很好用的PHP数据库类

<? 
//很好用的PHP数据库类，三、四句代码搞定一个表的操作，无论这个表字段有多复杂。 
//此类多次大量用在大型网站程序的开发上，效果特别的好。 
//作者：快刀浪子＋＋　 
define(\"_PHP_RECORD_\",\"exists\"); 
class TRecord 
{ 
var $db; 
var $rc; 
var $name; 
var $value; 
var $num; 
var $buffer; //查询结果　调用方法　$buffer[$i][\"fields\"]; 
var $seekstr;
 //保存查询条件用 
function TRecord($host=\"localhost\",$user=\"root\",$passwd=\"\") 
{global $HTTP_POST_VARS; 
$this->num=0; 
$this->host=$host; 
$this->user=$user; 
$this->passwd=$passwd; 
if(($this->db=mysql_connect($host,$user,$passwd))==false) 
exit(\"联结数据库出错!\"); 

while(list($this->name[$this->num],$this->value[$this->num])=each($HTTP_POST_VARS)) 
{$this->num++; 
} 
////////////// 
for($i=0;$i<$this->num;$i++) 
{$this->value[$i]=$this->SafeString($this->value[$i]); 
} 
// 
} 
function SafeString($message) 
{$message=str_replace(\" \",\" \",$message); 
$message=str_replace(\"<\",\"<\",$message); 
$message=str_replace(\">\",\">\",$message); 
//$message=str_replace(\"｜\",\"｜\",$message); 
//$message=str_replace(\"\\"\",\""\",$message); 
//$message=nl2br($message); 
return $message; 
} 
////// 
function reset() 
{$this->num=0; 
$this->name=array(); 

 $this->value=array(); 
} 
function add($name,$values) 
{$this->name[$this->num]=$name; 

 $this->value[$this->num]=$values; 
$this->num++; 
} 
function unadd($name) 
{$j=0; 
for($i=0;$i<$this->num;$i++) 
{if($this->name[$i]!=$name) 
{$aaa[$j]=$this->name[$i]; 
$bbb[$j]=$this->value[$i]; 
$j++; 
} 
} 
$this->name=$aaa; 
$this->value=$bbb; 
$this->num=$j; 
} 
function InsertRecord($database,$table) 
{mysql_select_db($database); 
if($this->num==0) 
exit(\"没有定义变量！\"); 
$field=implode(\",\",$this->name); 
for($i=0;$i<$this->num;$i++) 
{if(is_string($this->value[$i])) 
$ls[$i]=\"\'\".$this->value[$i].\"\'\"; 
　else 
$ls[$i]=$this->value[$i]; 


　$value=implode(\",\",$ls); 　 
} 
$sql=sprintf(\"insert into %s(%s) values(%s)\",$table,$field,$value); 
if(mysql_query($sql,$this->db)==false) 
{echo \"写数据到数据库时出错：\".$sql; 
exit(); 
} 
} 
function SelectRecord($database,$table) //返回记录数，结果在缓冲区中 
{mysql_select_db($database); 


if($this->num==0) 
$sql=sprintf(\"select * from %s\",$table); 
　else 
{ 
for($i=0;$i<$this->num;$i++) 
{if(is_string($this->value[$i])) 
$ls[$i]=\"\'\".$this->value[$i].\"\'\"; 

　else 
$ls[$i]=$this->value[$i]; 
$str[$i]=sprintf(\"%s=%s\",$this->name[$i],$ls[$i]); 
} 
$string=implode(\" and \",$str); 
$this->seekstr=$string; 
$sql=sprintf(\"select * from %s where %s\",$table,$string); 
} 
if(($rc=mysql_query($sql,$this->db))==false) 
{echo \"查询数据库时出错：\".$sql; 
exit(); 
} 
$i=0; 
while($this->buffer[$i]=mysql_fetch_array($rc)) 
{ 
$i++; 
} 
mysql_free_result($rc); 
return $i; 
} 
function UpdateRecord($database,$table,$limitstr) 
{mysql_select_db($database); 
if($this->num==0) 
exit(\"没有定义变量！\"); 
for($i=0;$i<$this->num;$i++) 
{if(is_string($this->value[$i])) 
$ls[$i]=\"\'\".$this->value[$i].\"\'\"; 
　else 
$ls[$i]=$this->value[$i]; 
$upstr[$i]=$this->name[$i].\"=\".$ls[$i]; 
} 


$str=implode(\",\",$upstr); 
$sql=sprintf(\"update %s set %s where %s\",$table,$str,$limitstr); 
if(mysql_query($sql,$this->db)==false) 
{echo \"修改数据时出错：\".$sql; 
exit(); 
} 
} 
function addtip($database,$table,$fileds,$limitstr=\"\") 
{//必须为整型字段　 
mysql_select_db($database); 
if($limitstr!=\"\") 
$sql=sprintf(\"update %s set %s=%s+1 where %s\",$table,$fileds,$fileds,$limitstr); 
　else 
$sql=sprintf(\"update %s set %s=%s+1\",$table,$fileds,$fileds); 
if(mysql_query($sql,$this->db)==false) 
{echo \"修改数据时出错：\".$sql; 
exit(); 
} 
} 
function unaddtip($database,$table,$fileds,$limitstr=\"\") 
{ 
mysql_select_db($database); 
if($limitstr!=\"\") 
$sql=sprintf(\"update %s set %s=%s-1 where %s\",$table,$fileds,$fileds,$limitstr); 
　else 
$sql=sprintf(\"update %s set %s=%s-1\",$table,$fileds,$fileds); 
if(mysql_query($sql,$this->db)==false) 
{echo \"修改数据时出错：\".$sql; 
exit(); 
} 
} 
function isempty($var,$china) 
{if(trim($var)==\"\") 
{ 
$reason=\"没有录入“\".$china.\"”!\"; 
exit($reason); 
} 
} 
function GetResult() 
{return $this->buffer; 
} 
function close() 
{ 
mysql_close($this->db); 
} 
} 
?>