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182 lines
4.8 KiB
182 lines
4.8 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 103 2008-04-09 16:22:43Z magike.net $ |
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*/ |
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/** |
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* 数据库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_Mysql implements Typecho_Db_Adapter |
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{ |
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/** |
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* 数据库连接字符串标示 |
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* |
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* @access private |
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* @var resource |
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*/ |
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private $_dbLink; |
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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 function_exists('mysql_connect'); |
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} |
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/** |
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* 数据库连接函数 |
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* |
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* @param Typecho_Config $config 数据库配置 |
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* @throws Typecho_Db_Exception |
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* @return resource |
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*/ |
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public function connect(Typecho_Config $config) |
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{ |
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if ($this->_dbLink = @mysql_connect($config->host . (empty($config->port) ? '' : ':' . $config->port), |
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$config->user, $config->password, true)) { |
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if (@mysql_select_db($config->database, $this->_dbLink)) { |
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if ($config->charset) { |
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mysql_query("SET NAMES '{$config->charset}'", $this->_dbLink); |
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} |
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return $this->_dbLink; |
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} |
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} |
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/** 数据库异常 */ |
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throw new Typecho_Db_Adapter_Exception(@mysql_error($this->_dbLink)); |
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} |
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/** |
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* 获取数据库版本 |
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* |
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* @param mixed $handle |
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* @return string |
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*/ |
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public function getVersion($handle) |
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{ |
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return 'ext:mysql ' . mysql_get_server_info($handle); |
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} |
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/** |
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* 执行数据库查询 |
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* |
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* @param string $query 数据库查询SQL字符串 |
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* @param mixed $handle 连接对象 |
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* @param integer $op 数据库读写状态 |
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* @param string $action 数据库动作 |
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* @throws Typecho_Db_Exception |
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* @return resource |
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*/ |
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public function query($query, $handle, $op = Typecho_Db::READ, $action = NULL) |
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{ |
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if ($resource = @mysql_query($query instanceof Typecho_Db_Query ? $query->__toString() : $query, $handle)) { |
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return $resource; |
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} |
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/** 数据库异常 */ |
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throw new Typecho_Db_Query_Exception(@mysql_error($this->_dbLink), mysql_errno($this->_dbLink)); |
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} |
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/** |
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* 将数据查询的其中一行作为数组取出,其中字段名对应数组键值 |
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* |
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* @param resource $resource 查询返回资源标识 |
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* @return array |
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*/ |
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public function fetch($resource) |
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{ |
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return mysql_fetch_assoc($resource); |
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} |
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/** |
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* 将数据查询的其中一行作为对象取出,其中字段名对应对象属性 |
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* |
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* @param resource $resource 查询的资源数据 |
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* @return object |
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*/ |
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public function fetchObject($resource) |
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{ |
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return mysql_fetch_object($resource); |
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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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* 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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* 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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* 取出最后一次查询影响的行数 |
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* |
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* @param resource $resource 查询的资源数据 |
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* @param mixed $handle 连接对象 |
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* @return integer |
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*/ |
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public function affectedRows($resource, $handle) |
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{ |
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return mysql_affected_rows($handle); |
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} |
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/** |
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* 取出最后一次插入返回的主键值 |
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* |
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* @param resource $resource 查询的资源数据 |
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* @param mixed $handle 连接对象 |
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* @return integer |
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*/ |
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public function lastInsertId($resource, $handle) |
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{ |
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return mysql_insert_id($handle); |
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} |
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}
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