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90 lines
2.4 KiB
90 lines
2.4 KiB
<?php |
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if (!defined('__TYPECHO_ROOT_DIR__')) exit; |
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/** |
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* Typecho Blog Platform |
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* |
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* @copyright Copyright (c) 2008 Typecho team (http://www.typecho.org) |
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* @license GNU General Public License 2.0 |
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* @version $Id: Mysql.php 89 2008-03-31 00:10:57Z magike.net $ |
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*/ |
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/** |
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* 数据库Pdo_Mysql适配器 |
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* |
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* @package Db |
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*/ |
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class Typecho_Db_Adapter_Pdo_Mysql extends Typecho_Db_Adapter_Pdo |
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{ |
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/** |
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* 判断适配器是否可用 |
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* |
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* @access public |
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* @return boolean |
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*/ |
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public static function isAvailable() |
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{ |
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return parent::isAvailable() && in_array('mysql', PDO::getAvailableDrivers()); |
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} |
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/** |
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* 初始化数据库 |
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* |
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* @param Typecho_Config $config 数据库配置 |
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* @access public |
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* @return PDO |
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*/ |
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public function init(Typecho_Config $config) |
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{ |
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$pdo = new PDO(!empty($config->dsn) ? $config->dsn : |
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"mysql:dbname={$config->database};host={$config->host};port={$config->port}", $config->user, $config->password); |
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$pdo->setAttribute(PDO::MYSQL_ATTR_USE_BUFFERED_QUERY, true); |
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$pdo->exec("SET NAMES '{$config->charset}'"); |
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return $pdo; |
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} |
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/** |
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* 对象引号过滤 |
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* |
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* @access public |
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* @param string $string |
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* @return string |
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*/ |
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public function quoteColumn($string) |
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{ |
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return '`' . $string . '`'; |
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} |
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/** |
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* 引号转义函数 |
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* |
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* @param string $string 需要转义的字符串 |
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* @return string |
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*/ |
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public function quoteValue($string) |
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{ |
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return '\'' . str_replace(array('\'', '\\'), array('\'\'', '\\\\'), $string) . '\''; |
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} |
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/** |
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* 合成查询语句 |
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* |
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* @access public |
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* @param array $sql 查询对象词法数组 |
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* @return string |
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*/ |
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public function parseSelect(array $sql) |
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{ |
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if (!empty($sql['join'])) { |
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foreach ($sql['join'] as $val) { |
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list($table, $condition, $op) = $val; |
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$sql['table'] = "{$sql['table']} {$op} JOIN {$table} ON {$condition}"; |
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} |
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} |
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$sql['limit'] = (0 == strlen($sql['limit'])) ? NULL : ' LIMIT ' . $sql['limit']; |
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$sql['offset'] = (0 == strlen($sql['offset'])) ? NULL : ' OFFSET ' . $sql['offset']; |
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return 'SELECT ' . $sql['fields'] . ' FROM ' . $sql['table'] . |
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$sql['where'] . $sql['group'] . $sql['having'] . $sql['order'] . $sql['limit'] . $sql['offset']; |
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} |
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}
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