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