一款实用的php mysql数据库连接类_PHP教程

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Lepaskan: 2016-07-13 17:09:31
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php教程 mysql教程数据库教程连接类
 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>



    • 一款实用的php mysql数据库连接类_PHP教程
      ');
        $this->pconnect=$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.'
      ';
        $this->rs=$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(!$this->rs)fatal_error('在执行sql语句 '.$sql.' 时发生以下错误:'.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) // 获取$table表中$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 的列的类型是 bigint,则 mysql_insert_id() 返回的值将不正确.
        {
         $result=$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); // mb.bKjia.c0m 升级一下,增加判断字段是否存在
        
        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); // www.bKjia.c0m,增加判断字段是否存在
         
         $sql = '';
         foreach($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 `".$database."`"); /////// show table status的性质与show table类似,不过,可以提供每个表的大量信息。
        foreach($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() //获取所有表表名
       {
        $tables=array();
        $r=$this->fetch_all("show tables");
        foreach($r as $v)
        {
         foreach($v as $v_)
         {
          $tables[]=$v_;
         }
        }
        return $tables;
       }

       function create_model_table($tbname) //创建一个内容模型表(start:初始只有字段contentid int(20),用于内容表,/////////////////////// update:2010-5-20     默认加入`content` mediumtext not null,字段)
       {
        if(in_array($tbname,$this->get_tables())) return false;  ///////////////////// 当表名已经存在时,返回 false
        if($this->query("create table `{$tbname}` (
      `contentid` mediumint(8) not null ,
      `content` mediumtext not null,
      key ( `contentid` )
      ) engine = myisam default charset=utf8",true))return true;   ////////////////////  成功则返回 true
        return false; //////////////失败返回 false
       }

       function create_table($tbname) //创建一个会员模型空表(初始只有字段userid int(20),用于会员表,2010-4-26)
       {
        if(in_array($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($str) // 过滤危险字符
       {
        if(!is_array($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('|', $disabledattributes).').*?([s>])/', '2', preg_replace('//ie', "''", strip_tags($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);
       }
      }

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