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<?php
/**
* @copyright NetMonsters <team@netmonsters.ru>
* @link http://netmonsters.ru
* @package Majestic
* @subpackage db
* @since 2010-02-19
* @version SVN: $Id$
* @filesource $URL$
*/
abstract class DbStatement
{
/**
* @var DbDriver
*/
protected $driver;
/**
* @var string
*/
protected $sql;
protected $map = null;
protected $params = array();
protected $result;
public function __construct($driver, $sql)
{
$this->driver = $driver;
$this->sql = $sql;
}
/**
* @param mixed $style
* @return array
*/
public function fetchAll($style = Db::FETCH_OBJ)
{
$data = array();
while ($row = $this->fetch($style)) {
$data[] = $row;
}
return $data;
}
/**
* @param string $field
*/
public function fetchField($field)
{
$row = $this->fetch(Db::FETCH_ASSOC);
if (isset($row[$field])) {
return $row[$field];
}
return false;
}
public function bindParam($param, &$value)
{
if ($this->map === null) {
$this->mapPlaceholders();
}
if (count($this->map) > 0) {
if (!is_string($param) && !is_int($param)) {
throw new Exception('Placeholder must be an array or string');
}
if (is_object($value) && ! ($value instanceof DbExpr)) {
throw new Exception('Objects excepts DbExpr not allowed.');
}
if (isset($this->map[$param])) {
$this->params[$param] = &$value;
return true;
}
}
return false;
}
/**
* @param array $params
* @return bool
*/
public function execute($params = null)
{
if (is_array($params)) {
foreach ($params as $param => &$value) {
$this->bindParam($param, $value);
}
}
return $this->driverExecute($this->assemble());
}
protected function mapPlaceholders()
{
$matches = array();
if(preg_match_all('/(\?|:[A-z0-9_]+)/u', $this->sql, $matches, PREG_OFFSET_CAPTURE)) {
$noname = 0;
foreach ($matches[0] as $id=>$match) {
$match[2] = $matches[1][$id][0];
$name = ($match[2][0] === ':') ? ltrim($match[2], ':') : $noname++;
$this->map[$name]['placeholder'] = $match[0];
$this->map[$name]['offset'][] = $match[1];
}
}
}
protected function assemble()
{
if (empty($this->map)) {
return $this->sql;
}
$query = $this->sql;
$placeholders = array();
foreach($this->map as $name => $place) {
$value = $this->driver->quote($this->params[$name]);
foreach ($place['offset'] as $offset) {
$placeholders[$offset] = array('placeholder' => $place['placeholder'], 'value' => $value);
}
}
ksort($placeholders);
$increment = 0;
foreach($placeholders as $current_offset => $placeholder) {
$offset = $current_offset + $increment;
$length = mb_strlen($placeholder['placeholder']);
$query = mb_substr($query, 0, $offset) . $placeholder['value'] . mb_substr($query, $offset + $length);
$increment = (($increment - $length) + mb_strlen($placeholder['value']));
}
return $query;
}
public function __destruct()
{
$this->close();
}
/* Abstract methods */
abstract public function fetch($style = Db::FETCH_OBJ);
abstract public function fetchObject($class = 'stdClass');
abstract public function close();
/**
* @return int
*/
abstract public function affectedRows();
abstract public function numRows();
/**
* @return bool
*/
abstract protected function driverExecute($sql);
}