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);
}
}
?>