mysql
/*************************************
    mysql连接类实现 -write by 三千
 **************************************/
 /*
 使用方法(可以执行一般mysql命令,insert, delete select  update)
 在文件前,需要加载方法
 require(mysql.class.php)
 $db=new dbmysql; 加载类
 $db->dbserver=localhost;
 $db->dbuser=root;
 $db->dbpwd=;
 $db->dbdatabase=;
 $db->dbconnect();  query($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(dbbase,$this->dblink>!@mysql_select_db($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!
;
   $msg=$errmsg;
   echo$msg;
   die();
  }
  function dbfetch_array($sql,$dbbase,$type){
   $query_id=$this->dbquery($sql,$dbbase);
   $this->numrows=mysql_num_rows($query_id);
   for($i=0;$inumrows;$i++){
    if($type==0)
     $array[$i]=mysql_fetch_array($query_id);
    else
     $array[$i]=mysql_fetch_array($query_id);
   }
   $this->dbfree_result($query_id);
   return $array;
  }
  function dbdelete($sql,$dbdase){
   $query_id=$this->dbquery($sql,$dbbase);
   $this->affected_rows=mysql_affected_rows($this->dblink);
   $this->free_reuslt($query_id);
  }
  function dbinsert($sql,$dbbase){
   $query_id=$this->dbquery($sql,$dbbase);
   $this->insert_id=mysql_insert_id($this->dblink);
   $this->affected_rows=mysql_affected_rows($this->dblink);
   $this->free_reuslt($query_id);
  }
  function dbupdate($sql,$dbbase){
   $query_id=$this->dbquery($sql,$dbbase);
   $this->insert_id=mysql_insert_id($this->dblink);
   $this->affected_rows=mysql_affected_rows($this->dblink);
   $this->free_reuslt($query_id);
  }
  function dbcount_records($table,$index=id,$where=,$dbbase){
   if($dbbase!=)$this->dbchangedb($dbbase);
   $result=@mysql_query(select count(.$index.) as 'num' form.$table.where.$where,$this->dblink);
   if(!$result) $this->dbhalt(wrong sql sentence.$sql);
    $num=@mysql_result($result,0,num);
   return $num;
  }
  function dbgetnum($result){
   $num=@mysql_numrows($result);
   return $num;
  }
  function dbfree_result($result_id){
   @mysql_free_result($query_id);
  }
  function dbclose(){
   mysql_close($this->dblink);
  }
 } // end class
 $db=new db_mysql;
 $db->dbserver=localhost;
 $db->dbuser=root;
 $db->dbpwd=;
 $db->dbbase=test;
?>