query($sql,$database);
 query_first($sql,$database);
 fetch_array($sql,$database);
 count_records($table,$index,$where,$database);)//为得到一个表记录的数目，$table为表名，$index为key，$where为条件，$dbbase为数据库，后两个可以不选
 */

 class db_Mysql
 {
  
  var $usepconnect;
  var $dbSever;
  var $dbDatabase;
  var $dbbase;
  var $dbUser;
  var $dbPwd;
  var $dbLink;
  var $query_id;// 执行query命令的指针
  var $num_rows;// 返回的条目数
  var $insert_id;// 传回最后一次使用 INSERT 指令的 ID
  var $affected_rows;// 传回query命令所影响的列数目
                  // INSERT、UPDATE 或 DELETE 所影响的列 (row) 数目。
                  // delete 如果不带where，那么则返回0
  function dbconnect($dbbase,$usepconnect)
  {
   //global $usepconnect;
   if($usepconnect==1)
    $this->dbLink=@mysql_pconnect($this->dbServer,$this->dbUser,$this->dbPwd);//long connect
   else
    $this->dbLink=@mysql_connect($this->dbServer,$this->dbUser,$this->dbPwd);//short connect
   //$this->dbhalt($this->dbbase);
   if(!$this->dbLink) $this->dbhalt("exsiting error when connecting!");
   if($this->dbbase=="") $this->dbbase=$this->dbDatabase;
   if(!@mysql_select_db($this->dbbase,$this->dbLink))
    $this->dbhalt("can't use this database,please check database!");
  } // end func() connect database
  //change database
  function dbchange_db($dbbase){
   $this->dbconnect($dbbase);
  
  }
  function dbquery($sql){
   //if($dbbase!="") $this->dbchange_db($dbbase);
   $this->query_id=mysql_query($sql);
   //print($query_id);
   if(!$this->query_id) $this->dbhalt("wrong sql sentence!".$sql);
   return $this->query_id;
  }
  function dbquery_first($sql,$dbbase){
   $query_id=dbquery($sql,$dbbase);
   $returnarray=mysql_fetch_array($query_id);
   $this->num_rows=mysql_num_rows($query_id);
   $this->dbfree_result($query_id);
   return $returnarray;
  }
  function dbhalt($errmsg){
   $msg="

database is wrong!