一款实用的php mysql数据库连接类

作者：袖梨 2022-06-24

 本款数据库连接类，他会自动加载sql防注入功能，过滤一些敏感的sql查询关键词，同时还可以增加判断字段 show table status的性质与show table类 获取数据库所有表名等。*/
@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   select', 'load_file   (', 'into   outfile');
 private $rs;

 function __construct($hostname,$username,$userpwd,$database,$pconnect=false,$charset='utf8')
 {
  define('allowed_htmltags', '<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>'); <br />   $this->pconnect=$pconnect;<br />   $this->dblink=$pconnect?mysql_pconnect($hostname,$username,$userpwd):mysql_connect($hostname,$username,$userpwd);<br />   (!$this->dblink||!is_resource($this->dblink)) && fatal_error("connect to the database unsuccessfully!");<br />   @mysql_unbuffered_query("set names {$charset}");<br />   if($this->version()>'5.0.1')<br />   {<br />    @mysql_unbuffered_query("set sql_mode = ''");<br />   }<br />   @mysql_select_db($database) or fatal_error("can not select table!");<br />   return $this->dblink;<br />  }</p> <p> function query($sql,$unbuffered=false)<br />  {<br />   //echo $sql.'<br>';<br />   $this->rs=$unbuffered?mysql_unbuffered_query($sql,$this->dblink):mysql_query($sql,$this->dblink);<br />   //(!$this->rs||!is_resource($this->rs)) && fatal_error("execute the query unsuccessfully! error:".mysql_error());<br />   if(!$this->rs)fatal_error('在执行sql语句 '.$sql.' 时发生以下错误:'.mysql_error());<br />   return $this->rs;<br />  }</p> <p> function fetch_one($sql)<br />  {<br />   $this->rs=$this->query($sql);<br />   return dircms_stri<a target="_blank" href="/fw/photo.html">ps教程</a>lashes($this->filter_pass(mysql_fetch_array($this->rs,mysql_assoc)));<br />  }</p> <p> function get_maxfield($filed='id',$table) // 获取$table表中$filed字段的最大值<br />  {<br />   $r=$this->fetch_one("select {$table}.{$filed} from `{$table}` order by `{$table}`.`{$filed}` desc limit 0,1");<br />   return $r[$filed];<br />  }</p> <p> function fetch_all($sql)<br />  {<br />   $this->rs=$this->query($sql);<br />   $result=array();<br />   while($rows=mysql_fetch_array($this->rs,mysql_assoc))<br />   {<br />    $result[]=$rows;<br />   }<br />   <br />   mysql_free_result($this->rs);<br />   return dircms_stripslashes($this->filter_pass($result)); <br />  }</p> <p> function fetch_all_withkey($sql,$key='id')<br />  {<br />   $this->rs=$this->query($sql);<br />   $result=array();<br />   while($rows=mysql_fetch_array($this->rs,mysql_assoc))<br />   {<br />    $result[$rows[$key]]=$rows;<br />   }<br />   <br />   mysql_free_result($this->rs);<br />   return dircms_stripslashes($this->filter_pass($result)); <br />  }</p> <p> function last_insert_id()<br />  {<br />   if(($insertid=mysql_insert_id($this->dblink))>0)return $insertid;<br />   else //如果 auto_increment 的列的类型是 bigint，则 mysql_insert_id() 返回的值将不正确.<br />   {<br />    $result=$this->fetch_one('select last_insert_id() as insertid');<br />    return $result['insertid'];<br />   }<br />  }</p> <p> function insert($tbname,$varray,$replace=false)<br />  {<br />   $varray=$this->escape($varray);<br />   $tb_fields=$this->get_fields($tbname); // mb.111com.net 升级一下，增加判断字段是否存在<br />   <br />   foreach($varray as $key => $value)<br />   {<br />    if(in_array($key,$tb_fields))<br />    {<br />     $fileds[]='`'.$key.'`';<br />     $values[]=is_string($value)?'''.$value.''':$value;<br />    }<br />   }</p> <p>  if($fileds)<br />   {<br />    $fileds=implode(',',$fileds);<br />    $fileds=str_replace(''','`',$fileds);<br />    $values=implode(',',$values);<br />    $sql=$replace?"replace into {$tbname}({$fileds}) values ({$values})":"insert into {$tbname}({$fileds}) values ({$values})";<br />    $this->query($sql,true);<br />    return $this->last_insert_id();<br />   }<br />   else return false;<br />  }</p> <p> function update($tbname, $array, $where = '')<br />  {<br />   $array=$this->escape($array);<br />   if($where)<br />   {<br />    $tb_fields=$this->get_fields($tbname); // www.111com.net，增加判断字段是否存在<br />    <br />    $sql = '';<br />    foreach($array as $k=>$v)<br />    {<br />     if(in_array($k,$tb_fields))<br />     {<br />      $k=str_replace(''','',$k);<br />      $sql .= ", `$k`='$v'";<br />     }<br />    }<br />    $sql = substr($sql, 1);<br />    <br />    if($sql)$sql = "update `$tbname` set $sql where $where";<br />    else return true;<br />   }<br />   else<br />   {<br />    $sql = "replace into `$tbname`(`".implode('`,`', array_keys($array))."`) values('".implode("','", $array)."')";<br />   }<br />   return $this->query($sql,true);<br />  }<br />  <br />  function mysql_delete($tbname,$idarray,$filedname='id')<br />  {<br />   $idwhere=is_array($idarray)?implode(',',$idarray):intval($idarray);<br />   $where=is_array($idarray)?"{$tbname}.{$filedname} in ({$idwhere})":" {$tbname}.{$filedname}={$idwhere}";</p> <p>  return $this->query("delete from {$tbname} where {$where}",true);<br />  }</p> <p> function get_fields($table)<br />  {<br />   $fields=array();<br />   $result=$this->fetch_all("show columns from `{$table}`");<br />   foreach($result as $val)<br />   {<br />    $fields[]=$val['field'];<br />   }<br />   return $fields;<br />  }</p> <p> function get_table_status($database)<br />  {<br />   $status=array();<br />   $r=$this->fetch_all("show table status from `".$database."`"); /////// show table status的性质与show table类似，不过，可以提供每个表的大量信息。<br />   foreach($r as $v)<br />   {<br />    $status[]=$v;<br />   }<br />   return $status;<br />  }</p> <p> function get_one_table_status($table)<br />  {<br />   return $this->fetch_one("show table status like '$table'");<br />  }</p> <p> function create_fields($tbname,$fieldname,$size=0,$type='varchar') // 2010-5-14 修正一下<br />  {  <br />   if($size)<br />   {<br />    $size=strtoupper($type)=='varchar'?$size:8;<br />    $this->query("alter table `{$tbname}` add `$fieldname` {$type}( {$size} )  not null",true);<br />   }<br />   else $this->query("alter table `{$tbname}` add `$fieldname` mediumtext  not null",true);<br />   return true;<br />  }</p> <p> function get_tables() //获取所有表表名<br />  {<br />   $tables=array();<br />   $r=$this->fetch_all("show tables");<br />   foreach($r as $v)<br />   {<br />    foreach($v as $v_)<br />    {<br />     $tables[]=$v_;<br />    }<br />   }<br />   return $tables;<br />  }</p> <p> function create_model_table($tbname) //创建一个内容模型表（start：初始只有字段contentid int(20)，用于内容表，/////////////////////// update：2010-5-20     默认加入`content` mediumtext not null,字段）<br />  {<br />   if(in_array($tbname,$this->get_tables())) return false;  ///////////////////// 当表名已经存在时，返回 false<br />   if($this->query("create table `{$tbname}` (<br /> `contentid` mediumint(8) not null ,<br /> `content` mediumtext not null,<br /> key ( `contentid` ) <br /> ) engine = myisam default charset=utf8",true))return true;   ////////////////////  成功则返回 true<br />   return false; //////////////失败返回 false<br />  }</p> <p> function create_table($tbname) //创建一个会员模型空表（初始只有字段userid int(20)，用于会员表，2010-4-26）<br />  {<br />   if(in_array($tbname,$this->get_tables())) return false;<br />   if($this->query("create table `{$tbname}` (<br /> `userid` mediumint(8) not null ,<br /> key ( `userid` ) <br /> ) engine = myisam default charset=utf8",true))return true;<br />   return false;<br />  }</p> <p> function escape($str) // 过滤危险字符<br />  {<br />   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), $this->dblink));<br />   foreach($str as $key=>$val) $str[$key] = $this->escape($val);<br />   return $str;<br />  }</p> <p> function filter_pass($string, $allowedtags = '', $disabledattributes = array('onabort', 'onactivate', 'onafterprint', 'onafterupdate', 'onbeforeactivate', 'onbeforecopy', 'onbeforecut', 'onbeforedeactivate', 'onbeforeeditfocus', 'onbeforepaste', 'onbeforeprint', 'onbeforeunload', 'onbeforeupdate', 'onblur', 'onbounce', 'oncellchange', 'onchange', 'onclick', 'oncontextmenu', 'oncontrolselect', 'oncopy', 'oncut', 'ondataavaible', 'ondatasetchanged', 'ondatasetcomplete', 'ondblclick', 'ondeactivate', 'ondrag', 'ondragdrop', 'ondragend', 'ondragenter', 'ondragleave', 'ondragover', 'ondragstart', 'ondrop', 'onerror', 'onerrorupdate', 'onfilterupdate', 'onfinish', 'onfocus', 'onfocusin', 'onfocusout', 'onhelp', 'onkeydown', 'onkeypress', 'onkeyup', 'onlayoutcomplete', 'onload', 'onlosecapture', 'onmousedown', 'onmouseenter', 'onmouseleave', 'onmousemove', 'onmoveout', 'onmou<a target="_blank" href="/seo/seo.html">seo教程</a>ver', 'onmouseup', 'onmousewheel', 'onmove', 'onmoveend', 'onmovestart', 'onpaste', 'onpropertychange', 'onreadystatechange', 'onreset', 'onresize', 'onresizeend', 'onresizestart', 'onrowexit', 'onrowsdelete', 'onrowsinserted', 'onscroll', 'onselect', 'onselectionchange', 'onselectstart', 'onstart', 'onstop', 'onsubmit', 'onunload'))<br />  {<br />   if(is_array($string))<br />   {<br />    foreach($string as $key => $val) $string[$key] = $this->filter_pass($val, allowed_htmltags);<br />   }<br />   else<br />   {<br />    $string = preg_replace('/s('.implode('|', $disabledattributes).').*?([s>])/', '', preg_replace('/<(.*?)>/ie', "'<'.preg_replace(array('/<a target="_blank" href="/js_a/js.html">网页特效</a>:[^"']*/i', '/(".implode('|', $disabledattributes).")[ ]*=[ ]*["'][^"']*["']/i', '/s+/'), array('', '', ' '), stripslashes('')) . '>'", strip_tags($string, $allowedtags)));<br />   }<br />   return $string;<br />  }</p> <p> function drop_table($tbname)<br />  {<br />   return $this->query("drop table if exists `{$tbname}`",true);<br />  }</p> <p> function version()<br />  {<br />   return mysql_get_server_info($this->dblink);<br />  }<br /> }</p></td> </tr> </table> </div> </div> </section> <section class="wrap-box"> <div class="g-tit"> <h2>相关文章</h2> </div> <ul class="s-list nobord notop"> <li> <a href="/art-422360.htm" class="s-card"> <div class="s-card-l"> <p class="tit">原神欧洛伦怎么培养 原神欧洛伦培养攻略介绍</p> <div class="info"> <span class="person">游戏攻略</span> <span class="time">2024-11-22</span> </div> </div> <div class="s-card-pic"> <img src="/images/lazy.gif" data-src="/uploads/20241122/logo_674017613ef5b1.jpeg" alt="原神欧洛伦怎么培养 原神欧洛伦培养攻略介绍" /> </div> </a> </li> <li> <a href="/art-422359.htm" class="s-card"> <div class="s-card-l"> <p class="tit">炉石传说跳费大哥德卡组怎么样 炉石传说跳费大哥德卡组推荐介绍</p> <div class="info"> <span 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