<?
class T_DB
{
	var $res, $num, $cnt, $row, $debug;
	function T_DB()
	{
		$argc = func_num_args();
		$argv = func_get_args();
		$this->link_id=  $GLOBALS['link_id'];
		$this->debug = false;
	}
	function SQL($sql)
	{
		if (is_resource($this->link_id)) 
		{
			//$this->escape_string($sql);
			$this->res = @mysql_query($sql,$this->link_id);
			if($this->debug == true)
			{
				die(mysql_error());
			} 
			if (is_resource($this->res))
			{
				$this->num = mysql_num_rows($this->res);
				$this->cnt = $this->num;
				$this->row = mysql_fetch_array($this->res);
				return true;
			}
			$this->num = 0;
			$this->cnt = $this->num;
			$this->row = false;
			return $this->res;
		}else{
			return false;
		}
	}
	function SQL2($sql)
	{
		if (is_resource($this->link_id)) 
		{
			//$this->escape_string($sql);
			$this->res2 = @mysql_query($sql,$this->link_id);
			if (is_resource($this->res2)) {				
				$this->num2 = mysql_num_rows($this->res2);
				$this->cnt2 = $this->num2;
				$this->row2 = mysql_fetch_assoc($this->res2);
				return true;
			}
			$this->num2 = 0;
			$this->cnt2 = $this->num2;
			$this->row2 = false;
			return $this->res2;
		}else
			return false;
	}
	function ROW()
	{
		if (($argc = func_num_args()) == 0 || $this->row == false)
			return;
		$argv = func_get_args();
		switch($argc) {
			case 1 : print $this->row[$argv[0]];
				 break;
			default: if ($argv[1] == -1)
					$argv[1] = strlen($this->row[$argv[0]]);
				 if ($argc == 5)
					ob_start();
				 for($i = 0; $i < $argv[1]; $i++) {
					$ch = substr($this->row[$argv[0]], $i, 1);
					print $ch;
					if (ord($ch) >= 0x80) {
						$i++;
						$ch = substr($this->row[$argv[0]], $i, 1);
						print $ch; 
					}
				 }
				 if ($argc == 5) {
					$buffer = ob_get_contents();
					ob_end_clean();
					$buffer = preg_replace($argv[3], $argv[4], $buffer);
					print $buffer;
				 }
				 if ($argc >= 3 && $i < strlen($this->row[$argv[0]]))
					print $argv[2];
				 break;
		}
	}
	function STEP()
	{
		if ($this->num == 0){
			$this->row = false;
		}else {
			$this->num--;
			$this->row = mysql_fetch_array($this->res);
		}
	}
	function STEP2()
	{
		if ($this->num2 == 0)
			$this->row2 = false;
		else {
			$this->num2--;
			$this->row2 = mysql_fetch_assoc($this->res2);
		}
	}
	function ID()
	{
		if (is_resource($this->link_id)) 
		{
			return mysql_insert_id();
		}
		return 0;
	}

}


function BTAG()
{
	$argv = func_get_args();
	switch($argc)
	{
		case 1 : $GLOBALS['tt_db']= new T_DB($argv[0]);
			 break;
		default: $GLOBALS['tt_db'] = new T_DB();
			 break;
	}
}

function SQL($sql)
{
	return $GLOBALS['tt_db']->SQL($sql);
}
function SQL2($sql)
{
	return $GLOBALS['tt_db']->SQL2($sql);
}
function ROW($i)
{
	return $GLOBALS['tt_db']->row == false ? false : $GLOBALS['tt_db']->row[$i];
}
function STEP()
{
	$GLOBALS['tt_db']->STEP();
}
function STEP2()
{
	$GLOBALS['tt_db']->STEP2();
}
function CNT()//取得结果集中行的数目
{
	return $GLOBALS['tt_db']->cnt;
}
function CNT2()//取得结果集中行的数目
{
	return $GLOBALS['tt_db']->cnt2;
}

function TOP()
{
	return $GLOBALS['tt_db']->row;
}
function TOP2()
{
	return $GLOBALS['tt_db']->row2;
}
function ID()//取得上一步 INSERT 操作产生的 ID 
{
	return $GLOBALS['tt_db']->ID();
}

function tt_enc($s)				//加密
{       
	return str_replace("+","_",base64_encode(substr(bzcompress(rand(10, 99) . $s), 10)));
}

function tt_dec($s)				//解密
{       
	return substr(bzdecompress('BZh41AY&SY' . base64_decode(str_replace("_","+",$s))), 2);
}


?>