mysql 数据库操作类

class dbstuff {
 var $querynum = 0;
 var $link;
    var $sqlid;
    var $record;
    var $dbcharset='utf-8';
    var $charset='utf-8';
 function connect($dbhost, $dbuser, $dbpw, $dbname = '', $pconnect = 0, $halt = true) {
  if($pconnect) {
   if(!$this->link = @mysql_pconnect($dbhost, $dbuser, $dbpw)) {
    $halt && $this->halt('can not connect to mysql server');
   }
  } else {
   if(!$this->link = @mysql_connect($dbhost, $dbuser, $dbpw, 1)) {
    $halt && $this->halt('can not connect to mysql server');
   }
  }

  if($this->version() > '4.1') {
   global $charset, $dbcharset;
   if(!$dbcharset && in_array(strtolower($charset), array('gbk', 'big5', 'utf-8'))) {
    $dbcharset = str_replace('-', '', $charset);
   }

   if($dbcharset) {
    @mysql_query("set character_set_connection=$dbcharset, character_set_results=$dbcharset, character_set_client=binary", $this->link);
   }

   if($this->version() > '5.0.1') {
    @mysql_query("set sql_mode=''", $this->link);
   }
  }

  if($dbname) {
   @mysql_select_db($dbname, $this->link);
  }

 }

 function select_db($dbname) {
  return mysql_select_db($dbname, $this->link);
 }

 function fetch_array($query, $result_type = mysql_assoc) {
  return mysql_fetch_array($query, $result_type);
 }

 function query($sql, $type = '') {
  global $debug, $discuz_starttime, $sqldebug, $sqlspenttimes;

  $func = $type == 'unbuffered' && @function_exists('mysql_unbuffered_query') ?
   'mysql_unbuffered_query' : 'mysql_query';
  if(!($query = $func($sql, $this->link))) {
   if(in_array($this->errno(), array(2006, 2013)) && substr($type, 0, 5) != 'retry') {
    $this->close();
    $this->connect($dbhost, $dbuser, $dbpw, $dbname, $pconnect);
    $this->query($sql, 'retry'.$type);
   } elseif($type != 'silent' && substr($type, 5) != 'silent') {
    $this->halt('mysql query error', $sql);
   }
  }

  $this->querynum++;
        $this->sqlid=$query;
  return $query;
 }

 function affected_rows() {
  return mysql_affected_rows($this->link);
 }

 function error() {
  return (($this->link) ? mysql_error($this->link) : mysql_error());
 }

 function errno() {
  return intval(($this->link) ? mysql_errno($this->link) : mysql_errno());
 }

 function result($query, $row) {
  $query = @mysql_result($query, $row);
  return $query;
 }

    function result_first($sql) {
  return $this->result($this->query($sql), 0);
 }

 function num_rows($query) {
  $query = mysql_num_rows($query);
  return $query;
 }

 function num_fields($query) {
  return mysql_num_fields($query);
 }

 function free_result($query) {
  return mysql_free_result($query);
 }

 function insert_id() {
  return ($id = mysql_insert_id($this->link)) >= 0 ? $id : $this->result($this->query("select last_insert_id()"), 0);
 }

 function fetch_row($query) {
  $query = mysql_fetch_row($query);
  return $query;
 }

 function fetch_fields($query) {
  return mysql_fetch_field($query);
 }

 function version() {
  return mysql_get_server_info($this->link);
 }

 function close() {
  return mysql_close($this->link);
 }

    function nr($sql_id="") {
        if(!$sql_id) $sql_id=$this->sqlid;
     return mysql_num_rows($sql_id);
    }

    function nf($sql_id="") {
        if(!$sql_id) $sql_id=$this->sqlid;
        return mysql_num_fields($sql_id);
    }

    function nextrecord($sql_id="") {
        if(!$sql_id) $sql_id=$this->sqlid;
        if($this->record=mysql_fetch_array($sql_id))  return $this->record;
        else return false;
    }

    function f($name) {
        if($this->record[$name]) return $this->record[$name];
        else return false;
    }

    function lock($tblname,$op="write") {
        if(mysql_query("lock tables ".$tblname." ".$op)) return true;
        else return false;
    }

    function unlock()
        {if(mysql_query("unlock tables")) return true; else return false;}

    function ar() {
        return @mysql_affected_rows($this->link);
    }

    function i_id() {
            return mysql_insert_id();
    }

 function halt($message = '', $sql = '') {
  define('cache_forbidden', true);
  include('db_mysql_error.inc.php');
 }
}

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