mysql 数据库操作类_PHP教程

mysql 数据库操作类 本款是利用php mysql 数据库操作类函数，他可以删除，修改，增加，备份等对数据库的操作哦，同时还支持两种数据库连接方式 哦，以前数据库编码等的设置。

mysql教程 数据库教程操作类
 本款是利用php教程 mysql 数据库操作类函数，他可以删除，修改，增加，备份等对数据库的操作哦，同时还支持两种数据库连接方式 哦，以前数据库编码等的设置。
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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');  } } ?>