<?php
class db_mysql
{
	var $connid;
	var $dbname;
	var $querynum = 0;
	var $debug = 1;
	var $search = array('/union/i', '/load_file(\s*(\/\*.*\*\/)?\s*)+\(/i', '/into(\s*(\/\*.*\*\/)?\s*)+outfile/i');
	var $replace = array('union &nbsp;', 'load_file &nbsp; (', 'into &nbsp; outfile');
	private $db_enkey = "b9fc66957a4e5dbb";

	function connect($dbhost, $dbuser, $dbpw, $dbname = '', $pconnect = 0, $charset = '')
	{
		$func = $pconnect == 1 ? 'mysql_pconnect' : 'mysql_connect';
		if(!$this->connid = @$func($dbhost, $dbuser, $dbpw))
		{
			if(DB_NAME == '' && file_exists(PHPCMS_ROOT.'install.php'))
			{
				header('location:./install.php');
				exit;
			}
			$this->halt('Can not connect to MySQL server');
			return false;
		}
		if($this->version() > '4.1')
		{
			$serverset = $charset ? "character_set_connection='$charset',character_set_results='$charset',character_set_client=binary" : '';
			$serverset .= $this->version() > '5.0.1' ? ((empty($serverset) ? '' : ',')." sql_mode='' ") : '';
			$serverset && mysql_query("SET $serverset", $this->connid);
		}
		if($dbname && !@mysql_select_db($dbname , $this->connid))
		{
			$this->halt('Cannot use database '.$dbname);
			return false;
		}
		$this->dbname = $dbname;
		return $this->connid;
	}
	function link_id()
	{
		return $this->connid;
	}
	function select_db($dbname)
	{
		if(!@mysql_select_db($dbname , $this->connid)) return false;
		$this->dbname = $dbname;
		return true;
    }

	// 根据type类型决定是否缓冲到内存后再将查询的结果集输出
	function query($sql , $type = '')
	{
		$func = $type == 'UNBUFFERED' ? 'mysql_unbuffered_query' : 'mysql_query';
		if(!($query = @$func($sql , $this->connid)) && $type != 'SILENT')
		{
			$this->halt('MySQL Query Error', $sql);
			return false;
		}
		$this->querynum++;
		return $query;
	}

	function select($sql, $keyfield = '')
	{
		$array = array();
		$result = $this->query($sql);
		while($r = $this->fetch_array($result))
		{
			if($keyfield)
			{
				$key = $r[$keyfield];
				$array[$key] = $r;
			}
			else
			{
				$array[] = $r;
			}
		}
		$this->free_result($result);
		return $array;
	}

	function insert($tablename, $array)
	{
		$this->check_fields($tablename, $array);
		return $this->query("INSERT INTO `$tablename`(`".implode('`,`', array_keys($array))."`) VALUES('".implode("','", $array)."')");
	}

	function update($tablename, $array, $where = '')
	{
		$this->check_fields($tablename, $array);
		if($where)
		{
			$sql = '';
			foreach($array as $k=>$v)
			{
				$sql .= ", `$k`='$v'";
			}
			$sql = substr($sql, 1);
			$sql = "UPDATE `$tablename` SET $sql WHERE $where";
		}
		else
		{
			$sql = "REPLACE INTO `$tablename`(`".implode('`,`', array_keys($array))."`) VALUES('".implode("','", $array)."')";
		}
		return $this->query($sql);
	}

	function delete($tablename, $where){
	    if(empty($where)){
	        return false;
        }
	    return $this->query("delete from {$tablename} where {$where}");
    }

	function get_primary($table)
	{
		$result = $this->query("SHOW COLUMNS FROM $table");
		while($r = $this->fetch_array($result))
		{
			if($r['Key'] == 'PRI') break;
		}
		$this->free_result($result);
		return $r['Field'];
	}

	function check_fields($tablename, $array)
	{
		$fields = $this->get_fields($tablename);
		foreach($array AS $k=>$v)
		{
			if(!in_array($k,$fields))
			{
				$this->halt('MySQL Query Error', "Unknown column '$k' in field list");
				return false;
			}
		}
	}

	function get_fields($table)
	{
		$fields = array();
		$result = $this->query("SHOW COLUMNS FROM $table");
		while($r = $this->fetch_array($result))
		{
			$fields[] = $r['Field'];
		}
		$this->free_result($result);
		return $fields;
	}

	function get_one($sql, $type = '', $expires = 3600, $dbname = '')
	{
		$query = $this->query($sql, $type, $expires, $dbname);
		if(!$query) return false;
		$rs = $this->fetch_array($query);
		$this->free_result($query);
		return $rs ;
	}

	function get_all($sql, $type = '', $expires = 3600, $dbname = '')
	{
		$query = $this->query($sql, $type, $expires, $dbname);
		$data = array();
		while($row =  $this->fetch_array($query)) {
			$data[] = $row;
		}
		$this->free_result($query);
		return $data ;
	}

	function get_colume($sql, $type = '', $expires = 3600, $dbname = '')
	{
		$query = $this->query($sql, $type, $expires, $dbname);
		$rs = $this->fetch_array($query);
		$this->free_result($query);
		return reset($rs) ;
	}


  function dbenc($s) {
    if($this->db_enkey) {
      $s = "genc_".$this->aes_encrypt($s, $this->db_enkey);
    }
    return $s;
  }
  function dbdec($s) {
    if($this->db_enkey) {
      if(strpos($s, 'genc_') === 0) $s = substr($s, 5);
      $s = $this->aes_decrypt($s, $this->db_enkey);
    }
    return $s;
  }

  function aes_encrypt($orig_data, $key, $iv = '', $raw = false) {
    $mode = MCRYPT_MODE_CBC;
    if($iv == 'ecb') {
      $iv = str_repeat("0", 16);
      $mode = MCRYPT_MODE_ECB;
    }
    $encrypter = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', $mode, '');

    $blocksize = mcrypt_enc_get_block_size($encrypter);
    $padding = $blocksize - strlen($orig_data) % $blocksize;
    $padding_text = str_repeat(chr($padding), $padding);
    $orig_data .= $padding_text;


    if(!$iv) $iv = substr($key, 0, 16);
    mcrypt_generic_init($encrypter, $key, $iv);
    $ciphertext = mcrypt_generic($encrypter, $orig_data);
    mcrypt_generic_deinit($encrypter);
    mcrypt_module_close($encrypter);
    if(!$raw) $ciphertext =  base64_encode($ciphertext);
    return $ciphertext;
  }

  function aes_decrypt($ciphertext, $key, $iv = '', $raw = false) {
    if($ciphertext == '') return false;
    $mode = MCRYPT_MODE_CBC;
    if($iv == 'ecb') {
      $iv = str_repeat("0", 16);
      $mode = MCRYPT_MODE_ECB;
    }

    $encrypter = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', $mode, '');
    if(!$raw) $ciphertext = base64_decode($ciphertext);

    if(!$iv) $iv = substr($key, 0, 16);
    mcrypt_generic_init($encrypter, $key, $iv);
    $orig_data = mdecrypt_generic($encrypter, $ciphertext);
    mcrypt_generic_deinit($encrypter);
    mcrypt_module_close($encrypter);
    $length = strlen($orig_data);
    $unpadding = ord($orig_data[$length - 1]);
    return substr($orig_data, 0, $length - $unpadding);
  }

	function fetch_array($query, $result_type = MYSQL_ASSOC)
	{
		$row = @mysql_fetch_array($query, $result_type);
		if(!$row) return $row;
		foreach($row as $k => $v) {
			if(strpos($v, 'genc_') === 0) {
				$row[$k] = $this->dbdec($v);
			}
		}
		return $row;
	}

	function affected_rows()
	{
		return mysql_affected_rows($this->connid);
	}

	function num_rows($query)
	{
		return mysql_num_rows($query);
	}

	function num_fields($query)
	{
		return mysql_num_fields($query);
	}

	function result($query, $row)
	{
		return @mysql_result($query, $row);
	}

	function free_result(&$query)
	{
		return @mysql_free_result($query);
	}

	function insert_id()
	{
		return mysql_insert_id($this->connid);
	}

	function fetch_row($query)
	{
		return mysql_fetch_row($query);
	}

	function escape($string)
	{
		if(!is_array($string)) return str_replace(array('\n', '\r'), array(chr(10), chr(13)), mysql_real_escape_string(preg_replace($this->search, $this->replace, $string), $this->connid));
		foreach($string as $key=>$val) $string[$key] = $this->escape($val);
		return $string;
	}

	function table_status($table)
	{
		return $this->get_one("SHOW TABLE STATUS LIKE '$table'");
	}

	function tables()
	{
		$tables = array();
		$result = $this->query("SHOW TABLES");
		while($r = $this->fetch_array($result))
		{
			$tables[] = $r['Tables_in_'.$this->dbname];
		}
		$this->free_result($result);
		return $tables;
	}

	function table_exists($table)
	{
		$tables = $this->tables($table);
		return in_array($table, $tables);
	}

	function field_exists($table, $field)
	{
		$fields = $this->get_fields($table);
		return in_array($field, $fields);
	}

	function version()
	{
		return mysql_get_server_info($this->connid);
	}

	function close()
	{
		return mysql_close($this->connid);
	}

	function error()
	{
		return @mysql_error($this->connid);
	}

	function errno()
	{
		return intval(@mysql_errno($this->connid)) ;
	}

	function halt($message = '', $sql = '')
	{
		//$this->errormsg = "<b>MySQL Query : </b>$sql <br /><b> MySQL Error : </b>".$this->error()." <br /> <b>MySQL Errno : </b>".$this->errno()." <br /><b> Message : </b> $message";
		//if($this->debug)
		//{
			//$msg = (defined('IN_ADMIN') || DEBUG) ? $this->errormsg : "Bad Request. $LANG[illegal_request_return]";
			//echo '<div style="font-size:12px;text-align:left; border:1px solid #9cc9e0; padding:1px 4px;color:#000000;font-family:Arial, Helvetica,sans-serif;"><span>'.$msg.'</span></div>';
		//	exit;
		//}
	}
}