這篇文章主要介紹了一款簡(jiǎn)單實(shí)用的php操作mysql數(shù)據(jù)庫(kù)類(lèi),不但包含了php針對(duì)mysql數(shù)據(jù)庫(kù)的常見(jiàn)操作之外,還有針對(duì)危險(xiǎn)字符的過(guò)濾功能,非常具有實(shí)用價(jià)值,需要的朋友可以參考下

本文實(shí)例講述了一款簡(jiǎn)單實(shí)用的php操作mysql數(shù)據(jù)庫(kù)類(lèi)。分享給大家供大家參考。具體如下：

復(fù)制代碼代碼如下:

/* 

本款數(shù)據(jù)庫(kù)連接類(lèi)，他會(huì)自動(dòng)加載sql防注入功能，過(guò)濾一些敏感的sql查詢(xún)關(guān)鍵詞，同時(shí)還可以增加判斷字段 show table status的性質(zhì)與show table類(lèi) 獲取數(shù)據(jù)庫(kù)所有表名等。*/ 

@ini_set('mysql.trace_mode','off'); 

class mysql 

{

 public $dblink; 

 public $pconnect; 

 private $search = array('/union(s*(/*.**/)?s*)+select/i', '/load_file(s*(/*.**/)?s*)+(/i', '/into(s*(/*.**/)?s*)+outfile/i'); 

 private $replace = array('union &nbsp; select', 'load_file &nbsp; (', 'into &nbsp; outfile'); 

 private $rs; 

 function __construct($hostname,$username,$userpwd,$database,$pconnect=false,$charset='utf8') 

 { 

  define('allowed_htmltags', '<html><embed><title><meta><body><a><p><br><hr><h1><h2><h3><h4><h5><h6><font><u><i><b><strong><div><span><ol><ul><li><img><table><tr><td><map>');  

  $this->pconnect=$pconnect; 

  $this->dblink=$pconnect?mysql_pconnect($hostname,$username,$userpwd):mysql_connect($hostname,$username,$userpwd); 

  (!$this->dblink||!is_resource($this->dblink)) && fatal_error("connect to the database unsuccessfully!"); 

  @mysql_unbuffered_query("set names {$charset}"); 

  if($this->version()>'5.0.1') 

  { 

   @mysql_unbuffered_query("set sql_mode = ''"); 

  } 

  @mysql_select_db($database) or fatal_error("can not select table!"); 

  return $this->dblink; 

 } 

 function query($sql,$unbuffered=false) 

 { 

  //echo $sql.'<br>'; 

  $this->rs=$unbuffered?mysql_unbuffered_query($sql,$this->dblink):mysql_query($sql,$this->dblink); 

  //(!$this->rs||!is_resource($this->rs)) && fatal_error("execute the query unsuccessfully! error:".mysql_error()); 

  if(!$this->rs)fatal_error('在執(zhí)行sql語(yǔ)句 '.$sql.' 時(shí)發(fā)生以下錯(cuò)誤:'.mysql_error()); 

  return $this->rs; 

 } 

 function fetch_one($sql) 

 { 

  $this->rs=$this->query($sql); 

  return dircms_strips教程lashes($this->filter_pass(mysql_fetch_array($this->rs,mysql_assoc))); 

 } 

 function get_maxfield($filed='id',$table) // 獲取$table表中$filed字段的最大值 

 { 

  $r=$this->fetch_one("select {$table}.{$filed} from `{$table}` order by `{$table}`.`{$filed}` desc limit 0,1"); 

  return $r[$filed]; 

 } 

 function fetch_all($sql) 

 { 

  $this->rs=$this->query($sql); 

  $result=array(); 

  while($rows=mysql_fetch_array($this->rs,mysql_assoc)) 

  { 

   $result[]=$rows; 

  } 

  mysql_free_result($this->rs); 

  return dircms_stripslashes($this->filter_pass($result));  

 } 

 function fetch_all_withkey($sql,$key='id') 

 { 

  $this->rs=$this->query($sql); 

  $result=array(); 

  while($rows=mysql_fetch_array($this->rs,mysql_assoc)) 

  { 

   $result[$rows[$key]]=$rows; 

  } 

  mysql_free_result($this->rs); 

  return dircms_stripslashes($this->filter_pass($result));  

 } 

 function last_insert_id() 

 { 

  if(($insertid=mysql_insert_id($this->dblink))>0)return $insertid; 

  else //如果 auto_increment 的列的類(lèi)型是 bigint，則 mysql_insert_id() 返回的值將不正確. 

  { 

   $result=$this->fetch_one('select last_insert_id() as insertid'); 

   return $result['insertid']; 

  } 

 } 

 function insert($tbname,$varray,$replace=false) 

 { 

  $varray=$this->escape($varray); 

  $tb_fields=$this->get_fields($tbname); // 升級(jí)一下，增加判斷字段是否存在 

  foreach($varray as $key => $value) 

  { 

   if(in_array($key,$tb_fields)) 

   { 

    $fileds[]='`'.$key.'`'; 

    $values[]=is_string($value)?'''.$value.''':$value; 

   } 

  } 

  if($fileds) 

  { 

   $fileds=implode(',',$fileds); 

   $fileds=str_replace(''','`',$fileds); 

   $values=implode(',',$values); 

   $sql=$replace?"replace into {$tbname}({$fileds}) values ({$values})":"insert into {$tbname}({$fileds}) values ({$values})"; 

   $this->query($sql,true); 

   return $this->last_insert_id(); 

  } 

  else return false; 

 } 

 function update($tbname, $array, $where = '') 

 { 

  $array=$this->escape($array); 

  if($where) 

  { 

   $tb_fields=$this->get_fields($tbname); // 增加判斷字段是否存在 

   $sql = ''; 

   foreach($array as $k=>$v) 

   { 

    if(in_array($k,$tb_fields)) 

    { 

     $k=str_replace(''','',$k); 

     $sql .= ", `$k`='$v'"; 

    } 

   } 

   $sql = substr($sql, 1); 

   if($sql)$sql = "update `$tbname` set $sql where $where"; 

   else return true; 

  } 

  else 

  { 

   $sql = "replace into `$tbname`(`".implode('`,`', array_keys($array))."`) values('".implode("','", $array)."')"; 

  } 

  return $this->query($sql,true); 

 } 

 function mysql_delete($tbname,$idarray,$filedname='id') 

 { 

  $idwhere=is_array($idarray)?implode(',',$idarray):intval($idarray); 

  $where=is_array($idarray)?"{$tbname}.{$filedname} in ({$idwhere})":" {$tbname}.{$filedname}={$idwhere}"; 

  return $this->query("delete from {$tbname} where {$where}",true); 

 } 

 function get_fields($table) 

 { 

  $fields=array(); 

  $result=$this->fetch_all("show columns from `{$table}`"); 

  foreach($result as $val) 

  { 

   $fields[]=$val['field']; 

  } 

  return $fields; 

 } 

 function get_table_status($database) 

 { 

  $status=array(); 

  $r=$this->fetch_all("show table status from `".$database."`"); /////// show table status的性質(zhì)與show table類(lèi)似，不過(guò)，可以提供每個(gè)表的大量信息。 

  foreach($r as $v) 

  { 

   $status[]=$v; 

  } 

  return $status; 

 } 

 function get_one_table_status($table) 

 { 

  return $this->fetch_one("show table status like '$table'"); 

 } 

 function create_fields($tbname,$fieldname,$size=0,$type='varchar') // 2010-5-14 修正一下 

 {   

  if($size) 

  { 

   $size=strtoupper($type)=='varchar'?$size:8; 

   $this->query("alter table `{$tbname}` add `$fieldname` {$type}( {$size} )  not null",true); 

  } 

  else $this->query("alter table `{$tbname}` add `$fieldname` mediumtext  not null",true); 

  return true; 

 } 

 function get_tables() //獲取所有表表名 

 { 

  $tables=array(); 

  $r=$this->fetch_all("show tables"); 

  foreach($r as $v) 

  { 

   foreach($v as $v_) 

   { 

    $tables[]=$v_; 

   } 

  } 

  return $tables; 

 } 

 function create_model_table($tbname) //創(chuàng)建一個(gè)內(nèi)容模型表（start：初始只有字段contentid int(20)，用于內(nèi)容表，/////////////////////// update：2010-5-20     默認(rèn)加入`content` mediumtext not null,字段） 

 { 

  if(in_array($tbname,$this->get_tables())) return false;  ///////////////////// 當(dāng)表名已經(jīng)存在時(shí)，返回 false 

  if($this->query("create table `{$tbname}` ( 

`contentid` mediumint(8) not null , 

`content` mediumtext not null, 

key ( `contentid` )  

) engine = myisam default charset=utf8",true))return true;   ////////////////////  成功則返回 true 

  return false; //////////////失敗返回 false 

 } 

 function create_table($tbname) //創(chuàng)建一個(gè)會(huì)員模型空表（初始只有字段userid int(20)，用于會(huì)員表，2010-4-26） 

 { 

  if(in_array($tbname,$this->get_tables())) return false; 

  if($this->query("create table `{$tbname}` ( 

`userid` mediumint(8) not null , 

key ( `userid` )  

) engine = myisam default charset=utf8",true))return true; 

  return false; 

 } 

 function escape($str) // 過(guò)濾危險(xiǎn)字符 

 { 

  if(!is_array($str)) return str_replace(array('n', 'r'), array(chr(10), chr(13)),mysql_real_escape_string(preg_replace($this->search,$this->replace, $str), $this->dblink)); 

  foreach($str as $key=>$val) $str[$key] = $this->escape($val); 

  return $str; 

 } 

 function filter_pass($string, $allowedtags = '', $disabledattributes = array('onabort', 'onactivate', 'onafterprint', 'onafterupdate', 'onbeforeactivate', 'onbeforecopy', 'onbeforecut', 'onbeforedeactivate', 'onbeforeeditfocus', 'onbeforepaste', 'onbeforeprint', 'onbeforeunload', 'onbeforeupdate', 'onblur', 'onbounce', 'oncellchange', 'onchange', 'onclick', 'oncontextmenu', 'oncontrolselect', 'oncopy', 'oncut', 'ondataavaible', 'ondatasetchanged', 'ondatasetcomplete', 'ondblclick', 'ondeactivate', 'ondrag', 'ondragdrop', 'ondragend', 'ondragenter', 'ondragleave', 'ondragover', 'ondragstart', 'ondrop', 'onerror', 'onerrorupdate', 'onfilterupdate', 'onfinish', 'onfocus', 'onfocusin', 'onfocusout', 'onhelp', 'onkeydown', 'onkeypress', 'onkeyup', 'onlayoutcomplete', 'onload', 'onlosecapture', 'onmousedown', 'onmouseenter', 'onmouseleave', 'onmousemove', 'onmoveout', 'onmouseo教程ver', 'onmouseup', 'onmousewheel', 'onmove', 'onmoveend', 'onmovestart', 'onpaste', 'onpropertychange', 'onreadystatechange', 'onreset', 'onresize', 'onresizeend', 'onresizestart', 'onrowexit', 'onrowsdelete', 'onrowsinserted', 'onscroll', 'onselect', 'onselectionchange', 'onselectstart', 'onstart', 'onstop', 'onsubmit', 'onunload')) 

 { 

  if(is_array($string)) 

  { 

   foreach($string as $key => $val) $string[$key] = $this->filter_pass($val, allowed_htmltags); 

  } 

  else 

  { 

   $string = preg_replace('/s('.implode('|', $disabledattributes).').*?([s>])/', '', preg_replace('/<(.*?)>/ie', "'<'.preg_replace(array('/網(wǎng)頁(yè)特效:[^"']*/i', '/(".implode('|', $disabledattributes).")[ ]*=[ ]*["'][^"']*["']/i', '/s+/'), array('', '', ' '), stripslashes('')) . '>'", strip_tags($string, $allowedtags))); 

  } 

  return $string; 

 } 

 function drop_table($tbname) 

 { 

  return $this->query("drop table if exists `{$tbname}`",true); 

 } 

 function version() 

 { 

  return mysql_get_server_info($this->dblink); 

 } 

}