetchmode = $fetchmode;
}
// }}}
// {{{ seek()
/**
* seek forward to a specific row in a result set
*
* @param int $rownum number of the row where the data can be found
* @return void
* @access public
*/
public function seek($rownum)
{
$this->row = null;
if ($this->result) {
$this->result->seek($rownum);
}
}
// }}}
// {{{ next()
/**
* Fetch next row of data
*
* @return void
* @access public
*/
public function next()
{
$this->row = null;
}
// }}}
// {{{ current()
/**
* return a row of data
*
* @return void
* @access public
*/
public function current()
{
if (is_null($this->row)) {
$row = $this->result->fetchRow($this->fetchmode);
if (PEAR::isError($row)) {
$row = false;
}
$this->row = $row;
}
return $this->row;
}
// }}}
// {{{ valid()
/**
* check if the end of the result set has been reached
*
* @return mixed true or false on sucess, a MDB2 error on failure
* @access public
*/
public function valid()
{
return (bool)$this->current();
}
// }}}
// {{{ free()
/**
* Free the internal resources associated with result.
*
* @return boolean true on success, false if result is invalid
* @access public
*/
public function free()
{
if ($this->result) {
return $this->result->free();
}
$this->result = null;
$this->row = null;
return false;
}
// }}}
// {{{ key()
/**
* nothing, but Iterator wants to implement this.
*
* @return void
* @access public
*/
public function key()
{
if ($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()
{
$this->free();
}
}
class MDB2_BufferedIterator extends MDB2_Iterator implements SeekableIterator
{
// }}}
// {{{ valid()
/**
* check if the end of the result set has been reached
*
* @return mixed true or false on sucess, a MDB2 error on failure
* @access public
*/
public function valid()
{
if ($this->result) {
return $this->result->valid();
}
return false;
}
// }}}
// {{{count()
/**
* returns the number of rows in a result object
*
* @return mixed MDB2 Error Object or the number of rows
* @access public
*/
public function count()
{
if ($this->result) {
return $this->result->numRows();
}
return false;
}
// }}}
// {{{ hasPrev()
/**
* check if there is a previous row
*
* @return mixed true or false on sucess, a MDB2 error on failure
* @access public
*/
public function hasPrev()
{
if ($this->result) {
return $this->result->rowCount() > 0;
}
return false;
}
// }}}
// {{{ rewind()
/**
* seek to the first row in a result set
*
* @return mixed MDB2_OK on success, a MDB2 error on failure
* @access public
*/
public function rewind()
{
$this->seek(0);
}
// }}}
// {{{ prev()
/**
* move internal row point to the previous row
* Fetch and return a row of data
*
* @return void
* @access public
*/
public function prev()
{
if ($this->hasPrev()) {
$this->seek($this->result->rowCount() - 1);
} else {
return false;
}
return $this->next();
}
}
?>

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