一个MYSQL操作类_php技巧

代码如下:
class DB{
var $host_addr = "localhost";
var $host_user = "root";
var $host_psw = "123";
var $db_name = "test";

var $link_id;
var $query_id;
var $numRow;

function DB(){
$this->link_id = @mysql_connect($this->host_addr,$this->host_user,$this->host_psw);
if($this->link_id){
@mysql_select_db($this->db_name,$this->link_id) or $this->halt("数据库连接失败！");
}else{
$this->halt("连接服务器失败！");
return false;
}
return $this->link_id;
}
function query($sql){
$this->query_id = @mysql_query($sql,$this->link_id);
if($this->query_id){
return $this->query_id;
}else{
$this->halt("SQL Error::");
return false;
}
}
function numRow(){
return $this->numRow = @mysql_num_rows($this->query_id);
}
function close(){
return @mysql_close($this->link_id);
}
function halt($msg){
echo "".$msg."";
}

}
?>